Method and apparatus for improved short preamble formats in...

Details Method and apparatus for improved short preamble formats in... Method and apparatus for improved short preamble formats in...

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

07742389

ABSTRACT:
Methods and apparatus are provided for improved short preamble formats in a multiple antenna communication system having N antennas. A short preamble format 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 N−1 high throughput long training fields. The legacy long training field and the N−1 high throughput long training fields can be transmitted in N time slots using an N×N orthogonal matrix, such as a Walsh matrix or a Fourier matrix. The N time slots can optionally comprise a single symbol. Backwards compatibility is optionally maintained by including a legacy short training field and a legacy signal field in the legacy portion of the short preamble.

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