Carrier interferometry codes, applied to N-carrier MC-CDMA systems, enable 2N users to simultaneously share the system bandwidth with minimal degradation in performance (relative to the N orthogonal user case). This paper presents an analysis of crest factor considerations in MC-CDMA systems employing carrier interferometry codes. First, it is shown that the crest factor in downlink transmission demonstrates the desirable properties of low mean and low variance. Next, the poor crest factor observed in the uplink is characterized and it is shown how this can be effectively combated by use of Schroeder's analytical crest factor reduction techniques.
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