Windowing function for maintaining orthogonality of channels in the reception of OFDM symbols
US6269132A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 26, 1999 |
| Grant date | Jul 31, 2001 |
| Priority date | — |
| Expiry date | Apr 26, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/265
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A windowing mechanism for processing an OFDM symbol is presented. The windowing mechanism applies an apodizing window function having the property W.sub.j +W.sub.(FFTSize/2 +j) =constant, where FFTSize is the size of the FFT sample, to a received OFDM symbol sample and a time-offset version of the OFDM symbol sample to produce sets of windowed values. The time-offset sample is offset from the original symbol by one half the symbol period. The time-offset windowed sample is shifted into realignment with the windowed original symbol. Corresponding ones of the windowed values are summed together to restore the windowed symbol to its original form.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.