Complexity reduced detection for MIMO-OFDMA uplink with distinct frequency offsets from each user
Complexity reduced detection for MIMO-OFDMA uplink with distinct frequency offsets from each user
复制标题
降低了每个用户具有不同频率偏移的 MIMO-OFDMA 上行链路检测的复杂性
DOI：
10.1016/j.phycom.2013.03.002
复制
发表时间：
2013
影响因子：
2.2
通讯作者：
Ahmed S
中科院分区：
文献类型：
--
作者：
Ahmed S
在这项工作中，我们提出了一种相对低复杂度的迭代算法，用于检测多输入多输出（MIMO）正交频分多址（OFDMA）系统上行链路的传输符号。该算法允许每个用户和基站 (BS) 之间存在不同的频率偏移 (FO)。 FO 会导致载波间干扰 (ICI)，从而降低接收器的性能并增加解码传输符号的计算复杂性。为了降低每个接收天线处的计算复杂度，所提出的算法仅考虑子载波k对±D个附近子载波的干扰，并忽略对剩余子载波的干扰。这会产生带状结构化 ICI 矩阵，用于设计低复杂度软干扰消除最小均方误差 (SIC-MMSE) 均衡器。忽略子载波的影响可以通过增加接收天线的数量来补偿。仿真结果表明，对于未编码系统，所提出算法的误码率 (BER) 性能优于 MMSE 均衡，并且非常接近无 FO 场景。此外，当合并卷积编码时，所提出的算法仅在第一次迭代后才优于编码的 MMSE 均衡器。
In this work, we propose a relatively low-complexity iterative algorithm for the detection of transmitted symbols at the uplink of a multiple-input multiple-output (MIMO) orthogonal frequency-division multiple-access (OFDMA) system. The algorithm allows distinct frequency-offsets (FO) s between each user and the base-station (BS). FOs cause inter-carrier-interference (ICI), which degrades the performance of the receiver and increases the computational-complexity to decode the transmitted symbols. In order to decrease the computational-complexity at each receive antenna the proposed algorithm accounts for the interference of subcarrier k onto only±D nearby subcarriers and ignores the interference on remaining subcarriers. This yields a banded structured ICI matrix, which is exploited to design a low-complexity soft-interference-cancelation minimum mean-squared error (SIC-MMSE) equalizer. The effects of ignoring the subcarriers are compensated for by increasing the number of receive antennas. Simulation results show that for an uncoded system the bit-error-rate (BER) performance of the proposed algorithm outperforms the MMSE equalization and is very close to the no FO scenario. Moreover, when convolution encoding is incorporated, the proposed algorithm outperforms the coded MMSE equalizer only after the first iteration.
分层对角分层时空架构：信号处理和信息论方面
DOI：
10.1109/tsp.2003.818199
发表时间：
2003
期刊：
IEEE Trans. Signal Process.
影响因子：
--
作者：
M. Sellathurai;G. Foschini
通讯作者：
G. Foschini
上行 OFDMA 系统中基于 EM 的载波频率偏移和信道联合最大似然估计
DOI：
10.1109/vetecf.2004.1400077
发表时间：
2004
期刊：
IEEE 60th Vehicular Technology Conference, 2004. VTC2004-Fall. 2004
影响因子：
--
作者：
Man;S. Tsai;C.
通讯作者：
C.