MIMO model for improving spectrum efficiency of OFDM-CDMA system with pilot tone
Keywords:
MIMO, OFDM, CDMA, spectrum efficiencyAbstract
In this paper, the model for improving spectrum efficiency of the pilot aided OFDMCDMA downlink system with threshold detection combining (optimum TDC), is presented. The proposed MIMO OFDM-CDMA system uses space-time block coding applied to two and four transmit antennas and has arbitrary number of receive antennas. Bit error rate (BER) performance of the two competitive systems, in the case of Ricean frequency selective fading, is evaluated using originally developed computer simulation. The results show that besides smaller frequency bandwidth, the presented system provides lower BER, in comparison with its competitive solution.
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