Joint Tx/Rx MMSE Filtering for Single-Carrier MU-MIMO Uplink
Joint Tx/Rx MMSE Filtering for Single-Carrier MU-MIMO Uplink
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发表时间：
2015
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通讯作者：
Shinya Kumagai;F. Adachi
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作者：
Shinya Kumagai;F. Adachi
在宽带单载波（SC）多用户多输入多输出（MU-MIMO）传输中，由信道的频率选择性、天线间干扰（IAI）和用户间干扰（IUI）引起的符号间干扰（ISI）会降低传输质量。本文提出了一种基于最小均方误差的SC-MU-MIMO上行传输联合收发线性空间/频率滤波（联合Tx/Rx MMSE滤波），假设每个用户设备（UE）只知道自己与基站（BS）之间的信道状态信息（CSI）（即不考虑UE之间的CSI共享）。通过联合应用每个UE的Tx滤波和BS的Rx滤波，将每个UE和BS之间的单用户MIMO信道转换为多个特征模，并将基于MMSE的Tx功率分配和Rx频域均衡（FDE）应用于每个特征模。因此，IAI和ISI被显著抑制。同时，IUI被BS的Rx滤波抑制。此外，引入自适应秩/调制控制（ARMC）来利用接收到的信干扰加噪声功率比（SINR）在特征模间的间隙。计算机仿真结果证实了SC-MU-MIMO上行传输中联合Tx/Rx MMSE滤波的有效性。
—In broadband single-carrier (SC) multi-user multiple-input multiple-output (MU-MIMO) transmissions, inter-symbol interference (ISI) caused by frequency-selectivity of the channel, inter-antenna interference (IAI), and inter-user interference (IUI) degrade the transmission quality. This paper proposes a minimum mean square error based joint transmit and receive linear spatial/frequency filtering (joint Tx/Rx MMSE filtering) for SC-MU-MIMO uplink transmissions assuming that each user equipment (UE) only knows the channel state information (CSI) between itself and the base station (BS) (i.e., CSI sharing among UEs is not considered). By Jointly applying each UE’s Tx filtering and BS’s Rx filtering, single-user (SU) MIMO channel between each UE and the BS is transformed into multiple eigenmodes, and MMSE based Tx power allocation and Rx frequency-domain equalization (FDE) are applied to each eigenmode. As a consequence, IAI and ISI are suppressed significantly. At the same time, IUI is suppressed by BS’s Rx filtering. Furthermore, adaptive rank/modulation control (ARMC) is introduced to utilize the received signal-to-interference plus noise power ratio (SINR) gap among eigenmodes. Computer simulation results confirm the effectiveness of proposed joint Tx/Rx MMSE filtering in SC-MU-MIMO uplink transmissions.