中文摘要：

对高速无线局域网IEEE802．11b的补码键控（complementary code keying，CCK）调制在多径衰落信道条件下的性能进行了研究．推导了误码字率和误比特率闭合表达式．根据补码的结构和多径信道模型，得出发送信号和接收信号的表达式；根据补码性质和解调规则，推导出码字相关器输出信号和输出信噪比，以及多径衰落信道条件下的误码字率和误比特率表达式；再根据IEEE802．11b标准的11Mbps DSSS物理层规范构建链路进行仿真，给出了理论曲线与仿真曲线．两者比较表明导出的公式较为准确．

英文摘要：

The performance of complementary code keying （CCK） modulation adopted in IEEE Standard 802.11b was investigated under multipath Rayleigh fading channel condition, and the closed-form expressions of bit error rate （BER） and codeword error rate （CWER） were derived. The mathematical descriptions of the transmitted signal and received signal were presented according to complementary code structure and multipath channel model. The expressions of the signal and signal-to-noise ratio at the correlator output were derived from the complementary code properties and CCK demodulation regulation. The closed-form expressions of BER and CWER were then obtained. Simulation link of IEEE Standard 802.11b 11 Mbps direct sequence spread spectrum （DSSS） baseband was constructed over CCSS platform. BER and CWER curves were obtained through numerical calculations and simulations. The validity of the formulae was proved by agreement of the numerical and simulation results.