Title:
【発明の名称】コヒーレント無線受信機の周波数制御方法及びその方法を実施する装置
Document Type and Number:
Japanese Patent JP2634319
Kind Code:
B2
Abstract:
The invention relates to a method and an arrangement for controlling the frequency of a radio-receiver which receives signal-sequencies which have been subjected to interference and which include a synchronizing-sequence and a data-sequence. A signal-sequence is A/D-converted (3) to signal-points (I,Q) intended for analysis, and a Viterbi-algorithm (10) is adapted (12,13) to the prevailing interferencies with the aid of the synchronizing-sequence. The data-sequence is Viterbi-analyzed through a large number of calculating stages, for the purpose of determining the bit-sequence of the data-sequence. According to the invention, a bit-sequence is extracted during the Viterbi-analysis, with a time-delay (TE), subsequent to effecting a few calculating stages, and a corresponding extracted signal-point is calculated (14). The analysis-intended signal-point corresponding to the extracted signal-point is divided and time-delayed (16,TE), and phase-compared (15) with the extracted signal-point. Corresponding phase-comparisons are made with respect to consecutive signal-points in the data-sequence and the angular magnitudes obtained in the phase-comparison are low-pass filtered and integrated (17) to form an angle-shift signal (V). The analysis-intended signal-points are displaced angularly (11) by the angle-shift signal (V) prior to the Viterbi-analysis.
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Inventors:
REISU ARETSUKUSU KURISUTERU
Application Number:
JP50273490A
Publication Date:
July 23, 1997
Filing Date:
January 04, 1990
Export Citation:
Assignee:
TEREFUON AB ERU EMU ERIKUSON
International Classes:
H04L7/00; H04L25/03; H04L27/16; H04L27/14; H04L27/233; H04L27/18; (IPC1-7): H04L27/16; H04L27/14; H04L7/00; H04B7/26
Attorney, Agent or Firm:
Akira Asamura (3 outside)