Schemes for detecting guard intervals in OFDM system
US8605806B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 30, 2012 |
| Grant date | Dec 10, 2013 |
| Priority date | — |
| Expiry date | Mar 30, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/2688
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A receiver and method of detecting a guard interval estimate accurately by performing an Nth order polynomial based non-linear quantization on a pre-estimated guard interval in a received Orthogonal Frequency Division Multiplexing (OFDM) signal in a receiver is provided. The pre-estimated guard interval is obtained by performing normalized auto-correlation on the received OFDM signal. The method includes (i) performing a rounding operation on (a) one or more mth coefficient of the polynomial and (b) the pre-estimated guard interval to obtain an indexing parameter ‘k’, and detecting the guard interval estimate based on (i) a value of k, and (ii) a guard interval from one or more guard intervals that are stored in a look up table. The guard interval estimate is detected in accordance with an equation: {tilde over (L)}=L[k−4], where ‘L’ is the guard interval stored in the look up table that corresponds to the value of k.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.