Four-Port Communication Receiver With Digital IQ-Regeneration

The five(six)-port communication receiver uses one or two additional outputs in comparison with classical homodyne demodulators. This paper demonstrates for the first time the demodulation of RF signals and the regeneration of IQ-signals by means of a four-port receiver. This system comprises a four-port linear junction and two quadratic detectors with a square-law characteristic. A digital signal processing block completes the circuit to regenerate the IQ-signals without any constraint on the system or the signal. In comparison with the five(six)-port technique, the four-port reduces the circuit size, the cost and the power consumption.