Error probability analysis of TAS/MRC-based scheme for wireless networks [point-to-point link example]

We develop the framework to analyze the symbol-error probability (SEP) for the scheme integrating transmit antenna selection (TAS) with maximal-ratio combining (MRC) used in wireless networks. Applying this scheme, the transmitter always selects an optimal antenna out of all possible antennas based on channel state information (CSI) feedback. Over a flat-fading Rayleigh channel, we develop the closed-form SEP expressions for a set of commonly used constellations when assuming perfect and delayed CSI feedback, respectively. We also derive the Chernoff-bounds of the SEP´s for both perfect and delayed feedback. Our analyses show that while the antenna diversity improves the system performance, the feedback delay can significantly impact the SEP of TAS/MRC schemes.