Method and apparatus for digitally evaluating the phase of a mod

Details Method and apparatus for digitally evaluating the phase of a mod Method and apparatus for digitally evaluating the phase of a mod

1995-09-22

1998-04-14

Vo, Don N.

Pulse or digital communications

Receivers

Angle modulation

375332, 329304, H04L 2714, H04L 2716, H04L 2722

Patent

active

057402027

ABSTRACT:
The method makes it possible digitally to evaluate the phase of any carrier that has been subjected to rPSK modulation subsequent to clock recovery, sampling, and digitizing the in-phase and quadrature components of the samples, by processing that is performed in polar coordinates and that comprises reducing the range over which the phase of each sample is defined to a range of +.pi./r to -.pi./r and then seeking the center of gravity over 2.sup.N successive samples (N being an integer) by performing successive averaging calculations, each time on two values, in application of an N-stage tree structure. Each average of two values is associated with an index indicative of the degree of reliability of the average, and those averages which are associated with a small reliability index are ignored while calculating subsequent averages in the tree structure.

REFERENCES:
patent: 5260974 (1993-11-01), Johnson et al.
patent: 5297172 (1994-03-01), Shenoy et al.
patent: 5440265 (1995-08-01), Cochran et al.
patent: 5638406 (1997-06-01), Sogabe
Electronics And Communications In Japan, vol. 67-B, No. 5, Jan. '84, New York, U.S. Namiki "Block demodulation for short radio packet" Figs. 5, 6.
1988 IEEE International Symposium On Circuits And Systems, Jun. 7, '88-Jun. 9, '88, Espoo, FI, pp. 1815-1818, Eglin et al. "Digital implementation of a coherent CPM system for mobile radio", Figs. 2, 3.

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