This paper considers a cooperative wireless system with multiple antennas at the source. A multi-antenna relay equipped with a power splitter is introduced between the source and destination. It utilizes the energy from the received signal for amplification and transmit it to the destination. The linear precoding techniques such as zero forcing (ZF) and minimum mean square error (MMSE) are used to reduce the interference. We compare two antenna selection techniques viz. norm-based antenna selection (NBAS) and received signal-to-noise ratio (SNR) based antenna selection (RSBAS). It is analyzed that the NBAS and RSBAS antenna selection techniques offer improvement of 20% and 37% over random antenna selection technique. However, the antenna selection technique NBAS offers improvement in system bit error rate (BER) performance by 14% as compared to RSBAS at SNR value of 0 dB. We presented a scenario where the energy harvesting at relay node offers saving the battery power at the user node. Hence, the presented analysis is applicable in communication with remote sensors. This paper also analyses that the BER is improved with the reduction in the distance between source and relay for the given value of energy harvesting efficiency.

本文考虑了一个在源端具有多个天线的协作无线系统。在源和目的地之间引入配备功率分配器的多天线中继。它利用接收到的信号中的能量进行放大并将其传输到目的地。诸如迫零（ZF）和最小均方误差（MMSE）之类的线性预编码技术用于减少干扰。我们比较两种天线选择技术即. 基于范数的天线选择 (NBAS) 和基于接收信噪比 (SNR) 的天线选择 (RSBAS)。据分析，NBAS 和 RSBAS 天线选择技术比随机天线选择技术提高了 20% 和 37%。但是，与 SNR 值为 0 dB 的 RSBAS 相比，天线选择技术 NBAS 可将系统误码率 (BER) 性能提高 14%。我们提出了一个场景，其中中继节点的能量收集可以节省用户节点的电池电量。因此，所提出的分析适用于与远程传感器的通信。本文还分析了对于给定的能量收集效率值，随着源和中继之间距离的减小，BER 得到改善。