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On the optimum number of OFDM subcarriers in fast Rayleigh fading channels

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3 Author(s)
Huang, L.C. ; Department of Electrical and Computer Engineering, National University of Singapore, Singapore, 119260 ; Tjhung, T.T. ; Lu, J.

In this paper, we consider the problem of selecting the number of subcarriers for an OFDM-MDPSK system when the delay spread of a multipath fading channel varies with the existing mobile environment. In our recent analysis [1], we have shown that there are two distinct BER performance behaviors dependent on whether the guard interval is larger or smaller than the delay spread. In this paper, by associating a probability that relates randomly varying channel delay spread to the designed guard period in the average BER computation, we present a step by step procedure to select the most suitable number of subcarriers, and other important parameters for the OFDM-MDPSK system.

Published in:

Communications and Networks, Journal of  (Volume:3 ,  Issue: 2 )