一种基于振幅比较的UWB信号解调方法

Demodulation Method for UWB Signal Based on Amplitude Comparison

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-wideband,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UWB系统设计的目标。提出了一种基于振幅比较的UWB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5dB以上的误码性能;而与相关检测相比,误码性能约降低了2dB,但复杂度低于相关检测。

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 UWB system design goals.A novel demodulation algorithm for UWB 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 position 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 performance（over 5dB）than the square law detection with a little expense of complexity,and reduce complexity in comparison with coherent detection but less than 2dB performance degradation.