Massive multiple-input multiple-output (MIMO) and full-duplex (FD) are promising candidates for achieving the spectral efficiency to meet the needs of 5G communications. One essential key to realizing practical FD massive MIMO systems is how to effectively mitigate the self-interference (SI). Conventionally, however, the performance comparison of different SI methods by reflecting the actual channel characteristics was insufficient in the literature. Accordingly, this paper presents a performance analysis of SI cancellation (SIC) methods in FD massive MIMO systems. Analytical and numerical results confirm that, in an imperfect channel-estimation case, the ergodic rates performance of the spatial suppression in the uplink outperforms those of the SI subtraction, due to the correlation between the precoder and the estimation error of the SI channel. In addition, we discuss which method performs better under different given system constraints such as uplink and downlink sum rates, the total transmit power, and the power scaling law.
翻译:实现实际的FD大型MSIM系统的关键之一是如何有效减少自干预。然而,从公约角度讲,通过反映实际频道特点对不同的SI方法进行性能比较在文献中是不够的。因此,本文件对FD大型MIMO系统中的SI取消方法进行了绩效分析。分析和数字结果证实,在一个不完善的频道估计案例中,由于前代码和SI频道估计错误之间的相互关系,上链接的空间压抑率表现超过了SI减幅。此外,我们讨论了在不同的系统制约下,如上链接和下链接总和率、总传输力和权力扩增法下,哪些方法效果更好。