CN102957649A - Subcarrier modulation method - Google Patents
Subcarrier modulation method Download PDFInfo
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- CN102957649A CN102957649A CN2011102544603A CN201110254460A CN102957649A CN 102957649 A CN102957649 A CN 102957649A CN 2011102544603 A CN2011102544603 A CN 2011102544603A CN 201110254460 A CN201110254460 A CN 201110254460A CN 102957649 A CN102957649 A CN 102957649A
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- subcarrier
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 230000005540 biological transmission Effects 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims 1
- 238000004891 communication Methods 0.000 abstract description 9
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 abstract description 2
- 230000008520 organization Effects 0.000 abstract 1
- 239000002184 metal Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
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Abstract
The invention relates to a subcarrier modulation method for a radio-frequency technology, and in particular relates to an SSB (Single Side Band) modulation method with energy-signal ratio maximization. The SSB modulation method disclosed by the invention can be used for reducing the energy consumption of subcarrier emission, increasing the efficiency, lengthening the communication distance and is suitable for ISO/IEC 14443 (International Standard Organization/International Electrotechnical Commission 14443), ISO/IEC 15693 and ISO/IEC 18092 standards.
Description
Technical field
The present invention relates to the sub-carrier modulation method, especially the sub-carrier modulation method under the 13.56MHz frequency.
Background technology
At present, the sub-carrier modulation method that ISO/IEC14443, the ISO/IEC15693 under the known 13.56MHz frequency, ISO/IEC18092 standard adopt is load-modulate, and modulation signal is square wave, and effective energy is lower than 60%; Simultaneously load can not be excessive, otherwise energy consumption is excessive when subcarrier sends, and transmit leg is owing to energy shortage causes resetting, and then communication disruption; The subcarrier signal amplitude is low simultaneously, and communication distance is near, if run into metal object, communication distance is nearer again.Such as in the mobile phone mobile payment is used, owing to metals such as being subject to battery affects, communication distance is very near, poor effect.
In order to overcome the existing deficiency that sub-carrier modulation method efficiency is low, energy consumption is large, communication distance is near, the invention provides a kind of sub-carrier modulation method, the method can not only improve effective energy, and can reduce subcarrier transmission energy, thereby improves communication distance.
The invention has the beneficial effects as follows, reduce subcarrier emission energy consumption, improve usefulness, increase communication distance.
Summary of the invention
Adopt energy signal than maximized SSB (single-side belt) modulator approach:
1. the frequency of the subcarrier that sends be carrier frequency and subcarrier frequency with or poor, the unlatching of vice carrier wave during transmission, the vice carrier wave closes when not sending; Phase-modulation can adopt the PSK modulation of SSB, and phase-modulation is 180 also can use the method that lower sideband switches when spending.
2. when the frequency of the subcarrier that sends is carrier frequency, the subcarrier that sends positive and the anti-phase changing method of carrier wave, also can send with switch the method for carrier wave, the frequency of switching or switch is the frequency of subcarrier, and the phase place of switching or switch is identical with the phase place of subcarrier.
Embodiment
The general principle that realizes:
1. read-write equipment provides radio-frequency (RF) energy, sends a command to the equipment of being operated, and the equipment of being operated sends an acknowledgement to read-write equipment, and be operated equipment this moment can not provide energy, can only send modulating subcarrier.
2. read-write equipment provides radio-frequency (RF) energy, sends a command to the equipment of being operated, and the equipment of being operated sends an acknowledgement to read-write equipment, and be operated equipment this moment provides radio-frequency (RF) energy, and sends modulating subcarrier
3. general modulating mode: carrier wave adds modulation signal, and load-modulate is exactly to add variable load in radiofrequency field.Subcarrier is the modulation with square wave, therefore can produce a lot of harmonic waves, but useful signal is fundamental signal.
According to general realization principle, restriction in actual applications (take the mobile phone mobile payment as example):
1. the battery of mobile phone contains metal, and this metal has affected the transmission of radio frequency, and radiofrequency signal and energy are had decay.There is not under the condition of external antenna read-write equipment at the existing answer signal of accepting to receive under the sensitivity equipment of being operated; Be operated equally equipment and also can't correctly identify the order of read-write card equipment.
2. the battery capacity of mobile phone is limited, under present normalized current restrictive condition, presses standard signal emission, and the radiofrequency signal of emission can't compensate to as there not being battery to stop normal communication signal strength signal intensity under the condition.
Concrete settling mode
For the restriction in actual applications of general realization principle, concrete settling mode is proposed---SSB (single-side belt) solution: in order to meet existing mobile phone to the power consumption requirement of SIM card, this programme proposes maximum transmitting energy than scheme---and the SSB pattern, adopt the SSB modulating mode to realize sub-carrier modulation:
1. the frequency of the subcarrier that sends be carrier frequency and subcarrier frequency with or poor, the unlatching of vice carrier wave during transmission, the vice carrier wave closes when not sending; Phase-modulation can adopt the PSK modulation of SSB, and phase-modulation is 180 also can use the method that lower sideband switches when spending.
2. when the frequency of the subcarrier that sends is carrier frequency, the subcarrier that sends positive and the anti-phase changing method of carrier wave, also can send with switch the method for carrier wave, the frequency of switching or switch is the frequency of subcarrier, and the phase place of switching or switch is identical with the phase place of subcarrier.
Claims (3)
1. the sub-carrier modulation method in radio frequency applications, is used for the method for sub-carrier modulation, it is characterized in that: have energy signal than maximized SSB (single-side belt) pattern.
2. sub-carrier modulation method according to claim 1 is characterized in that: the frequency of the subcarrier of transmission be carrier frequency and subcarrier frequency and or poor, the unlatching of vice carrier wave during transmission, the vice carrier wave closes when not sending; Phase-modulation can adopt the PSK modulation of SSB, and phase-modulation is 180 also can use the method that lower sideband switches when spending.
3. a kind of sub-carrier modulation production method according to claim 1, it is characterized in that: when the frequency of the subcarrier that sends is carrier frequency, the subcarrier that sends positive and the anti-phase changing method of carrier wave, also can send with switch the method for carrier wave, the frequency of switching or switch is the frequency of subcarrier, and the phase place of switching or switch is identical with the phase place of subcarrier.
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 true CN102957649A (en) | 2013-03-06 |
| CN102957649B CN102957649B (en) | 2016-11-23 |
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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 |
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| CN (1) | CN102957649B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080043880A1 (en) * | 2004-12-28 | 2008-02-21 | Yoshiteru Matsushita | Wireless Transmitter, Wireless Receiver and Wireless Communication System |
| 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 |
-
2011
- 2011-08-31 CN CN201110254460.3A patent/CN102957649B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080043880A1 (en) * | 2004-12-28 | 2008-02-21 | Yoshiteru Matsushita | Wireless Transmitter, Wireless Receiver and Wireless Communication System |
| 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 |
|---|---|
| CN102957649B (en) | 2016-11-23 |
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| C06 | Publication | ||
| PB01 | Publication | ||
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| C14 | Grant of patent or utility model | ||
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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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| TR01 | Transfer of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20161123 Termination date: 20170831 |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| DD01 | Delivery of document by public notice |
Addressee: Ji Yan Document name: Notification of Termination of Patent Right |
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| DD01 | Delivery of document by public notice |