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Calibration of a synthesiser in a radio receiver

A technology of radio receivers and synthesizers, used in wireless communication, machine-to-machine/machine-type communication services, electrical components, etc.

Pending Publication Date: 2021-04-09
NORDIC SEMICONDUCTOR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As outlined above, VCO calibration is sensitive to various factors including temperature and operating voltage, which may vary during use

Method used

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  • Calibration of a synthesiser in a radio receiver
  • Calibration of a synthesiser in a radio receiver
  • Calibration of a synthesiser in a radio receiver

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0064] Fig. 1 is a block diagram of a typical LTE eMTC receiver 100 known per se in the art. The receiver 100 includes: an antenna 102 ; a low-noise amplifier (LNA) 104 ; a frequency synthesizer 106 ; a mixer 108 ; Those skilled in the art will appreciate that this is a highly simplified overview of an actual system, typically originally containing many subsystems.

[0065] Signals received via antenna 102 pass through LNA 104 , which amplifies the received signal before inputting it to mixer 108 . The mixer 108 also takes as input the signal produced by the frequency synthesizer 106 to down-mix the received signal from the transmission frequency to a baseband frequency suitable for further processing by the demodulation module 110 .

[0066] In order to change between different radio channels, for example during a frequency hopping process, the frequency synthesizer 106 may be tuned to change the frequency of the signal it generates, said frequency being input into the mixer...

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PUM

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Abstract

A method of operating a radio receiver arranged to receive a plurality of data symbols transmitted on one of a predetermined set of frequencies. The method comprises receiving (204) a first set of data symbols at a first transmission frequency. The first set of data symbols comprises a message indicating a first frequency sub-set. A synthesiser is calibrated (208) for the one or more frequencies in the first frequency sub-set. A second set of data symbols transmitted on at least one of said one or more frequencies from the first sub-set is received (210). It is determined from the second set of data symbols whether a network quality metric exceeds a threshold (212). The synthesiser is calibrated (214) for one or more frequencies in a second frequency sub-set when the network quality metric exceeds the threshold. The second sub-set comprises frequencies that are not in the first sub-set.

Description

technical field [0001] The present invention relates to improving the efficiency with which a radio receiver can perform a calibration procedure, particularly (but not exclusively) in cellular based systems such as Long Term Evolution (LTE) systems suitable for Internet of Things applications. Background technique [0002] The range and technical capabilities of cellular-based radio communication systems have expanded enormously in recent years. Recently, the 3rd Generation Partnership Project (3 rd The Long Term Evolution (LTE) network, the fourth generation (or "4G") network standard specified by the Generation Partnership Project (3GPP), due to its relatively high uplink and downlink It has gained popularity due to road speed and larger network capacity. More precisely, LTE is the access part of the Evolved Packet System (EPS), which is a communication technology based purely on the Internet Protocol (IP), where the IP protocol carries real-time services (such as voice...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J11/00H04L5/00H04W4/70H04B1/7136H04J13/00
CPCH04B1/7136H04B2001/71365H04J11/0073H04J11/0076H04J2013/0096H04W4/70H04L67/12H04L5/0012H04L7/0331H04W72/0453
Inventor 克杰尔·奥斯曼米卡·萨尔米汤米·坎加索
Owner NORDIC SEMICONDUCTOR