Digital direct-sequence spread-spectrum receiver basesd on code-matched-filtering
Qinglin Liang · Journal of China Institute of Communications · 2003
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.