Alamouti-type wireless communication systems with one-bit feedback

The use of one-bit channel state feedback with the Alamouti-type wireless link using two transmit and one receive antennas is studied. An exact analysis of the symbol error rate (SER) is presented for several alternative schemes: the standard Alamouti system without feedback as well as three different systems with one-bit feedback. Later schemes involve systems with transmit antenna selection, diagonal weighting, and power control at the transmitter. Our study shows that quite significant performance improvements can be obtained by exploiting one-bit feedback if it is (nearly) perfect. However, if the feedback is unreliable then the performance of the methods designed under the perfect feedback assumption deteriorates substantially and can be even worse than that of the standard Alamouti system without feedback. To improve the performance of the feedback-based schemes in the imperfect feedback case, we propose new robust modifications of the one-bit feedback-based Alamouti-type schemes. Thus robust technique takes the advantages of reliable feedback knowledge.