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This paper is concerned with the study of fast-frequency-hopped spread-spectrum multiple-access (FFH-SSMA) digital systems employing antenna diversity and noncoherent binary frequency-shift-keying (FSK) modulation operating through an indoor radio multipath Rayleigh channel. The diversity technique of equal gain combing (EGC) is considered in our study. It is assumed that the frequency-hopping rate is equal to the bit rate.