the receiver design considerably. The task of channel estimation is simplified, as we just need to estimate the scalar coefficients for each sub-channel and once the values of are estimated, for the duration in which the channel does not vary significantly, merely multiplying the received demodulated symbols by the inverse of yields the estimates of and hence, the estimate of actual symbols . See also Guard interval Interpacket gap Intersymbol interference References Fundamentals of Wireless Communication, by David Tse and Pramod Viswanath, Cambridge University Press (2005). External links A short tutorial on the significance of cyclic prefix in OFDM systems. Quantized radio modulation modes