Method and apparatus for improved long preamble formats in a...

Details Method and apparatus for improved long preamble formats in a... Method and apparatus for improved long preamble formats in a...

2006-08-21

2010-06-22

Phan, Tri H (Department: 2471)

Multiplex communications

Generalized orthogonal or special mathematical techniques

Plural diverse modulation techniques

C370S208000, C370S334000, C375S267000

Reexamination Certificate

active

07742390

ABSTRACT:
Methods and apparatus are provided for improved long preamble formats in a multiple antenna communication system having N antennas. According to one aspect of the invention, a preamble having a legacy portion and a high throughput portion is transmitted (or received) on each of the N transmit antennas, wherein the legacy portion comprises a legacy long training field and the high throughput portion comprises at least N high throughput long training fields, wherein the N high throughput long training fields are transmitted in N time slots using an N×N orthogonal matrix. The orthogonal matrix can be, for example, one or more of a Walsh matrix and a Fourier matrix. The N time slots can optionally comprise a single symbol.

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