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Investigating the relation between optimum guard interval and channel delay spread for a MC-CDMA system
This paper demonstrates a novel approach to determining the optimum guard interval for a multicarrier
code division multiple access (MC-CDMA) system. Analytical expressions for useful and interference power
are derived as a basis for comparison. From these, an expression for the signal-to-noise ratio of a detected
bit is derived and used to determine the optimum guard interval for a given channel profile and system
parameters. In contrast to other works, we use channel models based on actual measurements and we highlight important differences from theoretical models to support our approach. From our results, we propose an empirical rule for optimum guard intervals given prevailing channel parameters. We show that the optimum
guard interval can be selected as the delay window that includes 95% and 99% multipath power for Es /N0
= 10 dB and Es /N0 = 20 dB, respectively. In our case, the optimum guard interval was between 2 Ď„rms
and 4 Ď„rms for Es /N0 = 10 dB and between 3 Ď„rms and 6.4 Ď„rms for Es/N0 = 20 dB
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