International Journal of Engineering and Technology

In a multiple input single output orthogonal frequency division multiplexing (MISO OFDM) system, per-subcarrier antenna selection is employed to improve the data rate over frequency selective fading channels. The antenna selection is based on the channel gain and the power balancing is achieved through allocating equal number of subcarriers to each antenna. This scheme of antenna selection suffers from the possibility of allocating antenna with weaker channel co-efficients and inefficient use of available transmit power. In this paper, an optimal power allocation scheme for each subcarrier to maximize the sum rate is proposed for MISO OFDM system using per-tone antenna selection with power balancing. The numerical results show that the proposed rate adaptation with optimal power allocation increases the data rate over rate adaptation with equal power allocation.