Carrier frequency offset estimation scheme, for digital standards with MPSK modulated preamble
US8611472B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 13, 2012 |
| Grant date | Dec 17, 2013 |
| Priority date | — |
| Expiry date | Apr 13, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2027/0051
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A receiver for reducing acquisition time of a Carrier Frequency Offset (CFO) of an input intermediate frequency (IF) signal with M-PSK modulated preamble using spectral based analysis is provided. The receiver includes an analog to digital converter that converts the input IF signal into a digital signal, a down conversion unit that down converts the digital signal to a baseband complex signal, and a CFO estimation block that estimates the CFO. The CFO estimation block includes a carrier harmonic generation unit that generates an output of carrier Mth harmonic without modulation in the baseband complex signal, a spectral mapping unit that spectrally maps the carrier harmonic using complex Fast Fourier Transform, a spectral analysis unit that performs peak search on the spectrally mapped carrier Mth harmonic to obtain a peak position (PPOS), and a carrier frequency offset estimation unit that receives the peak position (PPOS) and estimates the CFO.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.