Pulse or digital communications – Receivers – Angle modulation
Patent
1994-11-17
1996-10-15
Tse, Young T.
Pulse or digital communications
Receivers
Angle modulation
375233, 375235, 329304, H04L 702, H03H 730
Patent
active
055662102
ABSTRACT:
A data receiving apparatus includes: a receiving portion for receiving a QPSK (PSK, GMSK) signal using a local oscillation signal; a forward (FWD) equalizing portion for effecting a FWD equalization to the PSK signal using FWD tap coefficients, including a FWD main tap coefficient, successively renewed; a backward equalizing portion for effecting a backward equalization to the PSK signal using backward tap coefficients, including a backward main tap coefficient, successively renewed; and a prediction portion for predicting a phase difference between a carrier frequency of the PSK signal and the local oscillation frequency according to the FWD and backward main tap coefficients. In this apparatus, the FWD and backward equalizing portions effect FWD and backward equalizing training processings using the sync word in the PSK signal in the FWD and backward directions to determine the FWD and backward tap coefficients before FWD and backward equalizations respectively. It may further include a correction portion for compensating a phase difference in outputs of the FWD and backward equalizing portions according to the predicted phase difference. The local oscillation frequency is controlled according to the predicted phase difference.
REFERENCES:
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IEEE Journal of Selected Areas in Communication, vol. 11, No. 7, Sep. 1993, New York, US, pp. 1034-1045 Yow-Jong Liu et al. "A soft-output bidirectional decision feedback equalization technique for TDMA cellular radio".
Saito Yoshiko
Uesugi Mitsuru
Matsushita Electric - Industrial Co., Ltd.
Tse Young T.
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