Transmission signal generation method, transmission signal generation apparatus, reception signal generation method, and reception signal generation apparatus
Of any one of a transmission method X of transmitting modulated signal A and modulated signal B including the same data from a plurality of antennas and a transmission method Y of transmitting modulated signal A and modulated signal B having different data from the plurality of antennas, a base station apparatus does not change the transmission method during data transmission and changes only the modulation scheme. The base station apparatus transmits modulated signal A and modulated signal B to a communication terminal apparatus using the determined transmission method and modulation scheme. In this way, it is possible to improve data transmission efficiency when transmitting data using the plurality of antennas.
1. A transmission signal generation method comprising:
selecting, by a processor, either a first signal generation scheme for generating a plurality of signals including same data, or a second signal generation scheme for generating a plurality of signals including different data;
selecting a modulation scheme, for modulating the same data and the different data, among a plurality of modulation schemes; and
controlling the selecting between the first signal generation scheme and the second signal generation scheme with a longer interval than the selecting among the modulation schemes.
2. The transmission signal generation method according to claim 1 , wherein each of the plurality of signals generated using the first signal generation scheme or the second signal generation scheme is transmitted from a plurality of antennas.
3. The transmission signal generation method according to claim 1 , wherein the plurality of signals in the first signal generation scheme are generated using a space-time block coding.
4. The transmission signal generation method according to claim 1 , wherein each of the plurality of signals in the first signal generation scheme is transmitted using a Cyclic Delay Diversity (CDD) from a plurality of antennas.
5. The transmission signal generation method according to claim 1 , wherein the second signal generation scheme is selected after selecting the first signal generation scheme.
6. A transmission signal generation apparatus comprising:
a signal generation scheme selection processor structured to select either a first signal generation scheme for generating a plurality of signals including same data, and a second signal generation scheme for generating a plurality of signals including different data;
a modulation scheme selector structured to select a modulation scheme, for modulating the same data and the different data, among a plurality of modulation schemes;
a controller structured to control the selecting between the first signal generation scheme and the second signal generation scheme with a longer interval than the selecting among the modulation schemes; and
an outputter structured to output a plurality of signals generated using the selected signal generation scheme and the selected modulation scheme.
7. The transmission signal generation apparatus according to claim 6 , wherein each of the plurality of signals generated using the first signal generation scheme or the second signal generation scheme is transmitted from a plurality of antennas.
8. The transmission signal generation apparatus according to claim 6 , wherein the plurality of signals in the first signal generation scheme are generated using a space-time block coding.
9. The transmission signal generation apparatus according to claim 6 , wherein each of the plurality of signals in the first signal generation scheme is transmitted using a Cyclic Delay Diversity (CDD) from a plurality of antennas.
10. The transmission signal generation apparatus according to claim 6 , wherein the signal generation scheme selection processor selects the second signal generation scheme after selecting the first signal generation scheme.
11. A reception signal generation method comprising:
receiving a plurality of signals;
generating, by a processor, a propagation path estimation value by estimating a propagation path using an estimation symbol included in the received plurality of signals; and
decoding data included in the received plurality of signals using the propagation path estimation value, wherein:
the received plurality of signals are obtained by switching between a first plurality of signals including same data generated in one transmission signal generation apparatus and a second plurality of signals including different data generated in the one transmission signal generation apparatus; and
the first plurality of signals and the second plurality of signals are obtained by changing a modulation scheme using a shorter interval than an interval of switching between the first plurality of signals and the second plurality of signals.
12. The reception signal generation method according to claim 11 , wherein each of the plurality of signals is received via a plurality of antennas.
13. The reception signal generation method according to claim 11 , wherein the first plurality of signals are generated using a space-time block coding.
14. The reception signal generation method according to claim 11 , wherein each of the first plurality of signals is transmitted using a Cyclic Delay Diversity (CDD) from a plurality of antennas connected to the one transmission signal generation apparatus.
15. The reception signal generation method according to claim 11 , wherein the second plurality of signals are received after the first plurality of signals.
16. A reception signal generation apparatus comprising:
a receiver that receives a plurality of signals;
a propagation path estimator structured to generate a propagation path estimation value by estimating a propagation path using an estimation symbol included in the received plurality of signals; and
a decoder structured to decode data included in the received plurality of signals using the propagation path estimation value, wherein:
the received plurality of signals are obtained by switching between a first plurality of signals including same data generated in one transmission signal generation apparatus and a second plurality of signals including different data generated in the one transmission signal generation apparatus; and
the first plurality of signals and the second plurality of signals are obtained by changing a modulation scheme using a shorter interval than an interval of switching between the first plurality of signals and the second plurality of signals.
17. The reception signal generation apparatus according to claim 16 , wherein each of the plurality of signals is received via a plurality of antennas.
18. The reception signal generation apparatus according to claim 16 , wherein the first plurality of signals are generated using a space-time block coding.
19. The reception signal generation apparatus according to claim 16 , wherein each of the first plurality of signals is transmitted using a Cyclic Delay Diversity (CDD) from a plurality of antennas connected to the one transmission signal generation apparatus.
20. The reception signal generator according to claim 16 , wherein the second plurality of signals are received after the first plurality of signals.