Mimo block spread CDMA: system architecture and performance analysis for high rate wireless systems

Abstract

High speed wireless access of the order of Gbps is envisioned for future mobile communication systems. However, symbol duration decreases as transmission rate increases. As a result, the large number of multipaths makes the communication channel to be severely frequency-selective. Recently, the use of frequency-domain (FD) processing has been receiving a lot of attention and is seen as one of the most promising technique to overcome the frequency-selectivity problem. FD processing can be realized using either multicarrier scheme that is based on the orthogonal-frequency-division-multiplexing (OFDM) technique or single-carrier scheme that employs cyclic-prefix or guard intervals.