Reduced Feedback Rate Schemes for Transmit Antenna Selection With Alamouti Coding

In this paper, we propose and analyze two novel reduced feedback rate schemes for transmit antenna selection (TAS) for multiple-input multiple-output systems. A detailed analysis and comparison of bit error performance, outage probability, and the feedback rate of the proposed TAS schemes are presented. The performance comparison of the proposed schemes with conventional and other well-known TAS schemes in literature is presented along with their pictorial representations. Using order statistics and moment generating function, an exact expression for bit error rate performance and outage probability for a special case of the proposed schemes with binary phase shift keying modulation has been derived and substantiated with numerical results through simulations. The results show that the proposed schemes successfully trade-offs the error performance loss with feedback rate of a TAS system in an optimum manner compared to previously reported schemes. The proposed schemes can play a crucial role in envisioned 5G communications where small, low power, robust systems will be required for varied applications. The proposed transmit antenna selection schemes can also be easily integrated with non-orthogonal multiplexing systems to improve their error performance.