Frame formatting for communications within single user, multiple user, multiple access, and/or MIMO wireless communications

Patent metadata

Field	Value
Publication number	US-9923999-B2
Application number	US-201514927813-A
Country	US
Kind code	B2
Filing date	Oct 30, 2015
Priority date	Apr 26, 2012
Publication date	Mar 20, 2018
Grant date	Mar 20, 2018

Abstract

Frame formatting for communications within single user, multiple user, multiple access, and/or MIMO wireless communications. A signal is processed within a communication device using at least two respective downclocking ratios (e.g., a first downclocking ratio applied to a first portion of the signal such as a frame or packet extracted there from, a second downclocking ratio applied to a second portion of the signal). Alternatively, a signal is divided into more than two respective portions, and different respective downclocking ratios are applied to those different respective portions (e.g., a first downclocking ratio applied to a first portion of the signal, and so on up to an n-th downclocking ratio applied to an n-th portion of the signal). Some implementations apply a singular or common downclocking ratio to more than one portion of the signal (which may be contiguous/adjacent or non-contiguous/non-adjacent within the signal).

First claim

What is claimed is:

1. A wireless communication device comprising:
a communication interface; and
processing circuitry that is coupled to the communication interface, wherein at least one of the communication interface or the processing circuitry configured to:
receive a signal from another wireless communication device via a communication channel having a channel bandwidth;
process a first at least one orthogonal frequency division multiplexing (OFDM) symbol of an OFDM packet of the signal based on a first clock signal;
downclock the first clock signal using a downclocking factor to generate a second clock signal;
process a second at least one OFDM symbol of the OFDM packet based on the second clock signal to extend OFDM symbol duration of the second at least one OFDM symbol of the OFDM packet;
downclock the first clock signal using another downclocking factor to generate a third clock signal; and
process a third at least one OFDM symbol of the OFDM packet based on the third clock signal to extend OFDM symbol duration of the third at least one OFDM symbol of the OFDM packet by a different symbol extension amount than the second at least one OFDM symbol of the OFDM packet.

2. The wireless communication device of claim 1 , wherein the at least one of the communication interface or the processing circuitry is further configured to:
receive another signal from the another wireless communication device via the communication channel having the channel bandwidth;
process a fourth at least one OFDM symbol of another OFDM packet of the another signal based on the first clock signal;
downclock the first clock signal using at least one other downclocking factor to generate a fourth clock signal; and
process a fifth at least one OFDM symbol of the another OFDM packet based on the fourth clock signal to extend OFDM symbol duration of the fifth at least one OFDM symbol of the another OFDM packet.

3. The wireless communication device of claim 1 , wherein:
the first OFDM symbol of the OFDM packet includes at least one signal field (SIG); and
the second OFDM symbol of the OFDM packet includes at least one data field.

4. The wireless communication device of claim 1 , wherein the wireless communication device or the another wireless communication device includes a laptop host computer, a personal digital assistant host, a personal computer host or cellular telephone host.

5. The wireless communication device of claim 1 , wherein:
the first at least one OFDM symbol of the OFDM packet includes at least one signal field (SIG);
the second at least one OFDM symbol of the OFDM packet includes at least one of at least one short training field (STF) or at least one long training field (LTF); and
the third at least one OFDM symbol of the OFDM packet includes at least one data field.

6. The wireless communication device of claim 1 , wherein the at least one of the communication interface or the processing circuitry is further configured to:
receive the signal from the another wireless communication device via the communication channel having a 20 MHz channel bandwidth;
downclock the first clock signal using a first downclocking factor of 2 to generate the second clock signal;
process the second at least one OFDM symbol of the OFDM packet based on the second clock signal to extend the OFDM symbol duration of the second at least one OFDM symbol of the OFDM packet by 2;
downclock the first clock signal using a second downclocking factor of 4 to generate a fourth clock signal; and
process a fifth at least one OFDM symbol of the OFDM packet based on the fourth clock signal to extend OFDM symbol duration of the fifth at least one OFDM symbol of the OFDM packet by 4.

7. The wireless communication device of claim 1 further comprising:
an access point (AP), wherein the another wireless communication device includes a wireless station (STA).

8. The wireless communication device of claim 1 further comprising:
a wireless station (STA), wherein the another wireless communication device includes an access point (AP).

9. A wireless communication device comprising:
a communication interface; and
processing circuitry that is coupled to the communication interface, wherein at least one of the communication interface or the processing circuitry configured to:
receive a signal from another wireless communication device via a communication channel having a 20 MHz channel bandwidth;
process a first at least one orthogonal frequency division multiplexing (OFDM) symbol of an OFDM packet of the signal based on a first clock signal;
downclock the first clock signal using a first downclocking factor of 2 to generate a second clock signal;
process a second at least one OFDM symbol of the OFDM packet based on the second clock signal to extend OFDM symbol duration of the second at least one OFDM symbol of the OFDM packet by 2;
downclock the first clock signal using a second downclocking factor of 4 to generate a third clock signal; and
process a third at least one OFDM symbol of the OFDM packet based on the third clock signal to extend OFDM symbol duration of the third at least one OFDM symbol of the OFDM packet by 4.

10. The wireless communication device of claim 9 , wherein:
the first OFDM symbol of the OFDM packet includes at least one signal field (SIG);
the second OFDM symbol of the OFDM packet includes at least one of at least one short training field (STF) or at least one long training field (LTF); and
the third OFDM symbol of the OFDM packet includes at least one data field.

11. The wireless communication device of claim 9 , wherein the at least one of the communication interface or the processing circuitry is further configured to:
receive another signal from the another wireless communication device via the communication channel having the 20 MHz channel bandwidth;
process a third at least one OFDM symbol of another OFDM packet of the another signal based on the first clock signal;
process a fourth at least one OFDM symbol of the another OFDM packet based on the second clock signal to extend OFDM symbol duration of the second at least one OFDM symbol of the OFDM packet by 2;
process a fifth at least one OFDM symbol of the another OFDM packet based on the third clock signal to extend OFDM symbol duration of the second at least one OFDM symbol of the OFDM packet by 4; and
process a sixth at least one OFDM symbol of the another OFDM packet based on the third clock signal to extend OFDM symbol duration of the second at least one OFDM symbol of the OFDM packet by 4.

12. The wireless communication device of claim 9 further comprising:
an access point (AP), wherein the another wireless communication device includes a wireless station (STA).

13. The wireless communication device of claim 9 further comprising:
a wireless station (STA), wherein the another wireless communication device includes an access point (AP).

14. A method for execution by a wireless communication device, the method comprising:
receiving, via a communication interface of the wireless communication device, a signal from another wireless communication device via a communication channel having a channel bandwidth;
processing a first at least one orthogonal frequency division multiplexing (OFDM) symbol of an OFDM packet of the signal based on a first clock signal;
downclocking the first clock signal using a downclocking factor to generate a second clock signal; and
processing a second at least one OFDM symbol of the OFDM packet based on the second clock signal to extend OFDM symbol duration of the second at least one OFDM symbol of the OFDM packet;

Assignees

• Broadcom Corp
• Avago Technologies General Ip

Inventors

• Porat Ron

Classifications

• H04W72/04

  Wireless resource allocation · CPC title

• H04L69/22 Primary

  Parsing or analysis of headers · CPC title

• H04L5/0005

  Time-frequency · CPC title

• H04L27/263

  modification of IFFT/IDFT modulator for performance improvement · CPC title

• H04L27/2613 Primary

  Structure of the reference signals · CPC title