In this paper, we study the interference-unaware receiver (IUR), which does not need the knowledge of interference or the process for precoding at the transmitter, for the interference-limited multiple-input-multiple-output (MIMO) system. We show that if the number of receive antennas is smaller than a threshold, then the interference terms dominate the MIMO channel capacity and the achievable rates of IUR so that the achievable rates of IUR can be significantly degraded by the interferences. We further show that if the number of receive antennas is larger than the threshold, then increasing the number of receive antennas can let the interference terms be negligible so that the MIMO channel capacity and the achievable rates of IUR all can reach M times the channel capacity of 1 by N single-input-multiple-output (SIMO) channel, where M denotes the number of transmit antennas and N denotes the number of receive antennas. This implies that in addition to completely eliminating cochannel interference, increasing the number of receive antennas in IUR can also make the MIMO system transmit M parallel substreams without inter-substream interference.

在本文中，我们研究了干扰受限多输入多输出 (MIMO) 系统的干扰无感知接收器 (IUR)，它不需要干扰知识或发射器处的预编码过程。我们表明，如果接收天线的数量小于阈值，则干扰项将支配 MIMO 信道容量和 IUR 的可实现速率，因此 IUR 的可实现速率会因干扰而显着降低。我们进一步表明，如果接收天线的数量大于阈值，那么增加接收天线的数量可以让干扰项可以忽略不计，从而使 MIMO 信道容量和 IUR 的可实现速率都可以达到M倍信道容量1乘N单输入多输出 (SIMO) 通道，其中M表示发射天线的数量，N表示接收天线的数量。这意味着除了完全消除同信道干扰外，增加IUR中的接收天线数量还可以使MIMO系统传输M个并行子流而不会产生子流间干扰。