Second , the transmission and reception models of basedband cdma system based on complete complementary codes in up - and downlink are discussed and its performance in awgn channel is analyzed and evaluated through simulation . third , a receiver for multipath signal reception is investigated , which consists of two matched filters : one for channel impulse response estimation and the other for data detection 接下来，对基于完全互补码的基带cdma系统上行链路和下行链路发送与接收模型进行了讨论，分析了该系统下行链路在awgn信道中的系统性能，并对该系统上行链路和下行链路在awgn信道中进行了仿真。
After elaborating the principle of an 802 . lib key modulation scheme - complementary code keying ( cck ) , this paper proposes and realizes a hardware circuit solution of 802 . 11b pcmcia wlan interface card , which can reliably offer a maximal 11mbps data rate and freely switch within 14 working channels in 2 . 4ghz frequency band 接着在详细阐述了802 . 11b协议核心调制技术?互补码键控( cck )的原理的基础上，本文提出并实现了一种峰值传输速率为11mbps的802 . 11bpcmcia高速无线网卡的硬件电路设计方案，在2 . 4ghz频段该网卡可在14个工作信道上自动切换，实现高速突发数据的可靠传输。
