Frame format for high data throughput wireless local area network transmissions
View Patent ↗A frame format for high data throughput wireless local area network transmissions includes a first preamble segment, a second preamble segment, and a variable length data segment. The first preamble segment includes a first training sequence, a second training sequence, and a high throughput channel indication, 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. The second preamble segment includes a third training sequence within a third set of subcarriers of the channel, wherein the second set of subcarriers is a subset of the third set of subcarriers. The variable length data segment utilizes the third set of subcarriers to convey data.
1. A frame format for high data throughput wireless local area network transmissions, the frame format comprises:
a first preamble segment including a first training sequence, a second training sequence, and a high throughput channel indication, 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 third training sequence within a third set of subcarriers of the channel, wherein the second set of subcarriers is a subset of the third set of subcarriers; and
a variable length data segment utilizing the third set of subcarriers to convey data.
2. The frame format of claim 1 , wherein the first preamble segment comprises:
the first training sequence corresponding to a short training sequence;
the second training sequence corresponding to a long training sequence; and
a signal field that includes a rate indication, an indication of length of the variable length data segment, and the high throughput channel indication.
3. The frame format of claim 1 , wherein the second preamble segment comprises:
a channel format indication field to identify one of a plurality of high throughput channel formats; and
high throughput channel training field that includes the third training sequence, wherein the third training sequence corresponds to the one of the plurality of high throughput channel formats.
4. The frame format of claim 3 , wherein the plurality of high throughput channel formats comprises at least two of:
a 40 Mega Hertz (MHz) channel with 2 N subcarriers transmitted via a single antenna;
a 20 MHz channel with 2 M subcarriers transmitted via the single antenna;
a 10 MHz channel with 2 K subcarriers transmitted via the single antenna;
the 40 MHz channel with 2 N subcarriers transmitted via multiple antennas;
the 20 MHz channel with 2 M subcarriers transmitted via the multiple antennas; and
the 10 MHz channel with 2 K subcarriers transmitted via the multiple antennas.
5. The frame format of claim 4 , wherein, when the one of the plurality of high throughput channel formats is the 40 MHz channel with 2 N subcarriers transmitted via the single antenna, the third training sequence comprises:
a final channel estimation using the 2 N subcarriers of the 40 MHz channel.
6. The frame format of claim 4 , wherein, when the one of the plurality of high throughput channel formats is the 20 MHz channel with 2 M subcarriers transmitted via the single antenna, the third training sequence comprises:
a final channel estimation using the 2 M subcarriers of the 20 MHz channel.
7. The frame format of claim 4 , wherein, when the one of the plurality of high throughput channel formats is the 10 MHz channel with 2 K subcarriers transmitted via the single antenna, the third training sequence comprises:
a final channel estimation using the 2 K subcarriers of the 10 MHz channel.
8. The frame format of claim 4 , wherein, when the one of the plurality of high throughput channel formats is the 40 MHz channel with 2 N subcarriers transmitted via the multiple antennas, the third training sequence comprises:
a first final channel estimation using the 2 N subcarriers of the 40 MHz channel transmitted via a first one of the multiple antennas; and
a second final channel estimate using the 2 N subcarriers of the 40 MHz channel transmitted via a second one of the multiple antennas.
9. The frame format of claim 4 , wherein, when the one of the plurality of high throughput channel formats is the 20 MHz channel with 2 M subcarriers transmitted via the multiple antennas, the third training sequence comprises:
a first final channel estimation using the 2 M subcarriers of the 20 MHz channel transmitted via a first one of the multiple antennas; and
a second final channel estimate using the 2 M subcarriers of the 20 MHz channel transmitted via a second one of the multiple antennas.
10. The frame format of claim 4 , wherein, when the one of the plurality of high throughput channel formats is the 10 MHz channel with 2 K subcarriers transmitted via the multiple antennas, the third training sequence comprises:
a first final channel estimation using the 2 K subcarriers of the 10 MHz channel transmitted via a first one of the multiple antennas; and
a second final channel estimate using the 2 K subcarriers of the 10 MHz channel transmitted via a second one of the multiple antennas.
11. An apparatus for transmitting a frame within a high throughput wireless local area network, the apparatus comprises:
processing module;
memory operably coupled to the processing module, wherein the memory stores operational instructions that cause the processing module to prepare the frame by:
generating a first preamble segment including a first training sequence, a second training sequence, and a high throughput channel indication, 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;
generating a second preamble segment including a third training sequence within a third set of subcarriers of the channel, wherein the second set of subcarriers is a subset of the third set of subcarriers;
generating a variable length data segment utilizing the third set of subcarriers to convey data; and
radio frequency transmission circuit operably coupled to transmit the first preamble segment, the second preamble segment, and the variable length data segment as the frame.
12. The apparatus of claim 11 , wherein the first preamble segment comprises:
the first training sequence corresponding to a short training sequence;
the second training sequence corresponding to a long training sequence; and
a signal field that includes a rate indication, an indication of length of the variable length data segment, and the high throughput channel indication.
13. The apparatus of claim 11 , wherein the second preamble segment comprises:
a channel format indication field to identify one of a plurality of high throughput channel formats; and
high throughput channel training field that includes the third training sequence, wherein the third training sequence corresponds to the one of the plurality of high throughput channel formats.
14. The apparatus of claim 13 , wherein the plurality of high throughput channel formats comprises at least two of:
a 40 Mega Hertz (MHz) channel with 2 N subcarriers transmitted via a single antenna;
a 20 MHz channel with 2 M subcarriers transmitted via the single antenna;
a 20 MHz channel with 2 K subcarriers transmitted via the single antenna;
a 40 MHz channel with 2 N subcarriers transmitted via multiple antennas;
a 20 MHz channel with 2 M subcarriers transmitted via the multiple antennas; and
a 10 MHz channel with 2 K subcarriers transmitted via the multiple antennas.
15. The apparatus of claim 14 , wherein, when the one of the plurality of high throughput channel formats is the 40 MHz channel with 2 N subcarriers transmitted via the single antenna, the third training sequence comprises:
a final channel estimation using the 2 N subcarriers of the 40 MHz channel.
16. The apparatus of claim 14 , wherein, when the one of the plurality of high throughput channel formats is the 20 MHz channel with 2 M subcarriers transmitted via the single antenna, the third training sequence comprises:
a final channel estimation using the 2 M subcarriers of the 20 MHz channel.
17. The apparatus of claim 14 , wherein, when the one of the plurality of high throughput channel formats is the 10 MHz channel with 2 K subcarriers transmitted via the single antenna, the third training sequence comprises:
a final channel estimation using the 2 K subcarriers of the 10 MHz channel.
18. The apparatus of claim 14 , wherein, when the one of the plurality of high throughput channel formats is the 40 MHz channel with 2 N subcarriers transmitted via the multiple antennas, the third training sequence comprises:
a first final channel estimation using the 2 N subcarriers of the 40 MHz channel transmitted via a first one of the multiple antennas; and
a second final channel estimate using the 2 N subcarriers of the 40 MHz channel transmitted via a second one of the multiple antennas.
19. The apparatus of claim 14 , wherein, when the one of the plurality of high throughput channel formats is the 20 MHz channel with 2 M subcarriers transmitted via the multiple antennas, the third training sequence comprises:
a first final channel estimation using the 2 M subcarriers of the 20 MHz channel transmitted via a first one of the multiple antennas; and
a second final channel estimate using the 2 M subcarriers of the 20 MHz channel transmitted via a second one of the multiple antennas.
20. The apparatus of claim 14 , wherein, when the one of the plurality of high throughput channel formats is the 10 MHz channel with 2 K subcarriers transmitted via the multiple antennas, the third training sequence comprises:
a first final channel estimation using the 2 K subcarriers of the 10 MHz channel transmitted via a first one of the multiple antennas; and
a second final channel estimate using the 2 K subcarriers of the 10 MHz channel transmitted via a second one of the multiple antennas.