Mid-packet clear channel assessment
US8411807B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 2, 2008 |
| Grant date | Apr 2, 2013 |
| Priority date | — |
| Expiry date | Sep 25, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L7/08
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A mid-packet detection technique is provided that detects a packet with periodic repetitions of a fixed duration at a point in time of the packet other than a start-of-packet pattern, e.g., a preamble, associated with the packet. The process performs packet detection without detecting a preamble and does not require carrier frequency recovery, timing recovery (synchronization) or channel estimation. In one embodiment, a doubly differential matched filter autocorrelation of the received signal is computed and used as a metric for packet detection when the preamble is not observed or to complement preamble detection. The metric is compared to a threshold to indicate detection of a packet.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.