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CN111800169A - 一种用于近场通信pcd接收的agc方法 - Google Patents

一种用于近场通信pcd接收的agc方法 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
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Withdrawn
Application number
CN202010578712.7A
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English (en)
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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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/zh
Publication of CN111800169A publication Critical patent/CN111800169A/zh
Withdrawn legal-status Critical Current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

提供一种用于近场通信PCD接收的AGC方法，包括：在一次完成的读卡交易过程中，PCD侧发完Wake UP A/B帧后，接收到PICC返回的ATQA/ATQB帧，此时计算接收信号的RSSI，当检测到该帧开始(SOF或TR1)后，开启一次RSSI计算，完成后更新RSSI寄存器上报软件。

Description

一种用于近场通信PCD接收的AGC方法
技术领域
本发明涉及一种用于ISO/IEC 14443Type A/B NFC接收机的AGC方法
背景技术
NFC系统中，PCD侧接收到信号与PICC相对所处的距离以及方位密切相关，当PICC上述参量发生变化时，信号的强度以及质量会呈现明显的变化，而固定增益的系统无法自适应此种情况，本发明基于此提出一套AGC解决方法。
发明内容
ISO/IEC 14443规定的NFC系统中采用Load Modulation的调制方法，PICC侧采用Passive模式，基于PCD发出的场来调制，因此受空间和距离的影响较大。PICC的距离变远或者方位发生翻转时，PCD侧线圈感应到的信号强度会有明显变化，从而影响接收机的整体性能。
本发明基于此提出一种AGC方法，以很小的代价来实现接收增益的动态调整。其具体包括：在一次完成的读卡交易过程中，PCD侧发完Wake UP A/B帧后，接收到PICC返回的ATQA/ATQB帧，此时计算接收信号的RSSI，当检测到该帧开始(SOF或TR1)后，开启一次RSSI计算，完成后更新RSSI寄存器上报软件。
本发明方法主要是针对ISO/IEC 14443Type A/B接收信号RSSI的计算方法和策略，软件调整PGA接收增益的策略，读卡交易只在Wake UP A/B发送PCD接收完成后做一次接收增益调整。
附图说明
图1是本发明AGC处理方法的流程示意图。
具体实施方式
如图1所示，一帧开始分为四种情况。其中红色的圆点代表检测到有效开始的位置(Subcarrier的下降沿检测)，蓝色的圆点代表开始计算RSSI的位置。软件将读回的RSSI值与接收机信号强度相关的高低门限值比较，调整接收增益以及接收机峰值检测相关的门限值(查表)，后续交易流程在此条件下进行。
利用软件策略来调整接收通路PGA的增益，保证信号的RSSI处于一定区间内；每次读卡交易都只在Wake UP A/B流程PCD接收完成后做一次接收增益的调整。

Claims (1)

1.一种用于近场通信PCD接收的AGC方法，其特征是包括：在一次完成的读卡交易过程中，PCD侧发完Wake UP A/B帧后，接收到PICC返回的ATQA/ATQB帧，此时计算接收信号的RSSI，当检测到该帧开始(SOF或TR1)后，开启一次RSSI计算，完成后更新RSSI寄存器上报软件。
CN202010578712.7A 2020-06-23 2020-06-23 一种用于近场通信pcd接收的agc方法 Withdrawn CN111800169A (zh)

Priority Applications (1)

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CN202010578712.7A CN111800169A (zh) 2020-06-23 2020-06-23 一种用于近场通信pcd接收的agc方法

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CN202010578712.7A CN111800169A (zh) 2020-06-23 2020-06-23 一种用于近场通信pcd接收的agc方法

Publications (1)

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CN111800169A true CN111800169A (zh) 2020-10-20

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000165272A (ja) * 1998-11-27 2000-06-16 Matsushita Electric Ind Co Ltd 無線基地局装置
CN1534907A (zh) * 2003-03-28 2004-10-06 ��ʽ���������Ƽ� 接收时分信号的接收装置
CN101149783A (zh) * 2006-07-28 2008-03-26 东芝泰格有限公司 Rfid询问器设备
US8588719B1 (en) * 2012-09-17 2013-11-19 Broadcom Corporation Low power automatic gain control
CN107766764A (zh) * 2017-10-30 2018-03-06 上海华虹集成电路有限责任公司 一种2.4g有源电子标签的防碰撞方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000165272A (ja) * 1998-11-27 2000-06-16 Matsushita Electric Ind Co Ltd 無線基地局装置
CN1534907A (zh) * 2003-03-28 2004-10-06 ��ʽ���������Ƽ� 接收时分信号的接收装置
CN101149783A (zh) * 2006-07-28 2008-03-26 东芝泰格有限公司 Rfid询问器设备
US8588719B1 (en) * 2012-09-17 2013-11-19 Broadcom Corporation Low power automatic gain control
CN107766764A (zh) * 2017-10-30 2018-03-06 上海华虹集成电路有限责任公司 一种2.4g有源电子标签的防碰撞方法

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