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Method and system for regulating maximum probability detection

A possibility and maximum technology, applied in the field of dynamically changing the branch metric weight of the maximum possibility detector, which can solve the problems of decoding influence and insoluble detection results.

Inactive Publication Date: 2006-01-25
LITE ON IT
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  • Description
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Problems solved by technology

[0006] It can be seen from the above that in the prior art, the abnormal signal may have a serious impact on the decoding of the detector, causing unresolvable errors in the detection results

Method used

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  • Method and system for regulating maximum probability detection
  • Method and system for regulating maximum probability detection
  • Method and system for regulating maximum probability detection

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Embodiment Construction

[0027] From the foregoing, one of the features of the present invention is to use detected anomalies to adjust maximum likelihood detection before decoding a received signal. Therefore, when the receiver receives a certain signal pattern (Pattern), it can determine whether the signal is an abnormal signal or an error is generated due to excessive noise.

[0028] If we encode the original digital data signal in RLL(2,10) (Run Length Limited) format, when this signal passes through a part of the response channel PR(1,2,1), the ideal signal level is (4,2, -2, -4) four, while receiving signals will not have (2, -2, 2), (-2, 2, -2), (-2, 4, -2), or (2, -4 , 2) This type of (+, -, +) or (-, +, -) signal pattern, and the situation that the level difference of two consecutive received signals exceeds 6 occurs. Therefore, if the signal received by the receiving end has the above situation, it can be determined that the signal is abnormal.

[0029] figure 2 Schematic diagram of maki...

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Abstract

A method for adjusting maximum contingency detection utilizes detected - out abnormal signal mode to adjust branch metric weighting of maximum contingency detector for achieving purpose of decreasing influence of hybrid or abnormal signal to maximum contingency detector to increase accuracy of said detector . The system for realizing the method is also disclosed.

Description

technical field [0001] The present invention is a method and system for adjusting the maximum possibility detection, especially dynamically changing the branch measurement weight of the maximum possibility detector to increase the accuracy of detection. Background technique [0002] Maximum Likelihood Detection (Maximum Likelihood Detection) is a common detection method, which is widely used in various fields such as communication, video and audio, and data storage. Generally speaking, maximum likelihood detection can be divided into two types: hard-decision and soft-decision. The hard decision is to forcibly divide the received signal into legal levels according to the quantization level of the original signal, while the soft decision is to reserve the level of the received signal for maximum possibility detection. Soft decision has better performance, but the circuit complexity is higher. However, with the evolution of technology, soft decision is mostly used at present. ...

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Application Information

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IPC IPC(8): H03M13/41G11B20/00
Inventor 张佳彦
Owner LITE ON IT
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