Arrangement for equalizing and demodulating binary continuous-ph

Details Arrangement for equalizing and demodulating binary continuous-ph Arrangement for equalizing and demodulating binary continuous-ph

1989-07-07

1991-05-07

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375 86, 333 18, H04L 512

Patent

active

050142836

ABSTRACT:
A preprocessing unit is inserted between a baseband converter and an equalizer/detector for performing a signal processing which corresponds to a phase rotation of the CPM-signal in the baseband represented by in phase and quadrature components. The phase rotation progresses in discrete steps of 90.degree. per bit interval of the binary data signal contained in the CPM-signal. The introduction of the preprocessing unit renders it possible to use a comparatively simple conventional equalizer/detector for binary pulse amplitude modulated signals (PAM-signals) for equalizing and detecting binary CPM-signals received in distorted form. When the equalizer/detector is adaptive, a further preprocessing unit is inserted between a channel estimator and adjusting inputs of the equalizer/detector.

REFERENCES:
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patent: 4716577 (1987-12-01), Oexmann
patent: 4794624 (1988-12-01), Braun et al.
R. Sadr et al., "Generalized Minimum Shift-Keying Modulation Techniques", IEEE Transactions on Communications, vol. 36, No. 1, Jan. 1988, pp. 32-40.
C. E. Sundberg, "A Class of Jointly Power and Bandwidth Efficient Digital Modulation Schemes with Constant Amplitude", IEEE Communications Magazine, vol. 24, No. 4, pp. 25-38, Apr. 1986.
N. A. B. Svensson, "On Optimum and Suboptimum Coherent Detection of Continuous Phase Modulation on a Two-Ray Multipath Fading Channel", IEEE Transactions on Communications, vol. COM-35, No. 10, pp. 1041-1049, Oct. 1987.

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