Estimating frequency-offsets and multi-antenna channels in MIMO OFDM systems
US8718185B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 26, 2013 |
| Grant date | May 6, 2014 |
| Priority date | — |
| Expiry date | Feb 26, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/2695
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Techniques are described for carrier frequency offset (CFO) and channel estimation of orthogonal frequency division multiplexing (OFDM) transmissions over multiple-input multiple-output (MIMO) frequency-selective fading channels. A wireless transmitter forms blocks of symbols by inserting training symbols within two or more blocks of information-bearing symbols. The transmitter applies a hopping code to each of the blocks of symbols to insert a null subcarrier at a different position within each of the blocks of symbols, and a modulator outputs a wireless signal in accordance with the blocks of symbols. A receiver receives the wireless signal and estimates the CFO, and outputs a stream of estimated symbols based on the estimated CFO.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.