Patent ID: 8532213

Claim:
A method for operating a wireless multiple input multiple output (MIMO) device, the method comprising: communicating with a first communication device via a first communication link and with a second communication device via a second communication link; determining respective channel conditions of the first communication link and the second communication link; selecting a first preamble format from a plurality of preamble formats, each including a respective format of a high throughput signal field, for a first preamble of a first data frame for the first communication link based on the channel conditions of the first communication link; and selecting a second preamble format from the plurality of preamble formats for a second preamble of a second data frame for the second communication link based on the channel conditions of the second communication link; wherein the plurality of preamble formats includes a QPSK preamble format, a BPSK preamble format and a rotated BPSK preamble format, the high throughput signal field of the QPSK preamble format including one QPSK OFDM symbol, the high throughput signal field of the BPSK preamble format including two BPSK OFDM symbols, one of which is rotated by 90 degrees and the high throughput signal field of the rotated BPSK preamble format including two BPSK OFDM symbols that are both rotated by 90 degrees.