A Low Cost Direct Channel Feedback Method in OFDMA Systems

Xu Dao-feng; Huang Yong-ming; Yang L -xi

doi:10.3724/SP.J.1146.2006.01885

Volume 30 Issue 6

Dec. 2010

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Xu Dao-feng, Huang Yong-ming, Yang L -xi. A Low Cost Direct Channel Feedback Method in OFDMA Systems[J]. Journal of Electronics & Information Technology, 2008, 30(6): 1409-1412. doi: 10.3724/SP.J.1146.2006.01885

Citation:

Xu Dao-feng, Huang Yong-ming, Yang L -xi. A Low Cost Direct Channel Feedback Method in OFDMA Systems[J]. Journal of Electronics & Information Technology, 2008, 30(6): 1409-1412. doi: 10.3724/SP.J.1146.2006.01885

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A Low Cost Direct Channel Feedback Method in OFDMA Systems

doi: 10.3724/SP.J.1146.2006.01885

Received Date: 2006-11-27
Rev Recd Date: 2007-10-22
Publish Date: 2008-06-19

Abstract

Abstract

A low cost, real-time CSI feedback method is proposed. The analog DownLink Channel State Information (DL-CSI) obtained at receivers is spreaded and then superimposed upon UpLink User Sequences (UL-US) before transmitting, thus avoiding DL-CSI from exclusive occupation of system resources. Using interference cancellation, iterative UL-US detection and DL-CSI estimation is carried out at base station. Due to spreading, DL-CSI can be accurately recovered even with little allocated energy. Simulations results demonstrate the practicability of the proposed method.

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References(1)

References

Viswanath P, Tse D N C, and Laroia R. Opportunisticbeamforming using dumb antennas[J].IEEE Trans. onInformation Theory.2002, 48(6):1277-1294[2]Love D J and Heath R W Jr. Multi-mode precoding usinglinear receivers for limited feedback MIMO systems[C].International Conference on Communications Proceedings,Paris, France, June 20-24, 2004: 448-452.[3]Love D J and Heath R W Jr. Limited feedback unitaryprecoding for spatiall multiplexing systems[J].IEEE Trans.on Information Theory.2005, 51(8):2967-2976[4]Marzetta T L and Hochwald B M. Fast transfer of channelstate information in wirelesss systems[J].IEEE Trans. onSignal Processing.2006, 54(4):1268-1278[5]Thomas T A, Baum K L, and Sartori P. Obtaining channelknowledge for closed-loop multi-stream broadbandMIMO-OFDM communications using direct channelfeedback[C]. IEEE Global Communications ConferenceProceedings, St Louis, Mo, USA, Nov. 28-Dec. 2, 2005:3907-3911.[6]Samardzija D and Mandayam N. Unquantized and uncodedchannel state information feedback on wireless channels[C].IEEE Wireless Communications and Networking ConferenceProceedings, New Orleans, LA, USA, Mar. 13-17, 2005:1059-1065.[7]Xu D, Huang Y, and Yang L. Feedback of downlink channelstate information based on superimposed coding[J]. IEEECommunications Letters, 2007, 11(3): 240-242.

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