System and method for blind estimation of multiple carrier frequency offsets and separation of user signals in wireless communications systems
US7929937B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 24, 2007 |
| Grant date | Apr 19, 2011 |
| Priority date | — |
| Expiry date | Jan 11, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2027/003
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A system and method for blind estimation of carrier frequency offsets (CFOs) and separation of user signals in wireless communications systems are provided. Blind estimation of CFOs (i.e., without knowledge of the conditions of the transmitter or the transmission medium/channel) is carried out in order to improve reception quality by a wireless communications device. A received RF signal is over-sampled by a pre-defined over-sampling factor, and polyphase components are extracted from the over-sampled signal. The polyphase components are used to construct a virtual receiver output matrix, e.g., a model of the received signal and its associated output matrix. System response conditions are blindly estimated by applying a blind system estimation algorithm to the virtual receiver output matrix. A plurality of CFO estimates are obtained from the estimated system response conditions, and can be used by an equalizer to adjust receiver parameters in accordance with the CFO estimates so as to maximize reception quality and to extract multiple user signals from the received signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.