Title:
決定指向周波数オフセット推定
Document Type and Number:
Japanese Patent JP2004505507
Kind Code:
A
Abstract:
A method of estimating the frequency at the receiving end for a packet transmission system, for estimating a carrier frequency error between received symbols (rk) and transmitted symbols (ck). An error function (H(DELTA f)) defined for minimizing a magnitude which is representative of an average distance between the received symbols compensated in phase (r'k) and estimations of the received symbols affected by a frequency error estimation (ĉkej2pikDELTA(Ø) is computed. The estimations of the received symbols affected by the frequency error estimation are obtained by varying the frequency error (DELTA f) in an acquisition interval ([-fmax, +fmax]) for estimations of the transmitted symbol (ĉk). The estimations of the transmitted, symbols (ĉk) are obtained based on a threshold relating to the phase of the received symbol which is compensated in phase (r'k), in the case of a modulation of the PSK type. For a modulation of the QPSK (Quadrature PSK), the threshold decision is based on the sign of the real and imaginary parts of the received, phase-compensated symbol (r'k).
Inventors:
Legrand, Delphine
Shree, Antoine
Brahal, Americo
Shree, Antoine
Brahal, Americo
Application Number:
JP2002514976A
Publication Date:
February 19, 2004
Filing Date:
July 09, 2001
Export Citation:
Assignee:
Koninklijke Philips Electronics N.V.
International Classes:
H04B1/16; H04L27/227; H04L27/22; H04L27/00; (IPC1-7): H04L27/227; H04B1/16
Attorney, Agent or Firm:
Tadahiko Ito
Shinsuke Onuki
Tadashige Ito
Masafumi Nakamura
Shinsuke Onuki
Tadashige Ito
Masafumi Nakamura