CN102957649B - subcarrier modulation method - Google Patents
subcarrier modulation method Download PDFInfo
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- CN102957649B CN102957649B CN201110254460.3A CN201110254460A CN102957649B CN 102957649 B CN102957649 B CN 102957649B CN 201110254460 A CN201110254460 A CN 201110254460A CN 102957649 B CN102957649 B CN 102957649B
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- subcarrier
- frequency
- modulation
- phase
- ssb
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 230000005540 biological transmission Effects 0.000 claims description 9
- 238000004891 communication Methods 0.000 abstract description 9
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 239000002184 metal Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- -1 batteries Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
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Abstract
Subcarrier modulation method in radio-frequency technique, it has capacity usage ratio maximized single-side belt pattern (SSB), reduces subcarrier and launch energy consumption, it is provided that usefulness, increase communication distance.It is applicable to ISO/IEC 14443, ISO/IEC 15693, ISO/IEC 18092 standard.
Description
Technical field
The present invention relates to subcarrier modulation method, especially the subcarrier modulation method under 13.56MHz frequency.
Background technology
At present, ISO/IEC14443, ISO/IEC15693, ISO/IEC18092 standard under known 13.56MHz frequency uses
Subcarrier modulation method be load modulation, modulated signal is square wave, effective energy be less than 60%；Load can not be excessive simultaneously,
Otherwise when subcarrier sends, energy expenditure is excessive, and sender causes owing to energy is not enough resetting, and then communication disruption；Simultaneously
Subcarrier signal amplitude is low, and communication distance is near, if running into metal object again, communication distance closer to.Such as in mobile phone mobile payment
In application, owing to being affected by metals such as batteries, communication distance is close, poor effect.
In order to overcome the deficiency that existing subcarrier modulation method efficiency is low, energy consumption is big, communication distance is near, the present invention provides a kind of secondary
Carrier modulating method, the method can not only improve effective energy, and can reduce subcarrier and send energy, thus improve communication away from
From.
The invention has the beneficial effects as follows, reduce subcarrier and launch energy consumption, improve usefulness, increase communication distance.
Summary of the invention
Use energy signal than maximized SSB (single-side belt) modulator approach:
1. the frequency of subcarrier sent be carrier frequency with the frequency of subcarrier and or poor, represent the unlatching of subcarrier during transmission,
The closedown of subcarrier is represented when not sending；Phase-modulation can use the PSK of SSB to modulate, when phase-modulation is 180 degree also
Can be by the method for lower sideband switching.
2. when the frequency of the subcarrier sent is carrier frequency, the positive of the subcarrier carrier wave of transmission and anti-phase changing method,
The method that can also send carrier wave with switch, the frequency that frequency is subcarrier switching or switch, switch or the phase place that switchs and
The phase place of subcarrier is identical.
Detailed description of the invention
Whole realization principle:
1. read-write equipment provides radio-frequency (RF) energy, sends a command to be operated equipment, is sent an acknowledgement to read-write equipment by operation equipment,
Now it is not provided that energy by operation equipment, modulating subcarrier can only be sent.
2. read-write equipment provides radio-frequency (RF) energy, sends a command to be operated equipment, is sent an acknowledgement to read-write equipment by operation equipment,
Now provided radio-frequency (RF) energy by operation equipment, and send modulating subcarrier
The most general modulating mode: carrier wave adds that modulated signal, load modulation add variable load exactly in radio-frequency field.Secondary
Carrier wave is use side's wave modulation, therefore can produce a lot of harmonic waves, but useful signal is fundamental signal.
According to whole realization principle, restriction (as a example by mobile phone mobile payment) in actual applications:
1. the battery of mobile phone contains metal, and this metal have impact on the transmission of radio frequency, and radiofrequency signal and energy are had decay.Do not having
Under conditions of external antenna read-write equipment existing accept cannot to receive under sensitivity believed by the response of operation equipment
Number；Also the order of read-write card equipment cannot be correctly identified equally by operation equipment.
2. the battery capacity of mobile phone is limited, under present normalized current restrictive condition, launches by standard signal, transmitting
Radiofrequency signal cannot compensate as do not have battery stop under the conditions of normal communication signal intensity.
Concrete settling mode
For the restriction in actual applications of whole realization principle, propose concrete settling mode SSB (single-side belt) and solve
Method: in order to meet the existing mobile phone power consumption requirements to SIM, this programme proposes maximum transmission energy than scheme SSB
Pattern, uses SSB modulating mode to realize subcarrier and modulates:
1. the frequency of subcarrier sent be carrier frequency with the frequency of subcarrier and or poor, represent the unlatching of subcarrier during transmission,
The closedown of subcarrier is represented when not sending；Phase-modulation can use the PSK of SSB to modulate, when phase-modulation is 180 degree also
Can be by the method for lower sideband switching.
2. when the frequency of the subcarrier sent is carrier frequency, the positive of the subcarrier carrier wave of transmission and anti-phase changing method,
The method that can also send carrier wave with switch, the frequency that frequency is subcarrier switching or switching, the phase switching or switching
Position is identical with the phase place of subcarrier.
Claims (2)
1. subcarrier modulation method, in radio frequency applications, for the method for subcarrier modulation, is characterized in that: have
Energy signal is than maximized SSB (single-side belt) pattern, and the frequency of the subcarrier of transmission is carrier frequency
With the frequency of subcarrier and or poor, represent the unlatching of subcarrier during transmission, when not sending, represent subcarrier
Closedown: phase-modulation can use the PSK of SSB to modulate, lower sideband when phase-modulation is 180 degree
The method of switching.
Subcarrier modulation method the most according to claim 1, is characterized in that: when the frequency of the subcarrier sent
When being carrier frequency, the positive of the subcarrier carrier wave of transmission and anti-phase changing method, it is also possible to switch
The method sending carrier wave, the frequency that frequency is subcarrier switching or switch, switch or the phase place that switchs and
The phase place of subcarrier is identical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110254460.3A CN102957649B (en) | 2011-08-31 | 2011-08-31 | subcarrier modulation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110254460.3A CN102957649B (en) | 2011-08-31 | 2011-08-31 | subcarrier modulation method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102957649A CN102957649A (en) | 2013-03-06 |
| CN102957649B true CN102957649B (en) | 2016-11-23 |
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ID=47765891
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110254460.3A Expired - Fee Related CN102957649B (en) | 2011-08-31 | 2011-08-31 | subcarrier modulation method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102957649B (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101765032A (en) * | 2010-01-04 | 2010-06-30 | 上海交通大学 | Dynamic multicast downlink data transmitter modulated by single side band subcarrier |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7974352B2 (en) * | 2004-12-28 | 2011-07-05 | Sharp Kabushiki Kaisha | Wireless transmitter, wireless receiver and wireless communication system |
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2011
- 2011-08-31 CN CN201110254460.3A patent/CN102957649B/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101765032A (en) * | 2010-01-04 | 2010-06-30 | 上海交通大学 | Dynamic multicast downlink data transmitter modulated by single side band subcarrier |
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| Publication number | Publication date |
|---|---|
| CN102957649A (en) | 2013-03-06 |
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| TR01 | Transfer of patent right |
Effective date of registration: 20170411 Address after: 100190 Beijing Haidian District North Fourth Ring Road West, No. 9 2106-297 Patentee after: Beijing Lei Li Li Electronics Technology Co., Ltd. Address before: 100088 Beijing, Luozhuang, west of the village of the park C305 Co-patentee before: Li Yanchao Patentee before: Liu Lijia Co-patentee before: Ji Yan |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20161123 Termination date: 20170831 |
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| DD01 | Delivery of document by public notice | ||
| DD01 | Delivery of document by public notice |
Addressee: Ji Yan Document name: Notification of Termination of Patent Right |