SUMMARYIn this paper, a novel approach to the problem of estimating the average channel capacity (in the Shannon sense) assigned to each user of a spread spectrum (SS) multiple-input multiple-output (MIMO) system operating in a Rayleigh fading environment, is presented. The analysis leads to a closed-form expression which fully conforms to the upper bound of the channel capacity value of a non-fading AWGN channel when the transmitted signal bandwidth tends to infinity proving the validity of the described analysis.
The theoretically achievable average channel capacity (in the Shannon sense) per user of a hybrid cellular direct sequence/fast frequency hopping code-division multiple-access (DS/FFH-CDMA) system, operating in a Rayleigh fading environment, was examined. The analysis covers the downlink transmission and leads to the derivation of a novel expression between the average channel capacity available to each system's user under simultaneous optimal power and rate adaptation and the system's parameters, providing an optimistic upper bound, useful for practical modulation and coding schemes. The final derived closed-form expression can be useful for the design of the DS/FFH-CDMA system because it provides a theoretical tool for the initial quantitative analysis. Finally, avoiding the application of complex theoretical algorithm or lengthy simulation, we theoretically derived numerical results to illustrate the presented analysis. . His current research interests include wireless communications, information theory, channel capacity of multipath fading channels, multicarrier modulation techniques, and spectral efficiency of multiple-access schemes. He has authored and/or co-authored more than 30 papers in international journals and conferences. He also acts as a reviewer for several international journals and conferences.
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