Transmission method, transmitter, and receiver for multi antenna wireless communication system
A transmitter includes first generator to generate pilot source signal by modulating pilot sequence, second generator to generate data source signal with time length longer than that of pilot source signal by modulating data sequence, first cyclic shifter to perform cyclic shift of first shift amount to pilot source signal to generate first pilot signal, second cyclic shifter to performs cyclic shift of second shift amount to data source signal to generate first data signal, third cyclic shifter to perform cyclic shift of third shift amount to pilot source signal to generate second pilot signal, fourth cyclic shifter to perform cyclic shift of fourth shift amount to data source signal to generate second data signal, first transmit antenna to transmit first pilot signal and first data signal, and second transmit antenna to transmit second pilot signal and second data signal.
1. A wireless apparatus comprising:
a generator configured to generate a first sequence, a second sequence, a first block signal, and a second block signal, the first sequence being the same as a sequence obtained by performing a first cyclic shift on a predefined sequence, an amount of the first cyclic shift being a first amount, the second sequence being the same as a sequence obtained by performing a second cyclic shift on the predefined sequence, an amount of the second cyclic shift being a second amount different from the first amount, the first block signal being the same as a signal obtained by performing a third cyclic shift on a block signal, an amount of the third cyclic shift being a third amount, the second block signal being the same as a signal obtained by performing a fourth cyclic shift on the block signal, an amount of the fourth cyclic shift being a fourth amount different from the third amount;
wherein
a period in which the first sequence and the second sequence are transmitted differs from a period in which the first block signal and the second block signal are transmitted;
a gap between the first amount and the second amount differs from a gap between the third amount and the fourth amount;
the first sequence and the first block signal are transmitted at least via a first antenna;
the second sequence and the second block signal are transmitted at least via a second antenna; and
the predefined sequence is a CAZAC sequence.
2. The apparatus according to claim 1 , further comprising:
a first transmission analog circuit coupled to the first antenna; and
a second transmission analog circuit coupled to the second antenna,
wherein
the first transmission analog circuit converts, into a first signal of a radio frequency, the first sequence and the first block signal, and outputs the first signal to the first antenna; and
the second transmission analog circuit converts, into a second signal of a radio frequency, the second sequence and the second block signal, and outputs the second signal to the second antenna.
3. The apparatus according to claim 1 , wherein the first sequence is used to estimate a first channel condition.
4. The apparatus according to claim 1 , wherein the second sequence is used to estimate a second channel condition.
5. The apparatus according to claim 1 , further comprising the first antenna and the second antenna.
6. A wireless apparatus comprising:
a receiver to receive a first sequence, a second sequence, a first block signal, and a second block signal, the first sequence being the same as a sequence obtained by performing a first cyclic shift on a predefined sequence, an amount of the first cyclic shift being a first amount, the second sequence being the same as a sequence obtained by performing a second cyclic shift on the predefined sequence, an amount of the second cyclic shift being a second amount different from the first amount, the first block signal being the same as a signal obtained by performing a third cyclic shift on a block signal, an amount of the third cyclic shift being a third amount, the second block signal being the same as a signal obtained by performing a fourth cyclic shift on the block signal, an amount of the fourth cyclic shift being a fourth amount different from the third amount,
wherein
the first sequence, the second sequence, the first block signal, and the second block signal are received via an antenna;
a period in which the first sequence and the second sequence are received differs from a period in which the first block signal and the second block signal are received;
a gap between the first amount and the second amount differs from a gap between the third amount and the fourth amount; and
the predefined sequence is a CAZAC sequence.
7. The apparatus according to claim 6 , wherein
the first sequence and the first block signal are transmitted at least via a first antenna of another wireless apparatus; and
the second sequence and the second block signal are transmitted at least via a second antenna of the another wireless apparatus.
8. The apparatus according to claim 6 , further comprising:
an analog circuit coupled to the antenna,
wherein
the analog circuit converts, into baseband signals, signals of the first sequence, the second sequence, the first block signal, and the second block signal received via the antenna, and outputs the baseband signals to the receiver.
9. The apparatus according to claim 6 , further comprising the antenna.
10. The apparatus according to claim 6 , wherein the first sequence is used to estimate a first channel condition.
11. The apparatus according to claim 6 , wherein the second sequence is used to estimate a second channel condition.
12. A transmission method for use in a wireless apparatus via a first antenna and a second antenna, comprising:
generating a first sequence, a second sequence, a first block signal, and a second block signal, the first sequence being the same as a sequence obtained by performing a first cyclic shift on a predefined sequence, an amount of the first cyclic shift being a first amount, the second sequence being the same as a sequence obtained by performing a second cyclic shift on the predefined sequence, an amount of the second cyclic shift being a second amount different from the first amount, the first block signal being the same as a signal obtained by performing a third cyclic shift on a block signal, an amount of the third cyclic shift being a third amount, the second block signal being the same as a signal obtained by performing a fourth cyclic shift on the block signal, an amount of the fourth cyclic shift being a fourth amount different from the third amount;
wherein
a period in which the first sequence and the second sequence are transmitted differs from a period in which the first block signal and the second block signal are transmitted;
a gap between the first amount and the second amount differs from a gap between the third amount and the fourth amount;
the first sequence and the first block signal are transmitted at least via the first antenna;
the second sequence and the second block Signal are transmitted at least via the second antenna; and
the predefined sequence is a CAZAC sequence.
13. The transmission method according to claim 12 , wherein the first sequence is used to estimate a first channel condition.
14. The transmission method according to claim 12 , wherein the second sequence is used to estimate a second channel condition.
15. The transmission method according to claim 12 , further comprising the first antenna and the second antenna.
16. A receiving method for use in a wireless apparatus via an antenna, comprising:
receiving a first sequence, a second sequence, a first block signal, and a second block signal, the first sequence being the same as a sequence obtained by performing a first cyclic shift on a predefined sequence, an amount of the first cyclic shift being a first amount, the second sequence being the same as a sequence obtained by performing a second cyclic shift on the predefined sequence, an amount of the second cyclic shift being a second amount different from the first amount, the first block signal being the same as a signal obtained by performing a third cyclic shift on a block signal, an amount of the third cyclic shift being a third amount, the second block signal being the same as a signal obtained by performing a fourth cyclic shift on the block signal, an amount of the fourth cyclic shift being a fourth amount different from the third amount,
wherein
the first sequence, the second sequence, the first block signal, and the second block signal are received via the antenna;
a period in which the first sequence and the second sequence are received differs from a period in which the first block signal and the second block signal are received;
a gap between the first amount and the second amount differs from a gap between the third amount and the fourth amount, and
the predefined sequence is a CAZAC sequence.