Abstract
The performance of multicarrier systems depends on the propagation channel behavior. The latter is subject to time and/or frequency selectivity. The designer has to select properly the guard interval and the number of carriers for a given system bandwidth to combat the channel dispersiveness. In this paper we investigate the sensitivity of MultiCarrier Code Division Multiple Access (MC-CDMA) performance to these parameters in different environments. We derive closed form expressions of the useful and the different interference powers after Maximum Ratio Combining (MRC) and despreading. The optimum parameters correspond to the minimum of the Signal to Noise Ratio Degradation (SNRD). It turns out that the derivations in (1) restricted to the Orthogonal Frequency Division Multiplexing (OFDM) system, are a particular case of our results. Numerical evaluation of the analytical expressions reveals that the optimum parameters of the MC-CDMA and its corresponding OFDM system are similar and depend in the same way on the channel characteristics.
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