Self-calibrating highly integrated radio frequency front-end for parallel π/4 DQPSK decoding

Abstract

This work describes a high-frequency front-end that is able to decode up to four π/4 DQPSK modulated 25 kHz carriers simultaneously in a 5 MHz downlink band located between 70 MHz and 6 GHz. The front-end is self-calibrating its time-variant phase- and timing-offsets by maximum likelihood estimators. The calibrating algorithm does not depend on a particular… (More)

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