Apparatus for receiving and recovering frequency shift keyed symbols
US7376207B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 27, 2001 |
| Grant date | May 20, 2008 |
| Priority date | — |
| Expiry date | May 18, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/2334
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A receiver architecture for receiving an FSK signal having a predetermined number of modulation levels includes a selectivity filter (206) for selectively passing a wanted channel and rejecting unwanted channels. The selectivity filter has a filter bandwidth of about one-half the bandwidth of a pre-modulation filter in a transmitter sending the FSK signal. A discriminator (208) is coupled to the selectivity filter for demodulating the signal. A symbol recovery processor (210) is coupled to the discriminator for recovering the symbols through a maximum likelihood sequence estimation (MLSE) technique utilizing N states for each symbol time, wherein N equals the predetermined number of modulation levels, and wherein templates used in the MLSE for symbol transitions are optimized with a bandwidth substantially less than the bandwidth of the pre-modulation filter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.