Channel quantization-based physical-layer network coding for two-way relay STBC system

Springer Science and Business Media LLC - Tập 5 - Trang 59-66 - 2017
Huu Minh Nguyen1, Xuan Nam Tran1, Van Bien Pham2, The Nghiep Tran1
1Faculty of Radio-Electronics, Le Quy Don Technical University, Hanoi, Vietnam
2Vietnam People’s Army Broadcast Center, Hanoi, Vietnam

Tóm tắt

Wireless multiple-input multiple-output (MIMO) two-way relay systems have received increasing attention recently. In a simple two-hop relay system, physical-layer network coding (PNC) is an effective scheme for relay to map the transmitted symbols from two terminal nodes into the network coded symbol. This paper considers a two-hop two-way relay system which uses the Alamouti space-time code for signaling between all nodes and channel quantization for PNC mapping at the relay. Specifically, based on the concept of CQ-PNC we derive a PNC mapping rule for two pairs of network coded symbols. An adaptive mapping scheme based on minimum residual interference power is introduced to reduce the effect of quantization error. Finally, a relay selection method based on minimum residual interference power is proposed as a means to increase the system performance.

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