CDMA demodulating apparatus
US6137788A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 12, 1997 |
| Grant date | Oct 24, 2000 |
| Priority date | — |
| Expiry date | Feb 12, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W52/12
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A CDMA demodulating apparatus with an improved interference canceling effect when there are a large number of communicators. A reception signal having a frame configuration in which a pilot signal of a known pattern is inserted between information signals is received from a plurality of communicators. Transmission data of each communicator is demodulated, an interference canceler for estimating is provided in a plurality of stages, in each channel of each stage, a variation of transmission path is estimated in each path to achieve data demodulation and estimation of interference replica. The later the stage, the more error of interference signal replica can be reduced, thereby improving the interference canceling effect. An even better effect can be obtained when interference canceling is performed after detecting a reception level of each channel by summation of reception power of each path of each channel, and channel ranking is determined in the order of higher reception level.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.