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This paper introduces the recent development of GaN HEMT track-and-hold sampling circuits (THSCs) with a digital post-correction (DPC) technique for emerging applications. Compared to THSCs in silicon technologies, GaN THSCs achieve 20–30 dB higher signal-to-noise ratio (SNR) for a given bandwidth. Nevertheless, GaN THSCs suffer from dynamic nonlinearity due to charge trapping and introduce low-frequency...
In cognitive radio (CR), spectrum sensing plays a fundamental and critical role. This paper deals with the issue of spectrum sensing in a distributed CR network, and proposes a novel relay based cooperative spectrum sensing method, which makes one secondary user (SU) with higher signal-to-noise ratio spend part of its sensing time acting as the relay node. Different from conventional relay based methods,...
Due to the difficulties in characterizing the exact statistics' distributions, the decision thresholds obtained so far for the generalized likelihood ratio test (GLRT) detectors, used for the spectrum sensing in cognitive radio (CR), are based on the assumption that the sample size is large while the sample dimension is small. No investigations appear to have been made into the accuracy of these thresholds...
Energy detection based collaborative spectrum sensing algorithm is recently studied widely for primary signals detection in cognitive radio. However, one major disadvantage of those detectors is that their performance degrades in the presence of noise uncertainty which is inevitable in practical system. In this paper, we introduce a novel statistical covariance matrix based collaborative spectrum...
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