Method and apparatus for signal acquisition in OFDM receivers
US8605843B2 · kind B2 · utility
Inventors
Key dates
| Filing date | Aug 6, 2008 |
| Grant date | Dec 10, 2013 |
| Priority date | — |
| Expiry date | Jan 31, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/2662
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for signal acquisition in an OFDM receiver relies on a preamble training sequence to synchronize the receiver in time (e.g. determining the start of a frame) and in frequency (carrier frequency offset compensation). The preamble training sequence has a periodic structure and the method and apparatus perform a cross-correlation technique using a matched filter to achieve time synchronization and/or frequency synchronization and/or channel estimation, the latter being especially useful in multi-antenna receivers for diversity combining purposes. Many advantages derive from performing at least two and preferably all three operations jointly, in terms of latency, hardware complexity, and length of training sequence required to achieve satisfactory convergence on all counts. The periodicity of the training sequence is exploited to reduce considerably the main filter complexity and optionally dynamically adjust carrier offset compensation throughout the filtering process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.