Cognitive CDMA Channelization

摘要

We consider the problem of simultaneous power and code-channel allocation of a secondary transmitter/receiver pair coexisting with a primary code-division-multiplexed (CDM) system. Our objective is to find the optimum transmitting power and code sequence of the secondary user that maximizes the signal-to-interference-plus-noise ratio (SINR) at the output of the maximum SINR linear receiver while, at the same time, the SINR of all primary users at the output of their max-SINR receiver is maintained above a certain threshold. This is an NP-hard non-convex optimization problem. In this paper, we propose a novel feasible suboptimum solution using semidefinite programming. Simulation studies illustrate the theoretical developments.