An RF-ID receiver using SAW filters for wideband synchronisation

This paper proposes an architecture for an RFID receiver which allows a number of RFID tags with oscillators of low frequency stability to be accommodated within the same RFID cell. The RFID tags can transmit at carrier frequencies anywhere within a wide band of 30 MHz centred on 5.8 GHz. The synchronisation technique uses a carrier frequency estimator which is implemented using SAW dispersive delay filters. The carrier frequency estimator uses the spectral properties of the received signal to estimate the carrier frequency. The performance of the synchronisation technique on a BPSK modulated carrier signal has been examined for two peak search algorithms.