Mr. Richard J. Wright Profile

Richard J. Wright

at L3Harris Technologies Inc

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Proceedings Article | 21 May 2015 Paper

Simulating the performance of switched diversity with post-examining selection

Richard Wright

Proceedings Volume 9497, 94970V (2015) https://doi.org/10.1117/12.2179876

KEYWORDS: Signal to noise ratio, Frequency shift keying, Receivers, Switches, Device simulation, Signal attenuation, Distortion, MATLAB, Antennas, Transmitters

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Switched diversity is a solution to random attenuation of a signal due to fading channel distortion. It uses 2 or more identical branches, or antennas, to monitor the received signal. The main assumption is that the branches are uncorrelated. Switched diversity uses a switching threshold that is the criterion for an acceptable received signal path. In a traditional switched diversity scheme, if no acceptable path meets the threshold criterion, one is chosen randomly. We will look into a modified hybrid switched/selection scheme proposed in a separate paper by Yang and Alouini. This scheme will help the receiver pick the best path in conditions where all of the channel conditions are poor. The proposed scheme, as proposed by Yang and Alouini, is called switch and examine combining with post-examining selection (SECps), which is a variant of switch and examine combining (SEC). We take the theoretical findings from Yang and Alouini’s paper and use MATLAB to validate the simulation against the closed form equations for DBPSK and Noncoherent demodulated FSK.

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