A Selective Relay Mechanism Combined with Analog Network Coding Technology
Peng Yue-xing · Journal of China Academy of Electronics and Information Technology · 2010
Beijing University of Posts Telecommunications,Beijing 100876,China)For the one-way relay cooperative system which works on the pattern of time division half-duplex,a selective relay mechanism combined with analog network coding(ANC) technology is proposed.The relay selects the forwarding strategy from four options adaptively,which is based on the cyclical redundancy check results of the data received in the current frame and the previous one.In this design,error propagation can be avoided,and the diversity gain can also be maximized.ANC employs the form of symbol-level linear superposition,and the incorporation of constellation rotation can guarantee that the two frames' data involved in ANC have equal powers and full differentiation as well.An adaptive linear detection algorithm is adopted at the receiver,thus the interference between the data of two adjacent frames can be eliminated with the lowest decoding complexity.Theoretical analysis and simulation results show that,compared with the selective decode and forward mechanism,the proposed one has notable superiority both in the performance of block error ratio and throughput,and this superiority increases with the channel quality of the source-to-relay link.