A Cooperative Transmission and Receiving Scheme for IDMA with Time-Reversal Technique
A Cooperative Transmission and Receiving Scheme for IDMA with Time-Reversal Technique
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DOI：
10.1007/s11277-009-9898-6
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发表时间：
2011-06
影响因子：
2.2
通讯作者：
Xingzhong Xiong;Jianhao Hu;X. Ling
中科院分区：
文献类型：
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作者：
Xingzhong Xiong;Jianhao Hu;X. Ling
本文提出了一种基于时间反转（TR）技术的交错多址（IDMA）系统的高效上下行协同收发方案。由于该收发器系统采用时分双工（TDD）模式，因此我们将该系统称为TDR-IDMA。在TDR-IDMA系统中，从上行链路获得的信道脉冲响应的时间反转版本用于在基站接收机的初等信号估计器之前处理接收信号。由于不同用户的多径弱相关性，TDR-IDMA类涡轮检测开始时的信噪比（SINR）可以显著提高。与传统的IDMA系统相比，TDR-IDMA系统的信号检测迭代次数大大减少。因此，该方案有效地降低了上行链路的多用户检测（MUD）计算负荷，这是IDMA系统的瓶颈。在BS的发射机中也采用了TR处理，以降低用户端（ue）的复杂性。仿真和分析结果表明，TDR-IDMA处理速度快，使用简单，可以达到传统IDMA系统的性能要求。
In this paper, we propose an efficient uplink and downlink cooperative transmission and receiving scheme for interleave-division multiple access (IDMA) systems with time-reversal (TR) technique. We refer this system as TDR-IDMA, since the time- division duplexing (TDD) mode is used in this transceiver system. In TDR-IDMA systems, the time-reversed version of the channel impulse responses obtained from the uplink is used to process the received signal before the elementary signal estimator in the receiver of base station (BS). Due to the weak correlations of multi-path for different users, the signal to interference and noise ratio (SINR) at the beginning of turbo-like detection of TDR-IDMA can be increased significantly. Compared with conventional IDMA system, much less iterations is needed for signal detection in TDR-IDMA systems. Thus, the proposed scheme effectively reduces the multi-user detection (MUD) computation load for the uplink, which is the bottleneck for IDMA system. TR processing is also applied in the transmitter of BS to reduce the complexity of user ends (UEs). Simulation and analysis results show that TDR-IDMA can achieve the same performance of the traditional IDMA system with fast processing speed and simple UEs.