CN102684711B - Based on the transmitter of CDMA standard - Google Patents
Based on the transmitter of CDMA standard Download PDFInfo
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- CN102684711B CN102684711B CN201110060709.7A CN201110060709A CN102684711B CN 102684711 B CN102684711 B CN 102684711B CN 201110060709 A CN201110060709 A CN 201110060709A CN 102684711 B CN102684711 B CN 102684711B
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Abstract
The present invention relates to a kind of transmitter based on CDMA standard, comprise produce carrier wave carrier generator, the frequency of carrier signal is amplified to meet tranmitting frequency and require power amplifier, launch the electromagnetic carrier transmit antenna of carrier wave frequency range after power amplifier amplifies, the communication traffic data stream interface obtaining the digital information flow of the data that communication traffic produces, digital signal processing module, digital to analog converter and metamaterial space modulator.According to transmitter of the present invention, eliminate the multiple devices in existing CDMA transmitter, structure is very simple, and effectively can reduce nonlinear distortion.
Description
Technical field
The present invention relates to wireless communication field, more particularly, relate to a kind of transmitter based on CDMA standard.
Background technology
CDMA, is exactly utilize exhibition mechanics of communication frequently, thus can reduces the interference between mobile phone, and can the capacity of adding users, and the power of mobile phone can also do lower, service time not only can be made longer, the more important thing is and can reduce the injury of electromagenetic wave radiation to people.The bandwidth of CDMA can be expanded comparatively large, and can also transmit image, this is the reason why third generation mobile phone selects CDMA.With regard to security performance, CDMA not only has good certification system, more because the characteristic of its transmission, distinguishes user, prevent being stolen the ability of listening by people and strengthen widely with code.In the positive fast development of current cdma system.Wideband CDMA (WCDMA) Wideband Code Division Multiple Access (WCDMA) transmission technology is the important foundation technology of IMT-2000, will be one of the standard of third generation digit wireless communication system.
CDMA is the one of spread spectrum communication, and he has the following characteristics of spread spectrum communication:
(1) antijamming capability is strong.This is the basic characteristics of spread spectrum communication, is that all communication modes are incomparable.
(2) wideband transmit, anti-fading ability is strong.
(3) owing to adopting wideband transmit, the power of the power ratio interference signal of the useful signal transmitted in the channel is much lower, and therefore signal is as hidden in noise; Namely power words density ratio is lower, is conducive to signal hidden.
(4) utilize the correlation of spreading code to obtain the information of user, the ability of Anti TBIgG is strong.
(5) multiple user receives simultaneously, sends simultaneously.
In existing cdma communication system, its course of work of transmitter is as follows: first signal is modulated by I/Q modulator, again by upper intermediate frequency, intermediate frequency amplification filtering, the carrier wave produced with carrier generator again carries out the mixing of transmitting up-conversion, then amplified by rf filtering and power amplifier, finally gone out by antenna transmission.In this series of amplification, signal is difficult to keep linear, easily cause nonlinear distortion question, and there have the Design and manufacture of the frequency mixer of material impact (parts in I/Q modulator), voltage controlled oscillator (parts in carrier generator) and power amplifier to require to systematic function to be very high, performance has been difficult to be greatly improved, therefore, need revolutionary thinking and design new device to transform existing transmitter, improve its service behaviour and efficiency, reduce power consumption.
Summary of the invention
The technical problem to be solved in the present invention is, easily produces nonlinear distortion and the more defect of parts, provide one can improve service behaviour and efficiency, and can reduce the transmitter based on CDMA standard of power consumption for existing CDMA transmitter.
The present invention solves the problems of the technologies described above adopted technical scheme: a kind of transmitter based on CDMA standard, described transmitter comprises carrier generator, power amplifier, carrier transmit antenna, communication traffic data stream interface, digital signal processing module, digital to analog converter and metamaterial space modulator, wherein: described carrier generator, for generation of carrier wave; Described power amplifier, the frequency for the carrier signal produced by carrier generator is amplified to the requirement meeting tranmitting frequency; Described carrier transmit antenna, for the electromagnetic wave of carrier wave frequency range of spatial emission after power amplifier amplifies; Described communication traffic data stream interface, for obtaining the digital information flow of the data that various communication traffic produces, and by the transfer of data of acquisition to digital signal processing module; Described digital signal processing module, carries out preliminary treatment to input data wherein; Described digital to analog converter, changes into analog voltage signal by the digital signal of the data be passed to wherein and outputs to metamaterial space modulator; Described metamaterial space modulator, is modulated to described analog voltage signal in carrier signal, and sends the electromagnetic wave with communication traffic traffic flow information of the electromagnetic radiation aligned phase signal modulating out with CDMA standard modulation scheme.
Further, described communication traffic comprises voice message communications business, model of data service, short message communication traffic and digital broadcasting communication traffic.
Further, described preliminary treatment comprises chnnel coding, message sink coding and encryption.
Further, described power amplifier is arrowband power amplifier.
Further, described carrier generator is microlock source.
Further, described digital signal processing module is FPGA, ASIC special digital chip or dsp chip.
Further, described metamaterial space modulator comprises base material and is arranged on the multiple metal micro structures on base material, each metal micro structure is all provided with semiconductor element, all semiconductor elements are all electrically connected with digital to analog converter by wire, to be loaded on every semiconductor element by analog voltage signal.
Further, described semiconductor element is resistance, inductance or electric capacity.
Further, described semiconductor element is attached on metal micro structure.
Further, described semiconductor element is the SMD variable capacitance be attached on metal micro structure.
Further, described metal micro structure is the metal wire with specific pattern that the method for carving by etching, electroplating, bore quarter, photoetching, electronics quarter or ion is attached on plate shape substrates.
Further, described metal micro structure is single radial cut straight-flanked ring, and described semiconductor element is attached to the described opening part of single radial cut straight-flanked ring and the two ends of connection opening.
Further, described metal wire is copper cash or silver-colored line.
Further, described base material is formed by multiple plate shape substrates is stacking, and each plate shape substrates is all attached with multiple metal micro structure.
Further, described plate shape substrates is obtained by ceramic material, epoxy resin or polytetrafluoroethylene.
Further, described carrier wave was separated before not entering metamaterial space modulator with analog voltage signal.
According to the transmitter that the present invention is based on CDMA standard, instead of the multiple devices in existing CDMA transmitter by metamaterial space modulator, structure is very simple, and effectively can reduce nonlinear distortion.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the structural representation of a transmitter provided by the invention embodiment;
Fig. 2 is the structural representation of metamaterial space modulator in the present invention.
Figure 3 shows that the connection diagram of metal micro structure and semiconductor element in an embodiment in the present invention;
Fig. 4 is the structural representation of the metamaterial space modulator of metal micro structure shown in this employing Fig. 3.
Embodiment
" Meta Materials " refers to some artificial composite structures with the extraordinary physical property not available for natural material or composite material.By the structurally ordered design on the key physical yardstick of material, the restriction of some apparent natural law can be broken through, thus obtain the meta-materials function exceeding the intrinsic common character of nature.
Three key characters that " Meta Materials " is important:
(1) " Meta Materials " normally has the composite material of novel artificial structure;
(2) " Meta Materials " has extraordinary physical property (often in natural material not available);
(3) " Meta Materials " character is determined jointly by the intrinsic properties of constituent material and man-made microstructure wherein.
The present invention utilizes Meta Materials to build a kind of transmitter based on CDMA standard.Specific as follows:
As shown in Figure 1, according to the transmitter based on CDMA standard of the present invention, comprise carrier generator 100, power amplifier 200, carrier transmit antenna 300, communication traffic data stream interface 400, digital signal processing module 500, digital to analog converter 600 and metamaterial space modulator 700, wherein: described carrier generator 100, for generation of carrier wave; Described power amplifier 200, the frequency for the carrier signal produced by carrier generator 100 is amplified to the requirement meeting tranmitting frequency; Described carrier transmit antenna 300, for the electromagnetic wave of carrier wave frequency range of spatial emission after power amplifier amplifies; Described communication traffic data stream interface 400, for obtaining the digital information flow of the data that various communication traffic produces, and by the transfer of data of acquisition to digital signal processing module 500; Described digital signal processing module 500, carries out preliminary treatment to input data wherein; Described digital to analog converter 600, changes into analog voltage signal by the digital signal of the data be passed to wherein and outputs to metamaterial space modulator 700; Described metamaterial space modulator 700, is modulated to described analog voltage signal in carrier signal, and sends the electromagnetic wave with communication traffic traffic flow information of the electromagnetic radiation aligned phase signal modulating out with CDMA standard modulation scheme.The electromagnetic wave that described metamaterial space modulator 700 sends finally is received by corresponding receiver, and by the demodulator circuit demodulation of above-mentioned receiver, thus be original communication traffic traffic flow information by the signals revivification on carrier wave.
Above-mentioned communication traffic mainly comprises voice message communications business, model of data service, short message communication traffic and digital broadcasting communication traffic etc.
Above-mentioned preliminary treatment comprises chnnel coding, message sink coding and encryption.
Described power amplifier 200 is arrowband power amplifier.
Described carrier generator 100 is microlock source.It is low that microlock source has noise level, and power is large, and frequency stability is high, and coordinate simple, is easy to produce the advantages such as wideband frequency modulation signal.By appropriate design phase-locked loop parameter, effectively can suppress the noise of reference frequency source and VCO, obtain low noise and export.
Described digital signal processing module 500 is FPGA, ASIC special digital chip or dsp chip.Above-mentioned hardware realizes digital signal processing module above-mentioned functions by software programming.
Described metamaterial space modulator 700 is core of the present invention, and its structural principle is as follows:
As shown in Figures 2 to 4, according to metamaterial space modulator 100 of the present invention, comprise base material 1 and be arranged on the multiple metal micro structures 2 on base material 1, each metal micro structure 2 is all provided with semiconductor element 3, all semiconductor elements 3 are all electrically connected with digital to analog converter by wire 4, to be loaded into by analog voltage signal on every semiconductor element 3.After analog voltage signal is loaded into each metal micro structure 2 and semiconductor element 3, have influence on the characteristic electron (as a kind of in resistance value, inductance value and capacitance or its combination) of the semiconductor element 3 on metal micro structure, thus result in the electromagnetic response characteristic variations of metal micro structure, and then change the electromagnetic parameter characteristic of Meta Materials.Thus the response frequency of each metal micro structure 2 self can change, thus year wave frequency by metamaterial space modulator 100 can be changed, thus analog voltage signal is modulated on carrier wave.Will with data-signal (analog voltage signal be a kind of data-signal) by the electromagnetic wave after metamaterial space modulator.Each metal micro structure 2 is when analog voltage signal is loaded on it, its electromagnetic parameter (dielectric constant and magnetic permeability) can be changed, we can think to change its equivalent capacity in the change (being herein dielectric constant) of electromagnetic parameter, the change of electric capacity will inevitably cause the change of metal micro structure self response frequency, the change of metal micro structure self response frequency then can affect year wave frequency by it, carrying wave frequency is a vector, it comprises amplitude and phase place, therefore be actually and complete amplitude modulation and phase modulation, thus by being loaded on carrier wave in analog voltage signal.In addition, amplitude modulation and phase modulation is combined can realize any modulation.Shown in Fig. 2, the line of the band arrow on the left side represents incident carrier wave (before unmodulated), and the line of the right band arrow represents the electromagnetic wave after modulation.
Described semiconductor element 3 in the present invention can be attached on metal micro structure 2, also can embed in metal micro structure 2.
In the present embodiment, described metal micro structure 2 is the metal wire with specific pattern that the method for carving by etching, electroplating, bore quarter, photoetching, electronics quarter or ion is attached on plate shape substrates.Described metal wire is preferably copper cash or silver-colored line.Copper conducts electricity very well with silver, sensitiveer to the response of electric field.
In the present embodiment, described base material 1 is formed by multiple plate shape substrates 11 is stacking, and each plate shape substrates 11 is all attached with multiple metal micro structure 2, and all metal micro structures 2 form periodic array in space.Shown in Fig. 2, for piling a metamaterial space modulator schematic diagram of poststack.Not performance in single plate shape substrates Fig. 2.
Described plate shape substrates 11 of the present invention can be obtained by ceramic material, epoxy resin or polytetrafluoroethylene.As an embodiment, select polytetrafluoroethylene to make plate shape substrates.The electrical insulating property of polytetrafluoroethylene is very good, therefore can not produce interference to electromagnetic electric field, and have excellent chemical stability, corrosion resistance, long service life, and the base material as metal micro structure attachment is good selection.
When base material is selected, by changing the pattern of metal micro structure, the arrangement in space of design size and/or metal micro structure obtains the modulation effect wanted, this is because, by changing the pattern of metal micro structure, the arrangement in space of design size and/or metal micro structure, can change metamaterial space modulator electromagnetic parameter ε and μ of each unit in space, thus when there being analog voltage signal to be carried on metal micro structure, the effective electromagnetic parameter of every bit in space can be designed, correspondingly obtain its equivalent capacity, and then obtain the response frequency of each metal micro structure self, thus can accurately control metamaterial space modulator the modulation of every bit in space, and then obtain the modulation (overall modulation) that we want.How as the pattern obtaining metal micro structure, the arrangement in space of design size and/or metal micro structure, this method is multiple, give an example, can be obtained by reverse computer simulation, the first modulation effect of our needs, the electromagnetic parameter distribution designing metamaterial space modulator entirety is gone according to this effect, the electromagnetic parameter distribution of every bit in space is calculated again from entirety, the pattern of corresponding metal micro structure is selected according to the electromagnetic parameter of this every bit, design size and/or metal micro structure arrangement in space (having deposited various metals microstructural data in advance in computer), the method of exhaustion can be used to the design of each point, such as first select the metal micro structure that has specific pattern, calculate electromagnetic parameter, by the contrast that the result obtained and we are wanted, contrast recirculation repeatedly, until till the electromagnetic parameter finding us to want, if have found, the design parameter then completing metal micro structure is selected, if do not find, then change a kind of metal micro structure of pattern, repeat circulation above, until till the electromagnetic parameter finding us to want.If still do not found, then said process also can not stop.That is, after only have found the metal micro structure of the electromagnetic parameter that we need, program just can stop.Because this process is all completed by computer, therefore, seem complicated, in fact can complete soon.
Circle in Fig. 2 in metamaterial space modulator is not the pattern of metal micro structure, and just represent and be provided with metal micro structure 2 herein, the different sizes as circle are then represent different metal micro structures.Metal micro structures different herein has multiple situation, such as, can be that the pattern of metal micro structure is identical, but its design size is different; Also can be that pattern is all not identical with design size.This according to specific needs can be different, irregularly to say, it is all the result after Computer Simulation, that is in whole metamaterial space modulator, the pattern of metal micro structure, design size and spatial arrangement all obtain by computer is reverse, because the substantial amounts of metal micro structure in whole metamaterial space modulator, if therefore Top-Down Design, be difficult to realize.
Figure 3 shows that a preferred embodiment of the metal micro structure that the present invention is obtained by Computer Simulation, described metal micro structure 2 is single radial cut straight-flanked ring, described semiconductor element 3 is attached to the described opening part of single radial cut straight-flanked ring and the two ends of connection opening, above-mentioned partly lead not element 3 be one in resistance, inductance or electric capacity or its combine.Semiconductor element 3 described in preferential selection of land is for being attached to the SMD variable capacitance on metal micro structure, and be carried in the in different size of the voltage signal at SMD variable capacitance two ends, capacitance can ensue change.The change of capacitance, then change the electromagnetic parameter (it is the change of dielectric constant that electric capacity changes corresponding) of that the metal micro structure present position corresponding with SMD variable capacitance, can regulate the electromagnetic parameter of all metal micro structure present positions by regulating plurality of voltages signal, thus achieve electromagnetic parameter distribution adjustable (namely refractive index is adjustable) of modulator entirety between Meta Materials reality, namely metal micro structure self response frequency is adjustable, the adjustment of metal micro structure self response frequency then can affect year wave frequency by it, carrying wave frequency is a vector, it comprises amplitude and phase place, therefore be actually and complete amplitude modulation and phase modulation, thus by being loaded on carrier wave in analog voltage signal.Particularly, in Meta Materials space, the electromagnetic parameter of often is all adjustable, and then to be realized to the control of the amplitude of carrier wave and phase place by the resonance point frequency changing each metal micro structure that (if the resonance point of a certain metal micro structure is identical with year wave frequency, then electromagnetic wave is not by this metal micro structure; Otherwise if the resonance point of a certain metal micro structure is not with to carry wave frequency identical, then electromagnetic wave can pass through this metal micro structure), in addition, amplitude modulation and phase modulation is combined can realize any modulation.
Fig. 4 be the structure shown in Fig. 3 on plate shape substrates 11 layout viewing, should be understood that, this is a signal, and the shape of metal micro structure 2, quantity and spatial arrangement are not limited to this.Wherein, the stacking direction of plate shape substrates is perpendicular to the direction of paper.In addition in Fig. 4, conveniently draw, eliminate wire 4.
By reference to the accompanying drawings embodiments of the invention are described above; but the present invention is not limited to above-mentioned embodiment; above-mentioned embodiment is only schematic; instead of it is restrictive; those of ordinary skill in the art is under enlightenment of the present invention; do not departing under the ambit that present inventive concept and claim protect, also can make a lot of form, these all belong within protection of the present invention.
Claims (14)
1. the transmitter based on CDMA standard, it is characterized in that, described transmitter comprises carrier generator, power amplifier, carrier transmit antenna, communication traffic data stream interface, digital signal processing module, digital to analog converter and metamaterial space modulator, effectively to reduce nonlinear distortion, wherein:
Described carrier generator, for generation of carrier wave;
Described power amplifier, the frequency for the carrier signal produced by carrier generator is amplified to the requirement meeting tranmitting frequency;
Described carrier transmit antenna, for the electromagnetic wave of carrier wave frequency range of spatial emission after power amplifier amplifies;
Described communication traffic data stream interface, for obtaining the digital information flow of the data that various communication traffic produces, and by the transfer of data of acquisition to digital signal processing module;
Described digital signal processing module, carries out preliminary treatment to input data wherein;
Described digital to analog converter, changes into analog voltage signal by the digital signal of the data be passed to wherein and outputs to metamaterial space modulator;
Described metamaterial space modulator, is modulated to described analog voltage signal in carrier signal, and sends the electromagnetic wave with communication traffic traffic flow information of the electromagnetic radiation aligned phase signal modulating out with CDMA standard modulation scheme;
Described metamaterial space modulator comprises base material and is arranged on the multiple metal micro structures on base material, and each metal micro structure is all provided with semiconductor element, and described semiconductor element is attached on metal micro structure or embeds in metal micro structure; All semiconductor elements are all electrically connected with digital to analog converter by wire, to be loaded into by analog voltage signal on every semiconductor element; After described analog voltage signal is loaded into described each metal micro structure and described semiconductor element, have influence on the characteristic electron of the described semiconductor element on described metal micro structure, described characteristic electron is one or its combination of resistance value, inductance value and capacitance.
2. the transmitter based on CDMA standard according to claim 1, is characterized in that, described communication traffic comprises voice message communications business, model of data service, short message communication traffic and digital broadcasting communication traffic.
3. the transmitter based on CDMA standard according to claim 1, is characterized in that, described preliminary treatment comprises chnnel coding, message sink coding and encryption.
4. the transmitter based on CDMA standard according to claim 1, is characterized in that, described power amplifier is arrowband power amplifier.
5. the transmitter based on CDMA standard according to claim 1, is characterized in that, described carrier generator is microlock source.
6. the transmitter based on CDMA standard according to claim 1, is characterized in that, described digital signal processing module is FPGA, ASIC special digital chip or dsp chip.
7. the transmitter based on CDMA standard according to claim 1, is characterized in that, described semiconductor element is resistance, inductance or electric capacity.
8. the transmitter based on CDMA standard according to claim 1, is characterized in that, described semiconductor element is the SMD variable capacitance be attached on metal micro structure.
9. the transmitter based on CDMA standard according to claim 1, is characterized in that, described metal micro structure is the metal wire with specific pattern that the method for carving by etching, electroplating, bore quarter, photoetching, electronics quarter or particle is attached on plate shape substrates.
10. the transmitter based on CDMA standard according to claim 1, described metal micro structure is single radial cut straight-flanked ring, and described semiconductor element is attached to the described opening part of single radial cut straight-flanked ring and the two ends of connection opening.
11. transmitters based on CDMA standard according to claim 9, is characterized in that, described metal wire is copper cash or silver-colored line.
12. transmitters based on CDMA standard according to claim 1, is characterized in that, described base material is formed by multiple plate shape substrates is stacking, and each plate shape substrates is all attached with multiple metal micro structure.
13. transmitters based on CDMA standard according to claim 12, it is characterized in that, described plate shape substrates is obtained by ceramic material, epoxy resin or polytetrafluoroethylene.
14. transmitters based on CDMA standard according to claim 1, it is characterized in that, described carrier wave was separated before not entering metamaterial space modulator with analog voltage signal.
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| CN106329147A (en) * | 2016-09-09 | 2017-01-11 | 南京大学 | Method of modulating amplitude of electromagnetic wave in free space by use of adjustable artificial electromagnetic super surface |
| CN108377139B (en) * | 2018-01-30 | 2021-09-14 | Oppo广东移动通信有限公司 | Electronic device |
| CN112217528B (en) * | 2020-10-12 | 2022-04-29 | 维沃移动通信有限公司 | Transmitter, communication system, and electronic device |
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| CN1165458A (en) * | 1997-04-21 | 1997-11-19 | 北京信威通信技术有限公司 | Time division duplex synchronous code partition multi-address radio communication system |
| CN1988522A (en) * | 2005-12-20 | 2007-06-27 | 中兴通讯股份有限公司 | Multiple path multiple carrier digital pre-distortion sender of wideband CDMA base station system |
| CN101103489A (en) * | 2004-11-19 | 2008-01-09 | 惠普开发有限公司 | Composite material with controllable resonant cells |
| CN101694558A (en) * | 2009-10-21 | 2010-04-14 | 电子科技大学 | Metamaterial structure for modulating terahertz wave |
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| US8421706B2 (en) * | 2009-02-27 | 2013-04-16 | Toyota Motor Engineering & Manufacturing North America, Inc. | Metamaterial microwave lens |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1165458A (en) * | 1997-04-21 | 1997-11-19 | 北京信威通信技术有限公司 | Time division duplex synchronous code partition multi-address radio communication system |
| CN101103489A (en) * | 2004-11-19 | 2008-01-09 | 惠普开发有限公司 | Composite material with controllable resonant cells |
| CN1988522A (en) * | 2005-12-20 | 2007-06-27 | 中兴通讯股份有限公司 | Multiple path multiple carrier digital pre-distortion sender of wideband CDMA base station system |
| CN101694558A (en) * | 2009-10-21 | 2010-04-14 | 电子科技大学 | Metamaterial structure for modulating terahertz wave |
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