Demodulator apparatus for digital radio communication receiver p

Details Demodulator apparatus for digital radio communication receiver p Demodulator apparatus for digital radio communication receiver p

1996-09-13

1998-09-15

Marcelo, Melvin

Multiplex communications

Generalized orthogonal or special mathematical techniques

Quadrature carriers

370514, 375368, H04J 306, H04L 700

Patent

active

058090096

ABSTRACT:
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.

REFERENCES:
patent: 5222144 (1993-06-01), Whikehart
patent: 5463627 (1995-10-01), Matsuoka et al.
patent: 5555247 (1996-09-01), Matsuoka et al.
IEEE Transactions on Vehicular Technology, vol. 40, No. 2, May 1991 Giovanna D'Aria et al. "Fast Adaptive Equalizers for Narrow-Band TDMA Mobile Radio", pp. 392-404.

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