OFDMA框架下一种低代价直接信道信息反馈方法
doi: 10.3724/SP.J.1146.2006.01885
A Low Cost Direct Channel Feedback Method in OFDMA Systems
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摘要: 该文提出一种低代价下行信道信息实时反馈方法。在接收端将模拟量信道信息扩频后叠加在上行信息序列中进行上传,不必为下行信道信息分配单独的时频资源。在基站侧利用干扰消除原理,迭代进行信息序列检测与信道信息估计。由于对下行信道信息进行了扩频处理,即使分配较低的能量也能在基站侧可靠恢复。仿真实验证明这种方法的有效性。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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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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