一种基于振幅比较的UWB信号解调方法

无传统意义上的载波带来的低复杂度特性是脉冲无线电超宽带(ultra widcband, UWB)通信的一大优势，既有较佳的接收性能又有简单的结构是UWI3系统设计的目标。提出了一种基于振幅比较的UWI3信号接收的解调方法，即在脉冲位置调制中的特定位置，分别对脉冲的正负半周积分获得振幅信息，并通过比较这些振幅解调出符号信息。该方法能够在接收性能和系统复杂性之间获得较好的平衡。结果表明，它以较小的复杂性代价换取了比平方律检测好5 dI3以上的误码性能;而与相关检测相比，误码性能约降低了2 dI3，但复杂度低于相关检测。

(Dept. of Electronics and Information Engineering, Huazhong University oI Science and Technology, Wuhan 430074, China)

The lower complexity is an outstanding advantage of impulse radio ultra wideband(UWB) communication due to traditional carrier free. Both better performance and a simple receiver structure are the UWI3 system design goals. A novel demodulation algorithm for UWI3 signal reception based on amplitude comparison was proposed. The pulse amplitudes were obtained by integrating positive and negative half cycle of the pulse respectively at special posilion in pulse position modulation scheme, and then the binary symbol was demodulated by comparing their amplitudes.The receiver can get a better balance between reception performance and system complexity by using this method. The results show that the proposed method can remarkably obtain better bit error ratio performanee(over 5dB) than thesquare law detection with a little expense of complexity, and reduce complexity in comparison with coherent detection but less than 2dB performance degradation.