Unlock instant, AI-driven research and patent intelligence for your innovation.

Detection and correction of phase jumps in a phase sequence

A sequence and phase technology, applied in the field of communication systems, can solve the problem of inaccurate frequency estimation

Inactive Publication Date: 2006-08-02
FUNAI ELECTRIC CO LTD
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] When the phase sequence (used to apply Tretter's algorithm) includes one or more phase jumps, the resulting frequency estimate is inaccurate

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Detection and correction of phase jumps in a phase sequence
  • Detection and correction of phase jumps in a phase sequence
  • Detection and correction of phase jumps in a phase sequence

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0023] exist figure 1 In the above, an example of the communication system according to the present invention is given. This communication system comprises interactive user terminals 1, which are transmitters within the meaning of the invention, and head-end stations 2, which are receivers within the meaning of the invention. The head-end station 2 transmits signals in the first frequency band Ku (12-14GHz). These signals are relayed by the satellite 3 to the interactive user terminal 1 . The interactive user terminal transmits signals in the second frequency band Ka (20-30 GHz). These signals are relayed by the satellite 3 to the head-end station 2 .

[0024] Each terminal 1 comprises a data source 10 and channel coding means 12 . The channel coding device delivers packets of N symbols, which contain preamble symbols and data symbols. These packets are then sent to filtering means 13 and finally to modulating means 14, which uses c local oscillator.

[0025] Head-end s...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to any receiver for MPSK (M=2) modulation, in which an error correction device is used for correcting Tretter type frequency errors and, upstream of this device, a phase estimation device based on decisions made on the received symbols. When the frequency error is such that, based on a certain symbol, an error is made in the decision, this error is translated by a phase jump of + / - pi / 2 in the sequence of phase estimations obtained. The frequency estimation obtained is then inaccurate. A receiver according to the invention comprises means for calculating a phase sequence, called initial sequence, based on decisions made on symbols, and means for detecting and correcting phase jumps in this initial sequence, so as to supply a phase sequence, called final sequence, to said frequency error estimation means. Applications: Interactive data transmission system - network head-ends.

Description

technical field [0001] The invention relates to a communication system comprising at least one transmitter and a receiver intended to receive symbols from PSK modulation, and comprising evaluation means for estimating the frequency error of the relevant symbols from a sequence of symbol phases. The invention also relates to a receiver intended to be used in such a communication system. [0002] The invention also relates to methods of estimating frequency errors associated with received symbols from PSK modulation from a sequence of symbol phases, and to methods of detecting and correcting phase jumps in the initial phase sequence of symbols from PSK modulation. [0003] The invention finally relates to a computer program comprising instructions for implementing such a method. Background technique [0004] Such an estimation algorithm based on the phase sequence and the frequency error of the received symbol, for example, in the paper "Feedforward Frequency Estimation for P...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/233H04L27/22H04L7/00H04L27/00
CPCH04L27/233H04L2027/0067
Inventor D·莱格兰德A·布拉亚尔A·乔利
Owner FUNAI ELECTRIC CO LTD