MIMO WIRELESS COMMUNICATION GREENFIELD PREAMBLE FORMATS

1 . A communication device for multiple input multiple output wireless communication, the communication device comprises:

a baseband processing module configured to:

receive a frame via a wireless channel;

determine whether a protocol of the received frame is of a like protocol to the communication device;

determine number of transmit antennas;

when the protocol of the received frame is of the like protocol, format a preamble of a frame of the multiple input multiple output wireless communication utilizing at least one of cyclic shifting of symbols, cyclic shifting of tones, sparse tone allocation, and sparse symbol allocation based on the number of transmit antennas; and

a plurality of transmitter sections operable to transmit the preamble of the frame of the multiple input multiple output wireless communication via one or more of the transmit antennas.

2 . The communication device of claim 1 , wherein the baseband processing module is further configured to:

when the protocols of the wireless communication devices within the proximal region are not of the like protocol to the communication device, formatting the preamble of the frame of the multiple input multiple output wireless communication utilizing a legacy format for a first portion of the preamble and utilizing at least one of cyclic shifting of symbols, cyclic shifting of tones, sparse tone allocation, and sparse symbol allocation for a remaining portion of the preamble based on the number of transmit antennas.

3 . The communication device of claim 1 , where in the baseband processing module is configured to format the preamble by:

generating a carrier detect field, wherein, from transmit antenna to transmit antenna, the carrier detect field is cyclically shifted, wherein the cyclic shifting of the carrier detect field is based on a number of transmit antennas and duration of the carrier detect field;

generating a first channel sounding field, wherein, from transmit antenna to transmit antenna, the first channel sounding field is cyclically shifted, wherein the cyclic shifting of the first channel sounding field is based on the number of transmit antennas and duration of the first channel sounding field; and

generating a signal field.

4 . The communication device of claim 1 , wherein the baseband processing module is configured to format the preamble by:

generating a short training field;

generating one or more long training fields; and

generating a signal field.

5 . A communication device for multiple input multiple output wireless communication, the communication device comprises:

a baseband processing module operable to:

determine a protocol of a received frame;

determine whether the protocol of the received frame is of a like protocol of the communication device;

determine number of transmit antennas;

when the protocol of the received frame is of the like protocol, format a preamble of a frame of the multiple input multiple output wireless communication to include a short training field, one or more long training fields, and a signal field; and

a plurality of transmitter sections operable to transmit the preamble of the frame of the multiple input multiple output wireless communication via one or more of the transmit antennas.

6 . The communication device of claim 5 , wherein the baseband processing module is further operable to:

utilize at least one of cyclic shifting of symbols, cyclic shifting of tones, sparse tone allocation, and sparse symbol allocation based on the number of transmit antennas to produce at least one of: the short training field, the one or more long training fields, and the signal field.

7 . The communication device of claim 5 , wherein the baseband processing module is further operable to format the preamble by:

generating a carrier detect field, wherein, from transmit antenna to transmit antenna, the carrier detect field is cyclically shifted, wherein the cyclic shifting of the carrier detect field is based on a number of transmit antennas and duration of the carrier detect field.

8 . The communication device of claim 7 , wherein the baseband processing module is further operable to format the preamble by:

generating a first channel sounding field, wherein, from transmit antenna to transmit antenna, the first channel sounding field is cyclically shifted, wherein the cyclic shifting of the first channel sounding field is based on the number of transmit antennas and duration of the first channel sounding field.

9 . The communication device of claim 6 , wherein an amount of cyclic shifting is per each of the transmit antennae based upon the number of transmit antennae.

10 . The communication device of claim 6 , wherein the cyclic shifting is in a forward direction.

11 . The communication device of claim 6 , wherein the cyclic shifting is in a backward direction.

12 . A communication device for multiple input multiple output wireless communication, the communication device configured to:

determine a protocol of a received frame;

determine number of transmit antennas;

determine whether the protocol of the received frame is of a like protocol to the communication device;

when the protocol is of the like protocol, format a preamble of a frame of the multiple input multiple output wireless communication utilizing at least one of cyclic shifting of symbols, cyclic shifting of tones, sparse tone allocation, and sparse symbol allocation based on the number of transmit antennas; and

transmit the preamble of the frame.

13 . The communication device of claim 12 , further configured to:

when the protocols of the wireless communication devices within the proximal region are not of the like protocol, format the preamble of the frame of the wireless communication utilizing a legacy format for a first portion of the preamble and utilizing at least one of cyclic shifting of symbols, cyclic shifting of tones, sparse tone allocation, and sparse symbol allocation for a remaining portion of the preamble based on the number of transmit antennas.

14 . The communication device of claim 12 , further configured to format the preamble by:

generating a carrier detect field, wherein, from transmit antenna to transmit antenna, the carrier detect field is cyclically shifted, wherein the cyclic shifting of the carrier detect field is based on a number of transmit antennas and duration of the carrier detect field;

generating a first channel sounding field, wherein, from transmit antenna to transmit antenna, the first channel sounding field is cyclically shifted, wherein the cyclic shifting of the first channel sounding field is based on the number of transmit antennas and duration of the first channel sounding field; and

generating a signal field.

15 . The communication device of claim 12 , further configured to:

generate a short training field;

generate one or more long training fields; and

generate a signal field.

16 . The communication device of claim 12 , wherein an amount of cyclic shifting is per each of the transmit antennae based upon the number of transmit antennae.

17 . The communication device of claim 12 , wherein the cyclic shifting is in a forward direction.

18 . The communication device of claim 12 , wherein the cyclic shifting is in a backward direction.

19 . The communication device of claim 1 , wherein the cyclic shifting is in a forward direction.

20 . The communication device of claim 1 , wherein the cyclic shifting is in a backward direction.