Elements of information theory
Elements of information theory
Personal communications systems applications
Personal communications systems applications
CDMA for Wireless Personal Communications
CDMA for Wireless Personal Communications
IEEE Transactions on Wireless Communications
Channel capacity of adaptive transmission with maximal ratio combining in correlated Rayleigh fading
IEEE Transactions on Wireless Communications
Capacity of fading channels with channel side information
IEEE Transactions on Information Theory
The impact of frequency-flat fading on the spectral efficiency of CDMA
IEEE Transactions on Information Theory
Families of sequences with optimal Hamming-correlation properties
IEEE Transactions on Information Theory
Slow frequency-hopping multicarrier DS-CDMA for transmission over Nakagami multipath fading channels
IEEE Journal on Selected Areas in Communications
Coherent Hybrid DS-SFH Spread-Spectrum Multiple-Access Communications
IEEE Journal on Selected Areas in Communications
IEEE Journal on Selected Areas in Communications
IEEE Journal on Selected Areas in Communications
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In this paper, the optimum value of the processing gain of a hybrid direct sequence/slow frequency hopping code division multiple access cellular system, when operating in a Rayleigh fading environment, is examined. The optimization is based on the maximization of the average spectral efficiency achieved, expressed in bits per second per Hertz, which is estimated in terms of the achievable average channel capacity (in the Shannon–Hartley theorem sense) per user during the operation over a broadcast cellular time-varying link. The analysis leads to a simple theoretical novel closed-form expression for the optimal processing gain that is related with the system's parameters but becomes independent of hopping frequencies assigned to each system's cell. Finally, the expression derived can be useful for the practical design of a direct sequence/slow frequency hopping code division multiple access cellular system and for an initial quantitative analysis. Numerical results are presented to illustrate the presented analysis. Copyright © 2011 John Wiley & Sons, Ltd.