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Method and apparatus for estimating a signal-to-interference ratio

A technology of signal-to-interference ratio and equipment, applied in transmission systems, electrical components, etc., can solve problems such as slow response to channel changes

Inactive Publication Date: 2014-02-26
INTERDIGITAL TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conventional estimators based on statistical variance require a larger number of pilot symbols for reasonable SIR estimation, which leads to a slow response to channel changes

Method used

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  • Method and apparatus for estimating a signal-to-interference ratio
  • Method and apparatus for estimating a signal-to-interference ratio
  • Method and apparatus for estimating a signal-to-interference ratio

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Experimental program
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Embodiment

[0043] 1. A method of estimating SIR.

[0044] 2. The method of embodiment 1, comprising receiving a signal comprising signal energy over a plurality of basis functions.

[0045] 3. The method of embodiment 2, comprising transforming the desired signal energy onto a first basis function having a stable polarity.

[0046] 4. The method of embodiment 3, comprising estimating expected signal energies by coherently averaging signal energies over said first basis function.

[0047] 5. The method according to any one of embodiments 3-4, comprising averaging and accumulating the signal energy from each basis function except the first basis function The noise power is estimated by averaging the signal energy of basis functions other than the first basis function and scaling the accumulated signal energy to take into account the noise estimate from the first basis function.

[0048] 6. The method of embodiment 5, comprising dividing the desired signal energy by the noise power to cal...

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PUM

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Abstract

A method and apparatus for estimating a signal-to-interference ratio (SIR) are disclosed. A received signal includes signal energy on multiple basis functions. Desired signal energy in the received signal is transformed onto a first basis function with constant polarity. The desired signal energy is estimated by coherently averaging signal energy on the first basis function. A noise power is estimated by averaging signal energy on each basis function other than the first basis function and accumulating the averaged signal energy from the basis function other than the first basis function and scaling the accumulated signal energy to account for a noise estimate from the first basis function. An SIR is estimated by dividing the desired signal energy by the noise power.

Description

technical field [0001] This application relates to digital communications including wireless communications. Background technique [0002] In Code Division Multiple Access (CDMA) wireless systems, precise power control is important to efficiently utilize frequency resources shared by wireless transmit / receive units (WTRUs) and base stations. When power is optimally controlled, system capacity increases because system capacity is highly related to the amount of interference in the system. [0003] In Wideband Code Division Multiple Access (WCDMA) systems, closed-loop power control is used for transmit power control. Closed-loop power control is based on signal-to-interference ratio (SIR) measurements. The measured SIR is compared to a reference SIR, and transmit power control commands are generated based on the SIR comparison. Therefore, the accuracy of SIR estimation greatly affects the stability and accuracy of transmit power control and system capacity. Conventional es...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/7097
CPCH04B2201/70701H04B1/707
Inventor K·K·凡加努鲁G·S·斯滕伯格W·E·劳顿
Owner INTERDIGITAL TECH CORP