Performance of MMSE Detection in Cellular MC-CDMA with Layered Space-Frequency Coding
Jouko Leinonen, Zexian Li, Markku J. Juntti · 2006
The spectral resources of high capacity cellular networks are desired to be utilized efficiently using aggressive frequency reuse. The consequence of the frequency reuse in each cell is inter-cell interference. In this paper, we consider downlink multi-carrier code-division multiple-access (MC-CDMA) in a multi-cell environment. In order to achieve good error rate performance and high spectral efficiency, multiple transmit and receive antennas with strong space-frequency channel coding and layered space-time (LST) architecture are applied. We study the performance of the minimum mean squared error (MMSE) based receivers in interference limited environment. The inter-cell interference suppression in MMSE detection and iterative detection method with soft co-antenna interference (CAI) cancellation are considered. The results indicate that the considered MC-CDMA system requiring no channel knowledge at the transmitter is suitable for high date rate downlink packet transmission in a cellular environment with relative high user load. The inter-cell interference suppression in MMSE detection provides remarkable performance improvement, especially in the case of spatially correlated antennas.