衰落信道下捕获效应对PRMA/CR-PRMA性能的影响

Capture effect on PRMA/CR-PRMA in Rayleigh fading channel

前人在分析 PRMA(Packet Reservation Multiple Access)协议性能时 ,都假设理想信道条件[1～ 3] ,即无传输差错、信道无衰落 ,各分组到达接收机的功率相近。这种假设简化了分析 ,但与实际物理信道模型不符。本文首次分析了在瑞利衰落信道下的 PRMA及 CR- PRMA[4] (Collision Reduction- Packet Reservation Multiple Access)的性能 。

It is always assumed that the channel is perfect when the PRMA is considered for the purpose of calculation simplification. Under this assumption, there is no fade and transmission error, and an all packets arriving at the receiver occurred with similar power level, which is disagreement with the real transmission channel. In this paper, the performance of PRMA and CR PRMA with the Rayleigh fading and capture effect has been analyzed, and compared them with those in perfect channel.