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Patent Application Titled "Apparatus and Method for Controlling Power in Transmitting Device" Published Online


  2014 APR 16 (VerticalNews) -- By a News Reporter-Staff News Editor at Telecommunications Weekly -- According to news reporting originating from Washington, D.C., by VerticalNews journalists, a patent application by the inventors SONG, Seong-Wook (Gwacheon-si, KR); KIM, Joo-Han (Yongin-si, KR); CHO, Dong-Kyoon (Suwon-si, KR), filed on September 26, 2013, was made available online on April 3, 2014.

  The assignee for this patent application is Samsung Electronics Co. Ltd.

  Reporters obtained the following quote from the background information supplied by the inventors: "Typically, a transmitting device in a wireless communication system includes a power amplifier. The power amplifier may serve to transmit signals at desired strength. A transmitting device may be provided in a wireless terminal and also in a base station.

  "Power consumption of the power amplifier can occupy a large portion of the total power consumption of the transmitting device. In other words, the power consumption of the transmitting device may be directly affected by the power consumption of the power amplifier. Therefore, power control technology for the power amplifier may be an important component of the transmitting device.

  "Furthermore, the linearity of the power amplifier is an important factor for achieving an optimal Error Vector Magnitude (EVM) or Adjacent Channel Leakage Ratio (ACLR) in the wireless communication system. This is because the nonlinearity of the power amplifier may distort the output signals, causing degradation of communication performance.

  "In some such cases, a linear Radio Frequency (RF) power amplifier may use the class-A structure to match the linearity level. For example, a power amplifier equipped in a transmitting device may keep its linearity at a power level less than or equal to a compression point of 1 dB. In other words, the power amplifier equipped in the transmitting device may show its maximum efficiency at the 1 dB compression point.

  "However, it is difficult for the power amplifier to maintain linearity if the input-output voltage approaches the saturation region. For example, a power amplifier designed to maintain the linearity in a high input-output voltage region may unnecessarily consume power in a low input-output voltage region, causing a reduction in battery life of the transmitting device.

  "The above information is presented as background information only to assist with an understanding of the present disclosure. No determination has been made, and no assertion is made, as to whether any of the above might be applicable as prior art with regard to the present disclosure. Accordingly, there is a need for and improved apparatus and method for maintaining linearity of a power amplifier."

  In addition to obtaining background information on this patent application, VerticalNews editors also obtained the inventors' summary information for this patent application: "Aspects of the present disclosure are to address at least the above-mentioned problems and/or disadvantages and provide at least the advantages described below. Accordingly, an aspect of the present disclosure is to provide a power control apparatus and method for varying a bias voltage while maintaining the linearity of a power amplifier based on the input-output estimation of the power amplifier in a transmitting device for a wireless communication system.

  "Another aspect of the present disclosure is to provide an apparatus and method for controlling a bias voltage of a power amplifier by a Peak-to-Average Power Ratio (PAPR) estimated based on the communication situation in a transmitting device for a wireless communication system.

  "Another aspect of the present disclosure is to provide an apparatus and method for controlling a bias voltage of a power amplifier based on the transmission mode in a transmitting device for a wireless communication system.

  "Another aspect of the present disclosure is to provide an apparatus and method for controlling a bias voltage of a power amplifier by estimating a PAPR based on at least one of a transmission mode for signal transmission, a type of physical channel or combination of physical channels and a transfer rate in a transmitting device for a wireless communication system.

  "In accordance with an aspect of the present disclosure, a power control method for controlling a bias voltage of a power amplifier in a transmitting device having the power amplifier is provided. The power control method includes estimating a PAPR during signal transmission using basis information that is configured for communication in the transmitting device and controlling a bias voltage of the power amplifier based on the estimated PAPR.

  "In accordance with another aspect of the present disclosure, a power control apparatus for controlling a bias voltage of a power amplifier in a transmitting device having the power amplifier is provided. The power control apparatus includes a PAPR estimator configured to estimate a PAPR during signal transmission using basis information that is configured for communication in the transmitting device and a power adjuster for controlling a bias voltage of the power amplifier based on the PAPR estimated by the PAPR estimator.

  "In accordance with another aspect of the present disclosure, a power control method for controlling a bias voltage of a power amplifier in a transmitting device having the power amplifier is provided. The power control method includes controlling a bias voltage of the power amplifier using basis information that is configured for communication in the transmitting device so that a PAPR in the transmitting device may be maintained at an estimated PAPR.

  "In accordance with yet another aspect of the present disclosure, a transmitting device that includes a power amplifier for amplifying an input signal with a bias voltage and a power control apparatus for controlling a bias voltage of the power amplifier is provided. The power amplifier uses basis information that is configured for communication in the transmitting device so that a PAPR in the transmitting device may be maintained at an estimated PAPR.

  "Other aspects, advantages, and salient features of the disclosure will become apparent to those skilled in the art from the following detailed description, which, taken in conjunction with the annexed drawings, discloses various embodiments of the disclosure.

BRIEF DESCRIPTION OF THE DRAWINGS

  "The above and other aspects, features, and advantages of certain embodiments of the present disclosure will be more apparent from the following description taken in conjunction with the accompanying drawings, in which:

  "FIG. 1 illustrates an example of a structure for controlling power of a power amplifier equipped in a transmitting device for a wireless communication system according to an embodiment of the present disclosure;

  "FIG. 2 illustrates an example of a structure of a power controller, such as the power controller shown in FIG. 1, according to an embodiment of the present disclosure;

  "FIG. 3 illustrates an example of a structure of a power adjuster, such as the power adjuster shown in FIG. 2, according to an embodiment of the present disclosure;

  "FIG. 4 illustrates a control flow for adjusting a bias voltage of a power amplifier in a transmitting device for a wireless communication system according to an embodiment of the present disclosure;

  "FIG. 5 illustrates an example of a change in a collector current Ic (or Icc) due to a change in a bias voltage of a power amplifier according to an embodiment of the present disclosure; and

  "FIG. 6 illustrates an example of a change in input-output voltage of a power amplifier and in power consumption of the power amplifier due to a change in voltage applied to the power amplifier according to an embodiment of the present disclosure.

  "Throughout the drawings, like reference numerals will be understood to refer to like parts, components, and structures."

  For more information, see this patent application: SONG, Seong-Wook; KIM, Joo-Han; CHO, Dong-Kyoon. Apparatus and Method for Controlling Power in Transmitting Device. Filed September 26, 2013 and posted April 3, 2014. Patent URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&u=%2Fnetahtml%2FPTO%2Fsearch-adv.html&r=2461&p=50&f=G&l=50&d=PG01&S1=20140327.PD.&OS=PD/20140327&RS=PD/20140327

  Keywords for this news article include: Wireless Technology, Wireless Communication, Samsung Electronics Co. Ltd..

  Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC

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