一种新的无线中继网络随机接入协议  

A new random access protocol for wireless relay network

作　　者：张超一[1] 武穆清[1] 宿景芳[1] 

机构地区：[1]北京邮电大学信息与通信工程学院,北京100876

出　　处：《沈阳工业大学学报》2012年第6期685-690,共6页Journal of Shenyang University of Technology

基　　金：国家科技重大专项基金资助项目(2011ZX03001-007-03)

摘　　要：针对无线中继网络多址接入的碰撞问题,提出了一种由固定中继节点支持的多址随机接入协议.中继网络中的节点采用非坚持监听方式随机接入,保证一定比率的通过量,中继节点存储剩余碰撞的分组数据包.在若干个连续时隙内,根据信道衰落系数的非相关性,中继节点将建立恢复原始数据的线性方程组,求解并恢复原始数据包.仿真结果表明,与同类算法相比,采用了非坚持监听方式,系统的吞吐量有较明显的提高;该方法不需要增加重传机制,节省了系统频谱资源;由于有中继存在,采用了不同路径传输,使信道参数不相关;接收端不需要增加天线等硬件设备,以便获得较高的分集增益.Aiming at the collision problem of multiple access in wireless relay network,a random multiple access protocol supported by fixed relay nodes was proposed.The random access in non-persistent monitoring mode was adopted for nodes in relay network,and a certain percentage of throughput was guaranteed.In addition,the relay nodes stored the remaining collision grouping data packets.In several consecutive time-slots,the relay nodes would establish the linear equations of restoring original data according to the noncorrelation of channel fading coefficients,and the original data packets were solved and restored.The simulation results show that compared with similar algorithms,the throughput of system is significantly improved due to the adoption of non-persistent monitoring mode.The proposed method does not need the retransmission mechanism,and saves the spectrum resources of system.Due to the existence of relay,the transmission with different paths is applied,which makes the channel parameter be unrelated.The receiving terminal does not need such hardware devices as antenna,and can acquire higher diversity gain.

关 键 词：随机多址接入 协议设计 中继网络 非坚持监听 碰撞 数据恢复 非相关 数字信号处理 

分 类 号：TN929.5[电子电信—通信与信息系统]