Reliable multicarrier communication in the presence of timing phase error

a multi-carrier, timing phase error technology, applied in the field of communication systems, can solve problems such as inability to fully validate assumptions in many practical situations, inability to monitor information signals, and transmission data may be retrieved erroneously by receivers

Inactive Publication Date: 2008-12-25
AVAGO TECH WIRELESS IP SINGAPORE PTE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are various sources of interference and noise in a DMT system that may corrupt the information signal on each tone as it travels through the communication channel and is decoded at the receiver.
Because of this signal corruption, the transmitted data may be retrieved erroneously by the receiver.
However, this assumption may not be completely valid in many practical situations.
An important source of non-Gaussian impairment is, for example, phase noise.
Phase noise may be a sampling-time phase mismatch between the transmitter and the receiver devices.

Method used

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  • Reliable multicarrier communication in the presence of timing phase error
  • Reliable multicarrier communication in the presence of timing phase error
  • Reliable multicarrier communication in the presence of timing phase error

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Embodiment Construction

[0012]In the following detailed description of embodiments of the invention, reference is made to the accompanying drawings in which like references indicate similar elements, and in which, by way of illustration, specific embodiments in which the invention may be practiced are shown. These embodiments are described in sufficient detail to enable those skilled in the art to practice the invention, and it is to be understood that other embodiments may be utilized and that logical, mechanical, electrical, functional and other changes may be made without departing from the scope of the present invention. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the present invention is defined only by the appended claims.

[0013]In an Asymmetric Digital Subscriber Line (ADSL) system, where each tone is modulated using a Quadrature Amplitude Modulation (QAM) scheme, the error between the receive and transmit signal is usually depicted in a 2D ...

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Abstract

A method, system and apparatus for reliable multicarrier communication in the presence of timing phase error is disclosed. Phase noise due to a sampling-time phase mismatch between a transmitter device and a receiver device is measured in a signal. A Gaussian noise power level in the signal is determined, and a gain factor associated with the phase noise is calculated. The gain factor is applied to the Gaussian noise power level to calculate an equivalent noise power. In one aspect, the equivalent noise power is used to determine a signal-to-noise ratio. In another aspect, the signal is a multicarrier signal including a plurality of sub-carriers.

Description

REFERENCE TO RELATED APPLICATION[0001]This application is a continuation of Ser. No. 10 / 773,054 filed Feb. 4, 2004, which is hereby incorporated by reference.TECHNICAL FIELD[0002]This disclosure relates generally to communication systems, and more particularly to multicarrier communication in the presence of timing phase error.BACKGROUND[0003]A Discrete Multi-Tone (DMT) communication system carries information from a transmitter to a receiver over a number of tones. The tones are also commonly referred to as sub-carriers or sub-channels. There are various sources of interference and noise in a DMT system that may corrupt the information signal on each tone as it travels through the communication channel and is decoded at the receiver. Because of this signal corruption, the transmitted data may be retrieved erroneously by the receiver. In order to ensure a reliable communication between transmitter and receiver, each tone may carry a limited number of data bits. The number of data bi...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H04B17/00H04B1/38H04B3/46H04L5/16H04L27/26
CPCH04L27/2608H04L27/2657H04L27/2675H04L5/0044
Inventor SEDARAT, HOSSEIN
Owner AVAGO TECH WIRELESS IP SINGAPORE PTE
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