MIMO WIRELESS COMMUNICATION GREENFIELD PREAMBLE FORMATS

• US 20100266064A1
• Filed: 07/01/2010
• Published: 10/21/2010
• Est. Priority Date: 02/13/2004
• Status: Active Grant

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: Moorti, R. Tushar, Young, Christopher, Hansen, Christopher J., Fischer, Matthew J., Trachewsky, Jason A.
• Granted Patent: US 8,351,399 B2
• Time in Patent Office: Days
• US Class Current: 375/267
• CPC Class Codes: H04L 1/0001 Systems modifying transmission characteristics according to link quality, e.g. power backoff adaptive data allocation for multicarrier modulation H04L5/0044; controlling transmission power for radio systems H04W52/04
• CPC Class Codes: H04L 1/0002 by adapting the transmission rate
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/06 using space diversity
• CPC Class Codes: H04L 1/1867 Arrangements specially adapted for the transmitter end
• CPC Class Codes: H04L 25/0226 sounding signals per se
• CPC Class Codes: H04L 25/0228 with direct estimation from sounding signals
• CPC Class Codes: H04L 27/2613 Structure of the reference signals
• CPC Class Codes: H04W 72/044 based on the type of the allocated resource
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]

Abstract

A method for multiple input multiple output wireless communication begins by determining protocols of wireless communication devices within a proximal region. The method continues by determining whether the protocols of the wireless communication devices within the proximal region are of a like protocol. The method continues by determining the number of transmit antennas. The method continues, when the protocols of the wireless communication devices within the proximal region are of the like protocol, formatting a preamble of a frame of the 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.

Claims

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

a baseband processing module operable to;

determine protocols of other wireless communication devices within a proximal region;

determine whether the protocols of the other wireless communication devices within the proximal region are of a like protocol;

determine number of transmit antennas;

when the protocols of the wireless communication devices within the proximal region are of the like protocol, format a preamble of a frame of the 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 via one or more of the transmit antennas.

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

when the protocols of the wireless communication devices within the proximal region are not of the like protocol, formatting 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.

3. The communication device of claim 1, where in the baseband processing module is 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;

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 one, where in the baseband processing module is operable 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 protocols of other wireless communication devices within a proximal region;

determine whether the protocols of the other wireless communication devices within the proximal region are of a like protocol;

determine number of transmit antennas;

when the protocols of the wireless communication devices within the proximal region are of the like protocol, format a preamble of a frame of the 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 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.