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This paper investigates the interference cancellation for a cognitive radio based CDMA system, and the object is to reduce the interference both to the primary and the cognitive users. We propose a beamforming scheme in which the cognitive users operate in the licensed band without causing any interference to the primary user, while employing the interference cancellation technology at the receive...
Two power control schemes for CDMA systems using a MIMO-based space-time signal processing technique, space-time mapping (STM), are proposed in this paper under slow fading scenarios, both for an individual link and in the presence of intra-cell interferers. Simulation results show that the proposed schemes provide a significant reduction in the bit error rate (BER) compared to that of no power control.
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