In this paper, we investigate the asymptotic performance of per-tone, bulk, and joint bulk/per-tone transmit antenna selections in orthogonal frequency-division multiplexing systems employing orthogonal space-time block coding (OSTBC). In particular, we show that the diversity and coding gains of all three systems are identical. This is a remarkable result since it demonstrates that systems with  M  transmit antennas operating in the high signal-to-noise ratio regime can achieve optimal performance while only employing enough radio frequency circuitry to convey OSTBC over  L   M  antennas on all subcarriers, thus offering significant savings over conventional approaches.
['Justin P. Coon', 'Magnus Sandell']
Performance of Transmit Antenna Selection in Space–Time-Coded OFDM Systems