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在无线多址信道环境下,为了充分利用协作分集技术提高系统的传输速率和通信质量,引入了多址接入中继信道(MARC)模型。通过加入一个专门的中继节点,MARC模型中的发送节点类似操作在普通的多址信道下,从而使得现有的系统可平滑过渡到协作系统,实用性强。把MARC模型应用在直序扩频CDMA系统中,在Rayleigh信道下对其误码率进行仿真,结果表明,采用MARC模型的协作网络能获得显著的性能增益。
In wireless multiple access channel environment, in order to make full use of cooperative diversity technology to improve the system’s transmission rate and communication quality, a multiple access relay channel (MARC) model is introduced. By adding a dedicated relay node, the sending node in the MARC model operates similarly on a common multiple access channel, so that the existing system can be smoothly transitioned to a collaborative system with strong practicability. The MARC model is applied to CDMA systems with direct sequence spread spectrum. The BER of the system is simulated under the Rayleigh channel. The results show that the cooperative network with MARC model can obtain significant performance gain.