Wireless Communication Apparatus and Transmission Control Method Thereof

• US 20100167671A1
• Filed: 02/22/2008
• Published: 07/01/2010
• Est. Priority Date: 02/23/2007
• Status: Abandoned Application

• Current Assignee: Kyocera Corporation
• Original Assignee: Kyocera Corporation
• Inventors: Kawaji, Satoshi
• Application Number:
  US12/528,301
• Publication Number:
  US 20100167671A1
• Time in Patent Office: Days
• US Class Current: 455/127.500
• CPC Class Codes: H03F 1/02 Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
• CPC Class Codes: H03F 1/0277 Selecting one or more amplifiers from a plurality of amplifiers
• CPC Class Codes: H03F 2200/27 A biasing circuit node being switched in an amplifier circuit
• CPC Class Codes: H03F 2200/408 the output amplifying stage of an amplifier comprising three power stages
• CPC Class Codes: H03F 2200/451 the amplifier being a radio frequency amplifier
• CPC Class Codes: H03F 2203/21109 An input signal being distributed by switching to a plurality of paralleled power amplifiers
• CPC Class Codes: H03F 2203/21145 Output signals are combined by switching a plurality of paralleled power amplifiers to a common output
• CPC Class Codes: H03F 2203/7206 the gated amplifier being switched on or off by a switch in the bias circuit of the amplifier controlling a bias voltage in the amplifier
• CPC Class Codes: H03F 2203/7236 the gated amplifier being switched on or off by putting into parallel or not, by choosing between amplifiers by (a ) switch(es)
• CPC Class Codes: H03F 3/19 with semiconductor devices only
• CPC Class Codes: H03F 3/211 using a combination of several amplifiers H03F3/60 takes precedence
• CPC Class Codes: H03F 3/24 of transmitter output stages
• CPC Class Codes: H03F 3/72 Gated amplifiers, i.e. amplifiers which are rendered operative or inoperative by means of a control signal
• CPC Class Codes: H03G 1/0088 using discontinuously variable devices, e.g. switch-operated
• CPC Class Codes: H03G 3/3042 in modulators, frequency-changers, transmitters or power amplifiers transmission power control in bidirectional transmission systems H04W52/04
• CPC Class Codes: H04B 2001/0416 having gain or transmission power control
• CPC Class Codes: H04B 2001/045 with means for improving efficiency

Abstract

A wireless communication apparatus of the present invention is provided with at least two amplification paths (2, 3, 4; 2, 3) capable of amplifying a transmission signal and having different power consumption, a selection unit 5, 6 for selecting one of the at least two amplification paths, and a control unit 11 for controlling the selection unit 5, 6 to select one of the at least two amplification paths and the transmission signal to be amplified in the selected amplification path in accordance with operational condition of the wireless communication apparatus. Thereby, power consumption is effectively reduced in accordance with conditions.

Claims

1. A transmission control method of a wireless communication apparatus for wireless communication using an adaptive modulation scheme comprising:

an amplification path selection step for selecting one amplification path or another amplification path having less power consumption than that of the one amplification path to amplify a transmission signal in accordance with operational condition of the wireless communication apparatus when communication is performed at a communication speed lower than a predetermined value and in a predetermined low modulation class; and

a transmission signal amplification step for amplifying the transmission signal in the selected amplification path.

2. The transmission control method of the wireless communication apparatus according to claim 1, wherein the another amplification path is selected to amplify a transmission signal in the amplification path selection step when the operational condition of the wireless communication apparatus is in a power saving mode.

3. The transmission control method of the wireless communication apparatus according to 1, further comprising:

a modulation class recognizing step for recognizing whether or not the modulation class is the predetermined low modulation class or a lower modulation class when communication is performed at the communication speed lower than the predetermined value; and

a modulation class changing step for changing the modulation class at least to the predetermined low modulation class when the modulation class is over the predetermined low modulation class as a result of recognition,

wherein the amplification path selection step is executed after execution of the modulation class changing step.

4. The transmission control method of the wireless communication apparatus according to 1, wherein the one amplification path has higher linearity than that of the another amplification path.

5. The transmission control method of the wireless communication apparatus according to 1, wherein the communication at the communication speed lower than the predetermined value is voice communication.

6. A transmission control method of a wireless communication apparatus comprising:

an amplification path selection step for selecting one amplification path or another amplification path having less power consumption than that of the one amplification path to amplify a transmission signal in accordance with operational condition of the wireless communication apparatus; and

a transmission signal amplification step for amplifying the transmission signal in the selected amplification path.

7. The transmission control method of the wireless communication apparatus according to claim 6, wherein the another amplification path is selected to amplify a transmission signal in the amplification path selection step when the operational condition of the wireless communication apparatus is in a power saving mode.

8. The transmission control method of the wireless communication apparatus according to claim 6, wherein the one amplification path has higher linearity than that of the another amplification path.

9. The transmission control method of the wireless communication apparatus according to claim 7, wherein communication at a communication speed lower than a predetermined value is voice communication.

10. A wireless communication apparatus for wireless communication using an adaptive modulation scheme comprising:

at least two amplification paths having different power consumption and capable of amplifying a transmission signal;

a selection unit for selecting one of the at least two amplification paths; and

a control unit for controlling the selection unit to select one of the amplification paths and the transmission signal to be amplified in the selected amplification path in accordance with operational condition of the wireless communication apparatus when communication is performed at a communication speed lower than a predetermined value in a predetermined low modulation class.

11. A wireless communication apparatus comprising:

at least two amplification paths having different power consumption and capable of amplifying a transmission signal;

a selection unit for selecting one of the at least two amplification paths; and

a control unit for controlling the selection unit to select one of the amplification paths and the transmission signal to be amplified in the selected amplification path in accordance with operational condition of the wireless communication apparatus.