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Cooperative Hybrid-ARQ Protocol Based on Network Coding |
Sun Yue; Li Ying; Wang Xin-mei |
State Key Lab of Integrated Service Networks, Xidian Univ., Xi'an 710071, China |
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Abstract A novel cooperative Hybrid-ARQ protocol is presented on the basis of network coding. Two users communicate with the base station with the assistance of a relay node. Relay node responds the repeat request and processes two users’ incremental redundancy frames with physical-layer network coding, i.e. signal superposition modulation, before transmitting to the base station. Multi-user joint detection and joint soft decision decoding are adopted at the base station. Compared with traditional Hybrid-ARQ protocol, the proposed cooperative Hybrid-ARQ protocol can achieve better performance on flat Rayleigh fading channel, and approximates the performance of cooperative Hybrid-ARQ protocol without network coding with fewer hardware and bandwidth resources.
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Received: 20 January 2009
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