RECEIVER WITH FREQUENCY OFFSET CORRECTING FUNCTION

Title:

RECEIVER WITH FREQUENCY OFFSET CORRECTING FUNCTION

Document Type and Number:

WIPO Patent Application WO/1998/039854

Kind Code:

A1

Abstract:

A receiver with frequency offset correcting function corrects distortion caused by interference between codes and a frequency offset in received signals. In order to correct the distorsion, a frequency offset correcting circuit (21) corrects the received signals based on an estimated frequency offset value. A first CIR estimating circuit (22) finds an estimated CIR value at a first position based on an already known training sequence in the corrected received signals. A second estimating circuit (24) finds another estimated CIR value at a second position which is different from the first position by updating the estimated CIR value at the first position as an initial value in accordance with an LMS algorithm based on the corrected received signals and a decision value outputted from an equalizer (13). A phase deviation detecting circuit (15) calculates phase deviations based on the estimated CIR values at the first and second positions and an averaging circuit (26) averages the phase deviations and outputs the average phase deviation to a frequency offset correcting circuit (21) as an estimated frequency offset value.

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Inventors:

NAGAYASU TAKAYUKI (JP)
MURAKAMI KEISHI (JP)

Application Number:

PCT/JP1997/000653

Publication Date:

September 11, 1998

Filing Date:

March 04, 1997

Export Citation:

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Assignee:

MITSUBISHI ELECTRIC CORP (JP)
NAGAYASU TAKAYUKI (JP)
MURAKAMI KEISHI (JP)

International Classes:

H04B7/01; H04L25/02; H04L27/00; H03J7/02; H04L25/03; (IPC1-7): H04B3/10

Foreign References:

JPH06508244A	1994-09-14
JPH08223096A	1996-08-30
JP4502692A

Other References: