Method and apparatus for robust two-stage OFDM channel estimation
US9537678B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 21, 2014 |
| Grant date | Jan 3, 2017 |
| Priority date | — |
| Expiry date | Jan 9, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L5/0051
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Methods, apparatuses, and systems for improved channel estimation in an Orthogonal Frequency Division Multiplexing (OFDM) system are discussed. In one example discussed herein, joint two-dimensional Minimum Mean-Square Error (2D-MMSE) channel estimation is performed on any Resource Element (REs) containing a reference signal in a Resource Block (RB), one-dimensional Minimum Mean-Square Error (1D-MMSE) channel estimation is performed in the frequency domain on each OFDM symbol in the RB, and then channel estimation is performed in the time domain on each frequency sub-carrier in the RB. In another example discussed herein, Power Delay Profiles (PDPs) and/or frequency correlations are calculated using minimax optimization and then stored in a Look-Up Table (LUT) indexed by estimated Signal to Noise Ratio (SNR) and the estimated maximum delay spread. A portable device could use such an LUT in MMSE calculations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.