Sampling frequency offset estimation apparatus and method for OFDM system
US7702024B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 19, 2006 |
| Grant date | Apr 20, 2010 |
| Priority date | — |
| Expiry date | Jan 24, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/2679
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A sampling frequency offset estimation apparatus and method to be applied to an OFDM (orthogonal frequency division multiplexing) system are provided. The apparatus includes an ADC (analog-to-digital converter) sampling a received signal based on a predetermined sampling frequency; a FFT (Fast Fourier Transform) unit transforming the sampled received signal into a frequency domain; a phase calculator calculating phase shifts of pilot subcarriers of the sampled received signal which has been transformed into the frequency domain; a determiner calculating phase shift reaching times at which samples of the pilot subcarriers shift due to the phase shift; a time offset calculator calculating a sampling time offset using the pilot subcarriers, and a frequency offset calculator calculating a sampling frequency offset based on the phase shift reaching times and the sampling time offset.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.