Apparatus for communications

Details Apparatus for communications Apparatus for communications

2006-02-03

2009-08-18

Ha, Dac V (Department: 2611)

Pulse or digital communications

Receivers

Automatic frequency control

C375S261000, C375S327000, C375S354000, C455S182200, C455S192200, C455S214000

Reexamination Certificate

active

07577219

ABSTRACT:
An apparatus for communications includes, a front processor for outputting a digital formatted base band signal with quadrature demodulating a modulated signal; an interpolation processor for interpolating to adjust a phase error in accordance with sampling timing on the basis of the base band signal outputted from the front processor and for creating and outputting a base band signal synchronized with the sampling timing; and a back processor for wave-shaping the base band signal outputted from the interpolation processor and for outputting. And the apparatus changes tap coefficients which are supplied to an FIR filter in the interpolation processor on the basis of the modulated signal inputted therein, and can appropriately control the bandwidth characteristic of interpolators.

REFERENCES:
patent: 5309484 (1994-05-01), McLane et al.
patent: 5872818 (1999-02-01), Choi
patent: 6034564 (2000-03-01), Iwamatsu
patent: 6208481 (2001-03-01), Spurbeck et al.
patent: 7054088 (2006-05-01), Yamazaki et al.
patent: 7098821 (2006-08-01), Husted et al.
patent: 7333579 (2008-02-01), Hwang
patent: 0 748 118 (1996-12-01), None
McLane, P.J., Filter Coefficient Interpolated Timing Recovery in Sampled Coherent PSK Receivers, IEEE, Dec. 6, 1992, pp. 472-478, vol. 1, New York, USA.

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