Iterative transmitter and receiver optimization for CDMA networks
IEEE Transactions on Wireless Communications
Iterative construction of optimum signature sequence sets in synchronous CDMA systems
IEEE Transactions on Information Theory
CDMA codeword optimization: interference avoidance and convergence via class warfare
IEEE Transactions on Information Theory
A generalized minimum-mean-output-energy strategy for CDMA systems with improper MAI
IEEE Transactions on Information Theory
Ensuring convergence of the MMSE iteration for interference avoidance to the global optimum
IEEE Transactions on Information Theory
Joint Receiver and Transmitter Optimization for Energy-Efficient CDMA Communications
IEEE Journal on Selected Areas in Communications
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The issue of cross-layer spreading code optimization, widely-linear receiver choice and transmit power control for non-cooperative energy-efficiency maximization in CDMA-based wireless data networks is considered in this paper. While previous work in this area has focused on a simple real signal model, in this paper a baseband complex representation of the data is used, so as to properly take into account the I and Q components of the received signal. For the case in which the received signal is improper, a widely-linear reception structure, processing separately the data and their complex conjugates, is considered. Several non-cooperative games are considered, all of which are shown to admit Nash equilibria. Interestingly, it is found that spreading code optimization coupled with widely-linear filtering permits supporting, with no multiuser interference, a number of users that is twice the processing gain. Numerical results corroborate the validity of the theoretical analysis, and show that widely-linear filtering in the presence of improper data brings remarkable performance improvements with respect to conventional linear receivers.