Reception method and reception apparatus
View Patent ↗A radio transmitting apparatus that has a plurality of antennas and changes the number of modulated signals transmitted simultaneously according to the propagation environment and so forth. A transmission power changing section 12 of a radio transmitting apparatus of the present invention adjusts the pilot symbol signal level so as to match the data symbol composite signal level according to the number of transmit modulated signals set by a modulated signal number setting section 11 . By this means, the operating range of received pilot symbols and the operating range of received data symbols become approximately the same on the receiving side, enabling pilot symbol quantization error to be reduced. As a result, the precision of radio wave propagation environment estimation, time synchronization, and frequency offset estimation using pilot symbols improves, and consequently data reception quality improves.
1. A wireless communications method comprising:
receiving a plurality of modulated signals from at least one antenna, with at least one modulated signal from among the plurality thereof including, in a predetermined order, a frequency offset estimation signal, a channel fluctuation estimation signal, a first gain control signal, and a second gain control signal;
controlling a gain of the at least one modulated signal based upon the first and second gain control signals;
adjusting a frequency offset of the at least one modulated signal based upon the frequency offset estimation signal;
estimating a channel fluctuation of the at least one modulated signal where the frequency offset is adjusted, based upon the channel fluctuation estimation signal;
separating the at least one modulated signal from the received plurality of modulated signals where the frequency offset is adjusted based upon the estimated channel fluctuation; and
demodulating the separated at least one modulated signal.
2. The wireless communications method according to claim 1 wherein the predetermined order comprises the first gain control signal being arranged ahead of the frequency offset estimation signal, and the second gain control signal being arranged subsequent to the frequency offset estimation signal and ahead of the channel fluctuation estimation signal.
3. The wireless communications method according to claim 1 wherein receiving the plurality of modulated signals from at least one antenna comprises receiving the plurality of modulated signals from a plurality of antennae with each modulated signal being received from a respective antenna.
4. The wireless communications method according to claim 1 , wherein the at least one modulated signal comprises an orthogonal frequency division multiplexing signal.
5. The wireless communications method according to claim 1 , wherein the frequency offset estimation signal, channel fluctuation estimation signal, first gain control signal, and second gain control signal are arranged in a preamble.
6. The wireless communications method according to claim 1 , wherein the frequency offset estimation signal, channel fluctuation estimation signal, first gain control signal, and second gain control signal are arranged in at least one pilot symbol.
7. The wireless communications method according to claim 1 , wherein the frequency offset estimation signal, channel fluctuation estimation signal, first gain control signal, and second gain control signal are arranged in at least one unique word.
8. A wireless communications method comprising:
receiving a plurality of modulated signals, with at least one modulated signal from among the plurality thereof including, in a predetermined order, a frequency offset estimation signal, a channel fluctuation estimation signal, at least one gain control signal;
controlling a gain of the at least one modulated signal based upon the at least one gain control signal;
adjusting a frequency offset of the at least one modulated signal based upon the frequency offset estimation signal;
estimating a channel fluctuation of the at least one modulated signal where the frequency offset is adjusted, based upon the channel fluctuation estimation signal;
separating the at least one modulated signal from the received plurality of modulated signals where the frequency offset is adjusted based upon the estimated channel fluctuation; and
demodulating the separated at least one modulated signal.
9. The wireless communications method according to claim 8 wherein the at least one gain control signal comprises first and second gain control signals; and wherein the predetermined order comprises the first gain control signal being arranged ahead of the frequency offset estimation signal, and the second gain control signal being arranged subsequent to the frequency offset estimation signal and ahead of the channel fluctuation estimation signal.
10. The wireless communications method according to claim 8 , wherein receiving the plurality of modulated signals comprises receiving each modulated signal from a respective antenna.
11. The wireless communications method according to claim 8 , wherein the at least one modulated signal comprises an orthogonal frequency division multiplexing signal.
12. The wireless communications method according to claim 8 , wherein the frequency offset estimation signal, channel fluctuation estimation signal, and the at least one gain control signal are arranged in a preamble.
13. The wireless communications method according to claim 8 , wherein the frequency offset estimation signal, channel fluctuation estimation signal, and the at least one gain control signal are arranged in at least one pilot symbol.
14. The wireless communications method according to claim 8 , wherein the frequency offset estimation signal, channel fluctuation estimation signal, and the at least one gain control signal are arranged in at least one unique word.
15. A wireless communications device comprising:
a receiver section configured to
receive a plurality of modulated signals, with at least one modulated signal from among the plurality thereof including, in a predetermined order, a frequency offset estimation signal, a channel fluctuation estimation signal, at least one gain control signal,
control a gain of the at least one modulated signal based upon the at least one gain control signal,
adjust a frequency offset of the at least one modulated signal based upon the frequency offset estimation signal,
estimate a channel fluctuation of the at least one modulated signal where the frequency offset is adjusted, based upon the channel fluctuation estimation signal,
separate the at least one modulated signal from the received plurality of modulated signals where the frequency offset is adjusted based upon the estimated channel fluctuation, and
demodulate the separated at least one modulated signal.
16. The wireless communications device according to claim 15 , wherein the at least one gain control signal comprises first and second gain control signals; and wherein the predetermined order comprises the first gain control signal being ahead of the frequency offset estimation signal, and the second gain control signal being subsequent to the frequency offset estimation signal and ahead of the channel fluctuation estimation signal.
17. The wireless communications device according to claim 15 , further comprising a plurality of antennas; and wherein said receiver section is configured to receive the plurality of modulated signals by receiving each modulated signal from a respective antenna of said plurality thereof.
18. The wireless communications device according to claim 15 , wherein the at least one modulated signal comprises an orthogonal frequency division multiplexing signal.
19. The wireless communications device according to claim 15 , wherein the frequency offset estimation signal, channel fluctuation estimation signal, and the at least one gain control signal are arranged in a preamble.
20. The wireless communications device according to claim 15 , wherein the frequency offset estimation signal, channel fluctuation estimation signal, and the at least one gain control signal are arranged in at least one pilot symbol.
21. The wireless communications device according to claim 15 , wherein the frequency offset estimation signal, channel fluctuation estimation signal, and the at least one gain control signal are arranged in at least one unique word.