无线ATC中802.11b信道编码系统的改进

Improvement of Channel Coding System for 802.11b in Wireless ATC

IEEE802.11b是现在应用最广泛的无线局域网协议,带宽只有83.5MHz。为了达到较高的数据传输率,它只采用了CRC-32(循环冗余检验码),而并没有采用其它差错控制编码。当信道环境不理想时,误码率很高,QoS性能没有保证。无线ATC的数据传输率很低,但对QoS性能要求却很高。根据这些特点,本文对要传输的信息增加差错控制编码,提出了具体的编码方案。仿真实验表明,改进之后,IEEE802.11b的QoS性能得到了显著地提高。

At present, IEEE802.11b is the most broadly used protocol, and its bandwidth is only 83.5MHz .To get high data transmis- sion rate, it doesn’t use any error detecting and correcting coding except of CRC- 32 (Cyclic Redundancy Check Code). When the channel is not ideal, the bit error rate of system is high and its QoS can not be ensured. Based of these characteristics, it adds error detecting and correcting coding for the information which will be transferred, and provide coding scheme in this paper. Simulat...