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Low cost architecture of direct conversion digital receiver

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4 Author(s)
J. -F. Gagne ; Dept. de Genie Electrique et Genie Informatique, Ecole Polytechnique de Montreal, Que., Canada ; J. Gauthier ; K. Wu ; R. G. Bosisio

The paper presents a low-cost architecture for a direct conversion digital receiver that uses six-port technology. An experimental prototype has been constructed and tested. Analogue carrier recovery and decision circuits are investigated as a means to provide future system integration and high data rate capacity. The designed receiver is operated at an ISM frequency of 2.45 GHz and uses a QPSK modulation format. Results on data rate limitations are given for QPSK signals up to 52 Mb/s. Test results related to adjacent channel, co-channel and CW interferences are presented for a data rate of 40 Mb/s. Phase offset between carrier and reference signals, along with carrier frequency deviation performances, are also presented for a rate of 40 Mb/s. A frequency hopping spread spectrum technique is discussed on the basis of the proposed architecture.

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IEE Proceedings - Microwaves, Antennas and Propagation  (Volume:151 ,  Issue: 1 )