Data communication modulation with managed intersymbol interfere

Details Data communication modulation with managed intersymbol interfere Data communication modulation with managed intersymbol interfere

1993-11-03

1995-01-31

Mis, David

Modulators

Frequency shift keying modulator or minimum shift keying...

332103, 329300, 329304, 375 45, 375 46, 375 51, 375 52, 375 57, 375 60, 375 62, 375 67, H03C 300, H03D 300, H04L 2710, H04L 100

Patent

active

053862023

ABSTRACT:
A communication system (10) includes a modulation section (12) and a demodulation section (14). The modulation section (12) performs frequency modulation in accordance with a frequency trajectory signal (28, 30, 32). An intersymbol interference (ISI) prediction filter (20) adjusts the amplitude of the frequency trajectory signal (28, 30, 32) in response to data code (16) sequences being conveyed over a plurality of symbols (18). More frequent data changes in the sequence of the data codes (16) lead to greater amplitudes in the frequency trajectory signal. The demodulation section (14) applies a distorted phase signal to a decision circuit (38). The distorted phase signal conveys a received phase (46) that includes ISI. Due to the equalization applied by the ISI prediction filter (20), the received phase (46) approximates a target phase (40, 42) in spite of the ISI.

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Thesken, Teresa Marie, "Trellis-Coded Continuous-Phase Modulation with Differential Detection and Procoding" U. of California, Los Angeles, Dissertation 1989.
I. Korn, "GMSK with Differential Phase Detection in the Satellite Mobile Channel", IEEE Transactions on Communications, vol. 38, No. 11, Nov. 1990, pp. 1980-1986.
Harashima, Hiroshi and Miyakawa, Hiroshi, "Matched-Transmission Technique for Channels with Intersymbol Interference", IEEE Transactions on Communications, vol. COM-20, No. 4, Aug. 1972, pp. 774-780.
Murota, Kazuaki, "GMSK Modulation for Digital Mobile Radio Telephony", IEEE Transactions on Communications, vol. COM-29, No. 7, Jul. 1991, pp. 1044-1050.
Forney, G. David, Jr. and Eyuboglu, M. Vedat, "Combined Equalization and Coding Using Precoding", IEEE Communications Magazine, Dec. 1991, pp. 25-34.

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