Performance Analysis of MIMO Wavelet Packet Multicarrier Multicode CDMA System with Antenna Selection

Abstract

Performance of Multicarrier Multicode Code-Division Multiple Access (MC/MCD-CDMA) systems can be improved significantly by using Wavelet Packets (WPs) as subcarriers instead of a sinusoidal function. This is because WPs have much lower side-lobes and negligible sidelobe energy leakage compared to sinusoidal carriers; this property significantly decreases the intercarrier interference and improves the system performance. Further improvement can be achieved by utilizing multiple antennas at transmitter and receiver to construct a Multiple-Input Multiple-Output (MIMO) system. Channel hardening is the main drawback of MIMO systems. Antenna selection can be employed to reduce this problem. In this paper, we use the an-tenna selection in MIMO WP-MC/MCD-CDMA sys-tem. These combinations of antenna selection, MIMO, and WP in MC/MCD-CDMA improve the system per-formance significantly and reduce the channel harden-ing. The performance of the system is tested accord-ing to the outage probability and bit error rate. Two MIMO schemes on Nakagamim fading channel are considered, which are: selective transmit /selective re-ceive and selective transmit /maximum ratio combining receive. The study includes the effects antennas’ number, fading parameter-m, number of users, and the threshold signal to interferences plus noise ratio. The performance of the system is compared to that of MC/MCD-CDMA based on a sinusoidal carrier. The results reveal that: by increasing antennas’ number, the system performance is improved significantly, and MC/MCD-CDMA system based on WPs carriers out-performs MC/MCD-CDMA system based on a sinusoidal carrier