Patent ID: 8830973

Claim:
A method of transmitting a multiple input multiple output (MIMO) packet in a wireless local area network, the method comprising: generating a short training field (STF) used for at least one receiver to estimate an automatic gain control and a coarse frequency offset; generating a long training field (LTF) used for the at least one receiver to estimate a fine frequency offset; generating a Very High Throughput (VHT)-signal field; generating a VHT-STF used for improving automatic gain control estimation in a MIMO transmission; generating a VHT-LTF used for estimating a MIMO channel based on a plurality of data streams; generating a first signal field including a length field indicating a length of the plurality of data streams; generating a data frame sequentially including the STF, the LTF, the VHT-signal field, the VHT-STF, the VHT-LTF, the first signal field and the plurality of data streams; and transmitting the data frame to the at least one receiver, wherein the first signal field is subsequent to the VHT-LTF and precedes the plurality of data streams, and wherein the VHT-signal field includes first information, second information and third information, the first information indicating that the plurality of data streams in the data frame are simultaneously received by the at least one receiver, the second information indicating which receiver is targeted for the plurality of data streams, and the third information indicating a bandwidth used for a transmission of the plurality of data streams.