Blind carrier frequency offset estimator based on single-OFDM-symbol PN ranging code in multi-user OFDMA uplink
US7742392B2 · kind B2 · utility
11Cited by
3References
16Claims
0Family size
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Key dates
| Filing date | Aug 2, 2007 |
| Grant date | Jun 22, 2010 |
| Priority date | — |
| Expiry date | Jan 15, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/2676
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A blind carrier frequency offset estimator is based on a single-OFDM-symbol training sequence in multi-user OFDMA uplink. Through multiple access interference modeling and analysis, a virtual user is employed that occupies the all null sub-carriers. By minimizing the energy leakage on the virtual user in term of tentative frequency offsets, the estimator can approach the real frequency offset. The estimator performs only on frequency-domain, simplifies interference calculations, and lowers the rank of the matrix. An iterative computation method is used to approach the real frequency offset.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.