An Efficient Pilot Scheme in Large-Scale Two-Way Relay Systems

作者：Zheng Xiaojun; Liu Erwu^*; Zhang Zhengqing; Qu Xinyu; Wang Rui; Yin Xuefeng; Liu Fuqiang

来源：IEEE Communications Letters, 2015, 19(6): 1061-1064.

DOI：10.1109/LCOMM.2015.2423670

• Pilot scheme
• massive MIMO
• relay system

This letter considers an efficient pilot scheme for two-way relay system with massive antennas in the relay base station (BS). For such a system, we prove that user terminals (UTs) in the same communication pair can reuse the pilot sequence without performance loss. Hence, only K pilot symbols are required to support 2K UTs while 2K pilot symbols are needed in conventional cases. We analyze the asymptotic performance when the BS's antenna number grows infinite. In such a case, the inter-pair interference and noise vanish, and the self-interference determined by the second-order statistics of channel vectors can be feasibly tackled. In this way, the desired signal can be obtained by subtracting the self-interference from the received signal, and the capacity increases with the BS's antenna number.

• 出版日期2015-6
• 单位同济大学