基于LDPC码的多中继HARQ系统研究

根据不同中继节点建立的通信信道衰落特性的不同,利用中继节点可增强无线信道空间分集,提高整个链路的传输性能。纠错码的使用可更有效地提高信道传输效率的特点。文中介绍了基于LDPC码的多中继HARQ系统模型,在不降低传输速率的条件下,可更高效地传输数据。利用Matlab仿真了不同中继个数对系统平均误码率、吞吐量以及平均时延产生的不同影响,仿真结果表明,采用该系统模型可降低系统的平均误码率和平均时延,提高了系统的吞吐量。同时在码长较长的情况下,采用LDPC码的多中继HARQ系统性能优于采用Turbo码的多中继HARQ系统性能。

LDPC Codes Relay HARQ System

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.