US 2019/0356393 A1 · CONSTELLATION SELECTION THRESHOLD ADAPTATION FOR SLICER

Abstract

System and method of adapting thresholds for constellation selection based on statistic distributions of received data symbols. To determine an adapted threshold, an expected ratio of received symbols with values in a certain range is preset based on an expected statistic distribution of data symbols across the multiple constellations. A first and a second ratios are defined based on the expected ratio, the first ratio being the expected ratio minus an error ratio and the second ratio being the expected ratio plus the error ratio. A first value is determined which makes the received symbols in a firs range to constitute the first ratio of a set of slicer inputs. A second value is determined which makes the received symbols in the second range to constitute the second ratio of a set of slicer outputs. The adapted threshold is then obtained based on the first and the second value.

Claims20

Dependent claims

A method of dynamically determining thresholds of a slicer, the method comprising:

accessing a first plurality of inputs for supply to said slicer;
comparing each of said first plurality of inputs with a first value;
based on said comparing with said first value, determining a first count ratio of first inputs to said first plurality of inputs, wherein each of said first inputs is comprised in said first plurality of inputs and has a value encompassed in a first range that is defined by said first value;
and
determining a first threshold of said slicer based on said first value and said first count ratio.

2 more elements

A device comprising:

a slicer decision unit configured to:
produce a first output value responsive to an input greater than a threshold;
and
produce a second output value responsive to an input smaller than said threshold;
and
a threshold adaptation unit coupled to said slicer decision unit comprising:
a comparator configured to compare each of a first plurality of inputs with a first value, wherein said first plurality of inputs are supplied to said slicer decision unit;
a first counter configured to, responsive to comparison decisions output from said comparator, produce a number of first inputs comprised in said first plurality of inputs and each having a value encompassed in a first range, wherein said first range is defined by said first value;
and
logic configured to:
determine a first count ratio of said number of said first inputs to a total number of said first plurality of inputs;
and
determine a first threshold of said slicer decision unit based on said first value and said first count ratio.

10 more elements

A receiver comprising:

a analog-to-digital converter (ADC) configured to converted received analog signals to digital signals;
an equalizer coupled to said ADC and configured to:
generate equalized signals responsive to digital signals;
and send said equalized signals as inputs to a slicer decision unit;
said slicer decision unit coupled to said equalizer and configured to:
produce a first output value responsive to an input greater than a threshold;
and
produce a second output value responsive to an input smaller than said threshold;
and
a threshold adaptation unit coupled to said slicer decision unit and configured to :
access a first plurality of inputs for supply to said slicer decision unit;
compare each of said first plurality of inputs with a first value;
based on comparison with said first value, determine a first count ratio of first inputs to said first plurality of inputs, wherein each of said first inputs is comprised in said first plurality of inputs and has a value encompassed in a first range that is defined by said first value;
access a second plurality of inputs for supply to said slicer;
compare each of said second plurality of inputs with a second value;
based on comparison with said second value, determine a second count ratio of second inputs to said second plurality of inputs, wherein each of said second inputs is comprised in said second plurality of inputs and has a value encompassed in a second range that is defined by said second value;
determine an adapted threshold based on said first value, second value, said first count ratio and said second count ratio;
and
send said adapted threshold to said slicer decision unit.

16 more elements

Dependencies are inferred from the claim text.

Constellation selection threshold adaptation for slicer

Life of this patent

Constellation selection threshold adaptation for slicer

Life of this patent

Abstract

Claims20