Applying the DCMP adaptive array to the OFDM-CDMA systems

It is known that DS/CDMA has extremely good interference; suppression chara cteristics. However, due to the correlation of the spreading code, interfer ence occurs and the communication quality is degraded. In order to resolve this problem, various systems have been proposed that suppress interference by means of adaptive arrays. In this paper, we propose a system for operat ing a DCMP adaptive array based on estimation of the array propagation vect or of the desired signals in the OFDM-CDMA communication system by the ESPR IT algorithm. In this application, correlation between the arriving waves i s suppressed by adaptive spatial smoothing using the frequency characterist ics of the OFDM signals. In order to determine the effectiveness of the pro posed system, a computer simulation is used for analysis of the fundamental characteristics and the nature of the mutual coupling between elements. It is found that the system works well as a DCMP adaptive array and that sepa rated reception of correlated multiple waves is possible. (C) 2001 Scripta Technica, Electron Comm Jpn Pt.