Preamble detection with multiple receive antennas
US7991077B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 25, 2007 |
| Grant date | Aug 2, 2011 |
| Priority date | — |
| Expiry date | Oct 18, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/2675
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A system including a differential demodulation module that receives modulated signals from R antennas and that differentially demodulates the modulated signals to generate differentially demodulated signals, where R is an integer greater than or equal to 1. A summing module sums the differentially demodulated signals to generate a combined signal. A correlation module correlates the combined signal with derived preamble sequences and generates correlation values based on the correlation. The derived preamble sequences are derived from preamble sequences. Each bit of one of the derived preamble sequences has a first state when a corresponding bit and a bit adjacent to the corresponding bit in a corresponding one of the preamble sequences have opposite states. Each bit has a second state when the corresponding bit and the bit adjacent to the corresponding bit have the same state.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.