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A direct down-conversion receiver for coherent extraction of digital baseband signals using the injection locked oscillators

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2 Author(s)
Munir A. Tarar ; Microwave and Wireless Research Laboratory, Department of Electrical and Computer Engineering, Dalhousie University, Halifax, NS B3J 1Z1 Canada ; Zhizhang Chen

In today's digital wireless communications direct down-conversion receiver is becoming a favorite choice due to its overall simplicity and low cost. However, carrier recovery of the received digitally modulated RF signal for clear IQ signal extraction at high symbol rates is not so simple. Until now, phase-locked loop (PLL) and/or direct-digital synthesizers (DDS) or combination of both have been used for better performance but at the expense of high complexity or cost. In this paper for the first time we propose a direct down- conversion receiver that uses an injection-locked oscillator (ILO) for carrier recovery and frequency synthesizing. The results are shown for carrier recovery of a 2.1 GHz 20 Msps 8 PSK signal and coherent demodulation of a 2.78 GHz 160 Msps QPSK signal. The receiver presented is of low-cost and low-complexity and applicable to any kind of digitally modulated signals reception. It can be used in many wireless applications as WiMax, RFID and sensor networks.

Published in:

2008 IEEE Radio and Wireless Symposium

Date of Conference:

22-24 Jan. 2008