Rectangular Differential Spatial Modulation for Open-Loop Noncoherent Massive-MIMO Downlink
Rectangular Differential Spatial Modulation for Open-Loop Noncoherent Massive-MIMO Downlink
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DOI：
10.1109/twc.2017.2657497
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发表时间：
2017-03
影响因子：
10.4
通讯作者：
Naoki Ishikawa;S. Sugiura
中科院分区：
文献类型：
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作者：
Naoki Ishikawa;S. Sugiura
针对开环非相干多输入多输出(MIMO)下行链路，提出了一种新的差分空时编码方案，该方案的传输速率随发射天线数的增加呈对数增长。更具体地说，所提出的方案依赖于差分编码的方阵到其矩形对应矩阵的投影，因此能够减少块传输所需的符号间隔的数目。这对于大规模MIMO场景尤其有利，在这种场景中，发射天线数量非常高。该方案独有的另一个优点是在发射机和接收机都不需要信道状态信息(CSI)，这消除了导频开销、CSI估计、CSI反馈和时分双工互易性。此外，与传统的相干空间调制方案类似，该方案的矩形传输矩阵每列仅包含单个非零元素，因此，发射机可能仅依赖于单个RF链。
In this paper, a novel differential space-time coding scheme is conceived for open-loop noncoherent multiple-input multiple-output (MIMO) downlink scenarios, where the transmission rate increases logarithmically in a scalable manner upon increasing the number of transmit antennas. More specifically, the proposed scheme relies on the projection of a differentially encoded square matrix to its rectangular counterpart and so is capable of reducing the number of symbol intervals needed for block transmission. This is especially beneficial for massive MIMO scenarios, in which the number of transmit antennas is very high. Another advantage exclusive to the presented scheme is that no channel state information (CSI) is required at either the transmitter or the receiver, which eliminates pilot overhead, CSI estimation, CSI feedback, and time-division duplex reciprocity. Furthermore, the rectangular transmission matrix of the proposed scheme contains only a single non-zero element per column, and hence, the transmitter may rely on only a single RF chain, similar to the conventional coherent spatial modulation scheme.