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Near Field Communication Modulation Depth Adaptive Method and Device

A modulation depth, near-field communication technology, applied in the field of communication, to shorten the debugging time, simplify the circuit design, and speed up the research and development process.

Active Publication Date: 2017-01-25
FEITIAN TECHNOLOGIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the modulation depth will show a large difference due to the distance between the reader and the card when communicating with the card. In order to ensure that the index of the modulation depth reaches a reasonable value when the reader is communicating with the card, it is necessary to find an adaptive modulation depth method has become an urgent problem to be solved

Method used

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  • Near Field Communication Modulation Depth Adaptive Method and Device
  • Near Field Communication Modulation Depth Adaptive Method and Device
  • Near Field Communication Modulation Depth Adaptive Method and Device

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Such as figure 1 As shown, a near-field communication modulation depth adaptive method provided in this embodiment includes:

[0033] Step S1: the main control chip of the device writes the value of the first register on the non-contact chip as the first preset value, and the non-contact chip outputs the amplitude according to the value of the first register;

[0034] Specifically in this embodiment, the device includes a main control chip, a non-contact chip and a first storage area.

[0035] Preferably, the first preset value is 0x50 or 0x00.

[0036] Specifically, in this embodiment, modulation depth=the ratio of the difference between the unmodulated amplitude and the modulated amplitude to the sum of the unmodulated amplitude and the modulated amplitude, and the amplitude output in this step is the unmodulated amplitude.

[0037] Step S2: The main control chip of the device sends a measurement amplitude command to the non-contact chip, and the non-contact chip me...

Embodiment 2

[0058] Such as figure 2 As shown, a near-field communication modulation depth adaptive method provided in this embodiment is introduced by taking the application of this method on the reader as an example. The application scenario is that the reader sends data to the card. The method provided in this embodiment The operating subject of the self-adaptive method is a reader-writer, which includes a main control chip, a non-contact chip, a first storage area and an initialization module. The non-contact chip in the present embodiment preferably adopts 3911 chip, and the chip includes a first register, a second register, a third register, a fourth register and a fifth register; the method comprises the following steps:

[0059] Step 101: The reader is powered on and initialized;

[0060] This step is specifically implemented through the initialization module of the reader.

[0061] Specifically in this embodiment, the main body of the operation starting from step 102 is specifi...

Embodiment 3

[0112] Such as image 3 As shown, a near-field communication modulation depth adaptive device provided in this embodiment includes: a main control chip 1, a non-contact chip 2 and a first storage area 3;

[0113] The main control chip 1 includes a judgment module 101, a control module 102, a search module 103, an acquisition module 104, a write module 105 and an operation module 106;

[0114] The control module 102 is used to send a measurement amplitude command to the non-contact chip 2 to control the non-contact chip to measure the current amplitude value, and to control the non-contact chip 2 to output the amplitude according to the value of the first register 201, for Controlling the contactless chip 2 to output an amplitude according to the value of the second register 202 and sending data with the amplitude;

[0115] The judging module 101 is used to judge whether the value closest to the current amplitude value found by the searching module 103 is located in the bounda...

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Abstract

The invention discloses a near-field communication modulation depth adaptive method and device and relates to the field of communication. The device comprises a master control chip, a non-contact chip and a first storage zone. The master control chip can control the non-contact chip to output the modulation-free amplitude according to a value of a first register; a numerical value is acquired from a data table or through calculation and written in a second register according to the data table stored in the first storage zone in advance and the measured value of the modulation-free amplitude, the non-contact chip is controlled to output the modulated amplitude according to the value of the second register, and the modulation depth is adaptively adjusted through control over the modulated amplitude. By the adoption of the technical scheme, the modulation depth can be kept within a reasonable range and the stability of data transmission in non-contact communication is improved.

Description

technical field [0001] The present invention relates to the field of communication, in particular to a modulation depth adaptive method and device for near-field communication. Background technique [0002] With the development of short-range wireless communication technology, more and more attention has been paid to non-contact communication technology, especially in the field of mobile payment. In contactless communication, the modulation depth is an important measure of the stability of data communication. The so-called modulation depth is usually the ratio of the difference between the unmodulated amplitude and the modulated amplitude of the communication field to the sum of the unmodulated amplitude and the modulated amplitude. , expressed as a percentage. In contactless communication, the modulation method commonly used at present is the modulation method of fixed antenna impedance, that is, a contactless device such as a reader / writer outputs a fixed maximum amplitud...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B19/042
CPCH04B5/0025
Inventor 陆舟于华章
Owner FEITIAN TECHNOLOGIES
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