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Optimization of Automatic Gain Control for Narrow Bandwidth Operation

A technology of automatic gain control and gain change, applied in automatic gain control, the frequency difference is larger than the field, and can solve the problems of high power consumption and so on

Active Publication Date: 2021-02-09
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This conservative approach results in unnecessarily high power consumption in some circumstances

Method used

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  • Optimization of Automatic Gain Control for Narrow Bandwidth Operation
  • Optimization of Automatic Gain Control for Narrow Bandwidth Operation
  • Optimization of Automatic Gain Control for Narrow Bandwidth Operation

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0078] Assume metrics = {|f2-f1|=5MHz, normal coverage}, and historical data exists for these metrics. Therefore, thresholds are generated based on historical data, and an optimized AGC algorithm is executed.

example 2

[0080] Assume metrics = {|f2-f1|=5MHz, normal coverage} and no historical data exists for these metrics. Therefore, thresholds are generated based on the model, and the full AGC algorithm is executed.

example 3

[0082] Assume metrics = {|f2-f1|=5MHz, extended coverage} and historical data exists for these metrics. Thus, thresholds are generated based on historical data and the stored gains currently used for reception at frequency fl are applied for use at frequency f2 without performing any AGC algorithm.

[0083] Image 6 is a block diagram of an exemplary embodiment of an apparatus 600 consistent with the present invention. The apparatus includes an analog RF front end 601, as known in the art. The analog RF front end 601 includes at least one amplifier within another circuit, as shown in this example by amplifier 603 . The analog RF front end 601 is tuned to a given carrier frequency and receives a signal. The analog RF front end outputs the received analog signal to an analog-to-digital converter (ADC) 605, from which it generates the signal in digital form. The digital received signal is provided to digital baseband (BB) circuitry 607 which processes the signal to receive de...

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Abstract

The gain of an amplifier in a receiver operating in a cellular communication system is controlled by determining one or more measures of gain variability, which are then used to generate the first and second thresholds. A frequency difference between the current carrier frequency and the target carrier frequency is ascertained and then compared to a threshold. The target gain setting is generated based on the comparison: if the frequency difference is greater than a first threshold, the full AGC algorithm is executed; if the frequency difference is less than the first threshold and greater than a second threshold, the optimized AGC algorithm is executed, where the optimized The automatic gain control algorithm uses the current gain setting as a starting point; and if the frequency difference is less than both the first and second thresholds, the current gain setting is used as the target gain setting.

Description

Background technique [0001] The present invention relates to automatic gain control (AGC) in radio receivers, and more particularly to techniques for optimizing AGC in situations where only a portion of the full transmission bandwidth is received at a time. [0002] One of the most important properties of a handheld device is its battery life. For user equipment (UE) in a mobile communication system, the main power consumer is the radio. In some cases, the UE's radio circuitry can be responsible for more than 50% of the total power consumption. Therefore, minimizing the amount of time the radio needs to be active is critical to extending UE battery life. [0003] Due to the limited dynamic range of the receiver, the UE needs to adjust the gain prior to reception. The AGC algorithm responsible for this adjustment typically starts by setting up one or more amplifiers for operation at some initial gain value. The power of the received signal is then measured and the gain adju...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W52/52H04B1/12H03G3/30
CPCH03G3/3078H04B1/123H04W52/52H03G2201/702H03G2201/103
Inventor P.阿里克斯森J.阿克蒙
Owner TELEFON AB LM ERICSSON (PUBL)