On suboptimum receivers for DS-CDMA with BPSK modulation
Signal Processing
Widely-linear filtering and non-cooperative transceiver optimization in wireless data networks
GameNets'09 Proceedings of the First ICST international conference on Game Theory for Networks
SARNOFF'09 Proceedings of the 32nd international conference on Sarnoff symposium
IEEE Transactions on Information Theory
| Hi-index | 754.90 |
It has been shown that in a direct-sequence/code-division multiple-access (DS/CDMA) system employing binary phase-shift keying (BPSK) modulation the baseband equivalent of the CDMA multiplex is, under very mild assumptions, an improper complex random process, i.e., it has a nonzero pseudoautocorrelation function. The problem of linear multiuser detection for asynchronous DS/CDMA systems with improper multiaccess interference (MAI) is considered. A new mean-output-energy (MOE) cost function is introduced, whose constrained minimization leads to two new linear multiuser detectors, exploiting the information contained in the pseudoautocorrelation of the observables, and which generalize the classical decorrelating and minimum mean-square error (MMSE) receivers. The problem of blind adaptive receiver implementation based on subspace tracking is also tackled. Finally, the superiority of the new detectors with respect to the classical linear detection structures present in the literature is demonstrated through both theoretical considerations and computer simulations