Radio transmission device
View Patent ↗To obtain maximum throughput in accordance with characteristics of a propagation path, a radio transmission device having a plurality of transmitting antennas ( 18 a, 18 b ) for transmitting a transmission signal in units of sub-carriers by performing spatial multiplexing or without performing spatial multiplexing is provided that includes a sub-carrier modulation part 11 modulating the input transmission signal for each sub-carrier, a transmission signal allocation part 13 allocating the transmission signal modulated for each of the sub-carriers to each of the transmitting antennas, and a transmission control part 12 that determines a multiplexing number for performing spatial multiplexing for each sub-carrier based on information received from another radio communication device as an opposite party, and outputs the determined multiplexing number to the sub-carrier modulation part and the transmission signal allocation part.
1. A radio transmitter having a plurality of transmitting antennas, the radio transmitter comprising:
a determination part determining a spatial multiplexing number corresponding to each of a plurality of blocks when transmitting a transmission signal blocked in time and frequency to a radio communication device as an opposite party; and
a transmission signal allocation part allocating a transmission signal to each of said transmitting antennas based on said determined spatial multiplexing number, wherein
more than one transmission signal block is allocated to said radio communication device.
2. The radio transmitter according to claim 1 , wherein
information about the spatial multiplexing number corresponding to each of said plurality of blocks is received from said radio communication device.
3. The radio transmitter according to claim 1 or claim 2 , wherein
said transmission signal is composed of continuous symbols, and
when said spatial multiplexing number is two, said symbols are allocated to two transmitting antennas for each of said symbols according to the order of said continuous symbols.
4. The radio transmitter according to claim 1 or claim 2 , wherein
said transmission signal is composed of continuous symbols, and
when said spatial multiplexing number is three, said symbols are allocated to three transmitting antennas for each of said symbols according to the order of said continuous symbols.
5. The radio transmitter according to claim 1 or claim 2 , wherein
said transmission signal is composed of continuous symbols, and
when said spatial multiplexing number is two or more, said symbols are allocated to each transmitting antenna for each of said symbols according to the order of said continuous symbols.
6. A radio communication device having a plurality of receiving antennas and receiving a signal transmitted from the radio transmitter according to any of claim 1 or claim 2 , wherein
information about the spatial multiplexing number is transmitted from said radio communication device.
7. A radio communication device having a plurality of receiving antennas and receiving a signal transmitted from the radio transmitter according to any of claim 1 or claim 2 , wherein
among said received signals for each block, MIMO processing is performed on a signal that is spatial multiplexed and diversity processing is performed on a signal not spatial multiplexed.
8. A radio transmission method of a radio transmitter having a plurality of transmitting antennas, the method comprising:
determining a spatial multiplexing number corresponding to each of a plurality of blocks when transmitting a transmission signal blocked in time and frequency to a radio communication device as an opposite party;
allocating a transmission signal to each of said transmitting antennas based on said determined spatial multiplexing number; and
allocating at least two of said transmission signal blocks to said radio communication device.
9. The radio transmission method according to claim 8 , further comprising:
receiving information about the spatial multiplexing number from said radio communication device.
10. A radio transmission method of a radio communication device having a plurality of receiving antennas, the method comprising:
receiving a signal transmitted by the radio transmission method according to claim 8 or claim 9 , and
transmitting information about the spatial multiplexing number.
11. A radio communication system comprising:
a radio transmitter having a plurality of transmitting antennas; and
a radio communication device as an opposite party of said radio transmitter, wherein
said radio transmitter determines a spatial multiplexing number corresponding to each of a plurality of blocks and allocates a transmission signal, blocked in time and frequency, to each of said transmitting antennas based on said determined spatial multiplexing number when transmitting a transmission signal blocked in time and frequency to said radio communication device as an opposite party,
at least two blocks of the transmission signal are allocated to said radio communication device, and
said radio communication device receives a signal, including said allocated transmission signal blocks, transmitted from said radio transmitter.
12. A radio communication system comprising:
a radio transmitter having a plurality of transmitting antennas: and
a radio communication device as an opposite party of said radio transmitter, wherein
said radio communication device transmits to said radio transmitter information about a spatial multiplexing number corresponding to each block of a plurality of transmission blocks blocked in time and frequency to said radio transmitter,
said radio transmitter determines the spatial multiplexing number based on received said information about the spatial multiplexing number corresponding to each block of said plurality of blocks, allocates a transmission signal to each of said transmitting antennas based on said determined spatial multiplexing number, and allocates at least two of said blocks to said radio communication device.