Patent Document ID: 7978729
Application ID: 11833429
Patent Flag: 1

Claim One:
1. An apparatus for transmitting a frame with a frame format for high data throughput wireless local area network transmissions comprising: a radio transmitter section operable to generate the frame with a frame format, wherein the frame format includes: a first preamble segment including a first and second training sequence in accordance with legacy lower data throughput standards and a signal field for indicating when high throughput channel operations are supported, wherein the first training sequence is within a first set of subcarriers of a channel and the second training sequence is within a second set of subcarriers of the channel, wherein the first set of subcarriers is a subset of the second set of subcarriers; a second preamble segment including a high data throughput training sequence when high throughput channel operations are supported and including a null segment when high throughput channel operations are not supported and a channel format indication field to identify one of a plurality of high throughput channel formats; and a variable length data segment following the second preamble segment.