Threshold adjust system and method
First Claim
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1. A threshold adjustment method employed by a communications apparatus, the method comprising:
- receiving an analog signal;
adjusting a threshold of the received analog signal in accordance with a threshold adjust signal to generate a threshold adjusted signal;
sampling the threshold adjusted signal to generate a sampled signal;
generating a histogram from the sampled signal;
processing the histogram to generate an error signal,wherein processing includes calculating a difference between y-intersects of at least two substantially straight curves defined by log values from the histogram, wherein the y-axis represents the distribution of the received signal; and
generating the threshold adjust signal in accordance with the error signal.
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Abstract
An adaptive algorithm is implemented that optimizes the slicer threshold by optimizing the tail distribution of a “+1” and “−1” histogram. Through the use of a low resolution and under-sampled ADC, a histogram of received bit may be created. The difference between the y-intersects of lines derived from the “+1” and “−1” histogram is used to determine an error function. The algorithm iteratively updates the threshold value based on this error function.
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Citations
25 Claims
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1. A threshold adjustment method employed by a communications apparatus, the method comprising:
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receiving an analog signal; adjusting a threshold of the received analog signal in accordance with a threshold adjust signal to generate a threshold adjusted signal; sampling the threshold adjusted signal to generate a sampled signal; generating a histogram from the sampled signal; processing the histogram to generate an error signal, wherein processing includes calculating a difference between y-intersects of at least two substantially straight curves defined by log values from the histogram, wherein the y-axis represents the distribution of the received signal; and generating the threshold adjust signal in accordance with the error signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A communications system comprising:
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a threshold adjust circuit configured to adjust a threshold of a received signal in accordance with a threshold adjust signal to generate a threshold adjusted signal; an analog to digital converter configured to sample the threshold adjusted signal in accordance with a clock signal to generate a sampled signal; and a threshold adjust loop configured to; generate a histogram from the sampled signal; calculate a difference between y-intersects of at least two substantially straight curves defined by log values from the histogram, wherein the y-axis represents the distribution of the received signal; process the histogram to generate an error signal; and generate the threshold adjust signal in accordance with the error signal. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A communications apparatus comprising:
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receiving means for receiving an analog signal; adjusting means for adjusting a threshold of the received analog signal in accordance with a threshold adjust signal to generate a threshold adjusted signal; sampling means for sampling the threshold adjusted signal to generate a sampled signal; histogram generating means for generating a histogram from the sampled signal; processing means for processing the histogram to generate an error signal, wherein the processing means includes a calculating means for a difference between y-intersects of at least two substantially straight curves defined by log values from the histogram, wherein the y-axis represents the distribution of the received signal; and signal generating means for the threshold adjust signal in accordance with the error signal. - View Dependent Claims (23, 24, 25)
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Specification