SAW chirp Fourier transform for multicarrier transmission

The principle of multicarrier transmission (MCT) for line-of-sight radio systems by means of SAW chirp Fourier transforms (CFT) is presented in this paper. A simplified structure for the CFT is recommended in both transmitter and receiver. In this structure the convolving chirp in the CFT should have a quadratic phase versus frequency response. This requirement results in a chirp impulse response with infinite length. The square root cosine window is used as a weighting function; for the amplitude of frequency response of the chirp. A realizable chirp impulse response can be seen as a version of the ideal chirp response smoothed in both phase and amplitude and subject to fabrication errors. The system degradation caused by the imperfect chirp line is found by means of system simulation