Transmitter for communications system
View Patent ↗An rf signal transmitter for transmitting rf signals through a plurality of antennas is described, which comprises: a transmit section adapted to selectively set, with respect to an input signal, the initial phase of an output to at least one of said antennas depending on a time or frequency region used for communication and to provide delay to the output on an antenna-by-antenna basis and on the basis of a transmission timing or a transmission frequency; and a quality information receive section for receiving quality information from destination station, i.e., a wireless terminal unit, said quality information concerning the rf signal transmitted from said transmit section and received at said destination station.
1. A transmission control method for transmitting data to be transmitted through a plurality of antennas using regions defined by frequency and time axes, comprising:
providing the data to be transmitted with a delay that is constant along a portion of the frequency axis and different for each output of the antennas according to cyclic delay diversity; and
providing the data to be transmitted with an initial phase that is variable along the portion of the frequency axis from one of a plurality of initial phases for each of the regions such that the initial phase of each of the regions is different from the initial phase of at least one of neighboring regions, the neighboring regions of each region being each of the regions adjacent thereto,
wherein said delay and said initial phase are provided together.
2. The transmission control method according to claim 1 , wherein the initial phase provided for each of the regions is changed in the time axis and/or the frequency axis.
3. The transmission control method according to claim 1 , wherein the initial phase provided for each of the regions is regularly changed.
4. The transmission control method according to claim 2 , wherein the initial phase provided for each of the regions is regularly changed.
5. The transmission control method according to claim 1 , wherein the initial phase provided for each of the regions is cyclically changed.
6. The transmission control method according to claim 2 , wherein the initial phase provided for each of the regions is cyclically changed.
7. The transmission control method according to claim 3 , wherein the initial phase provided for each of the regions is cyclically changed.
8. The transmission control method according to claim 4 , wherein the initial phase provided for each of the regions is cyclically changed.
9. The transmission control method according to claim 1 , wherein a phase difference between two initial phases is π.
10. The transmission control method according to claim 2 , wherein a phase difference between two initial phases is π.
11. The transmission control method according to claim 3 , wherein a phase difference between two initial phases is π.
12. The transmission control method according to claim 4 , wherein a phase difference between two initial phases is π.
13. The transmission control method according to claim 5 , wherein a phase difference between two initial phases is π.
14. The transmission control method according to claim 6 , wherein a phase difference between two initial phases is π.
15. The transmission control method according to claim 7 , wherein a phase difference between two initial phases is π.
16. The transmission control method according to claim 8 , wherein a phase difference between two initial phases is π.
17. A transmitter comprising:
a transmit section which transmits data to be transmitted through a plurality of antennas using regions defined by frequency and time axes by,
providing the data to be transmitted with a delay that is constant along a portion of the frequency axis and different for each output of the antennas according to cyclic delay diversity; and
providing the data to be transmitted with an initial phase that is variable along the portion of the frequency axis from one of a plurality of initial phases for each of the regions such that the initial phase of each of the regions is different from the initial phase of at least one of the neighboring regions, the neighboring regions of each region being each of the regions adjacent thereto,
wherein said delay and said initial phase are provided together.
18. The transmitter according to claim 17 , wherein the initial phase provided for each of the regions is changed in the time axis and/or the frequency axis.
19. The transmitter according to claim 17 , wherein the initial phase provided for each of the regions is regularly changed.
20. The transmitter according to claim 18 , wherein the initial phase provided for each of the regions is regularly changed.
21. The transmitter according to claim 17 , wherein the initial phase provided for each of the regions is cyclically changed.
22. The transmitter according to claim 18 , wherein the initial phase provided for each of the regions is cyclically changed.
23. The transmitter according to claim 19 , wherein the initial phase provided for each of the regions is cyclically changed.
24. The transmitter according to claim 20 , wherein the initial phase provided for each of the regions is cyclically changed.
25. The transmitter according to claim 17 , wherein a phase difference between two initial phases is π.
26. The transmitter according to claim 18 , wherein a phase difference between two initial phases is π.
27. The transmitter according to claim 19 , wherein a phase difference between two initial phases is π.
28. The transmitter according to claim 20 , wherein a phase difference between two initial phases is π.
29. The transmitter according to claim 21 , wherein a phase difference between two initial phases is π.
30. The transmitter according to claim 22 , wherein a phase difference between two initial phases is π.
31. The transmitter according to claim 23 , wherein a phase difference between two initial phases is π.
32. The transmitter according to claim 24 , wherein a phase difference between two initial phases is π.
33. A base station comprising:
a transmit section which transmits data to be transmitted through a plurality of antennas using regions defined by frequency and time axes by,
providing the data to be transmitted with a delay that is constant along a portion of the frequency axis and different for each output of the antennas according to cyclic delay diversity; and
providing the data to be transmitted with an initial phase that is variable along the portion of the frequency axis from one of the plurality of initial phases for each of the regions such that the initial phase of each of the regions is different from the initial phase of at least one of neighboring regions, the neighboring regions of each region being each of the regions adjacent thereto,
wherein said delay and said initial phase are provided together.
34. The base station according to claim 33 , wherein the initial phase provided for each of the regions is changed in the time axis and/or the frequency axis.
35. The base station according to claim 33 , wherein the initial phase provided for each of the regions is regularly changed.
36. The base station according to claim 34 , wherein the initial phase provided for each of the regions is regularly changed.
37. The base station according to claim 33 , wherein the initial phase provided for each of the regions is cyclically changed.
38. The base station according to claim 34 , wherein the initial phase provided for each of the regions is cyclically changed.
39. The base station according to claim 35 , wherein the initial phase provided for each of the regions is cyclically changed.
40. The base station according to claim 36 , wherein the initial phase provided for each of the regions is cyclically changed.
41. The base station according to claim 33 , wherein a phase difference between two initial phases is π.
42. The base station according to claim 34 , wherein a phase difference between two initial phases is π.
43. The base station according to claim 35 , wherein a phase difference between two initial phases is π.
44. The base station according to claim 36 , wherein a phase difference between two initial phases is π.
45. The base station according to claim 37 , wherein a phase difference between two initial phases is π.
46. The base station according to claim 38 , wherein a phase difference between two initial phase is π.
47. The base station according to claim 39 , wherein a phase difference between two initial phases is π.
48. The base station according to claim 40 , wherein a phase difference between two initial phases is π.
49. A communication system, comprising:
a terminal unit; and
a base station including a transmit section which transmits data to be transmitted through a plurality of antennas using regions defined by frequency and time axes by,
providing the data to be transmitted with a delay that is constant along a portion of the frequency axis and different for each output of the antennas according to cyclic delay diversity; and
providing the data to be transmitted with an initial phase that is variable along the portion of the frequency axis from one of a plurality of initial phases for each of the regions such that the initial phase of each of the regions is different from the initial phase of at least one of neighboring regions, the neighboring regions of each region being each of the regions adjacent thereto,
wherein said delay and said initial phase are provided together.
50. The communication system according to claim 49 , wherein the initial phase provided for each of the regions is changed in the time axis and/or the frequency axis.
51. The communication system according to claim 49 , wherein the initial phase provided for each of the regions is regularly changed.
52. The communication system according to claim 50 , wherein the initial phase provided for each of the regions is regularly changed.
53. The communication system according to claim 49 , wherein the initial phase provided for each of the regions is cyclically changed.
54. The communication system according to claim 50 , wherein the initial phase provided for each of the regions is cyclically changed.
55. The communication system according to claim 51 , wherein the initial phase provided for each of the regions is cyclically changed.
56. The communication system according to claim 52 , wherein the initial phase provided for each of the regions is cyclically changed.
57. The communication system according to claim 49 , wherein a phase difference between two initial phases is π.
58. The communication system according to claim 50 , wherein a phase difference between two initial phases is π.
59. The communication system according to claim 51 , wherein a phase difference between two initial phases is π.
60. The communication system according to claim 52 , wherein a phase difference between two initial phases is π.
61. The communication system according to claim 53 , wherein a phase difference between two initial phases is π.
62. The communication system according to claim 54 , wherein a phase difference between two initial phases is π.
63. The communication system according to claim 55 , wherein a phase difference between two initial phases is π.
64. The communication system according to claim 56 , wherein a phase difference between two initial phases is π.