Rapid signal acquisition by spread spectrum transceivers
US6757323B1 · kind B1 · utility
Inventors
Key dates
| Filing date | Nov 22, 2000 |
| Grant date | Jun 29, 2004 |
| Priority date | — |
| Expiry date | Oct 25, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B2201/70709
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Spread spectrum transceivers communicate using code sequences having low cross-correlations and well-peaked autocorrelations. The initial communications involve broadcasting a beacon signal consisting of a beacon packet repeated at regular intervals (the cycle time). The code sequences may be period-(2n−1) Small Kasami sequences; the beacon packet is a repeated series of (2n/2+1) period-(2n/2−1) progenitor maximal sequences, and behaves like a member of the Kasami family. The acyclic autocorrelation of the beacon packet has regularly-spaced sharp peaks modulated by a pyramidal envelope. The initial communications involve calculating the correlation between the received signal and delayed versions of an internally-generated beacon packet. The length of the initial communications is proportional to the square of the cycle time divided by the width of the acyclic autocorrelation. Synchronization involves locating the peak of the pyramidal envelope, and has a length related to the cycle time times the number of peaks in the acyclic autocorrelation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.