Performance of adaptive filter used in CDMA system for Multiple Access Interference Suppressing

摘要

In a Code Division Multiple Access (CDMA) system all users share the same frequency band and they are separated from each other by (quasi)-orthogonal spreading codes. However, on dispersive broadband channels the orthogonality among codes is disrupted and Multi-user Access Interference (MAI) is present on the received signal. Moreover, interference among symbols and chips of the same user arises. One of the most common solutions to suppress the MAI is the use of adaptive filter. A single-user receiver based on a linear filter that minimizes the mean square error between the output and the transmitted symbols of the user of interest. This paper focuses on the performance of the adaptive filter.