In this contribution, time varying threshold sequential
detectors are employed for energy detection-based spectrum
sensing in low-SNR regimes. Sequential detection is proven to be
faster (on average) than any other multi-sample detector for a set
of given probabilities of detection and false-alarm. In this report,
exact performance of a sequential detector for spectrum sensing
is analyzed using the direct method. The theoretical results
presented herein are verified with Monte-Carlo simulations. It
is shown that for a SNR of −10 dB, among tests with Wald and
triangular thresholds with similar probabilities of mis-detection
and false-alarm, triangular performs 54% faster in terms of
maximum detection time (90 percentile)
