Wireless transmission device, wireless transmission method, wireless transmission program, and wireless communication system

1. A wireless transmission device comprising:

a first interference suppression processing unit which generates an interference suppression transmission signal for partially suppressing leakage power of a signal to an interference avoidance band by frequency-domain processing for the signal in a partial frequency band of transmission signals; and

a second interference suppression processing unit which generates an interference suppression transmission signal for suppressing leakage power of a signal to the interference avoidance band by time-domain processing for the signal in a partial or entire frequency band of transmission signals,

wherein the second interference suppression processing unit performs time-domain processing on a signal among the transmission signals in a frequency band in which the first interference suppression processing unit does not perform frequency-domain processing.

2. The wireless transmission device according to claim 1 , wherein the first interference suppression processing unit performs frequency-domain processing on a signal in a frequency band close to the interference avoidance band among the transmission signals.

3. The wireless transmission device according to claim 1 , further comprising

an interference suppression processing allocation unit which decides on a range of frequency band, on which interference suppression is performed by frequency-domain processing, and a range of frequency band, on which interference suppression is performed by time-domain processing, across the frequency band of transmission signals based on interference suppression requesting information indicative of levels of interference suppression required.

4. The wireless transmission device according to claim 1 , wherein a partial band of the interference avoidance band to be targeted by the first interference suppression processing unit to suppress leakage power is near a transmission band.

5. The wireless transmission device according to claim 1 , wherein

the first interference suppression processing unit includes a leakage power suppression signal generating unit which generates a leakage power suppression signal as a signal for partially suppressing leakage power in the interference avoidance band, and

the second interference suppression processing unit includes a symbol waveform shaping unit which shapes a symbol waveform in a time domain.

6. The wireless transmission device according to claim 5 , further comprising

an operation parameter changing unit which changes an operation parameter for the first interference suppression processing unit or the second interference suppression processing unit based on interference suppression requesting information indicative of levels of interference suppression required or predetermined control information as an interference suppression processing parameter,

wherein the operation parameter changing unit changes the number of leakage power suppression signals according to the interference suppression requesting information or the predetermined control information, and notifies a destination device of the number of leakage power suppression signals after being changed.

7. The wireless transmission device according to claim 5 , further comprising

an operation parameter changing unit which changes an operation parameter for the first interference suppression processing unit or the second interference suppression processing unit based on interference suppression requesting information indicative of levels of interference suppression required or predetermined control information as an interference suppression processing parameter,

wherein the operation parameter changing unit changes a bandwidth of a partial band of the interference avoidance band to be targeted by the first interference suppression processing unit to suppress leakage power according to the interference suppression requesting information or the predetermined control information.

8. The wireless transmission device according to claim 5 , wherein the leakage power suppression signal generating unit includes:

an interference suppression symbol generating unit which inputs information on the interference avoidance band and information on a transmission symbol obtained by frequency mapping a transmission signal targeted for interference suppression by frequency-domain processing, and generating a transmission signal with an interference suppression symbol inserted therein as the transmission symbol, wherein the interference suppression symbol is a symbol for suppressing leakage power to a partial band of the interference avoidance band;

an inverse Fourier transform unit which inputs the transmission signal supplied from the interference suppression symbol generating unit, and performing inverse Fourier transform processing on the transmission signal to generate a subcarrier signal;

a parallel/serial conversion unit which inputs the subcarrier signal supplied from the inverse Fourier transform unit, converting the subcarrier signal to a serial signal, and outputting the serial signal; and

a guard interval adding unit which inputs the signal supplied from the parallel/serial conversion unit, and adding a guard interval to each transmission frame on which inverse Fourier transform was performed.

9. The wireless transmission device according to claim 1 , wherein the range of frequency band, on which interference suppression is performed by frequency-domain processing, and the range of frequency band, on which interference suppression is performed by time-domain processing, are decided in a unit of radio resource.

10. The wireless transmission device according to claim 9 , wherein the range of frequency band, on which interference suppression is performed by frequency-domain processing, and the range of frequency band, on which interference suppression is performed by time-domain processing, are decided in a unit of subcarrier.

11. A wireless transmission method comprising:

generating an interference suppression transmission signal for partially suppressing leakage power of a signal to an interference avoidance band by frequency-domain processing for the signal in a partial frequency band of transmission signals; and

generating an interference suppression transmission signal for suppressing leakage power of a signal to the interference avoidance band by time-domain processing for the signal in a partial or entire frequency band of transmission signals,

wherein the time-domain processing is performed on a signal among the transmission signals in a frequency band in which the frequency-domain processing is not performed.

12. The wireless transmission method according to claim 11 , wherein the frequency-domain processing is performed on a signal in a frequency band close to the interference avoidance band among the transmission signals.

13. The wireless transmission method according to claim 11 , further comprising

deciding on a range of frequency band, on which interference suppression is performed by frequency-domain processing, and a range of frequency band, on which interference suppression is performed by time-domain processing, across the frequency band of transmission signals based on interference suppression requesting information indicative of levels of interference suppression required.

14. A computer readable information recording medium storing a wireless transmission program which, when executed by a processor, performs a method comprising:

generating an interference suppression transmission signal for partially suppressing leakage power of a signal to an interference avoidance band by frequency-domain processing for the signal in a partial frequency band of transmission signals; and

generating an interference suppression transmission signal for suppressing leakage power of a signal to the interference avoidance band by time-domain processing for the signal in a partial or entire frequency band of transmission signals,

wherein the time-domain processing is performed on a signal among the transmission signals in a frequency band in which the frequency-domain processing is not performed.

15. The computer readable information recording medium according to claim 14 , further comprising:

frequency-domain processing on a signal in a frequency band close to the interference avoidance band among the transmission signals.

16. A wireless communication system comprising:

a wireless transmission device for transmitting a radio signal; and an amount-of-interface measurement device including a detection section for detecting the radio signal transmitted by the wireless transmission device, wherein

the amount-of-interference measurement device includes:

an amount-of-interference measurement unit which measures or estimates the amount of interference of the radio signal transmitted by the wireless transmission device with an interference avoidance band; and

a control signal notification unit which generates a control signal based on the amount of interference measured or estimated by the amount-of-interference measurement unit and notifying the wireless transmission device of the control signal, the control signal including interference suppression requesting information indicative of levels of interference suppression required or predetermined control information as an interference suppression processing parameter for frequency-domain processing of part of transmission signals and time-domain processing of part or all of transmission signals performed by the wireless transmission device as interference suppression processing, and wherein

the wireless transmission device includes:

a first interference suppression processing unit which generates an interference suppression transmission signal for partially suppressing leakage power of a signal to an interference avoidance band by frequency-domain processing for the signal in a partial frequency band of transmission signals; and

a second interference suppression processing unit which generates an interference suppression transmission signal for suppressing leakage power of a signal to the interference avoidance band by time-domain processing for the signal in a partial or entire frequency band of transmission signals,

wherein the second interference suppression processing unit performs time-domain processing on a signal among the transmission signals in a frequency band in which the first interference suppression processing unit does not perform frequency-domain processing.

17. The wireless communication system according to claim 16 , wherein the predetermined control information as the parameter for frequency-domain processing of the part of transmission signals and time-domain processing of the part or all of transmission signals performed by the wireless transmission device as interference suppression processing is at least any one of the number of radio resources to be subjected to interference suppression by frequency-domain processing among the transmission signals, a bandwidth of a partial frequency band of the interference avoidance band targeted for suppressing leakage power in the frequency-domain processing, a frequency position in the partial frequency band of the interference avoidance band targeted for suppressing leakage power in the frequency-domain processing, the number of leakage power suppression signals to be generated for suppressing leakage power in the frequency-domain processing, and an overlapping length of anterior and posterior symbols targeted for generating a symbol waveform in the time-domain processing.