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Code selection and transmit antenna selection are widely used in limited feedback wireless systems. When one of the antenna channel gains is much higher than the other antenna channel gains; using antenna selection method increases received SNR at the receiver. However, when antenna channel gains are close to each other; using code selection method increases the received SNR at the receiver. In this paper, we propose an adaptive code and antenna selection scheme to increase the received SNR at the destination. In this technique, using one additional bit feedback yields improved SNR at the destination compared to using solely code or transmit antenna selection method. Detailed simulations show that adaptive code and antenna selection with four bit feedback yields a performance of the extended balanced space-time block coding with ideal feedback which requires exact channel state information at the transmitter.
Date of Conference: 22-24 April 2010