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Device and method for the controlled scaling and quantization of soft output values of an equalizer

A soft output, equalizer technology, applied in the direction of DC level restoration device/bias distortion correction, transmission system, digital transmission system, etc., can solve the problems of quantization error, nonlinear distortion of input variable system, etc.

Inactive Publication Date: 2010-05-26
INTEL MOBILE COMM GMBH
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  • Abstract
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  • Claims
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Problems solved by technology

In the GSM service EGPRS, such soft output values ​​s k The numerical range of , which is otherwise wide for this business, is compressed linearly, however, this results in an increase in the quantization error
[0013] Non-linear compression can also be used instead of linear compression, the quantization error can thus be more advantageously redistributed, for example, the non-linear compression can be distributed with the quantization error for fewer soft output values However, the non-linear compression has the disadvantage that it causes the input variables into the channel decoder to suffer from non-linear distortions

Method used

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  • Device and method for the controlled scaling and quantization of soft output values of an equalizer
  • Device and method for the controlled scaling and quantization of soft output values of an equalizer
  • Device and method for the controlled scaling and quantization of soft output values of an equalizer

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Embodiment Construction

[0044] Figure 1 shows, in schematic form, an exemplary embodiment according to the present invention. In this example, a calculation unit 1, a scaling unit 2, and a quantization unit 3 are connected in the order described, one after the other, in an equalizer, and a control loop is via a calculation unit 4 and a downstream control unit 5 to connect the output of the quantization unit 3 to a control input of the scaling unit 2 .

[0045] The calculation unit 1 is used to calculate soft outputs each associated with an equalized data bit based on a hard decision and also indicating the probability of the data bit being a 0 or a 1 value s k . In an exemplary embodiment of the present invention, the soft output values ​​s generated by the computing unit 1 k has a data length of 16 bits, and the soft output values ​​s k is supplied to the proportional unit 2, where the soft output values ​​s k are separated by a scaling factor c, which reduces the range of values ​​of the soft ...

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Abstract

A device for scaling and quantization of digital soft output values (sk) from an equalizer has a control loop for controlling a statistical parameter (theta) for the scaled and quantized soft output values (sD,k), which contains a calculation unit ( 4 ) for calculation of the statistical parameter (theta), and a control unit ( 5 ) for calculation of a scaling factor (c) for scaling the soft output values (sk) from the equalizer on the basis of the statistical parameter (theta).

Description

technical field [0001] The present invention relates to an apparatus and method for performing control of the scaling and quantization of digital soft output values ​​from an equalizer. Background technique [0002] In a mobile wireless system, an electromagnetic wave is applied to the antenna of the mobile wireless system, the electromagnetic wave includes a radio frequency modulated by convolutional-encoded information and parity bits signal, and the antenna will convert the electromagnetic wave into an electrical signal, and the electrical signal is converted into a fundamental frequency by multiplication of a coherent carrier, and the radio frequency signal is passed through a band Two or more channels are filtered out by bandpass filtering, and are selected from time division multiplexing by time windowing. Furthermore, the radio frequency signal will be in the said During digitization during conversion, an equalizer is used to evaluate the transmitted channel-coded da...

Claims

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Application Information

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IPC IPC(8): H04L25/06
CPCH04L25/067
Inventor M·克雷格
Owner INTEL MOBILE COMM GMBH
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