新型高效编码调制方式

在无线局域网中有很多调制方式,每个方式有它自己的特点。补码键控被采用可支持5.5Mbps,11Mbps,22Mbps,33Mbps的数据速率。超过了以前无线局域网标准2Mbps的速率。但是CCK在室内多径环境下性能相当不好。文中一个新的调制方案是把网格编码和CCK调制结合起来提出来的。通过仿真,这种方式在中到大的时延扩展信道环境下表现比较好的误码性能。

A new coding modulation scheme with high efficiency

There are so many modulation ways in wireless local area net(WLAN),every kind of the ways has its characteristics.Complementary code keying(CCK) is adopted to support data rates up to 5.5Mbps,11Mbps,22Mbps and 33Mbps,much higher than the 2Mbps data rate in the previous wireless LAN standard.But the CCK performs quite poorly in the indoor multipath channels.In this paper,a new modulation scheme which combines the grid coding with the CCK modulation is proposed.Through simulation,it can achieve much better error rate performance in medium-to-large channel delay spread environments.