Method and apparatus for preamble training with shortened long training field in a multiple antenna communication system
US7903755B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 8, 2006 |
| Grant date | Mar 8, 2011 |
| Priority date | — |
| Expiry date | Feb 3, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/261
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Methods and apparatus are provided for communicating data in a multiple antenna communication system having N transmit antennas. According to one aspect of the invention, a header format includes a legacy preamble having at least one legacy long training field and an extended portion having at least N additional long training fields on each of the N transmit antennas, wherein one or more of the at least N additional long training fields are comprised of only one Orthogonal Frequency Division Multiplexing (OFDM) symbol. The extended portion optionally comprises one or more repeated OFDM symbols for frequency offset estimation. In one implementation, the extended portion comprises a first high throughput long training field comprised of two repeated OFDM symbols and N−1 high throughput long training fields comprised of only one OFDM symbol. In another variation, the extended portion comprises N high throughput long training fields comprised of only one OFDM symbol.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.