A Chirp Communication System Using SAW-Chirp Devices for Multibit Symbol Transmission

Linear up-chirp signal and the corresponding down-chirp signal covers the same bandwidth and use of both the chirps simultaneously requires no additional bandwidth. Using the property of frequency variation of the chirp signal, in this paper, a data modulation technique is proposed to increase the data rate and the design a chirp communication system is presented to transmit 3-bit symbol using chirp signals. The modulation and demodulation of chirp signals are performed using surface acoustic wave (SAW) devices which greatly simplify the system complexity. Design of SAW-chirp devices to perform the proposed modulation and demodulation processes is also presented. Symbol error rate (SER) performance of the proposed system is analyzed in additive white Gaussian noise (AWGN) and Rayleigh fading channels, and its benefit over the available SAW-chirp communication systems is also outlined.