Method and apparatus for detection of a frequency coded sequence in the presence of sinusoidal interference
US7672356B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 19, 2005 |
| Grant date | Mar 2, 2010 |
| Priority date | — |
| Expiry date | Jan 27, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B2001/7152
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A communication device according to the present invention detects a frequency-hopped signal in an environment including sinusoidal interference. The frequency-hopped signal includes a frequency shift keying (FSK) sequence, where the sequence alternates between frequencies shifted from the carrier signal or hop frequency by positive and negative frequency offsets. The communication device of the present invention uses independent detection paths for each of the shifted frequencies. In the detection path for the upper frequency (e.g., positive frequency shift), a series of filters suppresses signals in the lower frequency band (e.g., negative frequency shift), while the detection path for the lower frequency employs a separate series of filters to suppress signals in the upper frequency band. The filter outputs from each detection path are separately examined to detect the presence of an expected signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.