CDMA multiple access interference cancellation using signal estimation
US6404760B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 19, 1999 |
| Grant date | Jun 11, 2002 |
| Priority date | — |
| Expiry date | Jul 19, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B2201/70701
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Several methods and corresponding apparatus to reduce multiple access interference in code division multiple access communications systems through successive interference cancellation techniques. An estimate of reliability of cancellation of a strongest interfering signal is formed from analysis of a pilot signal associated with the strongest signal. The estimate is used to derive a weight that is multiplied by a replica of the strongest signal to provide a weighted replica. The weighted replica is subtracted from a delayed version of the received channel. As a result, interference cancellation is robustly implemented when the strongest signal replica is most likely to be accurate and is not robustly implemented when the strongest signal replica is not likely to be accurate. This avoids combining a replica of the strongest signal with the received channel when the replica is more likely to contribute additional interference rather than reduce it.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.