Opportunistic transmission in MU-MIMO downlink with reduced feedback and mode adaptation

Li, Zhao; Yang, Jinlong; Li, Jiandong; Yao, Junliang

doi:10.1109/wirelessvitae.2009.5172478

Cited by 2 publications

(5 citation statements)

References 16 publications

(21 reference statements)

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“…11 shows the average CDI feedback load per time slot normalized by M . The load of GS BF woT , GS SM woT and GS M A woT are equal to K, 2K and varies from K to 2K along with increasing SNR, respectively [13]. For clarity, these curves are not plotted.…”

Section: Simulation Resultsmentioning

confidence: 99%

“…The probabilities that an arbitrary user is eligible for feeding information in an overhead slot is (10) In Table II (11)- (13) give the probabilities that an arbitrary MS is in one of the above states, respectively.…”

Section: Performance Analysismentioning

confidence: 99%

“…This advantage is called multiuser diversity (MUD). Accordingly, some works focus on opportunistic beamforming (OB) [8][9][10][11][12][13], i.e. in each time slot only one user among multiple candidates is selected to exploit MUD.…”

Section: Introductionmentioning

confidence: 99%

“…Since feedback information is part of system overhead, a lot of works focus on feedback load reduction. Most of them employ threshold to eliminate MSs whose channel quality is below the given threshold [6][7][8][9][12][13], i.e. users who are not eligible for transmission would keep silent.…”

Section: Introductionmentioning

confidence: 99%

“…If adaptive transmission [14] is employed, not only the communication performance can be improved, the system feedback cost could also dynamically vary along with channel status. In [13] both threshold scheme and transmission mode adaptation are adopted. However, threshold design and mode selection criterion are not elaborated.…”

Section: Introductionmentioning

confidence: 99%

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Adaptive Opportunistic Transmission in MU-MIMO Downlink with Reduced Feedback

Li¹,

Yang²,

Yao³

2010

JCM

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In this paper we proposed two threshold-aided adaptive opportunistic transmission strategies in multiuser multiple-input multiple-output (MU-MIMO) downlink with limited feedback. Threshold scheme in company with transmission mode adaptation are employed to handle feedback cost and improve system performance. In one time slot, each mobile station (MS) carries out channel estimation, selects appropriate transmission mode and feeds back adaptively. With feedback information the base station (BS) schedules one user out of candidate MSs and transmits to it. One of the proposed strategies employs single-level threshold. However, proper design of the threshold is difficult. Since a tight one would result in high outage probability whereas a loose one could not reduce feedback load effectively. Thus the other method employs double-level threshold. In this scheme, the primary threshold is used for feedback reduction, the secondary one is employed to guarantee the outage performance. In evaluating the strategies, statistical analysis and Monte-Carlo simulation are used. Results show that with properly designed thresholds, the proposed schemes can greatly reduce the feedback load, achieve high throughput and good outage performance

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Section: Simulation Resultsmentioning

confidence: 99%

Section: Performance Analysismentioning

confidence: 99%