Greedy SINR maximization in collaborative multibase wireless systems
EURASIP Journal on Wireless Communications and Networking - Special issue on multiuser MIMO networks
EURASIP Journal on Wireless Communications and Networking - Special issue on innovative signal transmission and detection techniques for next generation cellular CDMA systems
MIMO transceiver design via majorization theory
Foundations and Trends in Communications and Information Theory
Power minimization for CDMA under colored noise
IEEE Transactions on Communications
New bounds on the total-squared-correlation of quaternary signature sets and optimal designs
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
Separable Convex Optimization Problems with Linear Ascending Constraints
SIAM Journal on Optimization
| Hi-index | 754.84 |
We consider direct sequence code division multiple access (DS-CDMA), modeling interference from users communicating with neighboring base stations by additive colored noise. We consider two types of receiver structures: first we consider the information-theoretically optimal receiver and use the sum capacity of the channel as our performance measure. Second, we consider the linear minimum mean square error (LMMSE) receiver and use the signal-to-interference ratio (SIR) of the estimate of the symbol transmitted as our performance measure. Our main result is a constructive characterization of the possible performance in both these scenarios. A central contribution of this characterization is the derivation of a qualitative feature of the optimal performance measure in both the scenarios studied. We show that the sum capacity is a saddle function: it is convex in the additive noise covariances and concave in the user received powers. In the linear receiver case, we show that the mini average power required to meet a set of target performance requirements of the users is a saddle function: it is convex in the additive noise covariances and concave in the set of performance requirements