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Signal evaluation and adjustment

A technology for channel estimation and receiving signals, which is applied in the field of estimating received signals, and can solve problems such as signal noise attenuation, enhanced noise, and increased noise energy

Active Publication Date: 2010-01-06
XUESHAN TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0010] When computing the inverse response, it is important to consider the source of the noise, which may result in an increase in noise energy in the received signal when computing the inverse response
This increase in noise energy is more annoying than an imperfect channel
(Because the inverse function filter is enhanced to counteract the attenuation of the channel and the energy of the noise is also enhanced, so the signal-to-noise ratio will be attenuated)

Method used

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  • Signal evaluation and adjustment
  • Signal evaluation and adjustment
  • Signal evaluation and adjustment

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Embodiment Construction

[0034] In order to fully understand the purpose, features and effects of the present invention, now through the following specific embodiments, and in conjunction with the accompanying drawings, the present invention is described in detail, as follows:

[0035]As mentioned before many wireless communication systems require information on the receiver noise energy (if the transmitted signal energy has been normalized to 1) and the signal-to-noise energy ratio. For adaptive coding and modulation schemes or energy control, noise energy estimates can be used to derive a channel quality indicator (CQI). For example, based on the standards of the 3rd Generation Partnership Project (3GPP), which is described in 3GPP TS25.214 V5.5.0 "Fifth Edition of Physical Layer Procedure (FDD)", published in Channel Quality of Node-B The relationship between the indicator (CQI) and the signal-to-noise ratio with a blocking error rate of 0.1 can be approximated by a linear function (refer to the pa...

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Abstract

A method of assessing a received signal acquired through a physical channel and comprising a pilot channel, the method comprising estimating from an oversampled version of the received signal an oversampled response for the physical channel and quantifying noise in the received signal using the oversampled received signal and the oversampled channel response.

Description

technical field [0001] The present invention relates to a method of estimating the received signal, especially the characteristics of the signal received through a physical channel and compensating for the effects of the non-ideal nature of the channel based on the collected information. Background technique [0002] Data is represented by a series of symbols in a code division multiple access (CDMA) system, such as the well-known quadrature phase shift keying (QPSK) or 16-bit quadrature amplitude modulation (16QAM) The way. For the transmission scheme, each symbol has its own position in the phase diagram, and in order to correctly decode the symbol, the receiver must correctly distinguish between the in-phase (real) part of the transmitted signal and the quadrature part that is 90 degrees out of phase. The phase part (imaginary part), in fact, the symbol code is multiplied by the spreading code (spreading code), for example, each symbol code is represented by a multiplici...

Claims

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Application Information

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IPC IPC(8): H04L25/02H04B1/707
CPCH04L25/0226H04B1/7115H04L2025/03426H04B1/707
Inventor 萌格·苏安·易
Owner XUESHAN TECH INC