Traffic Modeling and Performance Evaluation in GSM/GPRS Networks
|
|
- Damian Preston
- 6 years ago
- Views:
Transcription
1 Proceedngs of the 3th WSEAS Internatonal Conference on COMMUNICATIONS Traffc Modelng and Performance Evaluaton n GSM/ Networks Cornel Balnt, Georgeta Budura, Marza Eugen Poltehnca Unversty of Tmsoara Bd.. Parvan. No. 2 ROMANIA cornel.balnt@etc.upt.ro, georgeta.budura@etc.upt.ro Abstract: - The sharng of resources between dfferent users and dfferent servces s a key concept of rado resources dmensonng n GSM/ networks. In ths paper we present dmensonng rules based on traffc evaluaton and qualty of servce level for GSM/ users, focused on two rado resources allocaton strateges: (Complete Parttonng) and PP( Partal Parttonng).The qualty of servce s gve by the blockng probablty accordng to Erlang-B formula for voce users meanwhle for users the ndvdual throughput and the blockng probablty represent the performance parameters. The preempton probablty of voce over data users s also consdered. Key-Words: - GSM,, modelng, blockng probablty, Erlang-B law, Engset law, throughput Introducton The Internet popularty creates a large number of servces avalable onlne. These nclude, World- Wde-Web browsng, E-Mal,... The ntegraton of General Packet Rado Servce and Enhanced nto GSM system world wde rases many problems. For networks operators, equpment vendors and system ntegrators dmensonng rules have to be developed to plan and estmate the rado capacty that s needed for the predcted amount of data users when the rado resources are shared between crcut and packet swtched servces. GSM operators have been dmensonng ther networks for voce servce n terms of offered voce traffc and blockng probablty. The reference model for ths system s the Erlang-B formula []. Ths formula gves the proporton of calls that are blocked as a smple functon of system capacty and traffc ntensty. The network s desgned for supportng several types of data traffc such as Wap, Web, E-Mal, etc. Therefore traffc process characterzaton s very demandng. Usually the data traffc s very bursty and reles to the applcaton. A communcaton sesson may last for an extended perod of tme wth ntermttent packet transmssons. On the other hand the servce allows dynamc allocaton of bandwdth resources. Wreless channels are allocated to a moble termnal based on ts traffc demands whch results n a better resource utlzaton. Ths traffc behavor coupled wth flexble bandwdth allocaton n a network represent the startng pont for constructng an approprate model n order to evaluate the performance and to establsh dmensonng rules for the system. Another maor problem of GSM/ networks dmensonng s the choce of strategy to partton the avalable cell capacty between tradtonal GSM and new servces. The Rado Resources Manager (RRM) s n charge of optmzng the usage of rado resources, based on a specfc resource sharng algorthm. In ths paper we wll consder two statc resources sharng schemes: - In the frst one, called Complete Parttonng (), tme-slots (TS) are dvded nto two sets and each type of traffc s allowed to use only ts dedcated set. - The second scheme known as Partal Parttonng (PP), contans the followng channel sets: one set shared between voce and data traffc and two sets each one beng reserved for strct usage of ts dedcated traffc: voce or data. Ths scheme, offers many advantages: frst, reservng a set of tme-slots for each type of traffc allows guaranteeng, as n a mnmum QoS for each type of traffc. Second, PP scheme provde a better effcency than whch s not sutable for mzng rado utlzaton, especally n hghly varyng demand. ue to these advantages PP s wdely mplemented n a number of actually operatng GSM/ networks. Several papers have been publshed on traffc modelng and performance evaluaton n GSM/ networks. The maor works n ths feld ISSN: ISBN:
2 Proceedngs of the 3th WSEAS Internatonal Conference on COMMUNICATIONS are based on analytcal models usng queung theory and contnuous-tme Markov chans, and assumng an nfnte number of users n the cell [], [2] - [5]. In [7]-[9] analytcal models based on dscrete-tme Markov chans have been proposed and a sngle type of traffc (data traffc) s consdered. It s assumed to be generated by a fnte number of users and modeled by an Erlang-lke law. Other work s based on the modfed Engset model [6]. In our study we frst ntroduce some performance parameters for networks and then we propose a dmensonng method for estmatng the number of TS allocated for each traffc type. 2 System escrpton Our paper consders a sngle cell submtted to two dfferent types of traffc: GSM voce calls and data flows. In tradtonal crcut-swtched GSM networks, on each frequency carrer a 2 khz bandwdth s shared between 8 voce calls. Each voce call s gven a crcut, also called tme-slot (TS) because t s a Tme-vson multplexng scheme (TMA). Each voce call needs the assgnment of a sngle tme-slot for ts entre duraton. data traffc uses the same rado nterface as GSM voce calls hence rado resources avalable n the cell have to be shared among GSM and traffcs. As a remnder s a packet swtchng technology over crcut-swtchng based GSM system. In technology a moble staton can use several tme-slots smultaneously for one applcaton data flow to perform ts transmsson wth a hgher throughput. Each tme-slot can be shared among several users by assgnng dfferent Temporary Flow Identtes (TFI) to the mobles. Each TFI dentfes a physcal connecton called Temporary Block Flow (TBF). Up to 32 TFI s can be allocated per TMA frame due to the 5 bts allocated for TFI encodng at TRX level. ata flows are multplexed by a PCU- based schedulng algorthm. In addton to tme-slot parttonng, system allows tme-slot aggregaton: for a sngle moble user the system can allocate up to d- tme-slots smultaneously for downlnk and up to u- tme-slots smultaneously for uplnk, dependng on moble staton capablty class (d+u). The choce of the number of TBF s that a PCH can have n uplnk and downlnk depends on the operator s choce. For example, n Alcatel-Lucent technology up to 6 uplnk and downlnk TBF s are allocated per PCH. Our study s focused on the rado allocator whch dstrbutes the downlnk rado channels among voce calls and data flows. We make the followng assumptons regardng the system to be modeled: - TS : the number of tme-slots of the TMA parttoned nto a contguous set of TS tme-slots dedcated to voce calls, TS tme-slots shared between voce and data and TS tme-slots dedcated to ; tme-slots used by data TS + TS are on a sngle TMA whch has a total of 8 tme-slots. - d (resp. u ): s the number of tme-slots that can be used smultaneously for downlnk (resp. uplnk) traffc. All mobles have the same rado capablty, denoted d + u. - The RLC rado block sze and the data rate accordng to the codng are ndcated n TABLE. TABLE Codng CS- CS-2 CS-3 CS-4 Schemes RLC block rado (bytes) ata rate: μ ( kbts / s ) oce calls have a preemptve prorty over data flows on the shared part of the TMA due to the fact that they generate the largest amount of revenue n most actual operatng systems. As a consequence, f all TS tme-slots dedcated to voce are occuped and all TS tme-slots are n use wth at least one of them allocated to data, then one tmeslot assgned to traffc n the shared part of the TMA wll be reallocated to voce on the arrval of a GSM request. 3 System Model 3. Cells wth Complete Parttonng Strategy Complete Parttonng strategy allows two separate sets of tme-slots dedcated to voce respectvely to data. As a consequence the GSM and systems can be analyzed separately. 3.. oce traffc model The classcal Markov chan model apples for voce. The steady-state voce probabltes gven by relaton () are generated by the brth-death structure of ths model shown n Fg.. ISSN: ISBN:
3 Proceedngs of the 3th WSEAS Internatonal Conference on COMMUNICATIONS t p ()! t = t, t [, TS] TS! () of actve users n progress and represents a fnte state space. λ λ Fg. The brth-death model appled to voce traffc process λ = represents the voce traffc. μ Obvously the Erlang-B [] formula gves the call blockng probablty necessary to dmenson the cell n order to guarantee a mnmum QoS for voce traffc. B, TS TS = TS!! (2) 3..2 ata Traffc Model ata traffc s modeled assumng that there s a fxed number N of data mobles n the cell. Each moble s dong an ON/OFF traffc wth an nfnte number of pages: ON perods correspond to the download of an element lke a WAP, a WEB page, an emal, a fle, etc. Its sze s characterzed by a dscrete random varable X on, wth an average value E[ σ ]. OFF perods correspond to the readng tme of the last downloaded element, whch s modeled as a random varable T off wth an average value of τ seconds. The mum number of users n actve transfer s gven by: n ( TS ) = mn( N,32, mts ) (3) t t t + tμ ( t + ) μ m- s the mum number of users that can use a sngle tme-slot. The system model s based on the Engset model [6] and ncludes partcular specfcatons as ndcated n Fg.2. Ths stochastc process descrbes the number Fg.2 The Engset model appled to data traffc process As can be seen from Fg. 2 the transton rate from state to +, λ, s gven by: λ = ( N ) λ = ( N ), τ for =,, n (4) We can express the transton rate of death process as: μ μ = mn( d, TS) μ = mn( d, TS), E[ σ] (5) for =,, n As ndcated n Fg.2, the state of the Markov chan corresponds to the number of the data mobles that are smultaneously n actve transfer (n ON state). The mum bandwdth capacty they can use sts. Because of the mum downloadng capacty d of each moble, two stuatons can be dstngushed: () If d < TS, the avalable bandwdth s not fully utlzed by data mobles. As a consequence the transton rate from state to state, gven by the accomplshed transfer of one moble, s μ d E [ σ ] ; (2) If d TS the allocator has to share the TS tme-slots among the data mobles and the transton rate from state to state s μ TS E[ σ ] ; Let p ( ) be the steady-state probablty that users are n actve transfer. Accordng to the Engset model t s gven by the closed form here below: p ( ) = p () CN TS μ mn( d, ) E[ σ] τ (6) ISSN: ISBN:
4 Proceedngs of the 3th WSEAS Internatonal Conference on COMMUNICATIONS We can express the steady-state probablty n terms of data traffc, defned by relaton (7): E[ σ] = τ μ CN p ( ) = p () TS mn( d, ) (7) (8) As can be seen the steady-state dstrbuton depends E[ σ] only trough the rato on data traffc τ parameters E[ σ ] and τ. Based on ths dstrbuton we have calculated the average performances of the system. As performance measures the average downlnk throughput per user ( X u ), the average downlnk total throughput ( X ) and the blockng probabltes ( B ) for data are consdered. All these parameters are functon of the load, the avalable cell capacty TS; TS, the user capablty d and the total number N of users. The average total throughput was determned usng the expresson bellow: X = p ( ) r( ) (9) = where r() represents the effectve bandwdth receved by each user: TS r( ) mn( d, ), for,, n = μ = () From formula (9) we derve the average throughput per user: X p( )mn( d, TS ) X = u/ = = μ E[ ] = p( ) () The data blockng probablty can be expressed based on Engset model as follows: CN B = p() n (2) mn( dts, / ) and represents the probablty that TS tme-slots are beng used by n users among the other ( N ) users. 3.2 Cells wth Partal Parttonng Strategy In ths case, the avalable tme slots (TS) of the TMA are parttoned nto TS tme-slots dedcated to voce, TS tme-slots dedcated to data and TS tme slots shared between voce and data wth a total preemptve prorty of voce over data on the shared part as mentoned before n Secton 2. TS = TS + TS + TS (3) 3.2. oce traffc model The voce traffc process s modeled as mentoned before by relaton (). As voce has a preemptve prorty over data, the blockng probablty for voce can be obtaned by Erlang-B formula (because data traffc s transparent to voce), wth a number of resources equal to TS + TS: B ( TS + TS) ( TS = + TS )!, PP TS + TS! (4) oce traffc model The model appled to ths system has to deal wth two traffc processes: voce and data, sharng the same ar nterface and usng the same physcal channels. In our prevous work [] we have mplemented the b-dmensonal model proposed n [8] and have deduced the blockng probabltes formulas accordng to the PP strategy. In ths paper we appled the modfed Engset model proposed n [6] to analyze the performances and to establsh dmensonng rules. The basc dea n constructng the model reles on 2 assumptons: the voce calls are ndependent of connectons and the voce and data traffc evolves at dfferent tme scales. The tme requred to transfer data s about several seconds and should be shorter than the mean call duraton whch s about several mnutes. As a consequence between two varatons of the number of voce calls, the number of data transfers reaches ts statonary regme. For voce calls the steady-state probabltes are gven by relaton () wth the mum number of avalable resources equal to: TS TS. Among the TS tme slots, those not used by the voce calls may be used for data traffc wth a probablty ISSN: ISBN:
5 Proceedngs of the 3th WSEAS Internatonal Conference on COMMUNICATIONS equal to the probablty that TS TS s are used by GSM users: p( TS TS s). The data traffc model s constructed wth respect to the Engset model and the partculartes mposed by the resources sharng capablty as presented above. The total number of avalable resources s gven by: * = mn( N, 32, mts ) (5) * We denoted by TS the avalable cell capacty for data traffc. The average performance parameters are determned as follows: - the average throughput per user can be expressed as [6]: TS TS XuPP / = p( s) Xu / (mn( TS TS, TS s)) (6) dfferent offered voce traffc values:.62, = 2.94 and = 2. The frst two values correspond to the dfferent occupances of the tme-slots that can be used by voce: 3 and 7, consderng n that case a 2% for the lost voce traffc accordng to Erlang-B formula. The thrd traffc value corresponds to 7 voce TS occupancy but wth a blockng probablty closed to 9%. In Fg. 3 we have plotted the total average throughputs X and X PP, the average throughputs per user X u, and X upp, as well as the blockng probabltes B and B PP. = - for the total average throughput we propose the formula: TS TS X = p ( s) X (mn( TS TS, TS s)) (7) PP - the data blockng probablty s deduced smlarly as n [6]: TS TS B = p () s B (mn( TS TS, TS s)) (8) PP - fnally we propose a formula for estmatng the preempton probablty due to voce calls prorty over data users: TS TS BPPP, = p() s B(mn( TS TS, TS s)) (9) TS 4 Experments and results The models have been mplemented by smple programs wrtten n Matlab and varous scenaros were expermented. For the data traffc we have adopted the followng parameters: E[ σ ] = 5KB, E[ τ ] = 2s, moble class: 4+ and CS2 codng scheme ( μ = 3, 4 kbts / s ). In the frst scenaro we have consdered a cell wth strategy, equpped wth a sngle TRX that provdes: TS = 8, TS = 7, and TS =. In the second scenaro we have consdered a cell wth PP strategy, equpped wth a sngle TRX that provdes: TS = 8, TS = 3, and TS =. We have consdered three loadng stuatons, accordng to Fg.3 Performance parameters The PP scheme takes advantages regardng the throughput and the blockng probablty comparng wth scheme. The typcal network dmensonng problem s to compute how many tme-slots to allocate for data traffc. Current used dmensonng rules need to estmate the number of actve users per cell []. Our dmensonng method avods ths estmaton usng dmensonng crtera based on the throughput per actve user combned wth blockng probabltes n an nteractve algorthm. Blockng probabltes n commercally networks must be small enough n order to avod nterrupton caused by TBF reecton. As we can see n Fg 3 for a reasonable number of users n the cell the mnmum accepted throughput s reached, that means that the lmtng factor for dmensonng s the throughput rather then the blockng probablty. To llustrate the proposed rule, n Fg.4 we have ISSN: ISBN:
6 Proceedngs of the 3th WSEAS Internatonal Conference on COMMUNICATIONS plotted as a detal of Fg.3 the throughput per user and the blockng probablty as functon of number of actve users n the cell, for two dfferent total tme-slots values. The same prevous PP scenaro was used for dmensonng algorthm llustraton, except that the ntal value of TS number was set to 7 (3 dedcated for voce, dedcated for data and 3 shared between voce and data). Fg.4 mensonng algorthm llustraton The A pont gves the number of actve users that can obtan a desred throughput value. Accordng to ths number the C pont ndcates the reached blockng probablty. If that probablty s greater that an mposed value, an ncrement of the number of tme slots gves the new users number (pont B) and the correspondng smaller blockng probablty (pont ). The algorthm wll be repeated untl the desred value for blockng probablty s reached. 5 Concluson In our paper we have ntroduced a dmensonng algorthm for GSM/ networks wth PP strategy. The proposed algorthm s based on performance parameters as the average downlnk throughput per user ( X u ), the average downlnk total throughput ( X ) and the blockng probabltes ( B ). All these parameters are functon of the cell load (voce and data), the avalable cell capacty, the user capablty d and the total number of users. As qualty crtera we have consdered the blockng probablty, accordng to Erlang-B law, for voce and the average downlnk throughput per user for data. References: [] L. Klenrock, Queung Systems: ol. I Theory, New-York Wley, 976 [2] S. Pedraza, J. Romero, J. Munoz, (E) Hardware mensonng Rules wth Mnmum Qualty Crtera, Proc. of IEEE TC Sprng, pp , May 22 [3] C. Lndemann, A. Thummler, Performance Analyss of the General Packet Rado Servce, Computer Network, 4, pp. -7, Jan., 23 [4] S. N, S. Haggman, Performance Estmaton n GSM Crcut-Swtched Servces and Shared Resources Systems, WCNC, ol.3, pp.47-42, 999 [5] M. Mahdav, R. Edwards, P. Ivey, Performance Evaluaton of ata Subsystem n GSM/ Usng Complete Sharng, Proc. of London Communcatons Symposum, Unv. College of London, 2 [6] H. ahmoun,. B. Morn, S. aton, Performance Modellng of GSM/ Cells wth fferent Rado Resource Allocaton Strateges, IEEE Wreless Communcatons and Networkng Conference, March 25, olume 3, pp: [7] B. Baynat, K. Boussetta, P. Esenmann, N. Ben Rached, screte-tme Markov Model for EGE/ Rado Engneerng wth Fntelength Sessons, Int. Symp. On Performance Evaluaton of Computer and Telecommuncaton Systems (SPECTS 24), San Jose, Calforna, USA, July, 24 [8] B. Baynat, K. Boussetta, P. Esenmann, N. Ben Rached, Towards an Erlang-lke Law for the Performance Evaluaton of /EGE Networks wth Fnte-Length Sessons, Proc. of 3 rd IFIP-TC6 Networkng Conference, May 24, pp [9] B. Baynat, P. Esenmann, Towards an Erlanglke law for /EGE network engneerng, Proceedngs IEEE ICC, June 24 []G. Budura, C. Balnt, E. Marza, Blockng Probabltes n GSM/(E) Cells wth fferent Rado Resources Allocaton Strateges, Scentfc Bulletn of Poltehnca Unversty of Tmsoara, Electronc and Telecommuncaton seres, Tom 53(67), Fasc.2, 28, pp []P. Stuckmann, O. Paul, mensonng GSM/ Networks for Crcut- and Packet- Swtched Servces, Proceedngs of the th Symposum on Wreless Personal Communcatons, Aalborg, enmark, 2, pp ISSN: ISBN:
Calculation of the received voltage due to the radiation from multiple co-frequency sources
Rec. ITU-R SM.1271-0 1 RECOMMENDATION ITU-R SM.1271-0 * EFFICIENT SPECTRUM UTILIZATION USING PROBABILISTIC METHODS Rec. ITU-R SM.1271 (1997) The ITU Radocommuncaton Assembly, consderng a) that communcatons
More informationComparative Analysis of Reuse 1 and 3 in Cellular Network Based On SIR Distribution and Rate
Comparatve Analyss of Reuse and 3 n ular Network Based On IR Dstrbuton and Rate Chandra Thapa M.Tech. II, DEC V College of Engneerng & Technology R.V.. Nagar, Chttoor-5727, A.P. Inda Emal: chandra2thapa@gmal.com
More informationUncertainty in measurements of power and energy on power networks
Uncertanty n measurements of power and energy on power networks E. Manov, N. Kolev Department of Measurement and Instrumentaton, Techncal Unversty Sofa, bul. Klment Ohrdsk No8, bl., 000 Sofa, Bulgara Tel./fax:
More informationModelling Service Time Distribution in Cellular Networks Using Phase-Type Service Distributions
Modellng Servce Tme Dstrbuton n Cellular Networks Usng Phase-Type Servce Dstrbutons runa Jayasurya, Davd Green, John senstorfer Insttute for Telecommuncaton Research, Cooperatve Research Centre for Satellte
More informationResource Allocation Optimization for Device-to- Device Communication Underlaying Cellular Networks
Resource Allocaton Optmzaton for Devce-to- Devce Communcaton Underlayng Cellular Networks Bn Wang, L Chen, Xaohang Chen, Xn Zhang, and Dacheng Yang Wreless Theores and Technologes (WT&T) Bejng Unversty
More informationPriority based Dynamic Multiple Robot Path Planning
2nd Internatonal Conference on Autonomous obots and Agents Prorty based Dynamc Multple obot Path Plannng Abstract Taxong Zheng Department of Automaton Chongqng Unversty of Post and Telecommuncaton, Chna
More informationDynamic Optimization. Assignment 1. Sasanka Nagavalli January 29, 2013 Robotics Institute Carnegie Mellon University
Dynamc Optmzaton Assgnment 1 Sasanka Nagavall snagaval@andrew.cmu.edu 16-745 January 29, 213 Robotcs Insttute Carnege Mellon Unversty Table of Contents 1. Problem and Approach... 1 2. Optmzaton wthout
More informationAMC-aware QoS proposal for OFDMA-based IEEE WiMAX systems
AMC-aware QoS proposal for OFDMA-based IEEE82.6 WMAX systems Chad Tarhn, Tjan Chahed GET/Insttut Natonal des Télécommuncatons/UMR CNRS 557 9 rue C. Fourer - 9 Evry CEDEX - France {chad.tarhn, tjan.chahed}@nt-evry.fr
More informationMTBF PREDICTION REPORT
MTBF PREDICTION REPORT PRODUCT NAME: BLE112-A-V2 Issued date: 01-23-2015 Rev:1.0 Copyrght@2015 Bluegga Technologes. All rghts reserved. 1 MTBF PREDICTION REPORT... 1 PRODUCT NAME: BLE112-A-V2... 1 1.0
More informationEnhanced Uplink Scheduling for Continuous Connectivity in High Speed Packet Access Systems
Int. J. Communcatons, Network and System Scences, 212, 5, 446-453 http://dx.do.org/1.4236/jcns.212.5855 Publshed Onlne August 212 (http://www.scrp.org/journal/jcns) Enhanced Uplnk Schedulng for Contnuous
More informationEnergy Efficiency Analysis of a Multichannel Wireless Access Protocol
Energy Effcency Analyss of a Multchannel Wreless Access Protocol A. Chockalngam y, Wepng u, Mchele Zorz, and Laurence B. Mlsten Department of Electrcal and Computer Engneerng, Unversty of Calforna, San
More informationResource Control for Elastic Traffic in CDMA Networks
Resource Control for Elastc Traffc n CDMA Networks Vaslos A. Srs Insttute of Computer Scence, FORTH Crete, Greece vsrs@cs.forth.gr ACM MobCom 2002 Sep. 23-28, 2002, Atlanta, U.S.A. Funded n part by BTexact
More informationRESOURCE CONTROL FOR HYBRID CODE AND TIME DIVISION SCHEDULING
RESOURCE CONTROL FOR HYBRID CODE AND TIME DIVISION SCHEDULING Vaslos A. Srs Insttute of Computer Scence (ICS), FORTH and Department of Computer Scence, Unversty of Crete P.O. Box 385, GR 7 Heraklon, Crete,
More informationHarmonic Balance of Nonlinear RF Circuits
MICROWAE AND RF DESIGN Harmonc Balance of Nonlnear RF Crcuts Presented by Mchael Steer Readng: Chapter 19, Secton 19. Index: HB Based on materal n Mcrowave and RF Desgn: A Systems Approach, nd Edton, by
More informationDistributed Channel Allocation Algorithm with Power Control
Dstrbuted Channel Allocaton Algorthm wth Power Control Shaoj N Helsnk Unversty of Technology, Insttute of Rado Communcatons, Communcatons Laboratory, Otakaar 5, 0150 Espoo, Fnland. E-mal: n@tltu.hut.f
More informationIndex Terms Adaptive modulation, Adaptive FEC, Packet Error Rate, Performance.
ANALYTICAL COMPARISON OF THE PERFORMANCE OF ADAPTIVE MODULATION AND CODING IN WIRELESS NETWORK UNDER RAYLEIGH FADING 723 Sab Y.M. BANDIRI, Rafael M.S. BRAGA and Danlo H. SPADOTI Federal Unversty of Itajubá
More informationJoint Power Control and Scheduling for Two-Cell Energy Efficient Broadcasting with Network Coding
Communcatons and Network, 2013, 5, 312-318 http://dx.do.org/10.4236/cn.2013.53b2058 Publshed Onlne September 2013 (http://www.scrp.org/journal/cn) Jont Power Control and Schedulng for Two-Cell Energy Effcent
More informationStudy of Downlink Radio Resource Allocation Scheme with Interference Coordination in LTE A Network
Internatonal Journal of Future Computer and Communcaton, Vol. 6, o. 3, September 2017 Study of Downln Rado Resource Allocaton Scheme wth Interference Coordnaton n LTE A etwor Yen-Wen Chen and Chen-Ju Chen
More informationOn capacity of OFDMA-based IEEE WiMAX including Adaptive Modulation and Coding (AMC) and inter-cell interference
1 On capacty of OFDMA-based IEEE802.16 WMAX ncludng Adaptve Modulaton and Codng (AMC) and nter-cell nterference Chad Tarhn, Tjan Chahed GET/Insttut Natonal des Télécommuncatons - UMR CNRS 5157 9 rue C.
More informationThe Stability Region of the Two-User Broadcast Channel
The Stablty Regon of the Two-User Broadcast Channel Nkolaos appas *, Maros Kountours, * Department of Scence and Technology, Lnköpng Unversty, Campus Norrköpng, 60 74, Sweden Mathematcal and Algorthmc
More informationMODEL OF I UB INTERAFCE IN THE UMTS NETWORK
POZNAN UNIVERSITY OF TECHNOLOGY ACADEMIC JOURNALS Macej STASIAK* Janusz WIEWIÓRA** Potr ZWIERZYKOWSKI* 2007 Poznańske Warsztaty Telekomunkacyjne Poznań 6-7 grudna 2007 MODEL OF I UB INTERAFCE IN THE UMTS
More informationResearch Article Performance Evaluation of Uplink Delay-Tolerant Packet Service in IEEE Based Networks
Hndaw Publshng Corporaton EURASIP Journal on Wreless Communcatons and Networkng Volume 2011, Artcle ID 549492, 12 pages do:10.1155/2011/549492 Research Artcle Performance Evaluaton of Uplnk Delay-Tolerant
More informationQoS Provisioning in Wireless Data Networks under Non-Continuously Backlogged Users
os Provsonng n Wreless Data Networks under Non-Contnuously Backlogged Users Tmotheos Kastrnoganns, and Symeon Papavasslou, Member, IEEE School of Electrcal and Computer Engneerng Natonal Techncal Unversty
More informationResearch of Dispatching Method in Elevator Group Control System Based on Fuzzy Neural Network. Yufeng Dai a, Yun Du b
2nd Internatonal Conference on Computer Engneerng, Informaton Scence & Applcaton Technology (ICCIA 207) Research of Dspatchng Method n Elevator Group Control System Based on Fuzzy Neural Network Yufeng
More informationTo: Professor Avitabile Date: February 4, 2003 From: Mechanical Student Subject: Experiment #1 Numerical Methods Using Excel
To: Professor Avtable Date: February 4, 3 From: Mechancal Student Subject:.3 Experment # Numercal Methods Usng Excel Introducton Mcrosoft Excel s a spreadsheet program that can be used for data analyss,
More informationResource Scheduling in Dependable Integrated Modular Avionics
Resource Schedulng n Dependable Integrated Modular Avoncs Yann-Hang Lee and Daeyoung Km Real Tme Systems Research Laboratory CISE Department, Unversty of Florda {yhlee, dkm}@cse.ufl.edu Mohamed Youns,
More informationDigital Transmission
Dgtal Transmsson Most modern communcaton systems are dgtal, meanng that the transmtted normaton sgnal carres bts and symbols rather than an analog sgnal. The eect o C/N rato ncrease or decrease on dgtal
More informationIEE Electronics Letters, vol 34, no 17, August 1998, pp ESTIMATING STARTING POINT OF CONDUCTION OF CMOS GATES
IEE Electroncs Letters, vol 34, no 17, August 1998, pp. 1622-1624. ESTIMATING STARTING POINT OF CONDUCTION OF CMOS GATES A. Chatzgeorgou, S. Nkolads 1 and I. Tsoukalas Computer Scence Department, 1 Department
More informationRedes de Comunicação em Ambientes Industriais Aula 8
Redes de Comuncação em Ambentes Industras Aula 8 Luís Almeda lda@det.ua.pt Electronc Systems Lab-IEETA / DET Unversdade de Avero Avero, Portugal RCAI 2005/2006 1 In the prevous epsode... Cooperaton models:
More informationA Fuzzy-based Routing Strategy for Multihop Cognitive Radio Networks
74 Internatonal Journal of Communcaton Networks and Informaton Securty (IJCNIS) Vol. 3, No., Aprl 0 A Fuzzy-based Routng Strategy for Multhop Cogntve Rado Networks Al El Masr, Naceur Malouch and Hcham
More informationThe Impact of Spectrum Sensing Frequency and Packet- Loading Scheme on Multimedia Transmission over Cognitive Radio Networks
Ths artcle has been accepted for publcaton n a future ssue of ths journal, but has not been fully edted. Content may change pror to fnal publcaton. The Impact of Spectrum Sensng Frequency and Pacet- Loadng
More informationThroughput Maximization by Adaptive Threshold Adjustment for AMC Systems
APSIPA ASC 2011 X an Throughput Maxmzaton by Adaptve Threshold Adjustment for AMC Systems We-Shun Lao and Hsuan-Jung Su Graduate Insttute of Communcaton Engneerng Department of Electrcal Engneerng Natonal
More informationKeywords LTE, Uplink, Power Control, Fractional Power Control.
Volume 3, Issue 6, June 2013 ISSN: 2277 128X Internatonal Journal of Advanced Research n Computer Scence and Software Engneerng Research Paper Avalable onlne at: www.jarcsse.com Uplnk Power Control Schemes
More informationantenna antenna (4.139)
.6.6 The Lmts of Usable Input Levels for LNAs The sgnal voltage level delvered to the nput of an LNA from the antenna may vary n a very wde nterval, from very weak sgnals comparable to the nose level,
More informationApproximating User Distributions in WCDMA Networks Using 2-D Gaussian
CCCT 05: INTERNATIONAL CONFERENCE ON COMPUTING, COMMUNICATIONS, AND CONTROL TECHNOLOGIES 1 Approxmatng User Dstrbutons n CDMA Networks Usng 2-D Gaussan Son NGUYEN and Robert AKL Department of Computer
More informationDefine Y = # of mobiles from M total mobiles that have an adequate link. Measure of average portion of mobiles allocated a link of adequate quality.
Wreless Communcatons Technologes 6::559 (Advanced Topcs n Communcatons) Lecture 5 (Aprl th ) and Lecture 6 (May st ) Instructor: Professor Narayan Mandayam Summarzed by: Steve Leung (leungs@ece.rutgers.edu)
More informationGraph Method for Solving Switched Capacitors Circuits
Recent Advances n rcuts, ystems, gnal and Telecommuncatons Graph Method for olvng wtched apactors rcuts BHUMIL BRTNÍ Department of lectroncs and Informatcs ollege of Polytechncs Jhlava Tolstého 6, 586
More informationAnalysis of Time Delays in Synchronous and. Asynchronous Control Loops. Bj rn Wittenmark, Ben Bastian, and Johan Nilsson
37th CDC, Tampa, December 1998 Analyss of Delays n Synchronous and Asynchronous Control Loops Bj rn Wttenmark, Ben Bastan, and Johan Nlsson emal: bjorn@control.lth.se, ben@control.lth.se, and johan@control.lth.se
More informationEvaluate the Effective of Annular Aperture on the OTF for Fractal Optical Modulator
Global Advanced Research Journal of Management and Busness Studes (ISSN: 2315-5086) Vol. 4(3) pp. 082-086, March, 2015 Avalable onlne http://garj.org/garjmbs/ndex.htm Copyrght 2015 Global Advanced Research
More informationAn Application-Aware Spectrum Sharing Approach for Commercial Use of 3.5 GHz Spectrum
An Applcaton-Aware Spectrum Sharng Approach for Commercal Use of 3.5 GHz Spectrum Haya Shajaah, Ahmed Abdelhad and Charles Clancy Bradley Department of Electrcal and Computer Engneerng Hume Center, Vrgna
More informationTraffic balancing over licensed and unlicensed bands in heterogeneous networks
Correspondence letter Traffc balancng over lcensed and unlcensed bands n heterogeneous networks LI Zhen, CUI Qme, CUI Zhyan, ZHENG We Natonal Engneerng Laboratory for Moble Network Securty, Bejng Unversty
More informationCoexistence Evaluation of LTE with Active Antenna System
Communcatons and etwork 013 5 17- http://dx.do.org/10.436/cn.013.53b041 Publshed Onlne September 013 (http://www.scrp.org/journal/cn) Coexstence valuaton of LT wth Actve Antenna System Fe Xue Qme Cu Tng
More informationDistributed Uplink Scheduling in EV-DO Rev. A Networks
Dstrbuted Uplnk Schedulng n EV-DO ev. A Networks Ashwn Srdharan (Sprnt Nextel) amesh Subbaraman, och Guérn (ESE, Unversty of Pennsylvana) Overvew of Problem Most modern wreless systems Delver hgh performance
More informationSecure Transmission of Sensitive data using multiple channels
Secure Transmsson of Senstve data usng multple channels Ahmed A. Belal, Ph.D. Department of computer scence and automatc control Faculty of Engneerng Unversty of Alexandra Alexandra, Egypt. aabelal@hotmal.com
More informationSelective Sensing and Transmission for Multi-Channel Cognitive Radio Networks
IEEE INFOCOM 2 Workshop On Cogntve & Cooperatve Networks Selectve Sensng and Transmsson for Mult-Channel Cogntve Rado Networks You Xu, Yunzhou L, Yfe Zhao, Hongxng Zou and Athanasos V. Vaslakos Insttute
More informationAN ALGORITHM TO COMBINE LINK ADAPTATION AND TRANSMIT POWER CONTROL IN HIPERLAN TYPE 2
AN ALGORITHM TO COMBINE LINK ADAPTATION AND TRANSMIT POWER CONTROL IN HIPERLAN TYPE 2 Markus Radmrsch Inst. f. Allgem. Nachrchtentechnk, Unv. Hannover, Appelstr. 9a, 3167 Hannover, Germany Tel.: +49-511-762
More informationQoS-Based Performance and Resource Management in 3G Wireless Networks in Realistic Environments
The Internatonal Arab Journal of Informaton Technology, Vol. 1, o. 1, January 213 1 QoS-Based Performance and Resource Management n 3G Wreless etworks n Realstc Envronments Aymen Issa Zrekat Department
More informationHigh Speed, Low Power And Area Efficient Carry-Select Adder
Internatonal Journal of Scence, Engneerng and Technology Research (IJSETR), Volume 5, Issue 3, March 2016 Hgh Speed, Low Power And Area Effcent Carry-Select Adder Nelant Harsh M.tech.VLSI Desgn Electroncs
More information熊本大学学術リポジトリ. Kumamoto University Repositor
熊本大学学術リポジトリ Kumamoto Unversty Repostor Ttle Wreless LAN Based Indoor Poston and Its Smulaton Author(s) Ktasuka, Teruak; Nakansh, Tsune CtatonIEEE Pacfc RIM Conference on Comm Computers, and Sgnal Processng
More informationRejection of PSK Interference in DS-SS/PSK System Using Adaptive Transversal Filter with Conditional Response Recalculation
SERBIAN JOURNAL OF ELECTRICAL ENGINEERING Vol., No., November 23, 3-9 Rejecton of PSK Interference n DS-SS/PSK System Usng Adaptve Transversal Flter wth Condtonal Response Recalculaton Zorca Nkolć, Bojan
More informationControl Chart. Control Chart - history. Process in control. Developed in 1920 s. By Dr. Walter A. Shewhart
Control Chart - hstory Control Chart Developed n 920 s By Dr. Walter A. Shewhart 2 Process n control A phenomenon s sad to be controlled when, through the use of past experence, we can predct, at least
More informationANNUAL OF NAVIGATION 11/2006
ANNUAL OF NAVIGATION 11/2006 TOMASZ PRACZYK Naval Unversty of Gdyna A FEEDFORWARD LINEAR NEURAL NETWORK WITH HEBBA SELFORGANIZATION IN RADAR IMAGE COMPRESSION ABSTRACT The artcle presents the applcaton
More informationQueuing-Based Dynamic Channel Selection for Heterogeneous Multimedia Applications over Cognitive Radio Networks
1 Queung-Based Dynamc Channel Selecton for Heterogeneous ultmeda Applcatons over Cogntve Rado Networks Hsen-Po Shang and haela van der Schaar Department of Electrcal Engneerng (EE), Unversty of Calforna
More informationReview: Our Approach 2. CSC310 Information Theory
CSC30 Informaton Theory Sam Rowes Lecture 3: Provng the Kraft-McMllan Inequaltes September 8, 6 Revew: Our Approach The study of both compresson and transmsson requres that we abstract data and messages
More informationTopology Control for C-RAN Architecture Based on Complex Network
Topology Control for C-RAN Archtecture Based on Complex Network Zhanun Lu, Yung He, Yunpeng L, Zhaoy L, Ka Dng Chongqng key laboratory of moble communcatons technology Chongqng unversty of post and telecommuncaton
More informationEvaluating Different One to Many Packet Delivery Schemes for UMTS
Evaluatng Dfferent One to Many Packet Delvery Schemes for UMTS Antonos Alexou, Dmtros Antonells, Chrstos Bouras Research Academc Computer Technology Insttute, Greece and Computer Engneerng and Informatcs
More informationOn Operational Availability of a Large Software-Based Telecommunications System
On Operatonal Avalablty of a Large Software-Based Telecommuncatons System Randy Cramp and Mladen A. Vouk Wendell Jones North Carolna State Unversty BNR Inc. Department of Computer Scence, Box 826 P.O.
More informationControl of Chaos in Positive Output Luo Converter by means of Time Delay Feedback
Control of Chaos n Postve Output Luo Converter by means of Tme Delay Feedback Nagulapat nkran.ped@gmal.com Abstract Faster development n Dc to Dc converter technques are undergong very drastc changes due
More informationCOMPARISON OF DIFFERENT BROADCAST SCHEMES FOR MULTI-HOP WIRELESS SENSOR NETWORKS 1
Internatonal Journal of Computer Networks & Communcatons (IJCNC), Vol., No.4, July 1 COMARISON OF DIFFERENT BROADCAST SCHEMES FOR MULTI-HO WIRELESS SENSOR NETWORKS 1 S. Mehta and K.S. Kwak UWB Wreless
More information10 9 Channel on time. sec
Blockng of dynamc multcast connectons n a sngle lnk COST 257TD(97)46 Joun Karvo 1, Jorma Vrtamo 2, Samul Aalto 2, Oll Martkanen 1 fjoun.karvo,jorma.vrtamo,samul.aalto,oll.martkaneng@hut.f Helsnk Unversty
More informationClustering Based Fractional Frequency Reuse and Fair Resource Allocation in Multi-cell Networks
Ths full text paper was peer revewed at the drecton of IEEE Communcatons Socety subject matter experts for publcaton n the IEEE ICC 21 proceedngs Clusterng Based Fractonal Frequency Reuse and Far Resource
More informationThe Spectrum Sharing in Cognitive Radio Networks Based on Competitive Price Game
8 Y. B. LI, R. YAG, Y. LI, F. YE, THE SPECTRUM SHARIG I COGITIVE RADIO ETWORKS BASED O COMPETITIVE The Spectrum Sharng n Cogntve Rado etworks Based on Compettve Prce Game Y-bng LI, Ru YAG., Yun LI, Fang
More informationProviding Strict Quality of Service in HSDPA for real time services
Provdng Strct Qualty of Servce n HSDPA for real tme servces Joseph S. Gomes, Mra Yun, Hyeong-Ah Cho, Jae-Hoon Km 2, JungKyo Sohn 3, Hyeong-In Cho 3 Department of Computer Scence, George Washngton Unversty,
More informationSpace Time Equalization-space time codes System Model for STCM
Space Tme Eualzaton-space tme codes System Model for STCM The system under consderaton conssts of ST encoder, fadng channel model wth AWGN, two transmt antennas, one receve antenna, Vterb eualzer wth deal
More informationExact Probabilistic Analysis of the Limited Scheduling Algorithm for Symmetrical Bluetooth Piconets
Exact Probablstc Analyss of the Lmted Schedulng Algorthm for Symmetrcal Bluetooth Pconets Gl Zussman *, Ur Yechal 2, and Adran Segall Department of Electrcal Engneerng Technon Israel Insttute of Technology,
More informationModelling Overflow Traffic from Terrestrial Networks into Satellite Networks
Modellng Overflow Traffc from Terrestral Networks nto Satellte Networks runa Jayasurya, Davd Green, John senstorfer Insttute for Telecommuncaton Research, Cooperatve Research Centre for Satellte Systems,
More informationAN IMPROVED BIT LOADING TECHNIQUE FOR ENHANCED ENERGY EFFICIENCY IN NEXT GENERATION VOICE/VIDEO APPLICATIONS
Journal of Engneerng Scence and Technology Vol., o. 4 (6) 476-495 School of Engneerng, Taylor s Unversty A IMPROVED BIT LOADIG TECHIQUE FOR EHACED EERGY EFFICIECY I EXT GEERATIO VOICE/VIDEO APPLICATIOS
More informationA Comparison of Two Equivalent Real Formulations for Complex-Valued Linear Systems Part 2: Results
AMERICAN JOURNAL OF UNDERGRADUATE RESEARCH VOL. 1 NO. () A Comparson of Two Equvalent Real Formulatons for Complex-Valued Lnear Systems Part : Results Abnta Munankarmy and Mchael A. Heroux Department of
More informationELECTRONIC WAVELENGTH TRANSLATION IN OPTICAL NETWORKS. Milan Kovacevic and Anthony Acampora. Center for Telecommunications Research
ELECTRONIC WAVELENGTH TRANSLATION IN OPTICAL NETWORKS Mlan Kovacevc Anthony Acampora Department of Electrcal Engneerng Center for Telecommuncatons Research Columba Unversty, New York, NY 0027-6699 Abstract
More informationA study of turbo codes for multilevel modulations in Gaussian and mobile channels
A study of turbo codes for multlevel modulatons n Gaussan and moble channels Lamne Sylla and Paul Forter (sylla, forter)@gel.ulaval.ca Department of Electrcal and Computer Engneerng Laval Unversty, Ste-Foy,
More informationApproximating Blocking Rates in UMTS Radio Networks
Approxmatng s n UMTS Rado Networks Dplomarbet vorgelegt von Franzska Ryll Matrkel-Nr.: 19 88 98 be Prof. Dr. Martn Grötschel Technsche Unverstät Berln Fakultät II: Mathematk und Naturwssenschaften Insttut
More informationD-STATCOM Optimal Allocation Based On Investment Decision Theory
Internatonal Conference on Computer Engneerng, Informaton Scence & Applcaton Technology (ICCIA 2016) D-STATCOM Optmal Allocaton Based On Investment Decson Theory Yongjun Zhang1, a, Yfu Mo1, b and Huazhen
More informationGeneralized Incomplete Trojan-Type Designs with Unequal Cell Sizes
Internatonal Journal of Theoretcal & Appled Scences 6(1): 50-54(2014) ISSN No. (Prnt): 0975-1718 ISSN No. (Onlne): 2249-3247 Generalzed Incomplete Trojan-Type Desgns wth Unequal Cell Szes Cn Varghese,
More informationPerformance Evaluation of QoS Parameters in Dynamic Spectrum Sharing for Heterogeneous Wireless Communication Networks
IJCSI Internatonal Journal of Computer Scence Issues, Vol. 9, Issue 1, No 2, January 2012 ISSN (Onlne): 1694-0814 www.ijcsi.org 81 Performance Evaluaton of QoS Parameters n Dynamc Spectrum Sharng for Heterogeneous
More informationLow Switching Frequency Active Harmonic Elimination in Multilevel Converters with Unequal DC Voltages
Low Swtchng Frequency Actve Harmonc Elmnaton n Multlevel Converters wth Unequal DC Voltages Zhong Du,, Leon M. Tolbert, John N. Chasson, Hu L The Unversty of Tennessee Electrcal and Computer Engneerng
More informationDYNAMIC SYSTEM LEVEL PERFORMANCE FOR MC-CDMA SCHEME J. Rodriguez, X.Yang, D. Mavrakis, R. Tafazolli* D.T. Phan Huy**
DYNAMC SYSEM EVE PEFOMANCE FO MC-CDMA SCHEME J. odrguez, X.Yang, D. Mavraks,. afazoll* D.. Phan Huy** *Centre for Communcaton Systems esearch, Un. of Surrey, uldford, Surrey. UK e-mal: J..odrguez@surrey.ac.uk
More informationAdaptive System Control with PID Neural Networks
Adaptve System Control wth PID Neural Networs F. Shahra a, M.A. Fanae b, A.R. Aromandzadeh a a Department of Chemcal Engneerng, Unversty of Sstan and Baluchestan, Zahedan, Iran. b Department of Chemcal
More informationA New Type of Weighted DV-Hop Algorithm Based on Correction Factor in WSNs
Journal of Communcatons Vol. 9, No. 9, September 2014 A New Type of Weghted DV-Hop Algorthm Based on Correcton Factor n WSNs Yng Wang, Zhy Fang, and Ln Chen Department of Computer scence and technology,
More informationMedium Access Control for Multi-Channel Parallel Transmission in Cognitive Radio Networks
Medum ccess Control for Mult-Channel Parallel Transmsson n Cogntve Rado Networs Tao Shu, Shuguang Cu, and Marwan Krunz Department of Electrcal and Computer Engneerng Unversty of rzona Tucson, Z 85721 {tshu,
More informationPRACTICAL, COMPUTATION EFFICIENT HIGH-ORDER NEURAL NETWORK FOR ROTATION AND SHIFT INVARIANT PATTERN RECOGNITION. Evgeny Artyomov and Orly Yadid-Pecht
68 Internatonal Journal "Informaton Theores & Applcatons" Vol.11 PRACTICAL, COMPUTATION EFFICIENT HIGH-ORDER NEURAL NETWORK FOR ROTATION AND SHIFT INVARIANT PATTERN RECOGNITION Evgeny Artyomov and Orly
More informationParameter Free Iterative Decoding Metrics for Non-Coherent Orthogonal Modulation
1 Parameter Free Iteratve Decodng Metrcs for Non-Coherent Orthogonal Modulaton Albert Gullén Fàbregas and Alex Grant Abstract We study decoder metrcs suted for teratve decodng of non-coherently detected
More informationHUAWEI TECHNOLOGIES CO., LTD. Huawei Proprietary Page 1
Project Ttle Date Submtted IEEE 802.16 Broadband Wreless Access Workng Group Double-Stage DL MU-MIMO Scheme 2008-05-05 Source(s) Yang Tang, Young Hoon Kwon, Yajun Kou, Shahab Sanaye,
More informationHardware Design of Filter Bank-Based Narrowband/Wideband Interference Canceler for Overlaid TDMA/CDMA Systems
Hardware Desgn of Flter anased arrowband/deband Interference Canceler for Overlad TDMA/CDMA Systems Toyoau Ktano Kaunor Hayash Htosh Masutan and Shnsue Hara Graduate School of Engneerng Osaa Unversty YamadaOa
More informationPerformance Analysis of Multi User MIMO System with Block-Diagonalization Precoding Scheme
Performance Analyss of Mult User MIMO System wth Block-Dagonalzaton Precodng Scheme Yoon Hyun m and Jn Young m, wanwoon Unversty, Department of Electroncs Convergence Engneerng, Wolgye-Dong, Nowon-Gu,
More informationAn Efficient Scheduling For Diverse QoS Requirements in WiMAX
An Effcent Schedulng For Dverse QoS Requrements n WMAX by Xaojng Meng A thess presented to the Unversty of Waterloo n fulfllment of the thess requrement for the degree of Master of Appled Scence n Electrcal
More informationTODAY S wireless networks are characterized as a static
IEEE TRANSACTIONS ON MOBILE COMPUTING, VOL. 10, NO. 2, FEBRUARY 2011 161 A Spectrum Decson Framework for Cogntve Rado Networks Won-Yeol Lee, Student Member, IEEE, and Ian F. Akyldz, Fellow, IEEE Abstract
More information>>> SOLUTIONS <<< 5 pts each sub-problem. 3 pts for correct formulas and set-up for each sub-problem.
Comprehensve Fnal Exam for Computer Networks (CNT 65) Fall >>> SOLUTIONS
More information@IJMTER-2015, All rights Reserved 383
SIL of a Safety Fuzzy Logc Controller 1oo usng Fault Tree Analyss (FAT and realablty Block agram (RB r.-ing Mohammed Bsss 1, Fatma Ezzahra Nadr, Prof. Amam Benassa 3 1,,3 Faculty of Scence and Technology,
More informationADAPTIVE CALL ADMISSION CONTROL IN TDD-CDMA CELLULAR WIRELESS NETWORKS
ADAPTVE CALL ADMSSON CONTROL N TDD-CDMA CELLULAR WRELESS NETWORKS Dhananjay Kumar 1, Chellappan C 2 1 Department of nformaton Technology, Anna Unversty, Chenna 1 dhananjay@annaunv.edu 2 Department of Computer
More informationAllocation of QoS Connections in MF-TDMA Satellite Systems: A Two-Phase Approach
VT-22-364.R Allocaton of QoS Connectons n MF-TDMA Satellte Systems: A Two-Phase Approach Jung-Mn Park, Member, IEEE, Uday Savagaonkar, Edwn K. P. Chong, Fellow, IEEE, Howard Jay Segel, Fellow, IEEE, and
More informationTECHNICAL NOTE TERMINATION FOR POINT- TO-POINT SYSTEMS TN TERMINATON FOR POINT-TO-POINT SYSTEMS. Zo = L C. ω - angular frequency = 2πf
TECHNICAL NOTE TERMINATION FOR POINT- TO-POINT SYSTEMS INTRODUCTION Because dgtal sgnal rates n computng systems are ncreasng at an astonshng rate, sgnal ntegrty ssues have become far more mportant to
More informationFigure 1. DC-DC Boost Converter
EE46, Power Electroncs, DC-DC Boost Converter Verson Oct. 3, 11 Overvew Boost converters make t possble to effcently convert a DC voltage from a lower level to a hgher level. Theory of Operaton Relaton
More informationInformation-Theoretic Comparison of Channel Capacity for FDMA and DS-CDMA in a Rayleigh Fading Environment
WSEAS TRANSATIONS on OMMUNIATIONS Informaton-Theoretc omparson of hannel apacty for FDMA and DS-DMA n a Raylegh Fadng Envronment PANAGIOTIS VARZAAS Department of Electroncs Technologcal Educatonal Insttute
More informationEstimation of spectrum requirements for mobile networks with self-similar traffic, handover, and frequency reuse
Moble Informaton Systems 6 (2010) 281 291 281 DOI 10.3233/MIS-2010-0104 IOS Press Estmaton of spectrum requrements for moble networks wth self-smlar traffc, handover, and frequency reuse Won Seok Yang
More informationIN case of bursty data sources, multiple access schemes
Token Enabled Multple Access (TEMA) for Packet Transmsson n Hgh t Rate Wreless Local Area etworks Saed Akhavan Taher Elecrcal & Computer Eng. Dept., Unversty of ew Mexco Emal: saed@eece.unm.edu Anna Scaglone
More informationHigh Speed ADC Sampling Transients
Hgh Speed ADC Samplng Transents Doug Stuetzle Hgh speed analog to dgtal converters (ADCs) are, at the analog sgnal nterface, track and hold devces. As such, they nclude samplng capactors and samplng swtches.
More informationMulticast Transmission Protocol for Multimedia Services in Smart Home
Multcast Transmsson rotocol for Multmeda Servces n Smart Home Jeong-Jun Suh, Shan Guo Quan, Jong-Ku ar, Jong Hyu ar 3 and Young Yong Km Department of Electrcal and Electronc Engneerng, Yonse nversty 34
More informationPassive Filters. References: Barbow (pp ), Hayes & Horowitz (pp 32-60), Rizzoni (Chap. 6)
Passve Flters eferences: Barbow (pp 6575), Hayes & Horowtz (pp 360), zzon (Chap. 6) Frequencyselectve or flter crcuts pass to the output only those nput sgnals that are n a desred range of frequences (called
More informationExploiting Dynamic Workload Variation in Low Energy Preemptive Task Scheduling
Explotng Dynamc Worload Varaton n Low Energy Preemptve Tas Schedulng Lap-Fa Leung, Ch-Yng Tsu Department of Electrcal and Electronc Engneerng Hong Kong Unversty of Scence and Technology Clear Water Bay,
More informationResearch Article Modeling and Performance Analyses of Hybrid Cellular and Broadcasting Networks
Internatonal Journal of Dgtal Multmeda Broadcastng Volume 29, Artcle ID 32973, 9 pages do:.55/29/32973 Research Artcle Modelng and Performance Analyses of Hybrd Cellular and Broadcastng Networks Peter
More information