Decision feedback equalizer method and apparatus
US5490169A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 16, 1993 |
| Grant date | Feb 6, 1996 |
| Priority date | — |
| Expiry date | Jun 16, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L25/066
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A decision feedback equalizer is suitable for use with a bipolar return-to-zero receiver. The equalizer determines an output Y(n) (160) based on a compensated received value X(n) (104) and a correction factor, D(n) (141 ). After receiving X(n), the equalizer retrieves a stored value D(n) corresponding to the k prior output values Y(n-1), . . . , Y(n-k) from a memory device (140). The equalizer then forms an equalized received value X'(n) (107) based on combining X(n) with D(n). The equalizer then determines the output value Y(n) based on comparing X'(n) with a positive threshold, V1 and a negative threshold, V2. When Y(n) is determined to be zero, the equalizer adjusts the stored correction value D(n) by a predetermined value, .DELTA., based on whether X'(n) is positive or negative.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.