The authors propose a novel use of complete complementary (CC) sequences for increased spectral efficiency in a multiple-input-multiple-output (MIMO) code division multiple access (CDMA) system. The new method overcomes many of the problems and limitations persistent in single-input-single-output (SISO) and proves that under the proposed MIMO CC-CDMA system, the capacity for the number of supported users increases linearly by the number of transmitters. The paper also shows that the MIMO CC-CDMA system demonstrates a superior performance over those using traditional Walsh spreading sequences (Walsh-CDMA). Results include the bit error rate comparison for CC-CDMA frequency selective fading channels and that of the Walsh-CDMA under flat fading channels.
In this paper, we present a Multiple-InputMultiple-Output (MIMO) Code-Division-Multiple-Access (CDMA) communication system based on Complete Complementary (CC) codes (CC-CDMA) in a timedispersive (i.e. frequency-selective fading) channel. This system utilizes a novel combination, which consists of orthogonal CC codes for data spreading and a suitably designed Multi-User-Detector (MUD) algoaithm, in order to enhance the current 3rd Generation (3G) mobile systems. The simulation results for the CC-CDMA system, obtained in a frequency-selective fading channel, reveal significant improvement in Bit-Error-Rate (BER) performance, and consequently the achieved High Data Rates (HDR) compared with a conventional Walsh codes based MIMO CDMA (Walsh-CDMA) system.
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