Modem receiver with nonlinear equalization
US5226060A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 8, 1992 |
| Grant date | Jul 6, 1993 |
| Priority date | — |
| Expiry date | Jan 8, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B3/14
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A modem with nonlinear equalization (100) receives a signal (101) that includes linear and nonlinear distortion. The modem includes a multiplier (107) that frequency shifts the signal to form a baseband signal, which is then sampled by an A/D converter (114) to provide a complex receiver input sample, R(n). A first equalizer (117) equalizes R(n) to form a first equalized result (n). A nonlinear generator (129) forms .vertline.R(n).vertline..sup.2 R(n), which is then equalized by a second equalizer (133) to form a second equalized result (n). A summing device (121) combines the first equalized result (n) with the second equalized result (n) to form a composite equalized result (n). The modem includes a data recovery circuit (125) that determines a received signal point (n) based on the composite equalized result (n) and a predetermined constellation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.