108-tap 1:4 interpolation FIR filter for digital mobile telecommunication
US6888904B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 24, 2001 |
| Grant date | May 3, 2005 |
| Priority date | — |
| Expiry date | Jun 5, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H17/0607
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A 108-tap 1:4 interpolation FIR filter device for digital mobile telecommunication having a single bit input that employs a look-up table minimum scheme and a pipeline structure in which the size of the entire look-up tables is significantly reduced by dividing four coefficient groups into three parts, respectively, and effectively using the symmetry of the 108-tap filter coefficient and the symmetry within the look-up table. The FIR filter includes an input shift register and selector for processing a single bit input of four channels, an address generator for producing addresses of the look-up table, look-up table group 0˜3 for producing filter outputs group by group via the look-up table and the calculator using the address as an input, a pipeline register I for delaying the filter outputs for coefficient group which are outputted in parallel, a group selector for converting the delayed outputs in serial channel by channel, and a pipeline register II for matching the time of filter output channel by channel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.