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oaioai:casi.ntrs.nasa.gov:19920014932

Frequency-offset insensitive digital modem techniques

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Publication date
1990
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Abstract

Conventional DPSK systems are adversely affected by transmitter/receiver frequency offsets due to frequency reference errors and Doppler shifts. Two DPSK modem concepts are presented which avoid the long frequency acquisition process of conventional DPSK. One technique involves a modified demodulator for conventional DPSK signals, while the other involves making minor changes to both the modulator and demodulator. Simulation results are provided showing performance relative to conventional DPSK

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This paper was published in NASA Technical Reports Server.

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