Space-Frequency Coded BS-CDMA for Broadband Mobile Communication Systems

Space-time coded block spread CDMA (STC BS-CDMA) was previously proposed to enhance the advantages offered by CDMA system with block processing. However, STC BS-CDMA suffers from long decoding delay and large single block transmission time which makes it unsuitable for communication systems delivering delay-critical applications and poor performance in systems with high mobility conditions. This paper proposes space-frequency coded BS-CDMA (SFC BS-CDMA) which performs space-frequency coding instead of space-time encoding. This reduces the decoding delay significantly and transmission time of a single block, making it an attractive alternative in delay-critical communication systems. This paper also compares the two MIMO BS-CDMA systems and provides extensive simulation results.