Patent ID: 8611960

Claim:
A radio apparatus comprising: a first receiving unit configured for receiving a burst signal from a transmitting apparatus, said burst signal comprising: (1) first short training field (STF) signal(s) operative in a MIMO system assigned to N of M streams wherein N<M; (2) second long training field (LTF) signals operative in the MIMO system assigned to the respective M streams, and (3) first data assigned to the N of M streams, the N of M streams including the first STF signal, the second LTF signal and the first data assigned in this respective order; said first data including a request signal from said transmitting apparatus, said request signal being configured to control said radio apparatus, said request signal including information indicative of a data rate derived from a quality of the received second LTF signal for a radio channel between the transmitting apparatus and the radio apparatus; and a second receiving unit configured to receive second data from said transmitting apparatus at said data rate.