基于OFDM系统的随机信道接入方案

A Random Access Mechanism Based on OFDM System

双忙音多址信道接入(DBTMA)协议是一种信道利用率较高的无线局域网信道随机接入控制方案。但是, 该协议的硬件实现复杂度较高。该文在对DBTMA协议进行简单修改的基础上,结合节能意识多址接入(PAMAS) 协议提出了一种基于OFDM系统的DBTMA信道接入系统,并对此系统做了简要分析。分析结果显示,该文提出的随机信道接入系统的性能良好且实现方式简单。

A MAC protocol, termed Dual Busy Tone Multiple Access(DBTMA), is a random access mechanism with high channel utilization for WLAN. However, it is difficult to realize the protocol with hardware. This paper proposes a new random access mechanism based on OFDM system by making simple modification on DBTMA and integrating it with power awase multi-access protocol with signalling. Furthermore, the new protocol is analysed and the result indicates that the proposed random access system shows well performance and is easy to be realized.