The performance of digital and analogue direct-detection optical receivers with space diversity reception is analysed. The cumulative probability distribution of the received signal is calculated for M-branch selection diversity and equal-gain combining diversity receivers. For a given probability of detection, the permissible threshold detection level is shown to increase with the number of diversity branches. The improvement in carrier-to-noise ratio (CNR) is shown to be higher for selection diversity compared to combining diversity detection. Optimum diversity array spacing is calculated; this shows the practicality of space diversity systems.
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Ibrahim et al. (1996) studied this question.
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