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Method for estimating residual noise in signal and apparatus utilizing this method

A technology of residual noise and equipment, a device applied to residual noise in the frequency range, to estimate the residual noise in the frequency range of the required part of the signal, in the field of mobile phones, it can solve problems such as reducing throughput and increasing delay, reaching The effect of low implementation cost, continuous link quality, fast response to changes in transmission conditions

Inactive Publication Date: 2005-03-16
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For packet-oriented data transmission, the bit error rate can be kept low by retransmitting, but it will increase the delay and reduce the throughput

Method used

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  • Method for estimating residual noise in signal and apparatus utilizing this method
  • Method for estimating residual noise in signal and apparatus utilizing this method
  • Method for estimating residual noise in signal and apparatus utilizing this method

Examples

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Embodiment Construction

[0044] figure 1 Shown is the front end of the mobile phone receiver of the cellular digital radio communication system in the present invention.

[0045] exist figure 1 Among them, 101 represents the receiver antenna (optionally used together with the transmitter part through a duplexer), and 110 represents the received radio frequency signal. The received signal 101 is sent to an RX band filter 102 which filters the signal in the relevant received frequency band to pass a signal 111 comprising the frequency band to be allocated to the cellular system, for example the GSM band around 900 MHz or IMT-2000 frequency band around 1950MHz. The signal 111 is passed to an analog demodulator 103 which mixes the relevant part of the frequency band to baseband using the channel frequency 109 given by the system for downconversion. The output signal 112 from the analog demodulator 103 is fed to an analog filter 104 which is used to filter out frequencies surrounding the channel of inte...

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Abstract

The invention relates to: a method for estimating residual noise in the frequency range (271) of a desired part (240) of a signal to a corresponding apparatus and to a mobile telephone utilizing the method. The object of the present invention is to generate a measure for the residual noise in a signal. The problem is solved in that the amplitude of the signal (114) comprising the noise is modified, and the signal (114) is combined with the modified signal (115) to create a noise estimation measure (116). The invention may e.g. be used in digital radio communications systems to contribute to the monitoring of link quality and therefore to improve payload throughput. One of the advantages of the invention is that an indication of link quality at an early stage in the receiver is provided.

Description

technical field [0001] The present invention relates to the estimation of residual noise in a signal. The invention can be used, for example, for link quality estimation in digital radio communication systems. [0002] In particular, the invention relates to a method of estimating residual noise in the frequency range of a desired portion of a signal. [0003] The invention also relates to a device for estimating residual noise in the frequency range of a desired part of a signal. [0004] The invention further relates to a mobile phone employing such a method. Background technique [0005] The following description of the prior art relates to one field of application of the invention: cellular digital radio communication systems. [0006] Such technologies are being developed to evolve cellular systems from primarily voice telephony to systems capable of handling large amounts of data simultaneously. One of the requirements of next-generation cellular systems is to be a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/26H04B17/00H04L1/00H04L1/20
CPCH04L1/0009H04L1/0002H04L1/20
Inventor A·库拉B·林多夫N·斯藤斯特伦
Owner TELEFON AB LM ERICSSON (PUBL)
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