Spreading Code and Widely-Linear Receiver Design: Non-Cooperative Games for Wireless CDMA Networks

TL;DR

This paper investigates non-cooperative transceiver optimization in multiuser wireless CDMA networks using widely-linear detection, demonstrating significant performance improvements by exploiting the improper nature of complex signals.

Contribution

It introduces a complex baseband model for non-cooperative game-based transceiver optimization with widely-linear detection, highlighting performance gains over real signal models.

Findings

Widely-linear detection improves system performance.

Exploiting signal impropriety yields significant gains.

Theoretical analysis aligns with numerical results.

Abstract

The issue of non-cooperative transceiver optimization in the uplink of a multiuser wireless code division multiple access data network with widely-linear detection at the receiver is considered. 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 resource allocation games are considered for this new scenario, and the performance gains granted by the use of widely-linear detection are assessed through theoretical analysis. Numerical results confirm the validity of the theoretical findings, and show that exploiting the improper nature of the data in non-cooperative resource allocation brings remarkable performance improvements in multiuser wireless systems.