Performance Evaluation of Layer Adaptive Multi-User Scheduling in LTE-A Downlink
|
|
- Lionel Watson
- 6 years ago
- Views:
Transcription
1 01 7th Internatonal ICST Conference on Communcatons and Networng n Chna (CHINACOM) Performance Evaluaton of Layer Adaptve Mult-User Schedulng n LTE-A Downln L Zhang, Sov Peter, Chunye Wang Chna Industral Envronment, Chef Technology Offce, Noa Semens Networs, Bejng, Chna l.7.zhang@nsn.com; peter.sov@nsn.com; chunye.wang@nsn.com Abstract Mult-user MIMO s an mportant technque to utlze the spatal degree of freedom brought by multple antennas at the transmtter. To be employed n the downln of practcal systems, some sub-optmal algorthms have to be developed to handle the user selecton and precodng wth lmted feedbac on channel state nformaton and reasonable computatonal complexty at a base staton. In ths paper we evaluate the performance of a specfc mult-user schedulng algorthm, whch selects users one by one wth greedy search and results n a scheduled user set wth adaptve sze. The performance s compared wth tradtonal two-user schedulng algorthm n sngle-cell, and we also show the performance of Coordnated Mult-Pont transmsson wth the layer adaptve algorthm by applyng t to users from multple cells. The system level smulaton s based on 3GPP LTE-A framewor, and the evaluaton can be used as gudance for concrete scheduler desgn. Key Words mult-user MIMO, user schedulng, Coordnated Mult-Pont transmsson, LTE-A I. INTRODUCTION Mult-user MIMO has been a hot topc for both research and ndustral lteratures n recent years. The basc dea s to transmt multple data streams to dfferent users (recevers) on the same tme-frequency resource. As an mportant technque to utlze the spatal degree of freedom brought by multple antennas at the transmtter, mult-user MIMO has some advantages over sngle-user MIMO [1] such as mmunty to propagaton lmtatons (e.g. per user channel matrx does not need to be full ran) and reduced requrements on the recever capablty (e.g. mult-layer processng s not requred). The nvestgatons have been focused on dfferent aspects of mult-user MIMO. The nformaton theoretcal channel capacty has been extensvely studed, along wth optmal precodng schemes []. Due to the prohbtve complexty n the optmal drty paper codng (DPC), some low complexty precodng schemes have been studed, such as zero-forcng (ZF) and bloc-dagonalzaton (BD). The number of scheduled users s drectly lmted by the number of antennas at the transmtter wth lnear precodng schemes, and the problem of how to select scheduled users arses. The scenaro of nterest of ths paper s downln of a cellular system, and here the optmal set of scheduled users can be defned wth a specfc optmzaton target and derved by exhaustve search over all possble combnatons. However, the complexty s huge wth medum to large number of canddates n a cell, so some sub-optmal user schedulng algorthms are desrable for practcal base staton mplementaton. To ths end, some greedy search algorthms have been proposed. In [3] the frst user s selected through channel gan, and followng users are added one by one untl an arbtrary number s reached. At each teraton, the user whch maxmzes sum rate (f t s added) s selected wth ZF precodng taen nto account. Same process s proposed n [4][5], but the lower bound of the broadcast channel capacty and the sum of channel gans wth null space successve projecton are used at each teraton as optmzaton target, respectvely. Currently coordnated mult-pont transmsson (CoMP) s beng studed and standardzed n 3GPP for LTE-A [6]. One transmsson scheme of CoMP s coherent jont transmsson, where data stream for a sngle user s coherently precoded and transmtted from antennas at multple base statons. To verfy the gan of mult-cell coordnaton, the performance of sngleuser MIMO, mult-user MIMO and CoMP are often compared through system smulatons [7][8], snce t s very dffcult to provde analytcal evaluatons wth realstc envronments. A smple and effcent user schedulng algorthm, whch can be vewed as varant of those n [3-5], was frstly proposed n [9]. In ths paper, we provde more detaled nvestgatons for the algorthm; compare ts performance wth tradtonal two-user schedulng algorthm n sngle-cell under dfferent assumptons. Smlar as [9], we also show the performance of CoMP wth ths algorthm but appled to users from multple cells. Snce the throughput gan from schedulng more than two users depends a lot on the assumptons, the evaluaton n ths paper can be used as gudance for concrete scheduler desgn for both sngle-cell and mult-cell operaton. The rest of the paper s organzed as follows. System model and smulaton setup are dscussed n Secton II. Secton III descrbes the layer adaptve user schedulng algorthm, and also the tradtonal two-user schedulng algorthm for comparson. In secton IV performance evaluaton s provded based on system level smulatons. Fnally, Secton V concludes the paper /1/$ IEEE
2 II. SYSTEM MODEL AND SIMULATION SETUP Ths paper s concerned wth LTE-A downln, where data for multple users are transmtted from base statons. A. Sngle-cell scenaro In sngle-cell scenaro, each base staton s assgned to a cell to handle the users n the cell coverage area, as shown n Fgure 1. The basc multplexng scheme n LTE-A s orthogonal frequency dvson multplexng (OFDM), whch means users n a same cell wll be allocated wth dfferent resource blocs (RBs). Wth mult-user MIMO, a sngle RB can be shared by multple spatally multplexed users. In ths paper we only consder one data stream for each user,.e. there s no spatal multplexng of sngle-user MIMO. Fgure 1 Sngle-cell scenaro consdered n LTE-A downln Denote N as number of schedulable users n -th cell, and Ω as the set of scheduled users n the same cell on a specfc RB. For the sae of smplcty, RB ndex s not present n the system model n ths secton as rado resource management s same across RBs. The receved sgnal at user n -th cell, can be modeled as r = H w x + H w x + H w x + n ( 1 ),, l l j, l l l Ω, l j, l Ω j, where H j, s the channel matrx between user and base staton j, w l and x l are the precodng vector and data symbol of user l, n s the nose at the recever of user. In ths paper the precodng matrx n -th cell s calculated by ZF over precodng vectors from spatally multplexed users: H ( ) 1 W =V V V V = v,v,...,v where S s the sze of Ω. 1 S ( ) In realstc world, there wll be channel estmaton error on SRS. Besdes, some other mperfectons are also consdered n ths paper, namely, sngle-antenna (ssrs) and narrow band (nsrs). ssrs means users wll transmt SRS from only one antenna, although equpped wth multple antennas for recever; as a result, only one row of the full channel matrx wll be nown at the base staton. nsrs means users wll transmt SRS n part of the system bandwdth, and effectvely the channel nformaton on a specfc RB wll be more lely to be outdated. In frequency dvson duplex (FDD) system, base staton has to rely on feedbac from users to derve per-user precodng vector n ( ). In LTE-A, codeboo based method s defned wth precodng matrx ndcator (PMI) feedbac. Gven the receved sgnal n ( 1 ), sgnal-to-nterferencenose-rato (SINR) s calculated for each user as SINR = uh, w j, l l + j, l l + σ n j=, l j, l u H w H w ( 4 ) where u s the combnng vector at user. Assumng perfect nterference nowledge at user recever, u can be derved wth mnmze mean square error (MMSE) prncple as 1 ( σ ) (, ) ( jl, l)( jl, l) ( jl, l)( jl, l) (, )(, ) u = R+ I H w n jl =, jl, H H H R= H w H w + H w H w H w H w ( 5 ) where R s the nterference covarance matrx, wth the frst term from transmsson n -th cell, whch s noted as nteruser nterference (IUI), and the second term accounts for ntercell nterference (ICI). In ths paper we assume perfect nowledge about IUI and ICI are avalable at user recever; however, wth realstc recever, the accurate covarance matrx for ICI part cannot be fully nown, but the power estmaton s usually used for dagonal elements and zero for other elements. B. Mult-cell scenaro In mult-cell scenaro, a sngle base staton s assgned to handle the users n the coverage area of multple cells, as shown n Fgure. Ideally, f perfect channel nowledge s avalable, e.g. n tme dvson duplex (TDD) system where downln channel can be measured from upln soundng reference sgnal (SRS), v s the domnant egen vector of the channel. H H, =U, S, V, ( 3 ) Fgure Mult-cell scenaro consdered n LTE-A downln 788
3 Wth remote rado head (RRH) deployment or based band poolng technque, a super cell can be formed to handle more users n a larger area; for example, users n one cell wll only receve desred sgnal from antennas at one of the three colocated base statons as n Fgure 1, but n Fgure all the antennas at the cell ste are used transmt desred sgnal for users n the whole coverage area. The specfc scenaro n Fgure s mentoned as ntra-ste CoMP. There are some benefts of such jont processng from mult-user pont of vew, and one aspect s that precodng matrxes whch are calculated separately n sngle-cell scenaro are now combned coherently, so ZF can be performed across more users. Ths wll reduce the nterference experenced by users, as ICI n sngle-cell scenaro are now treated as IUI. III. LAYER ADAPTIVE USER SCHEDULING One mportant aspect of mult-user MIMO n realstc world s the user schedulng,.e. how to determne Ω accordng to the channels states { H,, { 1,,..., N} }. Bascally, there are two factors that affect the selecton, namely the per-user schedulablty and compatblty among users. The former can be measured by the schedulng metrc used n sngle-user MIMO, whle the later can be based on the orthogonalty between the channels of dfferent users. A straghtforward user schedulng algorthm as n Table 1 can be developed, whch always schedules two users on each RB (named as MU-). The prmary user s selected by snglestream proportonal far (PF) metrc, and the secondary user s selected accordng to the product of sngle-stream PF metrc and orthogonalty wth the prmary user. Table 1 A straghtforward schedulng algorthm that always schedules two users on each RB 1) prmary user selecton 1 = arg max ) secondary user selecton H v 1 = arg max 1 1 v 1 The lmtaton of MU- s that two users can be scheduled at maxmum, and there could be potental throughput gan from schedulng more than two users. In partcular, t s mpossble to extend the algorthm n mult-cell scenaro as n Fgure, where degree of freedom n spatal doman wll not be utlzed effcently wth only two users scheduled, as the number of antennas wll be large. Therefore, an algorthm that schedules adaptve number of users s more desrable. Table shows a smple and effcent layer adaptve user schedulng algorthm [9] (named as MU-LA). Arbtrary A users can be scheduled on the same RB, f enough qualfed users can be found. At each teraton, the canddate user set s refreshed so that every qualfed user s orthogonal to all the users n the scheduled user set. If the canddate user set s not empty, the user wth hghest PF metrc s selected and added to the scheduled user set; otherwse, the algorthm stops wth less than A users scheduled. Table A layer adaptve schedulng algorthm that always schedules arbtrary number of users on each RB 1) prmary user selecton 1 = arg max Set ter=0 Set scheduled user set ω = { 1 } Set canddate user set θ = { 1,,..., N} 1 ) secondary users selecton Whle ω < A Increase ter by 1 For θ H vl If > OThreshold, l ω vl θ = θ End f End for If canddate user set θ > 0 = arg max θ Set ω = ω + Else Brea End f End whle The advantage of MU-LA s the adaptve number of scheduled users, whch could be adjusted accordng to the antennas at the base staton. Moreover, t can be easly appled to mult-cell scenaro, by trplng A for ntra-ste CoMP. IV. SIMULATION ANALYSIS In ths secton we wll provde performance evaluaton for MU-LA. The frst step s to nvestgate what could the best value be for O Threshold n Table. Then wth ths optmzed threshold, MU-LA s compared to MU- n sngle-cell scenaro under dfferent assumptons. Fnally, smulaton results are shown for mult-cell scenaro wth MU-LA. A. Smulaton paprameters The system level smulator s bult based on LTE-A downln. Homogenous networ s consdered wth full buffer traffc for all users, whch can provde a benchmar for the evaluaton of spectral effcency of dfferent MIMO technques. Users are unformly dstrbuted n the area of 19 stes/57 cells, and wrap around s enabled to model the out-ter nterference. For each cell, both 4 and 8 (cross-polarzed) transmt antennas are smulated, and both deal and realstc users recever (n terms of nterference nowledge) are consdered. Channel qualty ndcator (CQI) s calculated on common reference sgnals, whch are not precoded. As a result, outer loop ln adaptaton s employed [10] to compensate the msmatch between the measured reference sgnal strength and the power for data transmsson, and t s partcularly useful for MU-LA snce the transmt power at base staton s splt to adaptve number of scheduled users. Detaled smulaton parameters can be found n Table 3 (settngs n bold are default ones). 789
4 System Parameter Table 3 Smulaton assumptons for sngle-cell scenaro Settng Smulaton scenaro Macro Case 1 wth 19 stes(57 cells) Frequency band 10 MHz bandwdth at GHz carrer frequency Channel model 3GPP SCM UMa 8 azmuth spread (NLOS) / ITU UM Number of users per cell 10 Base staton antenna Columns wth {-45, +45} deg. x-pol antennas confguraton 0.5-wavelength spacng between columns 4/8 antenna elements per cell UE antenna confguraton Rx, x-pol wth {0,90} deg. Precodng scheme SVD/PMI based, wth ZF on top Recever User schedulng SRS confguraton CQI/PMI feedbac Ln adaptaton Ideal SU: sngle-cell PF schedulng wth RA MU-LA: max. /4 users scheduled for 4/8Tx MU-: fxed user schedulng 10 ms perod Ideal: dual antenna, 48-PRB Realstc: sngle antenna, 16-PRB Sub-band report based on CRS ports 6 ms delay, 10 ms perod Based on CQI and 10% frst BLER target B. Optmal value for O Threshold OThreshold wll determne how lely one user could fulfll the orthogonalty condton and can be qualfed as canddate user. As a threshold for the channel correlaton between two users, hgher value means looser requrement, and more users can be scheduled on the same RB. On the other hand, the orthogonalty among scheduled users becomes worse, and ZF would cause more severe power penalty to the desred sgnal. Table 4 shows the dstrbutons for number of scheduled users per RB, wth dfferent OThreshold values, and Fgure 3 shows the correspondng average (mean from CDF) and coverage throughput (5-tle n CDF). Table 4 Probablty dstrbuton for number of scheduled users per RB under dfferent OThreshold value Number of scheduled users per RB Threshold The results are generated under 8 antenna elements at base staton and SVD precodng. It can be found both average and coverage throughput are mproved wth threshold ncreased up to 0.4, snce each user can be allocated more RBs; however, coverage comes down f threshold s further ncreased to 0.5 as IUI becomes the unfavorable factor for cell edge users. Therefore, 0.4 seems to be a proper value and s thus assumed n the followng smulatons. C. Comparson wth sngle-user MIMO and MU- In Fgure 4 we compare the throughput performance of sngle-user MIMO and MU-LA. Ran adaptaton s enabled for sngle-user MIMO, so one user can have two data streams f better trouped can be provded than sngle stream transmsson. From the results t can be seen that mult-user MIMO wth MU-LA can lead to more than 30% throughput gan for both average and coverage, wth deal channel nowledge. However, n realstc case where ssrs and nsrs as descrbed n Secton II.A s consdered, the average gan can be stll as hgh as 6%, but the coverage gan decreases a lot to 7%. Fgure 4 Throughput comparson between SU-MIMO and MU-LA Next MU-LA s compared wth MU-, so that t can be observed under whch condton there could be gans n throughput from schedulng more than two users. Fgure 5 shows the comparson among sngle-user MIMO, MU- and MU-LA wth 4 antenna elements at base staton and wth both SVD and PMI based precodng. It should be noted that both MU- and MU-LA are schedulng two users at each RB, so the dfference only s how to select the secondary user. From Fgure 5 t can be seen that the throughput gan over sngle-user MIMO s ~10% for PMI based precodng and ~0% for SVD based precodng. MU- and MU-LA are gvng very smlar performance. Fgure 3 Throughput performance under dfferent OThreshold value Fgure 5 Performance comparson among SU, MU- and MU-LA wth 4 antenna elements at base staton 790
5 Fgure 6 shows smlar comparson as Fgure 5 but wth 8 transmt antennas. The gan of mult-user MIMO over sngleuser MIMO s larger. MU-LA provdes better average but slghtly worse coverage throughput than MU-. In partcular, f channel state nformaton can be accurately avalable at base staton (SVD based precodng s possble), t s meanngful to schedule more than two users per RB. The reason s that precodng wth 8 antenna elements can provde good separaton among scheduled users, so the mult-user dversty gan can be obtaned wth less sgnal penalty from ZF. Fgure 6 Performance comparson among SU, MU- and MU-LA wth 8 antenna elements at base staton D. MU-LA n mult-cell scenaro In ths subsecton, we wll evaluate the performance of MU-LA extended n a mult-cell scenaro. Intra-ste CoMP s consdered, and the modelng s lsted n Table 5 aganst snglecell mult-user MIMO. Table 5 Smulaton modellng of ntra-ste CoMP Sngle-cell MU- Intra-ste CoMP MIMO Number of base 3 1 statons per ste Number of users per base staton Number of antennas 4/8 1/4 per base staton Maxmum coscheduled users 4 1 Path loss b/w base staton and UE 1 path loss value for all antennas 3 path loss values, each value for a sectorzed antenna group The throughput gan of ntra-ste CoMP over sngle-cell mult-user MIMO s shown n Table 6 for both 3GPP Case 1 and ITU UM channel models. The results show that the CoMP gan (by usng extended MU-LA) s not so attractve for 3GPP Case 1 channel, and the reason s that ICI from co-located base statons s already qute lmted n sngle-cell scenaro, so splttng some power to serve users n other co-located cells (wth hgh path loss) s not cost-effcent. On the other hand, n IUT UM channel the azmuth spread s much larger, and ICI s lmtng the system performance snce some porton of transmt power wll be leaed to co-located cells even wth perfect precodng. Intra-ste CoMP can effectvely mtgate such ICI. Table 6 Throughput gan of ntra-ste CoMP over sngle-cell MIMO 3GPP Case 1 UM 4-Tx 8-Tx 4-Tx 8-Tx Average gan (%) Coverage gan (%) V. CONCLUSIONS In ths paper, we evaluate the throughput performance of a specfc mult-user schedulng algorthm through system level smulaton based on LTE-A downln. The algorthm greedly adds secondary users accordng to the orthogonalty wth already scheduled users and the PF metrc of canddate users, and arbtrary number of users can be scheduled on a same RB. The scalablty and complexty s desrable from base staton mplementaton pont of vew. From smulatons under sngle-cell scenaro, the optmal value for orthogonalty threshold s found. Although the throughput performance s qute mpressve (~40% gan over sngle-user MIMO) wth 8 transmt antennas and perfect channel nowledge, the gan loos less attractve for 4 transmt antennas or mperfect precodng. From smulatons under mult-cell scenaro, the throughput gan of ntra-ste CoMP over sngle-cell mult-user MIMO s qute lmted for 3GPP Case 1 channel, whle qute sgnfcant for ITU UM channel. The layer adaptve schedulng algorthm can be used as a reasonable scheduler wth proper parameter adjustment. REFERENCES [1] Gesbert D., Kountours M., Heath Jr. R.W., Chae C.B., Sälzer T., Shftng the MIMO Paradgm: From sngle-user to multuser communcatons, IEEE Sgnal Processng Magazne, vol. 4, no. 5, Sept. 007, pp [] Care G., Shama S. (Shtz), On the achevable throughput of a multantennagaussan broadcast channel, Informaton Theory, IEEE Transactons on, vol. 49, no. 7, July 003, pp [3] Dmc G., Sdropoulos N.D., On downln beamformng wth greedy user selecton: performance analyss and a smple new algorthm Sgnal Processng, IEEE Transactons on, vol. 53, no. 10, Oct. 005, pp [4] Xun Luo, Yang Yang, Zhangcheng Dng, Shu Fang, Shaoqan L, Lower bound capacty based schedulng n MUMIMO system, n Proc. of Communcatons and Networng n Chna (ChnaCom), 011 6th Internatonal ICST Conference on, Aug. 011, pp [5] Batsta, R.L., dos Santos, R.B., Macel, T.F., Fretas, W.C., Cavalcant, F.R.P., Performance Evaluaton for Resource Allocaton Algorthms n CoMP Systems, n Proc. of IEEE 7th Vehcular Technology Conference (VTC), Sept. 010, pp [6] 3GPP TR , Coordnated mult-pont operaton for LTE physcal layer aspects (Release 11), Verson , Dec [7] Huang, H., Trvellato, M., Hottnen, A., Shaf, M., Smth, P., Valenzuela, R., Increasng downln cellular throughput wth lmted networ MIMO coordnaton, Wreless Communcatons, IEEE Transactons on, vol. 8, no. 6, June 009, pp [8] Pennanen, H., Haataja, T., Lenonen, J., Toll, A., Latva-aho, M., System level evaluaton of TDD based LTE-Advanced MIMO- OFDMA systems, n Proc. of GLOBECOM Worshops (GC Wshps), 010 IEEE, Dec. 010, pp [9] 3GPP R , Results for CoMP Phase I evaluaton n homogeneous networ, CMCC, Barcelona, Span, May 011. [10] Poharyal, A., et.al., HARQ Aware Frequency Doman Pacet Scheduler wth Dfferent Degrees of Farness for the UTRAN Long Term Evoluton, n Proc. of IEEE 65th Vehcular Technology Conference (VTC), Aprl 007, pp
Performance 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 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 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 informationSTUDY ON LINK-LEVEL SIMULATION IN MULTI- CELL LTE DOWNLINK SYSTEM
Proceedngs of IEEE IC-BMT0 TUDY O LIK-LEVEL IMULATIO I MULTI- CELL LTE DOWLIK YTEM Yang Zhang, Ruoyu Jn, Xn Zhang, Dacheng Yang Beng Unversty of Posts and Telecommuncatons, Beng 00876, Chna 05330@bupt.edu.cn
More informationCalculation 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 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 informationAdaptive Modulation for Multiple Antenna Channels
Adaptve Modulaton for Multple Antenna Channels June Chul Roh and Bhaskar D. Rao Department of Electrcal and Computer Engneerng Unversty of Calforna, San Dego La Jolla, CA 993-7 E-mal: jroh@ece.ucsd.edu,
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 informationCombined Beamforming and Scheduling for High Speed Downlink Packet Access
Combned Beamformng and Schedulng for Hgh Speed Downlnk Packet Access Alexander Seeger Informaton and Communcaton Moble Semens A.G. Hofmannstr.5, 8359 Munch, Germany Alexander.Seeger@semens.com Marcn Skora
More informationUplink User Selection Scheme for Multiuser MIMO Systems in a Multicell Environment
Uplnk User Selecton Scheme for Multuser MIMO Systems n a Multcell Envronment Byong Ok Lee School of Electrcal Engneerng and Computer Scence and INMC Seoul Natonal Unversty leebo@moble.snu.ac.kr Oh-Soon
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 informationResource Allocation for Throughput Enhancement in Cellular Shared Relay Networks
Resource Allocaton for Throughput Enhancement n Cellular Shared Relay Networs Mohamed Fadel, Ahmed Hndy, Amr El-Key, Mohammed Nafe, O. Ozan Koyluoglu, Antona M. Tulno Wreless Intellgent Networs Center
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 informationThe Detection Algorithms Performance in BLAST Enhanced IEEE a WLAN Standard on Measured Channels. University of Bristol
The Detecton Algorthms Performance n BLAST Enhanced IEEE 802.11a WLAN Standard on Measured Channels Unversty of Brstol Robert Pechoc, Paul Fletcher, Andy Nx, Nshan Canagarajah and Joe McGeehan The Thrd
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 informationAN EFFICIENT ITERATIVE DFT-BASED CHANNEL ESTIMATION FOR MIMO-OFDM SYSTEMS ON MULTIPATH CHANNELS
AN FFICINT ITRATIV DFT-BASD CHANNL STIMATION FOR MIMO-OFDM SYSTMS ON MULTIPATH CHANNLS Jan Hafang Graduate Unversty of the Chnese Academy of Scences Insttute of Semconductors, CAS Beng, Chna hf@sem.ac.cn
More informationEE360: Lecture 7 Outline Cellular System Capacity and ASE Announcements Summary due next week
EE360: Lecture 7 Outlne Cellular System Capacty and ASE Announcements Summary due next week Capacty Area Spectral Effcency Dynamc Resource Allocaton Revew of Cellular Lecture Desgn consderatons: Spectral
More informationA Spreading Sequence Allocation Procedure for MC-CDMA Transmission Systems
A Spreadng Sequence Allocaton Procedure for MC-CDMA Transmsson Systems Davd Motter, Damen Castelan Mtsubsh Electrc ITE 80, Avenue des Buttes de Coësmes, 35700 Rennes FRAE e-mal: {motter,castelan}@tcl.te.mee.com
More informationJoint Adaptive Modulation and Power Allocation in Cognitive Radio Networks
I. J. Communcatons, etwork and System Scences, 8, 3, 7-83 Publshed Onlne August 8 n ScRes (http://www.scrp.org/journal/jcns/). Jont Adaptve Modulaton and Power Allocaton n Cogntve Rado etworks Dong LI,
More informationImpact of Interference Model on Capacity in CDMA Cellular Networks. Robert Akl, D.Sc. Asad Parvez University of North Texas
Impact of Interference Model on Capacty n CDMA Cellular Networks Robert Akl, D.Sc. Asad Parvez Unversty of North Texas Outlne Introducton to CDMA networks Average nterference model Actual nterference model
More informationA NOVEL PREAMBLE DESIGN FOR CHANNEL ESTIMATION IN MIMO- OFDM SYSTEMS RESULTING IN ENHANCED THROUGHPUT
Volume 53, umber 3, 01 ACTA TECHICA APOCESIS Electroncs and Telecommuncatons A OVEL PREAMBLE DESIG FOR CHAEL ESTIMATIO I MIMO- OFDM SYSTEMS RESULTIG I EHACED THROUGHPUT Shakeel Salamat ULLAH atonal Unversty
More informationFractional Base Station Cooperation Cellular Network
Fractonal Base Staton Cooperaton Cellular Network Naok usashma Tokyo Insttute of Technoloy, Department of Electrcal and Electronc Enneern, Arak-Sakauch Laboratores. Contents Backround Cell-ede problem
More informationDesign Rules for Efficient Scheduling of Packet Data on Multiple Antenna Downlink
Desgn Rules for Effcent Schedulng of acet Data on Multple Antenna Downln Davd J. Mazzarese and Wtold A. rzyme Unversty of Alberta / TRLabs Edmonton, Alberta, Canada E-mal: djm@ ece.ualberta.ca / wa@ece.ualberta.ca
More informationPower Minimization Under Constant Throughput Constraint in Wireless Networks with Beamforming
Power Mnmzaton Under Constant Throughput Constrant n Wreless etworks wth Beamformng Zhu Han and K.J. Ray Lu, Electrcal and Computer Engneer Department, Unversty of Maryland, College Park. Abstract In mult-access
More informationOpportunistic Beamforming for Finite Horizon Multicast
Opportunstc Beamformng for Fnte Horzon Multcast Gek Hong Sm, Joerg Wdmer, and Balaj Rengarajan allyson.sm@mdea.org, joerg.wdmer@mdea.org, and balaj.rengarajan@gmal.com Insttute IMDEA Networks, Madrd, Span
More informationA Benchmark for D2D in Cellular Networks: The Importance of Information
A Benchmark for D2D n Cellular Networks: The Importance of Informaton Yğt Özcan, Catherne Rosenberg Unversty of Waterloo {yozcan,cath}@uwaterloo.ca Fabrce Gullemn Orange Labs, France fabrce.gullemn@orange.com
More informationRelevance of Energy Efficiency Gain in Massive MIMO Wireless Network
Relevance of Energy Effcency Gan n Massve MIMO Wreless Network Ahmed Alzahran, Vjey Thayananthan, Muhammad Shuab Quresh Computer Scence Department, Faculty of Computng and Informaton Technology Kng Abdulazz
More informationOn Space-Frequency Water-Filling Precoding for Multi-User MIMO Communications
Proceedngs of the World ongress on Engneerng 05 Vol I WE 05, July - 3, 05, London, U.. On Space-Frequency Water-Fllng Precodng for Mult-User MIMO ommuncatons Yu-uan hang, Ye-Shun Shen, Fang-Bau Ueng and
More informationMulticarrier Modulation
Multcarrer Modulaton Wha Sook Jeon Moble Computng & Communcatons Lab Contents Concept of multcarrer modulaton Data transmsson over multple carrers Multcarrer modulaton wth overlappng Chap. subchannels
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 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 informationExponential Effective SIR Metric for LTE Downlink
Exponental Effectve SIR Metrc for LTE Downlnk Joan Olmos, Albert Serra, Slva Ruz, Maro García-Lozano, Davd Gonzalez Sgnal Theory and Communcatons Department Unverstat Poltècnca de Catalunya (UPC) Barcelona,
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 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 informationIMPACT OF LIMITED FEEDBACK ON MIMO- OFDM SYSTEMS USING JOINT BEAMFORMING
IMPACT OF LIMITED FEEDBACK ON MIMO- OFDM SYSTEMS USING JOINT BEAMFORMING NAJOUA ACHOURA 1 AND RIDHA BOUALLEGUE 1 Department Natonal Engneerng School of Tuns, Tunsa najouaachoura@gmalcom SUP COM, 6 Tel
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 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 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 informationAdvances in MIMO Techniques for Mobile Communications A Survey
Int. J. Communcatons, Network and System Scences, 010, 3, 13-5 do:10.436/jcns.010.33031 Publshed Onlne March 010 (http://www.scrp.org/journal/jcns/). Advances n MIMO echnques for Moble Communcatons A Survey
More informationOn the Feasibility of Receive Collaboration in Wireless Sensor Networks
On the Feasblty of Receve Collaboraton n Wreless Sensor Networs B. Bantaleb, S. Sgg and M. Begl Computer Scence Department Insttute of Operatng System and Computer Networs (IBR) Braunschweg, Germany {behnam,
More informationAssessment of LTE Uplink Power Control with Different Frequency Reuses Schemes
ICDT 22 : The Seventh Internatonal Conference on Dgtal Telecommuncatons Assessment of LTE Uplnk Power Control wth Dfferent Frequency Reuses Schemes Mohamed M. El-Ghawaby Electroncs and Communcatons AAST
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 informationChannel aware scheduling for broadcast MIMO systems with orthogonal linear precoding and fairness constraints
Channel aware schedulng for broadcast MIMO systems wth orthogonal lnear precodng and farness constrants G Prmolevo, O Smeone and U Spagnoln Dp d Elettronca e Informazone, Poltecnco d Mlano Pzza L da Vnc,
More informationMIMO Precoding Using Rotating Codebooks
1 MIMO Precodng Usng Rotatng Codebooks C Jang, M Wang, C Yang Abstract Next generaton wreless communcatons rely on multple nput multple output (MIMO) technques to acheve hgh data rates. eedback of channel
More informationA New Opportunistic Interference Alignment Scheme and Performance Comparison of MIMO Interference Alignment with Limited Feedback
A New Opportunstc Interference Algnment Scheme and Performance Comparson of MIMO Interference Algnment wth Lmted Feedback Johann Lethon, Chau Yuen, Hmal A. Suraweera and Hu Gao Sngapore Unversty of Technology
More informationOptimum Ordering for Coded V-BLAST
Optmum Orderng for Coded V-BLAST Alan Urarte Toboso Thess submtted to the Faculty of Graduate and Postdoctoral Studes n partal fulfllment of the requrements for the degree of Master of Appled Scence n
More informationCELLULAR SYSTEM CAPACITY and PERFORMANCE IMPROVEMENT with SDMA
CELLULAR SYSTEM CAPACITY and PERFORMANCE IMPROVEMENT wth SDMA Flpe Alves, Henrque Rbero, José Fernandes 3 Escola Superor de Tecnologa, Insttuto Poltécnco de Castelo Branco, 6 Castelo Branco, Portugal Phone:+35-7-339355
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 informationPerformance Analysis of Scheduling Policies for Delay-Tolerant Applications in Centralized Wireless Networks
Performance Analyss of Schedulng Polces for Delay-Tolerant Applcatons n Centralzed Wreless Networks Mohamed Shaqfeh and Norbert Goertz Insttute for Dgtal Communcatons Jont Research Insttute for Sgnal &
More informationDistributed user selection scheme for uplink multiuser MIMO systems in a multicell environment
Lee et al. EURASIP Journal on Wreless Communcatons and Networkng 212, 212:22 http://s.euraspournals.com/content/212/1/22 RESEARCH Dstrbuted user selecton scheme for uplnk multuser MIMO systems n a multcell
More informationHow to Scale Up the Spectral Efficiency of Multi-way Massive MIMO Relaying?
ow to Scale Up the Spectral Effcency of Mult-way Massve MIMO Relayng? Chung Duc o, en Quoc Ngo, Mchal Matthaou, and Trung Q. Duong School of Electroncs, Electrcal Engneerng and Computer Scence, Queen s
More informationPerformance Study of OFDMA vs. OFDM/SDMA
Performance Study of OFDA vs. OFD/SDA Zhua Guo and Wenwu Zhu crosoft Research, Asa 3F, Beng Sgma Center, No. 49, Zhchun Road adan Dstrct, Beng 00080, P. R. Chna {zhguo, wwzhu}@mcrosoft.com Abstract: In
More informationCorrelation Analysis of Multiple-Input Multiple-Output Channels with Cross-Polarized Antennas
Correlaton Analyss of Multple-Input Multple-Output Channels wth Cross-Polarzed Antennas Le Jang, Volker Jungnckel, Stephan Jaeckel, Lars Thele and Armn Brylka Fraunhofer Insttute for Telecommuncatons,
More informationFUTURE wireless systems will need to provide high data
IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS, VOL., NO. 1, JANUARY 7 9 Downlnk Performance and Capacty of Dstrbuted Antenna Systems n a Multcell Envronment Wan Cho, Student Member, IEEE, and Jeffrey G.
More informationOn Timing Offset and Frequency Offset Estimation in LTE Uplink *
On mng Offset and Frequency Offset Estmaton n LE Uplnk * Juan Lu, Bn Wu, and Pngan L School of Informaton Engneerng, Wuhan Unversty of echnology, No.22 Luosh Road, Hongshan Dstrct,Wuhan, Hube, Chna, 430070
More informationEnhancing Throughput in Wireless Multi-Hop Network with Multiple Packet Reception
Enhancng Throughput n Wreless Mult-Hop Network wth Multple Packet Recepton Ja-lang Lu, Paulne Vandenhove, We Shu, Mn-You Wu Dept. of Computer Scence & Engneerng, Shangha JaoTong Unversty, Shangha, Chna
More informationEnergy Efficient Adaptive Modulation in Wireless Cognitive Radio Ad Hoc Networks
Energy Effcent Adaptve Modulaton n Wreless Cogntve Rado Ad Hoc Networks Song Gao, Ljun Qan*, Dhadesugoor. R. Vaman ARO/ARL Center for Battlefeld Communcatons Research Prare Vew A&M Unversty, Texas A&M
More informationA MODIFIED DIRECTIONAL FREQUENCY REUSE PLAN BASED ON CHANNEL ALTERNATION AND ROTATION
A MODIFIED DIRECTIONAL FREQUENCY REUSE PLAN BASED ON CHANNEL ALTERNATION AND ROTATION Vncent A. Nguyen Peng-Jun Wan Ophr Freder Computer Scence Department Illnos Insttute of Technology Chcago, Illnos vnguyen@t.edu,
More informationA Predictive QoS Control Strategy for Wireless Sensor Networks
The 1st Worshop on Resource Provsonng and Management n Sensor Networs (RPMSN '5) n conjuncton wth the 2nd IEEE MASS, Washngton, DC, Nov. 25 A Predctve QoS Control Strategy for Wreless Sensor Networs Byu
More informationPriority-based Resource Allocation to Guarantee Handover and Mitigate Interference for OFDMA System
Prorty-based Resource Allocaton to Guarantee Handover and Mtgate Interference for OFDMA System Lex Xu, Yue Chen School of Electronc Engneerng and Computer Scence Queen Mary, Unversty of London London,
More informationMultipath Propagation. Outline. What is OFDM? (OFDM) for Broadband Communications and. Orthogonal Frequency Division Multiplexing
Orthogonal Dvson Multplexng (OFDM) for Broadband Communcatons and Dgtal Audo Broadcastng (DAB) Klaus Wtrsal wtrsal@nw.tugraz.at VL: Dgtale Audotechnk, 21. März, 2002 What s OFDM? Modulaton technque Requres
More informationPERFORMANCE OF THE LOCAL AVERAGING HANDOVER TECHNIQUE IN LONG TERM EVOLUTION NETWORKS
Vol.6 (4) December 5 PERFORANCE OF THE LOCAL AVERAGING HANDOVER TECHNIQUE IN LONG TER EVOLUTION NETWORKS I.O. Elujde*, O.O. Olugbara**, P.A. Owolaw*** and T. Nepal**** Dept. of Informaton Technology, Durban
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 informationMIMO-OFDM Systems. Team Telecommunication and Computer Networks, FSSM, University Cadi Ayyad, P.O. Box 2390, Marrakech, Morocco.
IJCSI Internatonal Journal of Computer Scence Issues, Vol. 8, Issue 3, ay 2011 ISSN (Onlne: 1694-0814 A Low-complexty Power and Bt Allocaton Algorthm for ultuser IO-OFD Systems Ayad Habb 1, Khald El Baamran
More informationNOMA for 5G Wireless Communication Systems
SCHOOL OF ELECTRICAL ENGINEERING AND TELECOMMUNICATIONS NOMA for 5G Wreless Communcaton Systems by Stella Ho Thess submtted as a requrement for the degree Bachelor of Engneerng (Electrcal Engneerng) Submtted:
More informationCooperative Multicast Scheduling Scheme for IPTV Service over IEEE Networks
Cooperatve Multcast Schedulng Scheme for IPTV Servce over IEEE 802.16 Networks Fen Hou 1, Ln X. Ca 1, James She 1, Pn-Han Ho 1, Xuemn (Sherman Shen 1, and Junshan Zhang 2 Unversty of Waterloo, Waterloo,
More informationA NSGA-II algorithm to solve a bi-objective optimization of the redundancy allocation problem for series-parallel systems
0 nd Internatonal Conference on Industral Technology and Management (ICITM 0) IPCSIT vol. 49 (0) (0) IACSIT Press, Sngapore DOI: 0.776/IPCSIT.0.V49.8 A NSGA-II algorthm to solve a b-obectve optmzaton of
More informationEffective SNR Based MIMO Switching in Mobile WiMAX Systems
Effectve SNR Based MIMO Swtcng n Moble WMAX Systems Myoung-Seob Km and Yong-wan Lee Scool of Electrcal Engneerng and INMC, Seoul Natonal Unversty Kwanak P. O. Box, Seoul -600 Korea Emal: mseob@ttl.snu.ac.kr
More informationCROSS-LAYER OPTIMIZATION PERFORMANCE OF SINGLE CELL MILLIMETER WAVE OFDM WIRELESS NETWORK UNDER RAIN FADING
Semnar Nasonal Aplkas Teknolog Informas 009 (SNATI 009) Yogyakarta, 0 Jun 009 CROSS-LAYER OTIMIZATION ERFORMANCE OF SINGLE CELL MILLIMETER WAVE OFDM WIRELESS NETWORK UNDER RAIN FADING E. Endroyono 1, G.
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 informationFull-duplex Relaying for D2D Communication in mmwave based 5G Networks
Full-duplex Relayng for D2D Communcaton n mmwave based 5G Networks Boang Ma Hamed Shah-Mansour Member IEEE and Vncent W.S. Wong Fellow IEEE Abstract Devce-to-devce D2D communcaton whch can offload data
More informationIEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS, VOL. 13, NO. 12, DECEMBER
IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS, VOL. 3, NO. 2, DECEMBER 204 695 On Spatal Capacty of Wreless Ad Hoc Networks wth Threshold Based Schedulng Yue Lng Che, Student Member, IEEE, Ru Zhang, Member,
More informationApproximate Joint MAP Detection of Co-Channel Signals
Approxmate Jont MAP Detecton of Co-Channel Sgnals Danel J Jaubsn and R Mchael Buehrer Moble and Portable Rado Research Group (MPRG), Wreless@VT, Vrgna Tech, Blacsburg, Vrgna, USA E-mal: {djj,buehrer}@vtedu
More informationIterative Detection and Decoding (IDD) MIMO-OFDM HARQ Algorithm with Antenna Scheduling
Iteratve Detecton and Decodng (IDD) MIMO-OFDM HARQ Algorthm wth Antenna Schedulng KyooHyun Km, SeungWon Kang, Manar Mohasen, and KyungH Chang he Graduate School of I & elecommuncatons, InHa Unversty Incheon,
More informationEfficient Large Integers Arithmetic by Adopting Squaring and Complement Recoding Techniques
The th Worshop on Combnatoral Mathematcs and Computaton Theory Effcent Large Integers Arthmetc by Adoptng Squarng and Complement Recodng Technques Cha-Long Wu*, Der-Chyuan Lou, and Te-Jen Chang *Department
More informationOn Channel Estimation of OFDM-BPSK and -QPSK over Generalized Alpha-Mu Fading Distribution
Int. J. Communcatons, Network and System Scences, 010, 3, 380-384 do:10.436/jcns.010.34048 Publshed Onlne Aprl 010 (http://www.scrp.org/journal/jcns/) On Channel Estmaton of OFDM-BPSK and -QPSK over Generalzed
More informationSubcarrier allocation for OFDMA wireless channels using lagrangian relaxation methods
Unversty of Wollongong Research Onlne Faculty of Informatcs - Papers (Archve) Faculty of Engneerng and Informaton Scences 2006 Subcarrer allocaton for OFDMA wreless channels usng lagrangan relaxaton methods
More informationENERGY EFFICIENT MILLIMETER WAVE RADIO LINK ESTABLISHMENT WITH SMART ARRAY ANTENNAS
ENERGY EFFICIENT MILLIMETER WVE RDIO LINK ESTLISHMENT WITH SMRT RRY NTENNS ehnam Neekzad, John S. aras Insttute for Systems Research and Electrcal and Computer Engneerng Department Unversty of Maryland
More informationA Novel Optimization of the Distance Source Routing (DSR) Protocol for the Mobile Ad Hoc Networks (MANET)
A Novel Optmzaton of the Dstance Source Routng (DSR) Protocol for the Moble Ad Hoc Networs (MANET) Syed S. Rzv 1, Majd A. Jafr, and Khaled Ellethy Computer Scence and Engneerng Department Unversty of Brdgeport
More informationQos-aware resource allocation for mixed multicast and unicast traffic in OFDMA networks
RESEARCH Open Access Qos-aware resource allocaton for mxed multcast and uncast traffc n OFDMA networs Hu Deng 1,2*, Xaomng Tao 1 and Janhua Lu 1 Abstract Ths artcle focuses on the subchannel and power
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 informationReduced Front-End Reception Requirements for Satellite Broadcast using Interference Processing
Reduced Front-End Recepton Requrements for Satellte Broadcast usng Interference Processng Enrco Casn, Gennaro Gallnaro, and Joel Grotz, Member, IEEE Abstract The problem of fxed satellte broadcast recepton
More informationOptimal Design of High Density WLANs
Optmal Desgn of Hgh Densty 8. WLANs Vvek P. Mhatre Thomson Research Lab, Pars, France mhatre@gmal.com Konstantna Papagannak Intel Research Cambrdge, UK dna.papagannak@ntel.com Abstract: The provsonng of
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 informationBlock Diagonal Precoding Based Power Allocation for Coordinated Multi-Point Transmission
54 JOUAL OF COMMUICAIOS, VOL 6, O 7, OCOBE 0 Bloc Dagonal recodng Based ower Allocaton for Coordnated Mult-ont ransmsson Jng Han Broadband Wreless Communcatons and Multmeda Laboratory, Key Laboratory of
More informationLETTER An MMSE-Nulling Partial-PIC Receiver for Multiuser Downlink MIMO MC-CDMA Systems
IEICE TRANS. COMMUN., VOL.E88 B, NO.4 APRIL 2005 1725 LETTER An MMSE-Nullng Partal-PIC Recever for Multuser Downlnk MIMO MC-CDMA Systems Jeong-Hoe KU a, Kyeongyeon KIM, Sejoon SHIM,MnGooKIM, and Chungyong
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 informationPAPER Effect of Joint Detection on System Throughput in Distributed Antenna Network
DOI:10.1587/transcom.2018EBP3077 Publczed:2018/08/29 Ths advance publcaton artcle wll after proofreadng. IEICE TRANS.??, VOL.Exx??, NO.xx XXXX 200x 1 PAPER Effect of Jont Detecton on System Throughput
More informationThe Performance Improvement of BASK System for Giga-Bit MODEM Using the Fuzzy System
Int. J. Communcatons, Network and System Scences, 10, 3, 1-5 do:10.36/jcns.10.358 Publshed Onlne May 10 (http://www.scrp.org/journal/jcns/) The Performance Improvement of BASK System for Gga-Bt MODEM Usng
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 informationChannel Alternation and Rotation in Narrow Beam Trisector Cellular Systems
Channel Alternaton and Rotaton n Narrow Beam Trsector Cellular Systems Vncent A. Nguyen, Peng-Jun Wan, Ophr Freder Illnos Insttute of Technology-Communcaton Laboratory Research Computer Scence Department-Chcago,
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 informationIterative Water-filling for Load-balancing in
Iteratve Water-fllng for Load-balancng n Wreless LAN or Mcrocellular Networks Jeremy K. Chen Theodore S. Rappaport Gustavo de Vecana Wreless Networkng and Communcatons Group (WNCG), The Unversty of Texas
More informationA MODIFIED DIFFERENTIAL EVOLUTION ALGORITHM IN SPARSE LINEAR ANTENNA ARRAY SYNTHESIS
A MODIFIED DIFFERENTIAL EVOLUTION ALORITHM IN SPARSE LINEAR ANTENNA ARRAY SYNTHESIS Kaml Dmller Department of Electrcal-Electroncs Engneerng rne Amercan Unversty North Cyprus, Mersn TURKEY kdmller@gau.edu.tr
More informationPerformance and Analysis of CDM-FH-OFDMA for Broadband Wireless Systems
Performance and Analyss of CDM-FH-OFDMA for Broadband Wreless Systems Kan Zheng, Lu Han, Janfeng Wang, and Wenbo Wang Wreless Sgnal Processng Lab, Bejng Unversty of Posts & Telecomms, Bejng, Chna zkan@buptneteducn
More informationCharacterization and Analysis of Multi-Hop Wireless MIMO Network Throughput
Characterzaton and Analyss of Mult-Hop Wreless MIMO Network Throughput Bechr Hamdaou EECS Dept., Unversty of Mchgan 226 Hayward Ave, Ann Arbor, Mchgan, USA hamdaou@eecs.umch.edu Kang G. Shn EECS Dept.,
More informationErgodic Capacity of Block-Fading Gaussian Broadcast and Multi-access Channels for Single-User-Selection and Constant-Power
7th European Sgnal Processng Conference EUSIPCO 29 Glasgow, Scotland, August 24-28, 29 Ergodc Capacty of Block-Fadng Gaussan Broadcast and Mult-access Channels for Sngle-User-Selecton and Constant-Power
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 informationOn High Spatial Reuse Broadcast Scheduling in STDMA Wireless Ad Hoc Networks
On Hgh Spatal Reuse Broadcast Schedulng n STDMA Wreless Ad Hoc Networks Ashutosh Deepak Gore and Abhay Karandkar Informaton Networks Laboratory Department of Electrcal Engneerng Indan Insttute of Technology
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 information