Transmitting and receiving method, and radio apparatus utilizing the same
A processing unit transmits, from at least one of a plurality of antennas, data corresponding respectively to the plurality of antennas. A control unit generates request signals with which to let a second radio apparatus supply information on rates at the second radio apparatus. When transmitting the request signal, the processing unit also transmits, from a plurality of antennas which includes antennas other than the antennas that transmit the data, known signals corresponding respectively to the plurality of antennas.
1. A radio apparatus, comprising:
a plurality of antennas configured for receiving a burst signal; and
a processing unit configured for processing the burst signal received by the plurality of antennas,
wherein the burst signal comprises (1) first known signal(s) operative in a MIMO system assigned to N of M streams (N<M), (2) second known signals operative in the MIMO system assigned to the respective M streams, and (3) data assigned to the N of M streams, the N of M streams including the first known signal, the second known signal, and the data in that order.
2. The radio apparatus according to claim 1 , wherein N is variable.
3. A radio apparatus, comprising:
a plurality of antennas configured for receiving a burst signal;
an automatic gain control amplifier configured for amplifying the burst signal received by the plurality of antennas; and
a processing unit configured for processing the burst signal amplified by the automatic gain control amplifier,
wherein the burst signal comprises (1) first known signal(s) operative in a MIMO system assigned to N of M streams (N<M), (2) second known signals operative in the MIMO system assigned to the respective M streams, and (3) data assigned to the N of M streams, the N of M streams including the first known signal, the second known signal, and the data in that order.
4. The radio apparatus according to claim 3 , wherein N is variable.
5. A radio apparatus, comprising:
a plurality of antennas configured for receiving an analog burst signal;
an automatic gain control amplifier configured for amplifying the analog burst signal received by the plurality of antennas;
an A-D conversion unit configured for converting the analog burst signal amplified by the automatic gain control amplifier into a digital burst signal; and
a processing unit configured for processing the digital burst signal converted by the A-D conversion unit,
wherein the analog burst signal comprises (1) first known signal(s) operative in a MIMO system assigned to N of M streams (N<M), (2) second known signals operative in the MIMO system assigned to the respective M streams, and (3) data assigned to the N of M streams, the N of M streams including the first known signal, the second known signal, and the data in that order.
6. The radio apparatus according to claim 5 , wherein N is variable.
7. A radio apparatus, comprising;
an automatic gain control amplifier configured for amplifying a burst signal; and
a processing unit configured for processing the burst signal amplified by the automatic gain control amplifier,
wherein the burst signal comprises (1) first known signal(s) operative in a MIMO system assigned to N of M streams (N<M), (2) second known signals operative in the MIMO system assigned to the respective M streams, and (3) data assigned to the N of M streams, the N of M streams including the first known signal, the second known signal, and the data in that order.
8. The radio apparatus according to claim 7 , wherein N is variable.
9. A radio apparatus, comprising:
an automatic gain control amplifier configured for amplifying an analog burst signal;
an A-D conversion unit configured for converting the analog burst signal amplified by the automatic gain control amplifier into a digital burst signal; and
a processing unit configured for processing the digital burst signal converted by the A-D conversion unit,
wherein the analog burst signal comprises (1) first known signal(s) operative in a MIMO system assigned to N of M streams (N<M), (2) second known signals operative in the MIMO system assigned to the respective M streams, and (3) data assigned to the N of M streams, the N of M streams including the first known signal, the second known signal, and the data in that order.
10. The radio apparatus according to claim 9 , wherein N is variable.