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Method and apparatus for determining signal-to-interference ratio with reduced bias effect

A signal-to-interference ratio and data signal technology, applied in the field of finding the signal-to-interference ratio, can solve the problems of overestimation of SIR estimation, overestimation of estimation, incomplete separation of signal and interference, etc.

Inactive Publication Date: 2005-12-21
INTERDIGITAL TECH CORP
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Problems solved by technology

First, a signal and its interference cannot be completely separated
Second, the required signal is data-modulated (data-modulated), so the SIR measurement is done using a blind method, that is, there is no previous data for the data signal
This decision error is the main source of error leading to an estimate of the average signal power, and thus an overestimation of the SIR estimate
In the lower SIR range (high raw BER range), this average signal power (or SIR) estimate may be overestimated

Method used

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  • Method and apparatus for determining signal-to-interference ratio with reduced bias effect
  • Method and apparatus for determining signal-to-interference ratio with reduced bias effect
  • Method and apparatus for determining signal-to-interference ratio with reduced bias effect

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Embodiment Construction

[0043] The preferred embodiment of the present application is described below, providing a novel SIR estimation process based on a data demodulator output. The present application also provides a SIR estimation device. By definition, a data demodulator output term means the output provided at the final stage of the considered data demodulator. The data demodulator processes the received baseband signal and provides soft-valued estimates of the transmitted symbols. The estimated symbols are further processed by other receiver functions, such as a channel decoder, in order to decode the transmitted data information to the receiving device.

[0044] In the description of the 3GPP system, the demodulator can be configured as a multiuser detection (MUD) receiver or single user detection (SUD) receiver, such as a matched filter, Rake receiver and equalizer (equalizer). Even though the binary phase shift key (BPSK) and quadrature phase shift key (QPSK) demodulation methods appear ...

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Abstract

A method and apparatus for performing Signal-to-Interference Ratio (SIR) estimation in a wireless communication system using a demodulator output, such as a Rake output or a Multi-User Detection (MUD) receiver output . The demodulator output is provided to a SIR estimator to perform the SIR estimation based on estimated average signal power and estimated effective interference power. The estimated average signal power is based on a minimum function for determining a minimum value between a median-based average power value and a mean-based average power value. The SIR estimator reduces the bias effect in SIR estimation, and can be used in BPSK and QPSK modulation modes and higher order modulation modes such as 8-PSK and 16-QAM. A correction function term is used as the mean and median to further reduce the bias effect.

Description

technical field [0001] The present invention relates to a method and device for finding signal-to-interference ratio (SIR) in a digital communication system. Especially SIR estimation with reduced bias contribution. Background technique [0002] SIR measurement is an important metric for the quality performance of digital communication systems. For wireless communication systems such as third generation (3G) wireless systems, SIR measurement is used in many link adaptation techniques (LinkAdaptation Techniques) such as transmit power control and adaptive modulation and coding. Typically, the SIR measurement at the receiving device is more meaningful than that at the transmitting device, because the SIR measurement at the receiving device directly reflects the quality of the communication link signal, especially in the presence of multiple access interference or multipath fading channels. [0003] By definition, a received signal contains a desired signal and interference. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00H04BH04B1/10H04B1/707H04B1/7097H04B7/005H04B7/26H04B15/00H04B17/00H04L29/02
CPCH04B1/1027H04B17/336Y02D30/70H04L5/0062H04B15/00H04L5/0058
Inventor S·H·辛A·莱尔
Owner INTERDIGITAL TECH CORP
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