All-lag spread-spectrum correlators with rotating references
US6847676B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 30, 2000 |
| Grant date | Jan 25, 2005 |
| Priority date | — |
| Expiry date | Jan 25, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B2001/70706
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An all-lag rotating-reference correlator correlates a received spread-spectrum signal with a rotating reference code, and produces in each sampling instance N correlation lags corresponding to the correlation of the received signal with 0, 1, . . . , N−1 lags (or delays) of the rotating reference code, wherein N is the length of the rotating reference code. The rotating reference code is time-variant and is generated by a rotation of a basic reference code. The received signal, possibly embedded in noise and interference, consists of periodic replicas of the basic reference code with or without data modulation. The first embodiment of the present invention describes a method and apparatus of an all-lag rotating-reference correlator which is applicable to situations where data modulation is not present in the received signal. The second embodiment of the present invention describes a method and apparatus of an all-lag rotating-reference correlator which is applicable for situations where data modulation is present in the received signal. Corresponding methods and apparatus are also described when only a number of selected correlation lags are required to be generated. Each apparatus…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.