A Study on Diversity Reception of OFDM Signal
Details
In this paper, we discuss about diversity reception of an OFDM signal using pilot symbol assisted channel estimation. We usually use an adaptive equalizer in an OFDM demodulator to improve the effect of multipath interference and the frequency selective fading. In an OFDM demodulator, the equalization technique in which the received symbol is divided by the channel transfer function, has been discussed. However, when the absolute value of the channel transfer function is very small because of the frequency selective fading, the performance will degrade by an additive noise. So, we propose diversity reception of an OFDM signal using pilot symbol assisted channel estimation, which is effective to improve the bit error rate characteristic under multipath environments. As the results of computer simulations and theoretical analyses, it is confirmed that the bit error rate characteristic is better than the single antenna receiver.
