Granted Patent B2

US 7,751,429 · App. 10/973,611 · Granted Jul 6, 2010

Abstract

Claims (100)

1. A method for wireless communication in a network that includes non-legacy devices, the method comprises:

determining whether a legacy device is within a proximal region of the wireless communication;

when the legacy device is within the proximal region, formatting a frame to include:

a first portion having:

a legacy preamble; and

a signal field;

a second portion having:

an extended preamble; and

at least one additional signal field; and

a third portion that includes at least one of:

at least one service field;

an inter frame gap; and

a data field;

wherein the first portion is readable by the legacy device in accordance with a legacy frame format;

wherein the second portion is unreadable by the legacy device in accordance with the legacy frame format;

and wherein the second portion is readable by the non-legacy devices in accordance with a non-legacy frame format.

2. The method of claim 1 further comprises:

when the legacy device is not within the proximal region, formatting a frame to include:

a native preamble;

at least one signal field;

at least one service field;

an inter frame gap; and

a data field.

3. The method of claim 2 , wherein the at least one signal field comprises at least one of:

rate/mode information;

length information;

last data unit in the frame indication;

data unit acknowledgment requirement; and

error checking capability.

4. The method of claim 2 further comprises at least one of:

coding the at least one signal field using a rate ½ convolutional code;

coding the at least one signal field using an outer Reed-Solomon block code and an inner coding of the rate ½ convolutional code; and

coding the at least one signal field using a rate ⅓ convolutional code with a constraint length of six.

5. The method of claim 2 further comprises at least one of:

for a legacy channel, utilizing a quadrature phase shift keying (QPSK) for the at least one signal field; and

for a wide bandwidth channel:

utilizing QPSK for subcarriers of a first portion of the wide bandwidth channel, wherein the first portion has a bandwidth corresponding to the legacy channel; and

replicating the first portion for a second portion of the wide bandwidth channel.

6. The method of claim 3 , wherein the rate/mode information comprises at least one of:

implicit number of transmit antennas;

implicit channel width; and

physical layer data rate.

7. The method of claim 3 , wherein the length information comprises at least one of:

bytes of PSDU [PLCP (physical layer convergence procedure) Service Data Unit].

8. The method of claim 1 , wherein the signal field comprises at least one of:

rate/mode information;

length information;

last data unit in the frame indication; and

number of antennas.

9. A radio frequency (RF) transmitter for use in communicating with legacy devices that operate in accordance with a first frame format and non-legacy devices that communicate in accordance with a second frame format, the RF transmitter comprises:

a baseband processing module operably coupled to convert outbound data into an outbound symbol stream; and

a transmitter section operably coupled to convert the outbound symbol stream into outbound RF signals, wherein the baseband processing module is operably coupled to:

determine whether at least one of the legacy devices is within a proximal region of the wireless communication;

when at least one of the legacy devices is within the proximal region, format a frame in a third frame format that includes:

a first portion having:

a legacy preamble; and

a signal field;

a second portion having:

an extended preamble; and

at least one additional signal field; and

a third portion that includes at least one of:

at least one service field;

an inter frame gap; and

a data field

wherein the first portion is readable by the at least one legacy device in accordance with the first frame format;

wherein the second portion is unreadable by the at least one legacy device in accordance with the first frame format;

and wherein the second portion is readable by the non-legacy devices, in accordance with the second frame format.

10. The RF transmitter of claim 9 , wherein the baseband processing module is further operably coupled to:

when the at least one of the legacy devices is not within the proximal region, format a frame in the second frame format to include:

a native preamble;

at least one signal field;

at least one service field;

an inter frame gap; and

a data field.

11. The RF transmitter of claim 10 , wherein the at least one signal field comprises at least one of:

rate/mode information;

length information;

last data unit in the frame indication;

data unit acknowledgment requirement; and

error checking capability.

12. The RF transmitter of claim 10 , wherein the baseband processing module is further operably coupled to, at least one of:

code the at least one signal field using a rate ½ convolutional code;

code the at least one signal field using an outer Reed-Solomon block code and an inner coding of the rate ½ convolutional code; and

code the at least one signal field using a rate ⅓ convolutional code with a constraint length of six.

13. The RF transmitter of claim 10 , wherein the baseband processing module is further operably coupled to, at least one of:

for a legacy channel, utilize a quadrature phase shift keying (QPSK) for the at least one signal field; and

for a wide bandwidth channel:

utilize QPSK for subcarriers of a first portion of the wide bandwidth channel, wherein the first portion has a bandwidth corresponding to the legacy channel; and

replicate the first portion for a second portion of the wide bandwidth channel.

14. The RF transmitter of claim 11 , wherein the rate/mode information comprises at least one of:

implicit number of transmit antennas;

implicit channel width; and

physical layer data rate.

15. The RF transmitter of claim 11 , wherein the length information comprises at least one of:

bytes of PSDU [PLCP (physical layer convergence procedure) Service Data Unit].

16. The RF transmitter of claim 9 , wherein the signal field comprises at least one of:

rate/mode information;

length information;

last data unit in the frame indication; and

number of antennas.

Assignments (8)