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Cognitive radio (CR) is a novel approach to improving the spectral efficiency of licensed radio frequency bands by opportunistically accessing unused portions of the band without introducing interference to a licensed user. To reliably identify unused portions in a dynamic environment, a collaborative spectrum sensing (CSS) approach is known to be advantageous. In this article we will consider a weighted...
DS-CDMA is widely used in 3G communication systems, GPS, WLAN and some other fields that require robust resistance against narrow band interference, multi-path time spread or interception. One most challenging and important problem in DS-CDMA is code synchronization, which includes code acquisition and code track. When SNR of the received signal is low, the synchronization becomes not very reliable,...
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