Anti-Jamming Schedules for Wireless Data Broadcast Systems
|
|
- Dulcie Ramsey
- 6 years ago
- Views:
Transcription
1 Ani-Jamming Schedules for Wireless Daa Broadcas Sysems Paolo Codenoi 1, Alexander Sprinson, and Jehoshua Bruck Absrac Modern sociey is heavily dependen on wireless neworks for providing voice and daa communicaions. Wireless daa broadcas has recenly emerged as an aracive way o disseminae dynamic daa o a large number of cliens. In daa broadcas sysems, he server proacively ransmis he informaion on a downlink channel; he cliens access he daa by lisening o he channel. Wireless daa broadcas sysems can serve a large number of heerogeneous cliens, minimizing power consumpion as well as proecing he privacy of he cliens locaions. The availabiliy and relaively low cos of anennas resuled in a number of poenial hreas o he inegriy of he wireless infrasrucure. In paricular, he daa broadcas sysems are vulnerable o jamming, i.e., he use of acive signals o preven daa broadcas. The goal of jammers is o cause disrupion, resuling in long waiing imes and excessive power consumpion. In his paper we invesigae efficien schedules for wireless daa broadcas ha perform well in he presence of a jammer. We show ha he waiing ime of clien can be reduced by adding redundancy o he schedule and esablish upper and lower bounds on he achievable minimum waiing ime under differen requiremens on he saleness of he ransmied daa. I. INTRODUCTION Modern sociey has become heavily dependen on wireless neworks o deliver informaion o diverse users. The emerging wireless infrasrucure provides opporuniies for building efficien daa disribuion sysems ha allow users o access he laes daa, such as sock quoes and raffic condiions, a any ime, wheher hey are a home, a heir office, or raveling. Wireless daa disribuion sysems also have a broad range of applicaions in miliary neworks, such as ransmiing up-odae bale informaion o acical commanders in he field. Due o heir open and ubiquious naure, wireless informaion sysems are exremely vulnerable o aack and misuse. Wireless sysems can be aacked in various ways, depending on he objecives and capabiliies of an adversary. Due o high availabiliy and relaively low cos of powerful anennas, jamming, i.e., he use of acive signals o preven daa disribuion, has emerged as an aracive way of aack. Jamming is a common mehod of aack in miliary neworks, where he adversary has he capabiliy and he moivaion o disrup communicaion links. One common characerisic of wireless infrasrucure is an asymmery beween he downlink and uplink channels. Typically, he downlink channel has higher bandwidh and more energy resources han he uplink channel. This inrinsic asymmery of wireless sysems impacs he way informaion is delivered o cliens. In paricular, he sandard clien-server paradigm, in which he daa ransfer is iniiaed by cliens, is no adequae for wireless sysems. Wireless daa broadcas [1] [] has recenly emerged as an aracive way o disseminae daa o a large number of cliens. In daa broadcas sysems, he server proacively ransmis he informaion on he downlink channel and he cliens access daa by lisening o he channel. This approach enables he sysem o serve a large number of heerogeneous cliens, minimizing cliens power consumpion as well as proecing he privacy of he cliens locaions. Figure 1 depics a ypical daa broadcas sysem. The sysem includes he following componens: he server (scheduler), he broadcas channel, he informaion source, and he wireless users. The server periodically accesses he informaion source, rerieves he mos recen daa, encapsulaes i ino packes and sends he packes over he broadcas channel. Each ransmied packe carries he mos recen updae on he sae of he informaion source. There are wo key performance characerisics of a wireless daa disribuion sysem. The firs characerisic is he waiing ime, i.e., he amoun of ime spen by he clien waiing for an updae. Waiing ime is an imporan parameer, as imely informaion delivery is essenial for many pracical applicaions. In addiion, i is closely relaed o he amoun of power spen by he clien o obain he informaion. The second characerisic is saleness, i.e., he amoun of ime ha passes from he momen he updae is generaed, unil i is delivered o he clien. The saleness of he schedule usually depends on he amoun of redundancy used by he sysem, as informaion becomes less and less relevan wih ime. Jamming Aacks: The goal of he jammer is o disrup he normal operaion of he broadcas sysem by sending acive signals over he channel ha inerfere wih he signal sen by he server (see Figure 1). Jamming signals may resul in long waiing ime and excessive power consumpion of Source Jammer Server 1 Deparmen of Compuer Science, Universiy of Chicago, Chicago, Illinois, USA. paoloc@uchicago.edu Deparmen of Elecrical and Compuer Engineering, Texas A&M Universiy, Texas, USA. spalex@ece.amu.edu Parallel and Disribued Compuing Group, California Insiue of Technology, Pasadena, California, USA. bruck@paradise.calech.edu Fig. 1. A ypical daa broadcas sysem.
2 he cliens. The radiional defences agains jamming include spread specrum echniques such as direc sequence and frequency hopping [], [5]. While hese echniques consiue an imporan ool for combaing jamming, an addiional proecion is required a he packe level due o he following reasons. Firs, he pseudo-random noise code or frequency hopping sequence may be known o he adversary. Second, even if no informaion abou he spread-specrum proocol is available o he adversary, i can sill desroy a small porion of each ransmied packe by sending a srong jamming signal of shor duraion. If no oher proecion mechanism is used a he packe-level, he few desroyed bis will resul in dropping of he enire packe. In his paper we invesigae efficien ani-jamming schedules for daa broadcas. In our schedules, each updae is encoded by an error-correcing code, such as a Reed-Solomon code, which allows he schedule o minimize boh waiing ime and saleness. As power supply is he mos imporan consrain for pracical jammers, we focus on jammers ha have cerain resricions on he duraion of jamming pulses. To he bes of our knowledge, his is he firs sudy ha invesigaes anijamming schedules for wireless daa disribuion sysems. Relaed Work: The design of opimal broadcas schedules araced a large body of research (see [6] [9] and references herein). Daa broadcas over lossy communicaion channels was sudied in [10]. This work proposes efficien coding soluions ha reduce performance degradaion due o packe loss. Sudies [11], [1] focused on he design of universal schedules ha guaranee low waiing ime for any user, regardless of he access paern. These sudies show ha a good universal schedule has o combine boh encoding and randomizaion echniques. II. MODEL A. Schedules As menioned in he inroducion, he goal of he sysem is o enable each clien o access he mos updaed informaion is a imely manner. To ha end, he server periodically ransmis updaes, each updae capures he mos recen sae of he informaion source. We assume ha each updae includes exacly k informaion symbols and he ransmission of one updae wihou encoding requires one ime uni. Each updae is encoded ino a packe by using a Maximal Disance Separable (MDS) code, e.g., a Reed-Solomon code [1]. The encoding ensures ha any k symbols of he packe are sufficien in order o reconsruc he updae. We enumerae updaes according o he ime of heir creaion. Definiion 1 (Schedule S): A schedule is a sequence {r 1, r,... }, r i 1, such ha r i 1 is he number of ime unis allocaed for he ransmission of updae i. Noe ha according o he above definiion each packe includes r i k k symbols. A schedule S = {r 1, r,... } can also be defined by is ransmission sequence { 1,,... }, where i represens he saring ime of he ransmission of packe i, i.e., 1 = 0 and i = i 1 j=1 r j for i > 1. For example, consider he schedules depiced in Figures (a) and (b). In he firs schedule, each packe is allocaed r ime unis, hence he ransmission sequence of he schedule is 0, r, r,.... The second schedule ransmis packes of varying lengh. 0 Message Message Message 0 r r r 0 Fig.. r1 (a) Message Message Message r (b) h1 l1 h l h l h l (c) Message Message Message (d) r r Examples of schedules and jamming packes A wireless clien begins o lisen o he wireless channel upon a reques for new informaion. In order o saisfy is reques, he clien mus receive a leas k symbols from he curren or subsequen packes. In paricular, if he clien fails o receive k symbols from he curren packe, i coninues o lisen o he channel, unil i receives a leas k symbols from one of he subsequen packes. The are wo key performance characerisics of he schedule: he expeced waiing ime and he maximum saleness of he received daa. Definiion (Waiing ime WT (S)): Le S be a broadcas schedule. Suppose ha he clien s reques was placed a ime. Le n be he number of he packe currenly ransmied over he channel, i.e., he packe for which i holds ha n < n+1. Le be he firs ime he clien receives a leas k symbols from a packe n, n n. Then, he waiing ime of he clien is defined as WT = 1. We subrac one from he waiing ime, because he clien will lisen a leas ha long for any updae. We assume ha he cliens requess are disribued uniformly over ime. Accordingly, he expeced waiing ime of he cliens is defined as follows: Definiion (Expeced Waiing Time EWT(S)): Le S be a broadcas schedule. Then, he expeced waiing ime is defined as follows: T 1 EWT(S) = lim WT (S)d (1) T T 0 The waiing ime is an exremely imporan parameer for many ime-sensiive applicaions. In addiion, i is closely relaed o he amoun of power spen by he clien o obain he informaion. The saleness of he daa is defined o be he amoun of ime ha passes from he momen an updae is generaed unil i is delivered o he clien. The saleness capures he qualiy of delivered informaion, because in dynamic seings he informaion becomes less and less relevan wih ime. Definiion (Saleness ST (S)): Le S be a broadcas schedule. Suppose ha he clien s reques was placed a ime. Le n be he number of he packe currenly ransmied over he channel, i.e., he packe for which i holds ha n < n+1. Le be he firs ime he clien receives a leas k symbols from an updae n, n n. Then, he saleness
3 of he daa is defined o be ST = n 1, where n is he ime he updae n was generaed. Again, we subrac one from he saleness, because he clien will lisen a leas ha long for any updae. For example, consider he schedule depiced in Figure (a). Le be ime he clien pus a reques for he new informaion and le n be he number of he packe currenly ransmied over he channel. Then, he number of symbols received by he clien from packe n is equal o n = ( r r )k. If n k, hen he clien will be able o decode his packe, hence is waiing ime is zero. Oherwise, he clien needs o wai for he nex packe, hence is waiing ime is equal o n k. I is easy o verify ha if he requess are disribued uniformly over ime, hen he expeced waiing ime is k n = 1 r. While redundan ransmission improves he expeced waiing ime of a schedule, i comes a a price in erms of he saleness of he received daa. Indeed, if n k, hen he updae received by he clien a ime, was generaed in ime r r, hence he saleness of he daa is r r. On he oher hand, if n < k, hen he clien will ge a new updae, hence he saleness is zero. A schedule ha ransmis all updaes over ime inervals of equal lengh is referred o as a regular schedule. Regular schedules provide firm guaranees on he saleness of he received daa. In paricular, schedule S r = {r, r,... } ensures ha he saleness of he received informaion is a mos r 1 ime unis. In addiion, a regular schedule uses he same encoding for each packe, which simplifies he design of he mobile device and reduces is cos. Jammer model We focus on pulse erasure jammers. Such jammers produce a sequence of pulses, each pulse resuls in an erasure in he channel. Definiion 5 (Jamming Sequence J ): A jamming sequence is a sequence {h 1, l 1, h, l,... }, such ha h 1 is he beginning ime of he firs pulse, l i is he lengh of pulse i, and h i, i is he lengh of ime inerval beween pulses i 1 and i. Figure (c) depics an example of a jamming sequence. I has been recognized [1] ha he power supply is he mos imporan limiaion for he majoriy of pracical jammers. A ypical jammer is powered by a baery, which can be recharged from an exernal source, such as a solar cell array. Accordingly, in our model, we limi he lengh of pulses in he jamming sequence by a consrain l max, i.e., l i l max for all i 1. Since afer each pulse he baery mus be recharged we also consrain he lengh of he inerval beween wo consecuive pulses o be a leas h min, i.e., h i h min for all i. We refer o a jamming sequence ha saisfies he energy limiaions as an admissible jamming sequence. We denoe by WT (S, J ) he waiing ime of schedule S in he presence of jammer J. Similarly, he expeced waiing ime of a schedule S in he presence of jammer J is denoed by EWT(S, J ), i.e., EWT(S, J ) = 1 T lim T T 0 WT (S, J )d. For example, suppose ha a jamming sequence J = {1, 1, 1,... } is applied o he schedule S = {,,... } (see Figure (d)). In his case, he expeced waiing ime is equal o r Lower Bound Upper Bound r < r < 1 + r 1 + r r = < r < r < i r < i + 1, i =,... i + 1 r < i + i =,,... i + r < (i + 1) i =,, r r r+ r + 10+r r r δ 5δ+10 TABLE I 18 + δ δ+10 + δ δ r r + δ δ+10 + δ δ+10 UPPER AND LOWER BOUNDS ON THE MAXIMUM EXPECTED WAITING TIME MWT(S r) OF REGULAR SCHEDULES S r = {r, r,... }. HERE, Expeced Waiing Time δ = r r Fig.. The lower and upper bounds on MWT(S r). The lower and upper bounds are marked by solid and dashed lines, respecively. EWT(S, J ) = 11/1, which is by 5 1 more han he expeced waiing ime of he same schedule wihou jamming. For a given schedule S, we define is maximum waiing ime MWT(S) o be he maximum value of EWT(S, J ) over all admissible jamming sequences J. The maximum waiing ime characerizes he wors-case behavior of he schedule in he presence of an adversarial jammer. Resuls In his sudy we invesigaed he performance of broadcas schedules in he presence of a jammer. Firs, we esablished lower and upper bounds on he maximum expeced waiing ime MWT(S r ) of regular schedules S r = {r, r,... }. Then, we exended our resuls for general schedules and invesigaed he rade-off beween he maximum expeced waiing ime MWT(S r ) and he saleness consrain. Our resuls for regular schedules are summarized in Table I and in Figure. All of our lower bounds are consrucive as we presen jamming sequences ha yield he expecing waiing imes equal o he value of he lower bound. We also idenify opimal jamming sequences for many classes of regular schedules. All resuls are up o erms of order ε = 1 k. I is imporan o noe ha he size of he packe r in a regular schedule S r is closely relaed o he saleness of he delivered informaion. Indeed, he maximum saleness of he daa is always lower or equal o r 1, while is average saleness does no exceed r 1 r. Hence our resuls esablish a r
4 ' M I 1 I I I B B 1 B B B 5 B 6 B " M Fig.. Division of a inerval I M ino blocks and subinervals I 1,..., I. rade-off beween he expeced waiing ime of he cliens and he saleness. In paricular, we idenify he bes schedule for any given saleness consrain. We observe ha he schedule S has a clear advanage over oher schedules: i achieves low expeced waiing ime wih minimum penaly in erms of he saleness of he delivered daa. In addiion, we esablished upper and lower bounds on he wors case waiing ime MWT(S) for a general class of non-regular schedules. This class includes schedules in which he lengh of each packe is differen and he schedules ha employ randomizaion, i.e., he lengh of each packe is disribued according o some probabiliy disribuion. We assume ha in he case of random schedules he jammer knows he probabiliy disribuion bu has no access o he server s random bis. Theorem 6: Le S be a schedule and le r be he expeced lengh of he packes in S. Then he wors case expeced waiing ime MWT(S) of he schedule in he presence of an admissible jammer is bounded by + r MWT(S) + 11 () Due o he space consrains, mos of he proofs and echnical deails are omied from his paper and can be found in [15]. III. UPPER BOUNDS FOR REGULAR SCHEDULES In his secion we esablish upper bounds on he opimal jamming sequences for regular schedules S r for a cerain range of values of r. We begin by inroducing he noion of added waiing ime. Le I = [, ] be a ime inerval, S be a schedule, and J be a jamming sequence. Then, he added waiing ime for inerval I is defined o be AWT(I, J ) = (WT (S, J ) WT (S))d. Inuiively, AWT(I, J ) capures he oal amoun of addiional waiing ime experienced by cliens requess ha arrive during inerval I due o jamming. Le S r, r be a regular schedule, J be an admissible jamming sequence, and I M = [ M, M ] be a ime inerval allocaed for ransmission of a single updae. Our goal is o obain an upper bound on AWT(I, J ). Such a bound would immediaely ranslae in an upper bound on MWT(S r ). We denoe by 1,..., h he finishing imes of he jamming pulses ha belong o I M and divide I M ino h + 1 blocks B 1,..., B h+1, such ha B 1 = [ M, 1], B i = [ i 1, i ] for i h, and B h+1 = [ h, M ] (See Figure ). We also divide I M ino subinervals I 1,...,I such ha ha I 1 = B 1, I includes blocks B,...,B h 1, I = B h, and I = B h+1. We denoe by T i he lengh of he subinerval I i. In he following lemma we esablish an upper bound for each of he subinervals I 1,...,I. Lemma 7: T1 / if T 1 1 AWT(I 1, J ) T 1 1/ if 1 T 1 AWT(I, J ) AWT(I, J ) AWT(I, J ) { T+δ 5δ if T is odd, ( T ) oherwise, T (T )+T +T 1 if T < 1 T 1 if T 1 T if T < 1 T +T 1 if T 1 () where δ = T T. Proof: See [15]. We assume, wihou loss of generaliy, ha inervals I 1, I, or I do no conain an unjammed inerval whose lengh is longer han one ime uni. Indeed, if his is he case, such an inerval can be shorened a he expense of one of he unjammed inervals in I, wih no increase in he value of AWT(I M, J ). This implies ha T 1, T, T. The added waiing ime for he inerval I M equals o he sum of he added waiing imes for is subinervals I 1,...,I, i.e., AWT(I M, J ) = AWT(I 1, J )+AWT(I, J )+AWT(I, J )+AWT(I, J ). An upper bound on AWT(I M, J ) can be found by solving he following maximizaion program: maximize AWT(I M, J ) subjec o T 1 + T + T + T = r T i 0 i = 1,..., T i i = 1,, I can be shown, using he ools of he heory of consrained opimizaion ha for r, he opimal value of AWT(I M, J ) is achieved when he following condiions are saisfied: (a) T 1 = r T T T, (b) T = r (c) T = (d) T = 1. If r and r is an even number his implies he following upper bound on AWT(I M, J ): AWT(I M, J ) which, in urn, implies ha r r r, MWT(S r ) r r (5) If r and r is an odd number, hese condiion imply he following upper bound on AWT(I M, J ): r + 8 δ + δ AWT(I M, J ), where δ = r r. This, in urn, implies ha MWT(S r ) + δ δ + 8. (6) We conclude our discussion by he following heorem: Theorem 8: Le S r = {r, r, } be a regular schedule. Then if r and he ineger par of r is an odd number ()
5 Fig. 5. r= Message 5 Message (a) Message (b) Message Message.6+ 1 Message Jamming sequences for regular schedules J r (a) r=.5 (b) hen MWT(S r ) + 10+δ δ, where δ = r r. If r and he ineger par r of r is an even number, hen MWT(S r ) + r r +10. IV. LOWER BOUNDS Theorem 9: Le S r be a regular schedule. Then, up o erms of order ε = 1 k, MWT(S r ) 1 + r if r < 6r if r < 1 + r r r if 1 + r < + 10+r r if i r < i + 1, i =,,... r +11 if i + 1 r < i +, i =,,... + δ 5δ+10 if i + r < (i + 1), i =,,... where δ = r r. Proof: We prove he heorem by presening, for each schedule S r, r a jamming sequence J r such ha EWT(S r, J r ) is equal o he values of he lower bounds saed in he heorem. For r <, J r = {1 ε, 1, 1 + δ, 1, 1 + δ,... }, where δ = r and ε = 1 k. An example of his schedule for r =.5 is depiced on Figure 5(a). For r < , J r = {1+δ+ε, 1, 1, 1 ε, 1+δ, 1 ε, 1,1, +ε+δ, 1, 1, 1 ε, 1+ δ, 1 ε, 1, 1, + ε + δ,... }, where δ = r r and ε = 1 k. This schedule is depiced on Figure 5(b). For r <, J r = {1 ε, 1, 1, δ, 1, 1, 1, δ,..., where ε = 1 k and δ = r. For i r < i + 1, i =,,..., J = {1 ε, 1, 1 + ε, 1 1, 1+δ ε, 1, 1+ε, 1,, 1, 1+δ ε, }, where ε = 1 k and δ = r r. For i+1 r < i+, i =,,..., J = {1 ε, 1, 1+δ + ε, 1, ε, 1, 1+ δ +ε,... }, where ε = 1 k and δ = r r. For i + r < (i + 1), i =,,..., J R = (1 ε, 1, 1, δ, 1,, 1, δ, ), J R = {1 ε, 1, 1, δ, 1,, 1, δ, }), where ε = 1 k and δ = r r. V. CONCLUSION We invesigaed he design of efficien ani-jamming schedules for wireless daa disribuion sysems. For such schedules, waiing ime and saleness are he key performance parameers. (7) The goal of he jammer is o induce large delays in daa ransmission and o increase he saleness of he daa by forcing he schedule o ransmi he daa wih high level of redundancy. Our conribuion can be summarized as follows. Firs, we idenify opimal and near opimum jamming sraegies for he imporan class of regular schedules. In such schedules, he same encoding is used for all packes, which simplifies he design of he mobile device and reduces is cos. Nex, we provided lower and upper bounds on he performance of more general class of non-regular schedules. Our resuls esablish a rade-off beween he expeced waiing ime of he clien and he saleness of he informaion in he presence of a jammer. As a fuure research, we inend o exend our resuls o he case in which he broadcas channel is shared by wo or more informaion sources. We also would like o invesigae he performance of random ani-jamming schedules for wireless daa broadcas. REFERENCES [1] T. Imielinski, S. Viswanahan, and B.R. Badrinah. Daa on Air: Organizaion and Access. IEEE Transacions on Knowledge and Daa Engineering, 9():5 7, [] D. Cherion. Disseminaion-Oriened Communicaion Sysems. Technical repor, Sanford Universiy, 199. [] S. Acharya, R. Alonso, M. Franklin, and S. Zdonik. Broadcas Disks: Daa Managemen for Asymmeric Communicaion Environmens. In Proceedings of ACM SIGMOD, pages , San Jose, CA, May [] A. J. Vierbi. Spread Specrum Communicaions: Myhs and Realiies. IEEE Communicaion Magazine, 50h Anniversary Commemoraive issue, pages 1, May 00. [5] M. K. Simon, J. K. Omura, R. A. Scholz, and B. K. Levi. Spread Specrum Communicaions Handbook. McGraw Hill, [6] K. Folz and J. Bruck. Time Division is Beer han Frequency Division for Periodic Inerne Broadcas of Dynamic Daa. In Proceedings of Inernaional Symposium on Informaion Theory (ISIT), page 158, Washingon, DC, July 001. [7] K. Folz and J. Bruck. Spliing Schedules for Inerne Broadcas Communicaion. IEEE Transacions on Informaion Theory, 8():5 58, February 00. [8] K. Folz and J. Bruck. Robusness of Time-Division Schedules for Inerne Broadcas. In Proceedings of Inernaional Symposium on Informaion Theory (ISIT), page 8, Lausanns, Swizerland, June-July 00. [9] K. Folz, L. Xu, and J. Bruck. Scheduling for Efficien Daa Broadcas over Two Channels. In Proceedings of Inernaional Symposium on Informaion Theory (ISIT), page 11, Chicago, IL, USA, June 00. [10] K. Folz, L. Xu, and J. Bruck. Coding and Scheduling for Efficien Loss- Resilien Daa Broadcasing. In Proceedings of Inernaional Symposium on Informaion Theory (ISIT), page 1, Yokohama, Japan, June-July 00. [11] M. Langberg, A. Sprinson, and J. Bruck. Opimal Universal Schedules for Discree Broadcas. In Proceedings of Inernaional Symposium on Informaion Theory (ISIT), Chicago, IL, USA, June-July 00. [1] M. Langberg, A. Sprinson, and J. Bruck. Saleness vs. Waiing Time in Universal Discree Broadcas. In Submied o ISIT 005. available from hp:// [1] W.C. Huffman and V.S. Pless. Handbook of Coding Theory, vol. 1. Elsevier Science, [1] G. Lin and G. Noubir. On Link Layer Denial of Service in DATA Wireless LANs. Wiley Journal on Wireless Communicaions and Mobile Compuing, o appear. [15] P. Codenoi, A. Sprinson, and J. Bruck. Ani-Jamming Schedules for Wireless Broadcas Sysems. ETR070, California Insiue of Technology, July, 005. Available from: hp://
Examination Mobile & Wireless Networking ( ) April 12,
Page 1 of 5 Examinaion Mobile & Wireless Neworking (192620010) April 12, 2017 13.45 16.45 Noes: Only he overhead shees used in he course, 2 double-sided shees of noes (any fon size/densiy!), and a dicionary
More informationEvaluation of Instantaneous Reliability Measures for a Gradual Deteriorating System
General Leers in Mahemaic, Vol. 3, No.3, Dec 27, pp. 77-85 e-issn 259-9277, p-issn 259-9269 Available online a hp:\\ www.refaad.com Evaluaion of Insananeous Reliabiliy Measures for a Gradual Deerioraing
More informationReceiver-Initiated vs. Short-Preamble Burst MAC Approaches for Multi-channel Wireless Sensor Networks
Receiver-Iniiaed vs. Shor-Preamble Burs MAC Approaches for Muli-channel Wireless Sensor Neworks Crisina Cano, Boris Bellala, and Miquel Oliver Universia Pompeu Fabra, C/ Tànger 122-140, 08018 Barcelona,
More informationMobile Communications Chapter 3 : Media Access
Moivaion Can we apply media access mehods from fixed neworks? Mobile Communicaions Chaper 3 : Media Access Moivaion SDMA, FDMA, TDMA Aloha Reservaion schemes Collision avoidance, MACA Polling CDMA SAMA
More informationECMA st Edition / June Near Field Communication Wired Interface (NFC-WI)
ECMA-373 1 s Ediion / June 2006 Near Field Communicaion Wired Inerface (NFC-WI) Sandard ECMA-373 1 s Ediion / June 2006 Near Field Communicaion Wired Inerface (NFC-WI) Ecma Inernaional Rue du Rhône 114
More informationPerformance Analysis of High-Rate Full-Diversity Space Time Frequency/Space Frequency Codes for Multiuser MIMO-OFDM
Performance Analysis of High-Rae Full-Diversiy Space Time Frequency/Space Frequency Codes for Muliuser MIMO-OFDM R. SHELIM, M.A. MATIN AND A.U.ALAM Deparmen of Elecrical Engineering and Compuer Science
More informationweight: amplitude of sine curve
Joseph Fourier s claim: all signals are sums of sinusoids of differen frequencies. weighed sine curves weigh: ampliude of sine curve all : no exacly bu doesn maer for us in pracice Example: 3 sin() + sin(*)
More informationLecture #7: Discrete-time Signals and Sampling
EEL335: Discree-Time Signals and Sysems Lecure #7: Discree-ime Signals and Sampling. Inroducion Lecure #7: Discree-ime Signals and Sampling Unlike coninuous-ime signals, discree-ime signals have defined
More informationAn off-line multiprocessor real-time scheduling algorithm to reduce static energy consumption
An off-line muliprocessor real-ime scheduling algorihm o reduce saic energy consumpion Firs Workshop on Highly-Reliable Power-Efficien Embedded Designs Shenzhen, China Vincen Legou, Mahieu Jan, Lauren
More informationECMA-373. Near Field Communication Wired Interface (NFC-WI) 2 nd Edition / June Reference number ECMA-123:2009
ECMA-373 2 nd Ediion / June 2012 Near Field Communicaion Wired Inerface (NFC-WI) Reference number ECMA-123:2009 Ecma Inernaional 2009 COPYRIGHT PROTECTED DOCUMENT Ecma Inernaional 2012 Conens Page 1 Scope...
More informationOn the Scalability of Ad Hoc Routing Protocols
On he Scalabiliy of Ad Hoc Rouing Proocols César A. Saniváñez Bruce McDonald Ioannis Savrakakis Ram Ramanahan Inerne. Research Dep. Elec. & Comp. Eng. Dep. Dep. of Informaics Inerne. Research Dep. BBN
More informationNegative frequency communication
Negaive frequency communicaion Fanping DU Email: dufanping@homail.com Qing Huo Liu arxiv:2.43v5 [cs.it] 26 Sep 2 Deparmen of Elecrical and Compuer Engineering Duke Universiy Email: Qing.Liu@duke.edu Absrac
More informationWrap Up. Fourier Transform Sampling, Modulation, Filtering Noise and the Digital Abstraction Binary signaling model and Shannon Capacity
Wrap Up Fourier ransorm Sampling, Modulaion, Filering Noise and he Digial Absracion Binary signaling model and Shannon Capaciy Copyrigh 27 by M.H. Perro All righs reserved. M.H. Perro 27 Wrap Up, Slide
More informationDuty Cycle Scheduling in Dynamic Sensor Networks for Controlling Event Detection Probabilities
Duy Cycle Scheduling in Dynamic Sensor Neworks for Conrolling Even Deecion Probabiliies Hassan Jaleel, Amir Rahmani, and Magnus Egersed Absrac A sensor nework comprising of RF or radarbased sensors has
More informationComparing image compression predictors using fractal dimension
Comparing image compression predicors using fracal dimension RADU DOBRESCU, MAEI DOBRESCU, SEFA MOCAU, SEBASIA ARALUGA Faculy of Conrol & Compuers POLIEHICA Universiy of Buchares Splaiul Independenei 313
More informationPulse Train Controlled PCCM Buck-Boost Converter Ming Qina, Fangfang Lib
5h Inernaional Conference on Environmen, Maerials, Chemisry and Power Elecronics (EMCPE 016 Pulse Train Conrolled PCCM Buck-Boos Converer Ming Qina, Fangfang ib School of Elecrical Engineering, Zhengzhou
More informationDirect Analysis of Wave Digital Network of Microstrip Structure with Step Discontinuities
Direc Analysis of Wave Digial Nework of Microsrip Srucure wih Sep Disconinuiies BILJANA P. SOŠIĆ Faculy of Elecronic Engineering Universiy of Niš Aleksandra Medvedeva 4, Niš SERBIA MIODRAG V. GMIROVIĆ
More informationKey Issue. 3. Media Access. Hidden and Exposed Terminals. Near and Far Terminals. FDD/FDMA General Scheme, Example GSM. Access Methods SDMA/FDMA/TDMA
Key Issue Can we apply media access mehods from fixed neworks? 3. Media Access SDMA, FDMA, TDMA Aloha and Reservaion Schemes Avoidance and Polling MACA, CDMA, SAMA Example CSMA/CD: Carrier Sense Muliple
More informationLecture 11. Digital Transmission Fundamentals
CS4/MSc Compuer Neworking Lecure 11 Digial Transmission Fundamenals Compuer Neworking, Copyrigh Universiy of Edinburgh 2005 Digial Transmission Fundamenals Neworks consruced ou of Links or ransmission
More informationNotes on the Fourier Transform
Noes on he Fourier Transform The Fourier ransform is a mahemaical mehod for describing a coninuous funcion as a series of sine and cosine funcions. The Fourier Transform is produced by applying a series
More informationTR-MAC: An Energy-E cient MAC Protocol for Wireless Sensor Networks exploiting Noise-based Transmitted Reference Modulation
TR-MAC: An Energy-E cien MAC Proocol for Wireless Sensor Neworks exploiing Noise-based Transmied Reference Modulaion Sarwar Morshed and Geer Heijenk Universiy of Twene, The Neherlands {s.morshed, geer.heijenk}@uwene.nl
More informationTHE Cisco visual network index report predicts a drastic
IEEE TRANSACTIONS ON MULTIMEDIA, VOL. 18, NO. 7, JULY 2016 1401 Qualiy of Experience Driven Muli-User Video Sreaming in Cellular Cogniive Radio Neworks Wih Single Channel Access Zhifeng He, Shiwen Mao,
More informationProceedings of International Conference on Mechanical, Electrical and Medical Intelligent System 2017
on Mechanical, Elecrical and Medical Inelligen Sysem 7 Consan On-ime Conrolled Four-phase Buck Converer via Saw-oohwave Circui and is Elemen Sensiiviy Yi Xiong a, Koyo Asaishi b, Nasuko Miki c, Yifei Sun
More informationNetwork Design and Optimization for Quality of Services in Wireless Local Area Networks using Multi-Objective Approach
Chuima Prommak and Naruemon Waanapongsakorn Nework Design and Opimizaion for Qualiy of Services in Wireless Local Area Neworks using Muli-Objecive Approach CHUTIMA PROMMAK, NARUEMON WATTANAPONGSAKORN *
More informationDAGSTUHL SEMINAR EPIDEMIC ALGORITHMS AND PROCESSES: FROM THEORY TO APPLICATIONS
DAGSTUHL SEMINAR 342 EPIDEMIC ALGORITHMS AND PROCESSES: FROM THEORY TO APPLICATIONS A Sysems Perspecive Pascal Felber Pascal.Felber@unine.ch hp://iiun.unine.ch/! Gossip proocols Inroducion! Decenralized
More informationChapter 2 Introduction: From Phase-Locked Loop to Costas Loop
Chaper 2 Inroducion: From Phase-Locked Loop o Cosas Loop The Cosas loop can be considered an exended version of he phase-locked loop (PLL). The PLL has been invened in 932 by French engineer Henri de Belleszice
More informationPerformance Evaluation of a MAC Protocol for Radio over Fiber Wireless LAN operating in the 60-GHz band
Performance Evaluaion of a Proocol for Radio over Fiber Wireless LAN operaing in he -GHz band Hong Bong Kim, Adam Wolisz Telecommunicaion Neworks Group Deparmen of Elecrical and Compuer Engineering Technical
More informationWhen answering the following 25 questions, always remember that there is someone who has to grade them. So please use legible handwriting.
38963, VU Mobile Kommunikaion Miderm Exam: Insiu für Nachrichenechnik und Hochfrequenzechnik When answering he following 5 quesions, always remember ha here is someone who has o grade hem So please use
More informationModeling the Reliability of Packet Group Transmission in Wireless Network
Modeling he Reliabiliy of Packe Group Transmission in Wireless ework Hao Wen, Chuang Lin, Hongkun Yang, Fengyuan Ren, Yao Yue Tsinghua Universiy, Beijing China Cornell Universiy, USA {wenhao, clin, yanghk,
More informationExplanation of Maximum Ratings and Characteristics for Thyristors
8 Explanaion of Maximum Raings and Characerisics for Thyrisors Inroducion Daa shees for s and riacs give vial informaion regarding maximum raings and characerisics of hyrisors. If he maximum raings of
More informationEXPERIMENT #9 FIBER OPTIC COMMUNICATIONS LINK
EXPERIMENT #9 FIBER OPTIC COMMUNICATIONS LINK INTRODUCTION: Much of daa communicaions is concerned wih sending digial informaion hrough sysems ha normally only pass analog signals. A elephone line is such
More informationA WIDEBAND RADIO CHANNEL MODEL FOR SIMULATION OF CHAOTIC COMMUNICATION SYSTEMS
A WIDEBAND RADIO CHANNEL MODEL FOR SIMULATION OF CHAOTIC COMMUNICATION SYSTEMS Kalle Rui, Mauri Honanen, Michael Hall, Timo Korhonen, Veio Porra Insiue of Radio Communicaions, Helsini Universiy of Technology
More informationMultiple Load-Source Integration in a Multilevel Modular Capacitor Clamped DC-DC Converter Featuring Fault Tolerant Capability
Muliple Load-Source Inegraion in a Mulilevel Modular Capacior Clamped DC-DC Converer Feauring Faul Toleran Capabiliy Faisal H. Khan, Leon M. Tolber The Universiy of Tennessee Elecrical and Compuer Engineering
More informationB-MAC Tunable MAC protocol for wireless networks
B-MAC Tunable MAC proocol for wireless neworks Summary of paper Versaile Low Power Media Access for Wireless Sensor Neworks Presened by Kyle Heah Ouline Inroducion o B-MAC Design of B-MAC B-MAC componens
More informationA New Design of Private Information Retrieval for Storage Constrained Databases
A ew Design of Privae Informaion Rerieval for Sorage Consrained Daabases icholas Woolsey, Rong-Rong Chen, and Mingyue Ji Deparmen of Elecrical and Compuer Engineering, Universiy of Uah Sal Lake Ciy, UT,
More informationWill my next WLAN work at 1 Gbps?
Will my nex WLAN work a 1 Gbps? Boris Bellala boris.bellala@upf.edu hp://www.dic.upf.edu/ bbellal/ Deparmen of Informaion and Communicaion Technologies (DTIC) Universia Pompeu Fabra (UPF) 2013 Ouline Moivaion
More informationDS CDMA Scheme for WATM with Errors and Erasures Decoding
DS CDMA Scheme for WATM wih Errors and Erasures Decoding Beaa J. Wysocki*, Hans-Jürgen Zepernick*, and Tadeusz A. Wysocki** * Ausralian Telecommunicaions Research Insiue Curin Universiy of Technology GPO
More informationELEG 3124 SYSTEMS AND SIGNALS Ch. 1 Continuous-Time Signals
Deparmen of Elecrical Engineering Universiy of Arkansas ELEG 3124 SYSTEMS AND SIGNALS Ch. 1 Coninuous-Time Signals Dr. Jingxian Wu wuj@uark.edu OUTLINE 2 Inroducion: wha are signals and sysems? Signals
More informationTHE economic forces that are driving the cellular industry
IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS, VOL. XX, NO. XX, MAY 2013 1 Balancing Specral Efficiency, Energy Consumpion, and Fairness in Fuure Heerogeneous Wireless Sysems wih Reconfigurable Devices
More informationChannel Estimation for Wired MIMO Communication Systems
Channel Esimaion for Wired MIMO Communicaion Sysems Final Repor Mulidimensional DSP Projec, Spring 2005 Daifeng Wang Absrac This repor addresses raining-based channel modeling and esimaion for a wired
More informationSpecial Features. Mechanical Data. Transmitte r with TSHFxxxx 1 OUT
IR Receiver for High Daa Rae PCM a 455 khz Descripion The TSOP7000 is a miniaurized receiver for infrared remoe conrol and IR daa ransmission. PIN diode and preamplifier are assembled on lead frame, he
More informationProcess-Stacking Multiplexing Access for 60 GHz Millimeter-Wave WPANs
Process-Sacking Muliplexing Access for 6 GHz Millimeer-Wave WPANs Claudio Esevez, David Fuenealba, Aravind Kailas Deparmen of Elecrical Engineering, Universidad de Chile, Saniago, Chile {cesevez, dfuenea}@ing.uchile.cl
More informationQoE Driven Video Streaming in Cognitive Radio Networks: The Case of Single Channel Access
Globecom 2014 - Communicaions Sofware, Services and Mulimedia Symposium QoE Driven Video Sreaming in Cogniive Radio Neworks: The Case of Single Channel Access Zhifeng He, Shiwen Mao Deparmen of Elecrical
More informationPerformance Analysis of A Burst-Frame-Based MAC Protocol for Ultra-Wideband Ad Hoc Networks
Performance Analysis of A Burs-Frame-Based MAC Proocol for Ulra-Wideband Ad Hoc Neworks Kejie Lu, Dapeng Wu, Yuguang Fang Deparmen of Elecrical and Compuer Engineering Universiy Of Florida Gainesville,
More informationLecture September 6, 2011
cs294-p29 Seminar on Algorihmic Game heory Sepember 6, 2011 Lecure Sepember 6, 2011 Lecurer: Chrisos H. Papadimiriou Scribes: Aloni Cohen and James Andrews 1 Game Represenaion 1.1 abular Form and he Problem
More informationInvestigation and Simulation Model Results of High Density Wireless Power Harvesting and Transfer Method
Invesigaion and Simulaion Model Resuls of High Densiy Wireless Power Harvesing and Transfer Mehod Jaber A. Abu Qahouq, Senior Member, IEEE, and Zhigang Dang The Universiy of Alabama Deparmen of Elecrical
More informationTELE4652 Mobile and Satellite Communications
TELE465 Mobile and Saellie Communicaions Assignmen (Due: 4pm, Monday 7 h Ocober) To be submied o he lecurer before he beginning of he final lecure o be held a his ime.. This quesion considers Minimum Shif
More informationP. Bruschi: Project guidelines PSM Project guidelines.
Projec guidelines. 1. Rules for he execuion of he projecs Projecs are opional. Their aim is o improve he sudens knowledge of he basic full-cusom design flow. The final score of he exam is no affeced by
More informationSimultaneous Operation of Multiple Collocated Radios and the Scanning Problem
Simulaneous Operaion of Muliple ollocaed adios and he Scanning Problem Michel arbeau arleon Universiy, School of ompuer Science 5302 Herzberg uilding, 1125 olonel y Drive, Oawa, Onario, K1S 56, anada E-mail:
More informationUltrawideband Normalized Radar Cross Sections of Distributed Clutter
Ulrawideband Normalized Radar Cross Secions o Disribued Cluer Ram M. Narayanan Deparmen o Elecrical Engineering The Pennsylvania Sae Universiy Universiy Park, PA 68, USA ram@engr.psu.edu Absrac Theoreical
More informationThe design of an improved matched filter in DSSS-GMSK system
Journal of Physics: Conference Series PAPER OPEN ACCESS The design of an improved mached filer in DSSS-GMSK sysem To cie his aricle: Mao Wei-ong e al 16 J. Phys.: Conf. Ser. 679 1 View he aricle online
More informationA3-305 EVALUATION OF FAILURE DATA OF HV CIRCUIT-BREAKERS FOR CONDITION BASED MAINTENANCE. F. Heil ABB Schweiz AG (Switzerland)
21, rue d'arois, F-75008 Paris hp://www.cigre.org A3-305 Session 2004 CIGRÉ EVALUATION OF FAILURE DATA OF HV CIRCUIT-BREAKERS FOR CONDITION BASED MAINTENANCE G. Balzer * D. Drescher Darmsad Universiy of
More informationHS0038B5. IR Receiver Modules for Remote Control Systems. Vishay Semiconductors
IR Receiver Modules for Remoe Conrol Sysems Descripion The - series are miniaurized receivers for infrared remoe conrol sysems. PIN diode and preamplifier are assembled on lead frame, he epoxy package
More informationDemand-based Network Planning for Large Scale Wireless Local Area Networks
1 Demand-based Nework Planning for Large Scale Wireless Local Area Neworks Chuima Prommak, Joseph Kabara, Senior Member, and David Tipper, Senior Member Absrac A novel approach o he WLAN design problem
More informationTSOP12.. IR Receiver Modules for Remote Control Systems VISHAY. Vishay Semiconductors
TSOP1.. IR Receiver Modules for Remoe Conrol Sysems Descripion The TSOP1.. - series are miniaurized receivers for infrared remoe conrol sysems. PIN diode and preamplifier are assembled on lead frame, he
More information4.5 Biasing in BJT Amplifier Circuits
4/5/011 secion 4_5 Biasing in MOS Amplifier Circuis 1/ 4.5 Biasing in BJT Amplifier Circuis eading Assignmen: 8086 Now le s examine how we C bias MOSFETs amplifiers! f we don bias properly, disorion can
More informationTSOP322.. IR Receiver Modules for Remote Control Systems VISHAY. Vishay Semiconductors
TSOP3.. IR Receiver Modules for Remoe Conrol Sysems Descripion The TSOP3.. - series are miniaurized receivers for infrared remoe conrol sysems. PIN diode and preamplifier are assembled on lead frame, he
More informationDevelopment of Temporary Ground Wire Detection Device
Inernaional Journal of Smar Grid and Clean Energy Developmen of Temporary Ground Wire Deecion Device Jing Jiang* and Tao Yu a Elecric Power College, Souh China Universiy of Technology, Guangzhou 5164,
More informationCollaborative communication protocols for wireless sensor networks
Collaboraive communicaion proocols for wireless sensor neworks Sefan Dulman, Lodewijk v. Hoesel, Tim Nieberg, Paul Havinga Faculy of Elecrical Engineering, Mahemaics and Compuer Science Universiy of Twene
More informationPhoto Modules for PCM Remote Control Systems
Phoo Modules for PCM Remoe Conrol Sysems Descripion The HS38B series are miniaurized receivers for infrared remoe conrol sysems. PIN diode and preamplifier are assembled on lead frame, he epoxy package
More informationThe Influence of Propagation Environment in a Live GSM Network
The Influence of Propagaion Environmen in a ive GSM Nework Yu-Huei Tseng, Wen-Shyang Hwang, *Ce-Kuen Shieh Deparmen of Elecrical Engineering, Naional Kaohsiung Universiy of Applied Sciences, Kaohsiung,
More informationAN303 APPLICATION NOTE
AN303 APPLICATION NOTE LATCHING CURRENT INTRODUCTION An imporan problem concerning he uilizaion of componens such as hyrisors or riacs is he holding of he componen in he conducing sae afer he rigger curren
More informationLecture 4. EITN Chapter 12, 13 Modulation and diversity. Antenna noise is usually given as a noise temperature!
Lecure 4 EITN75 2018 Chaper 12, 13 Modulaion and diversiy Receiver noise: repeiion Anenna noise is usually given as a noise emperaure! Noise facors or noise figures of differen sysem componens are deermined
More informationIR Receiver Module for Light Barrier Systems
New Produc IR Receiver Module for Ligh Barrier Sysems TSSP5838 1926 FEATURES Low supply curren Phoo deecor and preamplifier in one package Inernal filer for 38 khz IR signals Shielding agains EMI Supply
More informationGeographic Random Forwarding (GeRaF) for ad hoc and sensor networks: energy and latency performance
Geographic Random Forwarding (GeRaF) for ad hoc and sensor neworks: energy and laency performance Michele Zorzi, Senior Member, IEEE, and Ramesh R. Rao, Senior Member, IEEE o appear in he IEEE Transacions
More informationIncreasing Measurement Accuracy via Corrective Filtering in Digital Signal Processing
ISSN(Online): 39-8753 ISSN (Prin): 347-67 Engineering and echnology (An ISO 397: 7 Cerified Organizaion) Vol. 6, Issue 5, ay 7 Increasing easuremen Accuracy via Correcive Filering in Digial Signal Processing
More informationA Novel D2D Data Offloading Scheme for LTE Networks
A Novel DD Daa Offloading Scheme for LTE Neworks Zehua Wang and Vincen W.S. Wong Deparmen of Elecrical and Compuer Engineering The Universiy of Briish Columbia, Vancouver, Canada e-mail: {zwang, vincenw}@ece.ubc.ca
More informationDURING last decade, many communication technologies
1 TeamPhone: Neworking Smarphones for isaser Recovery Zongqing Lu, Guohong ao, and Thomas La Pora and suppors daa communicaions among rescue workers in infrasrucure-consrained and infrasrucure-less scenarios.
More informationf t 2cos 2 Modulator Figure 21: DSB-SC modulation.
4.5 Ampliude modulaion: AM 4.55. DSB-SC ampliude modulaion (which is summarized in Figure 21) is easy o undersand and analyze in boh ime and frequency domains. However, analyical simpliciy is no always
More informationIEEE COMSOC MMTC Communications - Frontiers
IEEE COMSOC MMTC Communicaions - Froniers 1. Inroducion QoE Driven Video Sreaming over Cogniive Radio Neworks for Muli-User wih Single Channel Access Mingie Feng, Zhifeng He and Shiwen Mao Auburn Universiy,
More informationECE-517 Reinforcement Learning in Artificial Intelligence
ECE-517 Reinforcemen Learning in Arificial Inelligence Lecure 11: Temporal Difference Learning (con.), Eligibiliy Traces Ocober 8, 2015 Dr. Iamar Arel College of Engineering Deparmen of Elecrical Engineering
More informationDynamic Multiple-Message Broadcast: Bounding Throughput in the Affectance Model
Dynamic Muliple-Message Broadcas: Bounding Throughpu in he Affecance Model Dariusz R. Kowalski Universiy of Liverpool Dep. of Compuer Science Liverpool, UK D.Kowalski@liv.ac.uk Miguel A. Moseiro Kean Universiy
More informationTo Relay or Not to Relay: Learning Device-to-Device Relaying Strategies in Cellular Networks
To Relay or No o Relay: Learning Device-o-Device Relaying Sraegies in Cellular Neworks Nicholas Masronarde, Viral Pael, Jie Xu, Lingia Liu, and Mihaela van der Schaar Absrac- We consider a cellular nework
More informationOn the Security of Angle of Arrival Estimation
On he Securiy of Angle of Arrival Esimaion Amr Abdelaziz, C. Emre Koksal and Hesham El Gamal Deparmen of Elecrical and Compuer Engineering The Ohio Sae Universiy Columbus, Ohio 43201 arxiv:1607.00467v1
More informationEE 330 Lecture 24. Amplification with Transistor Circuits Small Signal Modelling
EE 330 Lecure 24 Amplificaion wih Transisor Circuis Small Signal Modelling Review from las ime Area Comparison beween BJT and MOSFET BJT Area = 3600 l 2 n-channel MOSFET Area = 168 l 2 Area Raio = 21:1
More informationI. Introduction APLETHORA of real-time multimedia streaming applications
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS FOR VIDEO TECHNOLOGY, VOL. 20, NO. 2, FEBRUARY 2010 297 Fairness Sraegies for Wireless Resource Allocaion Among Auonomous Mulimedia Users Hyunggon Park, Member,
More informationForeign Fiber Image Segmentation Based on Maximum Entropy and Genetic Algorithm
Journal of Compuer and Communicaions, 215, 3, 1-7 Published Online November 215 in SciRes. hp://www.scirp.org/journal/jcc hp://dx.doi.org/1.4236/jcc.215.3111 Foreign Fiber Image Segmenaion Based on Maximum
More informationReview Wireless Communications
EEC173B/ECS152C, Winer 2006 Review of las week s maerial Wireless Channel Access Challenges: Hidden/Exposed Terminals Access Mehods: SDMA, FDMA, TDMA, CDMA Random Access: Aloha, CSMA/CD, Reservaion Chuah,
More informationPhoto Modules for PCM Remote Control Systems
Phoo Modules for PCM Remoe Conrol Sysems Available ypes for differen carrier frequencies Type fo Type fo TSOP223 3 khz TSOP2233 33 khz TSOP2236 36 khz TSOP2237 36.7 khz TSOP2238 38 khz TSOP224 4 khz TSOP2256
More informationTRADITIONAL wireless sensor networks (WSNs) are constrained
JOURNAL OF L A T E X CLASS FILES, VOL., NO. 8, AUGUST 5 CHASE: Charging and Scheduling Scheme for Sochasic Even Capure in Wireless Rechargeable Sensor Newors Haipeng Dai, Member, IEEE, Qiufang Ma, Xiaobing
More informationNetwork Performance Metrics
Fundamenals of Compuer Neworks ECE 478/578 Lecure #3 Insrucor: Loukas Lazos Dep of Elecrical and Compuer Engineering Universiy of rizona Nework Performance Merics andwidh moun of daa ransmied per uni of
More informationMotion-blurred star image acquisition and restoration method based on the separable kernel Honglin Yuana, Fan Lib and Tao Yuc
5h Inernaional Conference on Advanced Maerials and Compuer Science (ICAMCS 206) Moion-blurred sar image acquisiion and resoraion mehod based on he separable kernel Honglin Yuana, Fan Lib and Tao Yuc Beihang
More informationQ-learning Based Adaptive Zone Partition for Load Balancing in Multi-Sink Wireless Sensor Networks
Q-learning Based Adapive Zone Pariion for Load Balancing in Muli-Sink Wireless Sensor Neworks Sheng-Tzong Cheng and Tun-Yu Chang Deparmen of Compuer Science and Informaion Engineering, Naional Cheng Kung
More informationTransmit Beamforming with Reduced Feedback Information in OFDM Based Wireless Systems
Transmi Beamforming wih educed Feedback Informaion in OFDM Based Wireless Sysems Seung-Hyeon Yang, Jae-Yun Ko, and Yong-Hwan Lee School of Elecrical Engineering and INMC, Seoul Naional Universiy Kwanak
More informationIR Receiver for High Data Rate PCM at 455 khz Description
IR Receiver for High Daa Rae PCM a 455 khz Descripion The is a miniaurized receiver for infrared remoe conrol and IR daa ransmission. PIN diode and preamplifier are assembled on lead frame, he epoxy package
More informationCommunications II Lecture 7: Performance of digital modulation
Communicaions II Lecure 7: Performance of digial modulaion Professor Kin K. Leung EEE and Compuing Deparmens Imperial College London Copyrigh reserved Ouline Digial modulaion and demodulaion Error probabiliy
More informationMohammed Ali Hussain et al, / (IJCSIT) International Journal of Computer Science and Information Technologies, Vol. 2 (3), 2011,
Energy Conservaion Techniques in Ad hoc Neworks Dr. Mohammed Ali Hussain 1, M.Ravi Sankar 2, Vijaya Kumar Volei 1,Y.Srinivasa Rao 3, Nalla Lovanjaneyulu 4 1 Dep.of Compuer Science & Engineering, Sri Sai
More informationVariation Aware Cross-Talk Aggressor Alignment by Mixed Integer Linear Programming
ariaion Aware Cross-alk Aggressor Alignmen by Mixed Ineger Linear Programming ladimir Zoloov IBM. J. Wason Research Cener, Yorkown Heighs, NY zoloov@us.ibm.com Peer Feldmann D. E. Shaw Research, New York,
More informationState Space Modeling, Simulation and Comparative Analysis of a conceptualised Electrical Control Signal Transmission Cable for ROVs
Sae Space Modeling, Simulaion and omparaive Analysis of a concepualised Elecrical onrol Signal ransmission able for ROVs James Naganda, Deparmen of Elecronic Engineering, Konkuk Universiy, Seoul, Korea
More information4 20mA Interface-IC AM462 for industrial µ-processor applications
Because of he grea number of indusrial buses now available he majoriy of indusrial measuremen echnology applicaions sill calls for he sandard analog curren nework. The reason for his lies in he fac ha
More informationEfficient burst assembly algorithm with traffic prediction
Efficien burs assembly algorihm wih raffic predicion Mmoloki Mangwala, Boyce B. Sigweni and Bakhe M. Nleya Deparmen of compuer science Norh Wes Universiy, Privae Bag X2046, Mmabaho, 2735 Tel: +27 8 3892,
More informationICT 5305 Mobile Communications
ICT 5305 Mobile Communicaions Lecure - 2 April 2016 Dr. Hossen Asiful Musafa 2.1 Frequencies for communicaion VLF = Very Low Frequency LF = Low Frequency MF = Medium Frequency HF = High Frequency VHF =
More informationParameters Affecting Lightning Backflash Over Pattern at 132kV Double Circuit Transmission Lines
Parameers Affecing Lighning Backflash Over Paern a 132kV Double Circui Transmission Lines Dian Najihah Abu Talib 1,a, Ab. Halim Abu Bakar 2,b, Hazlie Mokhlis 1 1 Deparmen of Elecrical Engineering, Faculy
More informationACTIVITY BASED COSTING FOR MARITIME ENTERPRISES
ACTIVITY BASED COSTING FOR MARITIME ENTERPRISES 1, a 2, b 3, c 4, c Sualp Omer Urkmez David Sockon Reza Ziarai Erdem Bilgili a, b De Monfor Universiy, UK, c TUDEV, Insiue of Mariime Sudies, Turkey 1 sualp@furrans.com.r
More informationStarvation Mitigation Through Multi-Channel Coordination in CSMA Multi-hop Wireless Networks
Sarvaion Miigaion Through Muli-Channel Coordinaion in CSMA Muli-hop Wireless Neworks Jingpu Shi, Theodoros Salonidis, and Edward W. Knighly Deparmen of Elecrical and Compuer Engineering Rice Universiy,
More informationA Flexible Contention Resolution Scheme for QoS Provisioning in Optical Burst Switching Networks
A Flexible Conenion Resoluion Scheme for QoS Provisioning in Opical Burs Swiching Neworks Ashok K. Turuk a, Rajeev Kumar b,,1 a Deparmen of Compuer Science and Engineering, Naional Insiue of Technology,
More informationSurveillance System with Object-Aware Video Transcoder
MITSUBISHI ELECTRIC RESEARCH LABORATORIES hp://www.merl.com Surveillance Sysem wih Objec-Aware Video Transcoder Toshihiko Haa, Naoki Kuwahara, Toshiharu Nozawa, Derek Schwenke, Anhony Vero TR2005-115 April
More informationEE558 - Digital Communications
EE558 - Digial Communicaions Lecure 1: Inroducion & Overview Dr. Duy Nguyen Ouline 1 Course Informaion 2 Inroducion o Digial Communicaions Course Informaion 2 Adminisraion Hours and Locaion Lecures: TTH
More informationTraffic. analysis. The general setting. Example: buffer. Arrival Curves. Cumulative #bits: R(t), R*(t) Instantaneous speeds: r(t), r*(t)
The general seing Traffic Cumulaive #bis: R(), R*() Insananeous speeds: r(), r*() analysis R(): arrivals sysem R*(): deparures Lecure 7 2 Lecure 7 3 Example: buffer R() R*() bi rae c R() = #bis ha arrived
More informationDesign of an active radio frequency powered multihop wireless sensor network
Design of an acive radio frequency powered mulihop wireless sensor nework J.P. Olds and Winson K.G. Seah School of Engineering and Compuer Science Vicoria Universiy of Wellingon Wellingon, New Zealand
More information