无线数据通信网中的信道接入协议研究

信道接入协议（MAC）是无线数据通信协议的重要组成部分。由于无线信道是一个开放、共享的信道，网络节点在通信过程中存在隐终端和暴露终端问题。基于目前无线通信常用的MAC协议存在的问题，着重分析了基于扩频码的信道接入协议，该协议利用扩频码的正变特性，使得网络中各节点可以同时占用信道而互不干扰，较好地解决了信道争用问题，提高了系统效率。同时指出，在选择MAC协议时，应根据无线网络的拓扑结构及特点灵活选择，以提高网络性能。

The Research of MAC Protocol for Wireless Data Communication Network

Medium access control (MAC) protocol is an important component of the wireless data communication protocols.As wireless channel is an open and shared channel,there are hidden terminal and exposed terminal problems in the wireless data communication.This paper describes the common medium access control (MAC) protocols used in current wireless data communication network,points out its drawbacks,and at the same time,analyzes carefully the MAC protocol based-on spread spectrum code.Not only can it solve the problem of channels collision,but also it enhances the system efficiency.At last,it points out that appropriate MAC protocol should be selected for a wireless data communication network according to its topology and characteristics.