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Decision-directed, automatic frequency control technique for non- coherently demodulated M-ARY frequency shift keying
Decision-directed, automatic frequency control technique for non- coherently demodulated M-ARY frequency shift keying
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机译:用于非相干解调的M-ARY频移键控的决策导向自动频率控制技术
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摘要
A data receiver apparatus for recovering digital data signals from an M-ARY FSK modulated signal incorporates a dedicated linear discriminator, downstream of the data recovery process, in the carrier tracking loop. Because the signal modulation components are removed prior to tracking, only frequency error remains, which is employed by the linear discriminator for steering a VCO in the frequency tracking loop. This results in a closed loop step response that rapidly converges to a stable level, and a linear frequency estimation characteristic.
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