Transmission Power Control Apparatus, Propagation Path Estimating Apparatus, Transmission Power Control Method, and Propagation Path Estimating Method

• US 20090005101A1
• Filed: 12/26/2005
• Published: 01/01/2009
• Est. Priority Date: 12/28/2004
• Status: Active Grant

• Current Assignee: Panasonic Intellectual Property Corporation of America (Panasonic Holdings Corporation)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Nishio, Akihiko, Matsumoto, Atsushi, Futagi, Sadaki
• Granted Patent: US 8,014,807 B2
• Time in Patent Office: Days
• US Class Current: 455/522
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/04 using frequency diversity
• CPC Class Codes: H04L 1/08 by repeating transmission, e.g. Verdan system H04L1/1858 and H04L1/189 take precedence
• CPC Class Codes: H04L 27/261 Details of reference signals
• CPC Class Codes: H04L 27/2626 Arrangements specific to the transmitter only
• CPC Class Codes: H04W 52/325 Power control of control or pilot channels
• CPC Class Codes: H04W 52/42 in systems with time, space, frequency or polarisation diversity

Abstract

A transmission power control apparatus capable of reducing unnecessary transmission power that is consumed in transmission of pilot symbols. In the apparatus, a power control part (109) establishes, based on a repetition number of a data signal, a transmission power value of a pilot signal. For example, the power control part (109) establishes, based on a reception quality as improved when data signals as replicated in accordance with the repetition number of a data signal are combined, a transmission power value of a pilot signal at a level required and sufficient for meeting a target value of the reception quality of the other end of communication. A power amplifying part (110) amplifies the pilot signal in accordance with the established transmission power value.

Claims

1. A transmission power control apparatus comprising:

a setting section that sets a transmission power value for a pilot signal based on the number of repetitions of a data signal; and

an amplifying section that amplifies the pilot signal according to the transmission power value.

2. The transmission power control apparatus according to claim 1, wherein the setting section sets the transmission power value based on received quality, said received quality improving when data signals that are duplicated according to the number of repetitions are combined.

3. The transmission power control apparatus according to claim 1, wherein the setting section sets the transmission power value based on a target value for received quality of a communicating party.

4. The transmission power control apparatus according to claim 3, wherein the setting section sets the transmission power value at a level adequately satisfying the target value for received quality of a communicating party.

5. The transmission power control apparatus according to claim 1, wherein:

the setting section determines a final amplification value by correcting an amplification value for the pilot signal, said amplification value corresponding to a difference between the target value for received quality of the communicating party and a value of received quality reported from the communicating party, and increase a difference between the amplification value and the final amplification value following an increase of the number of repetitions and decreases said difference following a decrease of the number of repetitions; and

the amplifying section amplifies the pilot signal based on the final amplification value.

6. A radio transmitting apparatus comprising:

the transmission power control apparatus of claim 1;

a repetition section that duplicates a data signal according to the number of repetitions; and

a transmitting section that transmits the duplicated data signals and the amplified pilot signal.

13. The transmission power control apparatus according to claim 1, wherein:

based on the number of repetitions of a first signal, the setting section sets a transmission power value for a second signal that is different from the first signal; and

the amplifying section amplifies the second signal according to the transmission power value.

14. The transmission power control apparatus according to claim 1, wherein:

the setting section sets the transmission power value for the pilot signal based on the number of repetitions of the data signal; and

the amplifying section amplifies the pilot signal according to the transmission power value.

15. The transmission power control apparatus according to claim 3, wherein the setting section sets the transmission power value based on received quality, said received quality improving when data signals that are duplicated according to the number of repetitions are combined.

16. The transmission power control apparatus according to claim 3, wherein the setting section sets the transmission power value based on the target value for received quality of the communicating party.

17. The transmission power control apparatus according to claim 5, wherein the setting section sets the transmission power value at a level adequately satisfying the target value for received quality of the communicating party.

18. The transmission power control apparatus according to claim 3, wherein:

the setting section determines a final amplification value by correcting an amplification value for the pilot signal, said amplification value corresponding to a difference between the target value for received quality of the communicating party and a value of received quality reported from the communicating party, and increase and decreases a difference between the amplification value and the final amplification value following an increase and decrease of the number of repetitions; and

the amplifying section amplifies the pilot signal based on the final amplification value.

19. A radio transmitting apparatus comprising:

the transmission power control apparatus of claim 3;

a repetition section that duplicates a data signal according to the number of repetitions; and

a transmitting section that transmits the duplicated data signals and an amplified pilot signal.

25. The transmission power control method according to claim 13, wherein:

the setting step comprises setting, based on the number of repetitions of a first signal, a transmission power value for a second signal that is different from the first signal; and

the amplification step comprises amplifying the second signal according to the transmission power value.

26. The transmission power control method according to claim 13, wherein:

the setting step comprises setting the transmission power value for the pilot signal based on the number of repetitions of the data signal; and

the amplifying step comprises amplifying the pilot signal according the transmission power value.

7. (canceled)

8. (canceled)

20. The radio transmitting apparatus according to claim 8, further comprising a multiplexing section that time-multiplexes the duplicated data signals and the amplified pilot signal in a radio frame,

wherein the transmitting section transmits the data signals and the pilot signal multiplexed in the radio frame.

9. (canceled)

10. (canceled)

22. The transmission channel estimation apparatus according to claim 10, further comprising a correction section that determines a final amplification value by correcting an amplification value for the pilot signal, said amplification value corresponding to a difference between the target value of received quality and a measured value of received quality, and increases and decreases a difference between the amplification value and the final amplification value following an increase and decrease of the number of repetitions,

wherein the attenuation section attenuates the amplified pilot signal according to the final amplification value.

23. A radio receiving apparatus comprising:

the transmission channel estimation apparatus of claim 10;

a receiving section that receives data signals duplicated according to the number of repetitions and an amplified pilot signal;

a compensation section that performs transmission channel compensation on the data signals based on the transmission channel estimation result; and

a demodulation section that demodulates the data signals subjected to transmission channel compensation.

11. (canceled)

12. A transmission power control apparatus comprising:

a setting section that sets a transmission power value based on the number of repetitions; and

an amplifying section that amplifies a signal according to the transmission power value.

21. A transmission channel estimation apparatus comprising:

an attenuation section that attenuates a pilot signal amplified according to a transmission power value set based on the number of repetitions of a data signal; and

an execution section that executes transmission channel estimation using the attenuated pilot signal.

24. A transmission power control method comprising the steps of:

setting a transmission power value based on the number of repetitions; and

amplifying a signal according to the transmission power value.

27. A transmission channel estimation method comprising the steps of:

attenuating a pilot signal amplified according to a transmission power value, said transmission power value being set based on the number of repetitions of a data signal; and

executing transmission channel estimation using the attenuated pilot signal.