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 generating unit configured for generating a burst signal that 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; and
a plurality of antennas configured for transmitting the burst signal generated by the generating unit.
2. The radio apparatus according to claim 1 , wherein N is variable.
3. A radio apparatus, comprising:
a generating unit configured for generating a burst signal that 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;
a power amplifier configured for amplifying the burst signal generated by the generating unit; and
a plurality of antennas configured for transmitting the burst signal amplified by the power amplifier.
4. The radio apparatus according to claim 3 , wherein N is variable.
5. A radio apparatus, comprising:
a generating unit configured for generating a digital burst signal that 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;
a D-A conversion unit configured for converting the digital burst signal generated by the generating unit into an analog burst signal;
a power amplifier configured for amplifying the analog burst signal converted by the D-A conversion unit; and
a plurality of antennas configured for transmitting the analog burst signal amplified by the power amplifier.
6. The radio apparatus according to claim 5 , wherein N is variable.
7. A radio apparatus, comprising;
a generating unit configured for generating a burst signal that 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; and
a power amplifier configured for amplifying the burst signal generated by the generating unit.
8. The radio apparatus according to claim 7 , wherein N is variable.
9. A radio apparatus, comprising:
a generating unit configured for generating a digital burst signal that comprises (1) first known signal(s) operative in a MIMD 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;
a D-A conversion unit configured for converting the digital burst signal generated by the generating unit into an analog burst signal; and
a power amplifier configured for amplifying the analog burst signal converted by the D-A conversion unit.
10. The radio apparatus according to claim 9 , wherein N is variable.