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Demodulator apparatus for digital radio communication receiver providing pseudo-coherent quadrature demodulation based on periodic estimation of frequency offset
Demodulator apparatus for digital radio communication receiver providing pseudo-coherent quadrature demodulation based on periodic estimation of frequency offset
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机译：用于基于频率偏移的周期性估计提供伪相干正交解调的数字无线电通信接收机的解调器设备
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摘要
A demoodulator apparatus for a TDM radio receiver successively compares a sampled quadrature baseband signal with a known pilot symbol sequence to detect timings of correlation with a periodically received pilot symbol sequence, with a resultant correlation signal being used in generating a frame synchronizing signal as a basic timing reference signal, and with a degree of dispersion of the correlation signal being detected and used to modify generation of the frame synchronizing signal such as to minimize the effects of adverse radio signal reception conditions on that signal. In addition, demodulation of a quadrature phase-modulated carrier to obtain a quadrature baseband signal is executed by a pseudo-coherent process based on periodic estimation of a frequency offset, with a degree of compensation applied for the offset being accordingly periodically updated, making use of an automatic frequency control loop unnecessary.
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