关键词: 中继, LDPC码, HARQ, 平均误码率, 吞吐量, 平均时延

Abstract:

Different relay nodes have different fading characteristics in establishing the communication channel,and the relay node can improve the wireless channel spatial diversity and the transmission performance of the entire link.The use of error-correction can improve transmission efficiency of the channel.The article introduces the multi-relays hybrid-ARQ system based on LDPC codes,which can transfer data more efficiently without reducing the transmission rate.Different number of relay nodes have different effect on the average of bit error rate,throughput and the average of delay of the system.Matlab simulation show that the system model can decrease the average of bit error rate and delay and improve throughput of the system.At the same time,the multi-relays cooperative Hybrid-ARQ system based on LDPC Codes is better than that of Turbo codes in dealing with long codes.

Key words: relay node;LDPC codes;Hybrid-ARQ;the average of bit error rate;throughput;the average of delay