Dynamic Channel Allocation and Space-Time LMMSE Joint Detection in a TDD/CDMA Cellular Network with Traffic Asymmetry

Abstract—In a TDD/CDMA network with variable traffic asymmetry across cells, dynamic channel allocation (DCA) enhances resource utilization compared to fixed channel allocation (FCA). However, it also induces crossed-slot intercell interference, which can severely degrade the system performance. To tackle this problem, we propose a scheme that combines a decentralized interference-aware DCA algorithm with spacetime LMMSE joint detection at the receivers. Thus, crossed-slot interference is initially mitigated at the resource allocation layer and, then, residual intercell interference is suppressed (along with intersymbol and intracell interference) at the physical layer. The uplink performance of this scheme is evaluated in terms of SINR outage and average throughput via system-level simulations and is compared to that of benchmark random DCA and FCA schemes. The proposed scheme is shown to outperform random DCA and achieve a considerable throughput gain over FCA, that increases with the number of receive antennas. I