Noncoherent Detection of BFSK Signals with Linear and Nonlinear Diversity Combining Over Rician Fading Channels with Partial Band Interference
NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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A performance analysis of Binary Orthogonal Frequency Shift Keying BFSK Fast Frequency Hopped FFH receivers implemented with both square-law and envelope detectors is performed. Bit error probabilities of the two types of receivers for linear combining, noise-normalization combining, and self- normalization combining under worst-case partial-band interference with nonselective Rician fading and thermal noise compared. The analysis is repeated for the case of no interference to point out the effect of fading. A study of nonlinear diversity combining receivers self-normalization and noise- normalization is also performed for a system model that is free from thermal noise. Envelope and square-law detectors for particular types of nonlinear combining investigated do not differ in performance, but this is not true for linear combining detectors. The visible superiority of envelope detectors for linear combining is noted. Nonlinear combining receivers achieve a diversity and performance improvement compared to linear combining receivers.