Transmission power control apparatus, propagation path estimating apparatus, transmission power control method, and propagation path estimating method

• US 8,014,807 B2
• Filed: 12/26/2005
• Issued: 09/06/2011
• Est. Priority Date: 12/28/2004
• Status: Active Grant

• Current Assignee: Panasonic Intellectual Property Corporation of America (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: Nishio, Akihiko, Matsumoto, Atsushi, Futagi, Sadaki
• Primary Examiner(s): Ghebetinsae; Temesghen
• Assistant Examiner(s): Aminzay; Shaima Q
• Application Number:
  US11/722,859
• Publication Number:
  US 20090005101A1
• Time in Patent Office: 2,080 Days
• Field of Search: 370/344, 370/278, 370/282, 370/318, 370/319, 370/335, 370/342, 370/340, 455/522, 455/69, 455/13.4, 455/127.1, 455/127.5, 455/127.3, 455/115.3, 455/232.1, 713/320, 375/295, 375/316, 375/296, 330/2
• 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 establishes, based on a repetition number of a data signal, a transmission power value of a pilot signal. For example, the power control part establishes, based on an improved reception quality 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 amplifies the pilot signal in accordance with the established transmission power value.

Claims

1. A transmission apparatus comprising:

a setting section that sets a first amplification value by subtracting a reception quality value reported from a receiving side from a target reception value of a pilot signal used for transmission channel estimation, sets an attenuation value which is set to be larger when a number of repetitions of a data signal increases, and sets a second amplification value by subtracting the attenuation value from the first amplification value;

an amplification section that amplifies power of the pilot signal according to the second amplification value; and

a transmission section that transmits the pilot signal with the amplified power.

2. A reception apparatus comprising:

a reception section that receives a pilot signal and a data signal;

a setting section that sets a first attenuation value by subtracting a reception quality value of the received pilot signal from a target reception value of the pilot signal, sets an amplification value which is set to be larger when a number of repetitions of the received data signal increases, and sets a second attenuation value by subtracting the amplification value from the first attenuation value;

an attenuation section that attenuates power of the received pilot signal according to the second attenuation value; and

a transmission channel estimation section that executes transmission channel estimation using the pilot signal with attenuated power.

3. A transmission power control method comprising:

setting a first amplification value by subtracting a reception quality value reported from a receiving side from a target reception value of a pilot signal used for transmission channel estimation;

setting an attenuation value which is set to be larger when a number of repetitions of a data signal increases;

setting a second amplification value by subtracting the attenuation value from the first amplification value; and

amplifying power of the pilot signal according to the second amplification value.

4. A transmission channel estimation method comprising:

receiving a pilot signal and a data signal;

setting a first attenuation value by subtracting a reception quality value of the received pilot signal from a target reception value of the pilot signal;

setting an amplification value which is set to be larger when a number of repetitions of the received data signal increases;

setting a second attenuation value by subtracting the amplification value from the first attenuation value;

attenuating power of the received pilot signal according to the second attenuation value; and

executing transmission channel estimation using the pilot signal with attenuated power.