Spectrum Sensing Using Phase Inversion Based on Space Diversity with Over Three Antennas

Shusuke NARIEDA  Hiroshi NARUSE  

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E102-A   No.8   pp.974-977
Publication Date: 2019/08/01
Online ISSN: 1745-1337
DOI: 10.1587/transfun.E102.A.974
Type of Manuscript: LETTER
Category: Communication Theory and Signals
cognitive radio networks,  spectrum sensing,  space diversity,  

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This letter presents a computational complexity reduction technique for space diversity based spectrum sensing when the number of receive antennas is greater than three (NR≥3 where NR is the number of receive antenna). The received signals are combined with phase inversion so as to not attenuate the combined signal, and a statistic for signal detection is computed from the combined signal. Because the computation of only one statistic is required regardless of the number of receive antenna, the complexity can be reduced. Numerical examples and simple analysis verify the effectiveness of the presented technique.