Method and apparatus for joint detection of a coded signal in a CDMA system
US6587501B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 30, 2001 |
| Grant date | Jul 1, 2003 |
| Priority date | — |
| Expiry date | Nov 3, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/7107
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
The present invention achieves the benefits of the improved joint detector previously disclosed with significantly less computation by, first, moving the backward substitution computation outside the detector's decoding iteration loop and, second, by moving the input buffer inside the iteration loop. The backward substitution computation is performed initially as part of a joint detection equalization stage prior to entering the decode iteration loop. Then with each decode iteration, the present invention generates a correction signal that is subtracted from the present input signal to produce the next input signal. Each correction signal is generated from a series of differences between the decoded symbols of the current iteration and those in the previous iteration. Thus, the present invention achieves the same performance improvement over conventional joint detectors as the improved joint detector previously disclosed but with dramatically less computational requirements.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.