A spread spectrum wireless LAN based on interference cancellation techniques

This paper describes the evaluation of a direct sequence spread spectrum wireless LAN, based on interference cancellation techniques. Good orthogonality between spreading codes with near perfect average power control is essential for adequate spectrum efficiency in conventional CDMA applications but good average power control is often difficult to maintain. interference cancellation code division multiple access (IC-CDMA) is a method proposed for third generation mobile systems which considerably improves the user capacity of a spread spectrum system. A significant advantage of IC-CDMA is that it does not require equal received powers thereby eliminating the need for complex power control algorithms. The system design was evaluated using a simulation toolset which supports direct DSP implementations. The toolset, based on a hierarchical block diagram approach, was used to evaluate the performance of IC-CDMA for various system configurations and channel conditions. The results obtained illustrate that IC-CDMA, with some restrictions, is more suitable for a cellular application than conventional CDMA