Automatic adaptive equalizer

Details Automatic adaptive equalizer Automatic adaptive equalizer

1989-11-09

1992-12-01

Chin, Stephen

Pulse or digital communications

Repeaters

Testing

375 39, 333 18, H03H 730

Patent

active

051685078

ABSTRACT:
A digital wireless subscriber telephone unit for wireless communication with a base station. An IF is used within the subscriber unit and base station which is combined with a carrier signal generated by a synthesizer for RF transmission between stations. In intervals between actuation of the system, a training mode is used wherein a known training signal is compared with a known values to produce correction coefficients to compensate for undesirable variations in timing and/or frequency, these constants being stored for use in correcting actual received signals. During demodulation, the modulated digital signals are fed to the modem processor in the form of time multiplexed I and Q samples and are demultiplexed. The demultiplexed I and Q samples are fed to an equalizer and frequency correction circuit for minimization of errors for production of a frequency correction signal based upon the correction coefficients which is used to correct any errors in the timing and frequency of the system.

REFERENCES:
patent: 4004226 (1977-01-01), Qureshi et al.
patent: 4430743 (1984-02-01), Watanabe
patent: 4599732 (1986-07-01), Le Fever
patent: 4621366 (1986-11-01), Cain et al.
patent: 4709374 (1987-11-01), Farrow

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