Title:
CARRIER PHASE ESTIMATION DEVICE AND DEMODULATOR USING THE ESTIMATION DEVICE
Document Type and Number:
Japanese Patent JP3498600
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To obtain a suitable base band error ratio by a small circuit scale by controlling the band of a moving average value by using a part of plural symbols to be used for calculating the moving average value in order to obtain a carrier phase estimation value.
SOLUTION: A moving average means 25a calculates the moving average value of m symbols of in-phase and orthogonal modulation components outputted from a non-linear processing means 20. A filter band calculation means 5 inputs r symbols to be a part of plural symbols from respective m-stage shift registers 21a, 21b, analyzes these data, detects the power drop of received signal or sudden carrier phase variation due to phasing, shadowing, etc., and sets up a filter band based on the detected variation. The filter band value indicates how many data out of data stored in the m-stage shift registers 21a, 21b are to be used for the calculation of moving average and is applied to data output control means 22c, 22d each of which consists of a simple logical element.
More Like This:
Inventors:
Akinori Fujimura
Toshiharu Kojima
Toshiharu Kojima
Application Number:
JP31744198A
Publication Date:
February 16, 2004
Filing Date:
November 09, 1998
Export Citation:
Assignee:
Mitsubishi Electric Corporation
International Classes:
H04L27/227; H04L27/00; (IPC1-7): H04L27/227
Domestic Patent References:
| JP6276245A | ||||
| JP10224420A | ||||
| JP1041991A |
Attorney, Agent or Firm:
Kaneo Miyata (1 person outside)