Stepwise adaptive finite impulse response filter for spread spectrum radio
US6438156B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 11, 1999 |
| Grant date | Aug 20, 2002 |
| Priority date | — |
| Expiry date | Feb 11, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2025/03617
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A distortion compensation filtering mechanism for a direct spread-spectrum radio receiver comprises an iteratively adaptive FIR filter installed in the received signal processing path of the radio just upstream of the despreading function. The filter may be implemented as a relatively small numbered tap filter, having its precursor tap fixed at a maximum value. The remaining filter tap values are individually adaptively adjusted by the radio's control processor, which executes a tap adjustment routine to iteratively increment or decrement each variable tap value of the FIR filter to an ‘optimized’ value, that effectively minimizes the total (I and Q) power in the error in the data decisions performed by data signal analyzer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.