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1. A method for estimating channel for communication signal in wireless communications involving mm Wave systems with non-ideal power amplifier and high mobility involving a pilot pattern comprising: transmitting a signal including a pilot signal element, information-bearing symbol and zero as guard; wherein, position of said pilot signal element is selectively confined within a grid defined involving communication channel's maximum delay and Doppler index to handle the high mobility scenario; said pilot pattern further includes multiplicative distortion and inter symbol interference (ISI) at receiver side due to nonlinearity, whereby selective placement of the guards facilitates removal of the ISI, while the multiplicative distortion depends on the pilot magnitude and power amplifier parameters which is known at the receiver, enabling the receiver to evaluate the amplitude and phase of the distorted pilot to carry out channel estimation.
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