Channel estimation for a wireless communication systems with chirp carriers

In this paper, a new communication system that inherently enables the estimation of channel parameters by employing the fractional Fourier transform is proposed. The system uses chirp bases as carriers and two of these carriers are also employed as pilot signals without decreasing the capacity of the system. We make use of two important properties of the fractional Fourier transform which are related to time and frequency shifts to determine the time-delay and doppler frequency parameters. Moreover data is transmitted in a circular time-frequency area rather than a rectangular one.