Apparatus and method for compensating gain of an automatic gain controller

A technology of compensation controller and automatic gain, which is applied in the direction of gain control, improvement of control circuit for reducing distortion, amplification control, etc. Issues such as unstable signal power levels

Inactive Publication Date: 2005-12-07
SAMSUNG ELECTRONICS CO LTD
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Problems solved by technology

Demodulation performance is severely degraded if the power level of the input signal is not constant due to AGC errors caused by intermittent packet transmission
[0013] Also, during intermittent packet transmission changing the received power level in one slot, the AGC error persists until the AGC stabilizes, which significantly affects the demodulation performance of 16-QAM / 64-QAM

Method used

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  • Apparatus and method for compensating gain of an automatic gain controller
  • Apparatus and method for compensating gain of an automatic gain controller
  • Apparatus and method for compensating gain of an automatic gain controller

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Embodiment Construction

[0028] Embodiments of the present invention will be described below with reference to the accompanying drawings. It should be noted that the same reference numerals in the figures denote the same components.

[0029] In order to help develop a thorough understanding of the embodiments of the invention, numerous specific details are disclosed in the following description, such as specific signals and signal levels. It will be apparent to those skilled in the art that embodiments of the invention may be practiced without these details. Also, well-known functions or constructions are omitted for conciseness.

[0030] Embodiments of the present invention will be described in a forward link environment of a high rate packet transmission mobile communication system supporting multimedia services including voice and data services using Code Division Multiple Access (1xCDMA) bandwidth. The 1xCDMA bandwidth is a 1.25-MHz frequency bandwidth established in the existing IS-95 synchrono...

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Abstract

An apparatus and method for compensating the gain of an Automatic Gain Controller (AGC) for stabilizing the reception power of discontinuously transmitted packet data in a mobile communication system are disclosed. A compensation controller receives an AGC value from the AGC, sampling the AGC value by a predetermined sample number for a predetermined period, and obtains an AGC compensation gain by comparing a predetermined value with the difference between a sampled AGC value with a reference gain for the predetermined period. A compensator compensates the AGC value with the AGC compensation gain, thereby correcting errors generated in view of the nature of the AGC.

Description

technical field [0001] The present invention relates generally to an automatic gain control apparatus and method, and more particularly to an apparatus and method for compensating the gain of an automatic gain controller (AGC) to enable reception of high-rate packet data transmitted intermittently in a mobile communication system The signal power is stable. Background technique [0002] A mobile communication system for high-rate packet data transmission (hereinafter, referred to as a high-rate packet transmission mobile communication system) generally supports only data channels or supports both data and voice channels. The former is called International Mobile Telecommunications-2000 (IMT-2000) Evolution Data Only (1xEV-DO), while the latter is called IMT-2000 Evolution Data and Voice (1xEV-DV). [0003] In order to realize high-rate data transmission, in a high-rate packet transmission mobile communication system, multiple users share the same channel for time division m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/005H03G1/04H03G3/20H03G3/30H04B1/69H04B1/707H04J13/00
CPCH03G3/3052H03G3/3078H03G1/04H04B7/005
Inventor 安成佑许书源裵相珉
Owner SAMSUNG ELECTRONICS CO LTD
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