FFT numerology for an OFDM transmission system
US7881398B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 15, 2007 |
| Grant date | Feb 1, 2011 |
| Priority date | — |
| Expiry date | Oct 9, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/2634
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
An exemplary fast Fourier transform (FFT) numerology for an orthogonal frequency division multiple access (OFDMA) downlink transmission system is described. The exemplary FFT numerology reduces the FFT sampling rate for a given transmission bandwidth, thereby increasing the battery life of a UE. The FFT numerology increases robustness against Doppler spread, phase noise, and frequency offset, enabling operation in channels with high delay spread, such as occurs in mountainous regions. The described numerology might provide the following without altering standard sub-frame duration: increased intercarrier spacing; reduced FFT sampling frequency across the transmission bandwidths; reduced FFT size across all transmission bandwidths; increased number of OFDM symbols per sub-frame; and/or increased cyclic prefix length choices.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.