Adaptive Modulation for Cooperative Communications with Noisy Feedback

被引：0

作者：

Qian, Chuyi ^{[1
]}

Ma, Yi ^{[1
]}

Tafazolli, Rahim ^{[1
]}

机构：

[1] Univ Surrey, Ctr Commun Syst Res, Surrey GU2 7XH, England

来源：

2011 7TH INTERNATIONAL WIRELESS COMMUNICATIONS AND MOBILE COMPUTING CONFERENCE (IWCMC) | 2011年

关键词：

Adaptive modulation; cooperative communications; noisy feedback; relay channel; CAPACITY THEOREMS; FADING CHANNELS; DIVERSITY; STRATEGIES; NETWORKS;

D O I：

暂无

中图分类号：

TN [电子技术、通信技术];

学科分类号：

0809 ;

摘要：

Cooperative communication is an alternative way to generate spatial diversity. However due to the extra time slot required for relay transmission, the spectral efficiency (SE) is reduced. Adaptive modulation can optimize the spectral efficiency by adopting the transmission parameters to the channel conditions. This requires the perfect channel state information (CSI) feedback at the transmitter. However, in real life this is not practical. The feedback channel is noisy and fading which causes feedback errors. In this contribution, first we investigate the performance of adaptive modulation schemes for cooperative communications with perfect feedback, the adaptive modulation is applied both by the source and the relay. Then the impact of noisy feedback channels on the performance is analysed. The simulation results demonstrate the spectral efficiency improvement, and illustrates that the effect of the noisy feedback can be ignored when the feedback channel signal-to-noise ratio (SNR) is relatively high i.e. 10 dB.

引用

页码：173 / 177

页数：5

共 12 条

[1] Adaptive modulation over Nakagami fading channels [J].

Alouini, MS ;

Goldsmith, AJ .

WIRELESS PERSONAL COMMUNICATIONS, 2000, 13 (1-2) :119-143

[2] Joint Adaptive Modulation and Diversity Combining with Feedback Error Compensation [J].

Choi, Seyeong ;

Yang, Hong-Chuan ;

Alouini, Mohamed-Slim ;

Qaraqe, Khalid A. .

IEEE TRANSACTIONS ON COMMUNICATIONS, 2009, 57 (11) :3214-3219

[3]

COVER TM, 1979, IEEE T INFORM THEORY, V25, P572, DOI 10.1109/TIT.1979.1056084

[4] Feedback constraints of adaptive transmission [J].

Ekpenyong, Anthony E. ;

Huang, Yih-Fang .

IEEE SIGNAL PROCESSING MAGAZINE, 2007, 24 (03) :69-78

[5] Feedback-detection strategies for adaptive modulation systems [J].

Ekpenyong, Anthony E. ;

Huang, Yih-Fang .

IEEE TRANSACTIONS ON COMMUNICATIONS, 2006, 54 (10) :1735-1740

[6] Variable-rate variable-power MQAM for fading channels [J].

Goldsmith, AJ ;

Chua, SG .

IEEE TRANSACTIONS ON COMMUNICATIONS, 1997, 45 (10) :1218-1230

[7] Cooperative strategies and capacity theorems for relay networks [J].

Kramer, G ;

Gastpar, M ;

Gupta, P .

IEEE TRANSACTIONS ON INFORMATION THEORY, 2005, 51 (09) :3037-3063

[8] Cooperative diversity in wireless networks: Efficient protocols and outage behavior [J].

Laneman, JN ;

Tse, DNC ;

Wornell, GW .

IEEE TRANSACTIONS ON INFORMATION THEORY, 2004, 50 (12) :3062-3080

[9]

Ochiai H., 2004, P IEEE VTC FALL SEPT, V54, P4645

[10] An alternative expression for the symbol-error probability of MPSK in the presence of I/Q unbalance [J].

Park, S ;

Yoon, D .

IEEE TRANSACTIONS ON COMMUNICATIONS, 2004, 52 (12) :2079-2081

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