Optimum Nyquist windowing in OFDM receivers

Conventional orthogonal frequency-division multiplexing receivers disregard the guard interval in channels with small dispersion even though its uncon sumed portion can be exploited for improved demodulation by applying a Nyqu ist-shaped window in the receiver, The transmitter does not need to be modi fied, subcarrier orthogonality in the receiver is preserved, and the receiv er discrete Fourier transform size can be retained. Windowing can mitigate the joint effect of additive noise and intercarrier interference among subc arriers caused by the carrier frequency offset. In this letter, a closed so lution for optimum window coefficients suited to this scenario is derived.