Method and apparatus for suppressing linear amplitude interference from bandspread communication signals
US5495496A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 26, 1991 |
| Grant date | Feb 27, 1996 |
| Priority date | — |
| Expiry date | Sep 26, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/69
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A method and apparatus are provided for suppressing linear amplitude interence (e.g., on-off interference) from a sequence of bandspread communication signals generated by a radio receiver. Each sample is defined as a vector having signal and interference vector components. The interference vector component is such that the amplitude of the interference: 1) is essentially linear, and 2) dominates the signal component. To suppress the linear amplitude interference, a pseudo second derivative is obtained for each sample based upon the current, previous and subsequent sample amplitudes. The pseudo second derivative for each current sample is transformed into a corresponding pseudo second derivative vector based on a symmetric sampling of pseudo second derivatives from previous and subsequent received signal samples. All terms of each corresponding pseudo second derivative vector are summed and averaged to generate a corresponding average enhanced signal gain for each sample. Each corresponding average enhanced signal gain is multiplied by a normalized vector approximately parallel to the corresponding sample's interference vector component. This estimates the signal vector component t…
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