Apparatus and method for determining positions of pilot sub-carriers in an OFDM symbol
US7876844B2 · kind B2 · utility
Assignees
Inventor
Key dates
| Filing date | Jan 31, 2008 |
| Grant date | Jan 25, 2011 |
| Priority date | — |
| Expiry date | Sep 4, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/2659
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Techniques for determining positions of pilot sub-carriers in a received OFDM symbol are described. Components of pilot sub-carriers from a theoretical OFDM symbol are extracted to form M theoretical pilot sequences according to M possible distributions in frequency domain of the pilot sub-carriers in the theoretical OFDM symbol. Components of pilot sub-carriers from the received OFDM symbol are also extracted to form K hypothetical pilot sequences according to K possible distributions in frequency domain of pilot sub-carriers in the received OFDM symbol. The correlations of every two adjacent elements of the theoretical pilot sequences are calculated to get M corresponding theoretical correlation sequences, and the correlations of every two adjacent elements of the hypothetical pilot sequence are also calculated to get K corresponding hypothetical correlation sequences. Sequence correlations between the hypothetical correlation sequences and the theoretical correlation sequences are then calculated. The positions of pilot sub-carriers in the received OFDM symbol can be determined from the one that has the maximum modulus value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.