基于码匹配滤波的数字化直扩接收机

Digital direct-sequence spread-spectrum receiver basesd on code-matched-filtering

推导出了一种基于码匹配滤波的数字直扩接收机模型,该方法通过在解扩之前对本地扩频码进行匹配滤波实现对变带宽扩频信号的最佳接收。由于不需直接对输入基带信号进行滤波,而对本地扩频码的滤波又可以通过查表的方式实现,因此与传统的扩频接收机相比,占用的硬件资源大大减少。文中还提出了一种易于实现的次最佳方案。仿真结果表明,次最佳接收机的误码率性能和最佳接收机的误码率性能基本一致。

A digital direct-sequence spread-spectrum correlator receiver based on code-matched-filtering is derived. It achieves optimum performance in despreading spread-spectrum signal with varying bandwidth by filtering the local pseudonoise code with a filter matched with that of the transmitter. Compared with the conventional direct-sequence spread-spectrum receiver, it occupies less hardware because no filter is needed for the input baseband signal and the filtering of the local pseudonoise code can be implemented by a lookup-table. A sub-optimum scheme that is easy to be carried out is also presented. Simulation result shows that there is little difference between the performance of the sub-optimum receiver and that of the optimum receiver.