On capacity of cognitive radio networks with average interference power constraints
IEEE Transactions on Wireless Communications
Cognitive radio: an information-theoretic perspective
IEEE Transactions on Information Theory
On ergodic sum capacity of fading cognitive multiple-access and broadcast channels
IEEE Transactions on Information Theory
On the statistics of cognitive radio capacity in shadowing and fast fading environments
IEEE Transactions on Wireless Communications
Capacity of fading channels with channel side information
IEEE Transactions on Information Theory
Achievable rates in cognitive radio channels
IEEE Transactions on Information Theory
Capacity of a Class of Cognitive Radio Channels: Interference Channels With Degraded Message Sets
IEEE Transactions on Information Theory
The capacity for a discrete-state code division multiple-access channel
IEEE Journal on Selected Areas in Communications
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The problem of estimating the optimum radio capacity of a spread spectrum non-cellular Cognitive Radio (CR) system, operating in a Rayleigh fading environment, is examined. The optimization is based on the maximization of the average channel capacity (in the Shannon-Hartley sense) available to primary user. In this work, the system's radio capacity is expressed in terms of the number of simultaneously transmitting secondary users but considering only one primary user which receives the spread spectrum simultaneously transmitted signals, through an optimum maximal-ratio combiner (MRC) RAKE receiver. Finally, the theoretical analysis leads to a simple but novel closed-form expression, for the optimum radio capacity, which can be useful for the practical design of a non-cellular CR system and for an initial quantitative analysis. In addition, numerical results are presented to prove and illustrate the validity of the considered model.