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The performance of transmit antenna selection is investigated. The exact closed-form expressions for the average BER and average SNR in MRT systems and EGT systems are proposed. The minimum number of increased transmit antennas sufficient to compensate the performance loss for using part of transmit antennas is analyzed. The validity of the performance analysis is demonstrated by computer simulation.
IEEE 802.11 PHY layer protocol supports multiple data transmission rates which is a tradeoff between channel capacity and bit error rate. Several MAC layer protocols have been proposed to accommodate this multi-rate feature. However, those protocols either just considered how to exploit channel condition of the direct link from the sender to the receiver, or just studied how to using a single relay...
A joint channel impulse response (CIR) and channel length estimation method based on the correlation between the pilot signal with the received signal with cyclic prefix (CP) information is proposed. The proposed method is more efficient for OFDM systems with CP. The noise reduction is processed by taking the time averaging of two CIRs which can be determined by using the channel length information...
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