Abstract
We present a wireless spread spectrum system based on SAW chirped delay lines on LiTaO/sub 3/-X112rotY operating in the ISM band at 2.45 GHz. The center frequency, transmission bandwidth, chirp rate, and data rate are 348.8 MHz, 80 MHz, /spl plusmn/40 MHz//spl mu/s, and 2 Mbits/s, respectively. Due to the reduction of the sidelobes of the compressed pulse to -42 dB, a high processing gain of 22 dB, and the large transmission bandwidth our system is robust against narrowband fading and noise. This paper describes the design, technology and measurement results of the used SAW chirped delay lines. The proposed communication system and simulation results are presented, measurements obtained with a hardware demonstrator are given, and the limiting factors of the data rate of our system are shown.
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