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2009
IEEE

Superimposed XOR: A New Physical Layer Network Coding Scheme for Two-Way Relay Channels

9 years 5 months ago
Superimposed XOR: A New Physical Layer Network Coding Scheme for Two-Way Relay Channels
— We present a new physical layer network coding (PLNC) scheme, called superimposed XOR, for two-way relay channels. The new scheme specifically takes into account the channel as well as information asymmetry in the broadcast phase of two-way relaying. It is based upon both bitwise XOR and symbol-level superposition coding. We first derive its achievable rate regions when integrated with two known time control protocols over Gaussian channels. We then demonstrate its average maximum sum-rate and service delay performance over fading channels. Compared with the existing bitwise XOR and symbol-level superposition coding, the proposed superimposed XOR scheme achieves larger rate region in asymmetric channels. As a result, it performs much better in terms of averaged maximum sum-rate and service delay over fading channels. Numerical results also show that the proposed practical PLNC closely approaches the capacity bound given by the informationtheoretic random binning.
Jianquan Liu, Meixia Tao, Youyun Xu, Xiaodong Wang
Added 20 May 2010
Updated 20 May 2010
Type Conference
Year 2009
Where GLOBECOM
Authors Jianquan Liu, Meixia Tao, Youyun Xu, Xiaodong Wang
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