CN111800169A - AGC method for near field communication PCD reception - Google Patents

AGC method for near field communication PCD reception Download PDF

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Publication number
CN111800169A
CN111800169A CN202010578712.7A CN202010578712A CN111800169A CN 111800169 A CN111800169 A CN 111800169A CN 202010578712 A CN202010578712 A CN 202010578712A CN 111800169 A CN111800169 A CN 111800169A
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CN
China
Prior art keywords
pcd
frame
rssi
reception
near field
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
CN202010578712.7A
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Chinese (zh)
Inventor
田新越
胡晨光
何济柔
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yizhao Micro Electronics Hangzhou Co Ltd
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Yizhao Micro Electronics Hangzhou Co Ltd
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Filing date
Publication date
Application filed by Yizhao Micro Electronics Hangzhou Co Ltd filed Critical Yizhao Micro Electronics Hangzhou Co Ltd
Priority to CN202010578712.7A priority Critical patent/CN111800169A/en
Publication of CN111800169A publication Critical patent/CN111800169A/en
Withdrawn legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
    • H04B5/70—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H04B17/318—Received signal strength
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
    • H04B5/70—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes
    • H04B5/77—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes for interrogation

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Circuits Of Receivers In General (AREA)

Abstract

An AGC method for near field communication (PCD) reception is provided, comprising: in the process of one-time completed card reading transaction, after the PCD side sends a Wake UP A/B frame, the PCD side receives an ATQA/ATQB frame returned by the PICC, the RSSI of a received signal is calculated at the moment, when the frame is detected to start (SOF or TR1), the RSSI calculation is started for one time, and the RSSI register is updated to report software after the frame is completed.

Description

AGC method for near field communication PCD reception
Technical Field
The invention relates to an AGC method for an ISO/IEC 14443Type A/B NFC receiver
Background
In the NFC system, the distance and the direction of a received signal of a PCD side relative to a PICC are closely related, when the parameters of the PICC are changed, the strength and the quality of the signal can obviously change, and a fixed gain system cannot adapt to the situation.
Disclosure of Invention
The NFC system specified by ISO/IEC 14443 adopts a Load Modulation method, and the PICC side adopts a Passive mode and modulates based on a field emitted by the PCD, so that the influence of space and distance is large. When the distance of PICC becomes far away or the position takes place to overturn, signal strength that PCD side coil sensed can have obvious change to influence the wholeness ability of receiver.
The invention provides an AGC method based on the method, and the dynamic adjustment of the receiving gain is realized at a small cost. The method specifically comprises the following steps: in the process of one-time completed card reading transaction, after the PCD side sends a Wake UP A/B frame, the PCD side receives an ATQA/ATQB frame returned by the PICC, the RSSI of a received signal is calculated at the moment, when the frame is detected to start (SOF or TR1), the RSSI calculation is started for one time, and the RSSI register is updated to report software after the frame is completed.
The method mainly aims at a calculation method and a strategy of the RSSI of the ISO/IEC 14443Type A/B receiving signal, and a strategy of adjusting the PGA receiving gain by software, and the card reading transaction is only subjected to one-time receiving gain adjustment after the receiving of the PCD sent by the Wake UP A/B is completed.
Drawings
Fig. 1 is a flow chart of the AGC processing method of the present invention.
Detailed Description
As shown in fig. 1, a frame is divided into four cases at the beginning. Where the red dots represent the positions where a valid start is detected (falling edge detection of subarrier) and the blue dots represent the positions where RSSI starts to be calculated. The software compares the RSSI value read back with the high and low threshold values related to the receiver signal strength, adjusts the receive gain and the threshold value related to the receiver peak detection (table lookup), and the subsequent transaction flow is performed under this condition.
Adjusting the gain of the receiving access PGA by using a software strategy to ensure that the RSSI of the signal is within a certain interval; and the adjustment of the receiving gain is only carried out once after the receiving of the PCD in the Wake UP A/B process is completed in each card reading transaction.

Claims (1)

1. An AGC method for near field communication (PCD) reception, which is characterized by comprising the following steps: in the process of one-time completed card reading transaction, after the PCD side sends a Wake UP A/B frame, the PCD side receives an ATQA/ATQB frame returned by the PICC, the RSSI of a received signal is calculated at the moment, when the frame is detected to start (SOF or TR1), the RSSI calculation is started for one time, and the RSSI register is updated to report software after the frame is completed.
CN202010578712.7A 2020-06-23 2020-06-23 AGC method for near field communication PCD reception Withdrawn CN111800169A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010578712.7A CN111800169A (en) 2020-06-23 2020-06-23 AGC method for near field communication PCD reception

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010578712.7A CN111800169A (en) 2020-06-23 2020-06-23 AGC method for near field communication PCD reception

Publications (1)

Publication Number Publication Date
CN111800169A true CN111800169A (en) 2020-10-20

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010578712.7A Withdrawn CN111800169A (en) 2020-06-23 2020-06-23 AGC method for near field communication PCD reception

Country Status (1)

Country Link
CN (1) CN111800169A (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000165272A (en) * 1998-11-27 2000-06-16 Matsushita Electric Ind Co Ltd Radio base station unit
CN1534907A (en) * 2003-03-28 2004-10-06 ��ʽ���������Ƽ� Receiver for receiving time division signal
CN101149783A (en) * 2006-07-28 2008-03-26 东芝泰格有限公司 RFID interrogator device
US8588719B1 (en) * 2012-09-17 2013-11-19 Broadcom Corporation Low power automatic gain control
CN107766764A (en) * 2017-10-30 2018-03-06 上海华虹集成电路有限责任公司 A kind of collision-proof method of 2.4G active electronic labels

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000165272A (en) * 1998-11-27 2000-06-16 Matsushita Electric Ind Co Ltd Radio base station unit
CN1534907A (en) * 2003-03-28 2004-10-06 ��ʽ���������Ƽ� Receiver for receiving time division signal
CN101149783A (en) * 2006-07-28 2008-03-26 东芝泰格有限公司 RFID interrogator device
US8588719B1 (en) * 2012-09-17 2013-11-19 Broadcom Corporation Low power automatic gain control
CN107766764A (en) * 2017-10-30 2018-03-06 上海华虹集成电路有限责任公司 A kind of collision-proof method of 2.4G active electronic labels

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Application publication date: 20201020

WW01 Invention patent application withdrawn after publication