Link Correlation Based Transmit Sector Antenna Selection for Alamouti Coded OFDM
In MIMO systems, the deployment of a multiple antenna technique can enhance the system performance. However. since the cost of RF transmitters is much higher than that of antennas, there is growing interest in techniques that use a larger number of antennas than the number of RF transmitters. These methods rely on selecting the optimal transmitter antennas and connecting them to the respective. In this case, feedback information (FBI) is required to select the optimal transmitter antenna elements. Since FBI is control overhead. the rate of the feedback is limited. This motivates the study of limited feedback techniques where only partial or quantized information front the receiver is conveyed back to the transmitter. However, in MIMO/OFDM systems, it is difficult to develop an effective FBI quantization method for choosing the space-time, space-frequency, or space-time-frequency processing due to the numerous subchannels. Moreover. MIMO/OFDM systems require antenna separation of 5 similar to 10 wavelengths to keep the correlation coefficient below 0.7 to achieve a diversity Lain. In this case, the base station requires a large Space to Set Lip multiple antennas. To reduce these problems. in this paper, we propose the link correlation based transmit sector antenna selection for Alamouti coded OFDM Without FBI.
sector antenna antenna selection ofdm mimo fbi