Signal generating method and signal generating device
A transmission method of simultaneously transmitting a first modulated signal and a second modulated signal at a common frequency performs precoding on both signals using a fixed precoding matrix and regularly changes the phase of at least one of the signals. One of signal generation processing in which phase change is performed and signal generation processing in which phase change is not performed is selectable, thereby improving general versatility in signal generation.
1. A transmission apparatus comprising:
encoding circuitry configured to encode data to generate encoded data blocks;
dividing circuitry configured to divide the encoded data blocks into first to M-th data sequences, where M is an integer greater than 1;
mapping circuitry configured to modulate the first to M-th data sequences, to generate first to M-th modulated symbol sequences;
precoding circuitry configured to precode the first to M-th modulated symbol sequences according to a determined precoding matrix, to generate first to M-th precoded modulated symbol sequences;
phase hop circuitry configured to perform phase hopping on at least one of the first to M-th precoded modulated symbol sequences for each set of symbols according to a phase hopping matrix, to generate first to M-th phase-hopped precoded modulated symbol sequences, the phase hopping matrix having a phase rotation amount selected from among a predetermined number of candidates such that the phase rotation amount changes when the phase hopping is performed on a next set of symbols, the predetermined number of candidates including an initial value for the phase hopping that is equal to zero; and
transmission circuitry configured to transmit first to M-th transmission signals generated based on the respective first to M-th phase-hopped precoded modulated symbol sequences, at a same frequency range and at a same transmission time from first to M-th antennas, respectively.
2. The transmission apparatus according to claim 1 ,
wherein M is equal to 2 and
wherein the mapping circuitry is configured to modulate the first data sequence and the second data sequence according to a Quadrature Phase Shift Keying (QPSK) scheme and a 16 Quadrature Amplitude Modulation (16QAM) scheme, respectively.
3. The transmission apparatus according to claim 1 , wherein the phase rotation amount for a next set of symbols is selected so as to increase in a positive direction.
4. The transmission apparatus according to claim 1 , wherein the initial value is used with respect to a lead symbol of each data block among the first to M-th precoded modulated symbol sequences.
5. A reception apparatus comprising:
reception circuitry configured to receive signals including first to M-th transmission signals, where M is an integer greater than 1;
demodulation circuitry configured to demodulate the received signals to generate encoded data blocks;
decoding circuitry configured to decode the encoded data blocks, wherein
the first to M-th transmission signals are generated by a transmission apparatus performing the following procedures of:
encoding data to generate the encoded data blocks;
dividing the encoded data blocks into first to M-th data sequences;
modulating the first to M-th data sequences, to generate first to M-th modulated symbol sequences;
precoding the first to M-th modulated symbol sequences according to a determined precoding matrix, to generate first to M-th precoded modulated symbol sequences;
performing phase hopping on at least one of the first to M-th precoded modulated symbol sequences for each set of symbols according to a phase hopping matrix, to generate first to M-th phase-hopped precoded modulated symbol sequences, the phase hopping matrix having a phase rotation amount selected from among a predetermined number of candidates such that the phase rotation amount changes when the phase hopping is performed on a next set of symbols, the predetermined number of candidates including an initial value for the phase hoping that is equal to zero; and
transmitting the first to M-th transmission signals generated based on the respective first to M-th phase-hopped precoded modulated symbol sequences, at a same frequency range and at a same transmission time from first to M-th antennas, respectively.
6. The reception apparatus according to claim 5 ,
wherein M is equal to 2 and
wherein the demodulation circuitry is configured to demodulate the first transmission signals and the second transmission signals according to a Quadrature Phase Shift Keying (QPSK) scheme and a 16 Quadrature Amplitude Modulation (16QAM) scheme, respectively.
7. The reception apparatus according to claim 5 , wherein the phase rotation amount for a next set of symbols is selected so as to increase in a positive direction.
8. The reception apparatus according to claim 5 , wherein the initial value is used with respect to a lead symbol of each data block among the first to M-th precoded modulated symbol sequences.
9. A transmission method comprising:
encoding encode data to generate encoded data blocks;
dividing the encoded data blocks into first to M-th data sequences, where M is an integer greater than 1;
modulating the first to M-th data sequences, to generate first to M-th modulated symbol sequences;
precoding the first to M-th modulated symbol sequences according to a determined precoding matrix, to generate first to M-th precoded modulated symbol sequences;
performing phase hopping on at least one of the first to M-th precoded modulated symbol sequences for each set of symbols according to a phase hopping matrix, to generate first to M-th phase-hopped precoded modulated symbol sequences, the phase hopping matrix having a phase rotation amount selected from among a predetermined number of candidates such that the phase rotation amount changes when the phase hopping is performed on a next set of symbols, the predetermined number of candidates including an initial value for the phase hopping that is equal to zero; and
transmitting first to M-th transmission signals generated based on the respective first to M-th phase-hopped precoded modulated symbol sequences, at a same frequency range and at a same transmission time from first to M-th antennas, respectively.
10. The transmission method according to claim 9 ,
wherein M is equal to 2 and
wherein the modulating modulates the first data sequence and the second data sequence according to a Quadrature Phase Shift Keying (QPSK) scheme and a 16 Quadrature Amplitude Modulation (16QAM) scheme, respectively.
11. The transmission method according to claim 9 , wherein the phase rotation amount for a next set of symbols is selected so as to increase in a positive direction.
12. The transmission method according to claim 9 , wherein the initial value is used with respect to a lead symbol of each data block among the first to M-th precoded modulated symbol sequences.
13. A reception method comprising:
receiving signals including first to M-th transmission signals, where M is an integer greater than 1;
demodulating the received signals to generate encoded data blocks;
decoding the encoded data blocks, wherein
the first to M-th transmission signals are generated by a transmission apparatus performing the following procedures of:
encoding data to generate the encoded data blocks;
dividing the encoded data blocks into first to M-th data sequences;
modulating the first to M-th data sequences, to generate first to M-th modulated symbol sequences;
precoding the first to M-th modulated symbol sequences according to a determined precoding matrix, to generate first to M-th precoded modulated symbol sequences;
performing phase hopping on at least one of the first to M-th precoded modulated symbol sequences for each set of symbols according to a phase hopping matrix, to generate first to M-th phase-hopped precoded modulated symbol sequences, the phase hopping matrix having a phase rotation amount selected from among a predetermined number of candidates such that the phase rotation amount changes when the phase hopping is performed on a next set of symbols, the predetermined number of candidates including an initial value for the phase hopping that is equal to zero; and
transmitting the first to M-th transmission signals generated based on the respective first to M-th phase-hopped precoded modulated symbol sequences, at a same frequency range and at a same transmission time from first to M-th antennas, respectively.
14. The reception method according to claim 13 ,
wherein M is equal to 2 and
wherein the demodulating demodulates the first transmission signals and the second transmission signals according to a Quadrature Phase Shift Keying (QPSK) scheme and a 16 Quadrature Amplitude Modulation (16QAM) scheme, respectively.
15. The reception method according to claim 13 , wherein the phase rotation amount for a next set of symbols is selected so as to increase in a positive direction.
16. The reception method according to claim 13 , wherein the initial value is used with respect to a lead symbol of each data block among the first to M-th precoded modulated symbol sequences.