Differential detecting apparatus for detecting phase difference

Details Differential detecting apparatus for detecting phase difference Differential detecting apparatus for detecting phase difference

1996-10-21

1998-10-27

Ghebretinsae, Temesghen

Pulse or digital communications

Receivers

Angle modulation

375324, 329304, H03D 322, H04L 2722

Patent

active

058287078

ABSTRACT:
A differential detecting apparatus includes samplers 1 and 2, differential detection calculating unit 3, and two post-detection filters 4 and 5. Differential detection calculating unit 3 performs a differential detection with time-division multiplexing on data output from these samplers and alternately outputs a data sequence of a part of cosine component of the phase difference of the modulated signal and a data sequence of the rest of the cosine component. Differential detection calculating unit 3 also alternately outputs a data sequence of a part of sine component of the phase difference and a data sequence of the rest of the sine component. Each of post-detection filters 4 and 5 includes linear interpolating filter 35 and integral filter 36 which are connected in series. The linear interpolating filter 35 obtains a moving average from successive three pieces of input data weighted by 1:2:1 and the integral filter 36 obtains an integral value from successive k pieces of input data.

REFERENCES:
patent: 4849706 (1989-07-01), Davis et al.
patent: 5007068 (1991-04-01), Simon et al.
patent: 5017883 (1991-05-01), Divsalar et al.
patent: 5379323 (1995-01-01), Nakaya

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