CN102684711A - Transmitter based on CDMA (Code Division Multiple Access) system - Google Patents
Transmitter based on CDMA (Code Division Multiple Access) system Download PDFInfo
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- CN102684711A CN102684711A CN2011100607097A CN201110060709A CN102684711A CN 102684711 A CN102684711 A CN 102684711A CN 2011100607097 A CN2011100607097 A CN 2011100607097A CN 201110060709 A CN201110060709 A CN 201110060709A CN 102684711 A CN102684711 A CN 102684711A
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Abstract
The invention relates to a transmitter based on a CDMA (Code Division Multiple Access) system, comprising a carrier generator for generating carriers, a power amplifier for amplifying the frequency of a carrier signal to meet requirements on the transmitting frequency, a carrier transmitting antenna for transmitting electromagnetic waves in a carrier frequency range amplified by the power amplifier, a communication business data stream interface for obtaining digital information flow of data generated by the communication business, a digital signal processing module, a digital-to-analog converter and a meta-material space modulator. A plurality of devices in the current CDMA transmitter are omitted, and the transmitter has a very simple structure, and further is capable of effectively decreasing nonlinear distortion.
Description
Technical field
The present invention relates to wireless communication field, more particularly, relate to a kind of transmitter based on the CDMA standard.
Background technology
CDMA is exactly to utilize exhibition mechanics of communication frequently, thereby can reduces the interference between the mobile phone; And can increase user's capacity; And the power of mobile phone can also do lower, not only can make service time longer, the more important thing is and can reduce the injury of electromagenetic wave radiation the people.The bandwidth of CDMA can be expanded bigger, can also transmit image, and this is the reason why third generation mobile phone selects CDMA for use.With regard to security performance, CDMA not only has good authentication system, more because the characteristic of its transmission is distinguished the user with sign indicating number, prevents that being stolen the ability of listening by the people strengthens widely.In the positive fast development of cdma system at present.Wideband CDMA (WCDMA) WCDMA transmission technology for the important foundation technology of IMT-2000, will be one of standard of third generation digit wireless communication system.
CDMA is a kind of 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 adopt wideband transmit, the power of the power ratio interference signal of the useful signal that in channel, transmits is much lower, so signal is like hidden in noise; Be that power words density is lower, it is hidden to help signal.
(4) utilize the correlation of spreading code to obtain user's information, the anti-ability of intercepting and capturing is strong.
(5) a plurality of users receive simultaneously, send simultaneously.
Its course of work of transmitter is following in the existing C DMA communication system: signal is at first modulated through the I/Q modulator; Again through last intermediate frequency, intermediate frequency amplification filtering; Launch the up-conversion mixing with the carrier wave of carrier generator generation again; Amplify through rf filtering and power amplifier then, launch by antenna at last.In this a series of amplification, it is linear that signal is difficult to keep, and causes nonlinear distortion question easily; And systematic function there are the design and the manufacturing of frequency mixer (parts in the I/Q modulator), voltage controlled oscillator (parts in the carrier generator) and the power amplifier of material impact require very high; Performance has been difficult to be greatly improved, and therefore, needs revolutionary thinking and designs new device and transform existing transmitter; Improve its service behaviour and efficient, reduce power consumption.
Summary of the invention
The technical problem that the present invention will solve is, is easy to generate nonlinear distortion and the more defective of parts to existing C DMA transmitter, provides a kind of and can improve service behaviour and efficient, and can reduce the transmitter based on the CDMA standard of power consumption.
The present invention solves the problems of the technologies described above the technical scheme that is adopted: a kind of transmitter based on the CDMA standard; Said transmitter comprises carrier generator, power amplifier, carrier transmit antenna, communication traffic data stream interface, digital signal processing module, digital to analog converter and ultra material space modulator; Wherein: said carrier generator is used to produce carrier wave; Said power amplifier, the frequency of the carrier signal that is used for carrier generator is produced is amplified to the requirement that meets tranmitting frequency; Said carrier transmit antenna is used for the electromagnetic wave to the carrier wave frequency range of spatial emission after power amplifier amplifies; Said communication traffic data stream interface is used to obtain the digital information flow of the data that various communication traffics produce, and with the transfer of data that obtains to digital signal processing module; Said digital signal processing module carries out preliminary treatment to input data wherein; Said digital to analog converter, the digital signal that will import data wherein into changes into analog voltage signal and outputs to ultra material space modulator; Said ultra material space modulator is modulated to said analog voltage signal on the carrier signal, and sends the electromagnetic wave of modulating out with the CDMA standard modulation system corresponding to electromagnetic wave that has the communication traffic traffic flow information that transmits.
Further, said communication traffic comprises voice messaging communication traffic, data communication business, short message communication traffic and digital broadcasting communication traffic.
Further, said preliminary treatment comprises chnnel coding, source encoding and encryption.
Further, said power amplifier is the arrowband power amplifier.
Further, said carrier generator is the microlock source.
Further, said digital signal processing module is FPGA, ASIC special digital chip or dsp chip.
Further; Said ultra material space modulator comprises base material and is arranged on a plurality of metal micro structures on the base material; All be provided with semiconductor element on each metal micro structure; All semiconductor elements all are electrically connected with digital to analog converter through lead, so that analog voltage signal is loaded on each semiconductor element.
Further, said semiconductor element is resistance, inductance or electric capacity.
Further, said semiconductor element is attached on the metal micro structure.
Further, said semiconductor element is the SMD variable capacitance that is attached on the metal micro structure.
Further, said metal micro structure for through etching, plating, brill quarter, photoetching, electronics is carved or ion is carved method attached to the metal wire on the plate shape substrates with specific pattern.
Further, said metal micro structure is the single radial cut straight-flanked ring, and said semiconductor element is attached to the opening part of said single radial cut straight-flanked ring and the two ends of connection opening.
Further, said metal wire is copper cash or silver-colored line.
Further, said base material is piled up by a plurality of plate shape substrates and forms, and all is attached with a plurality of metal micro structures on each plate shape substrates.
Further, said plate shape substrates is made by ceramic material, epoxy resin or polytetrafluoroethylene.
Further, said carrier wave separated before not getting into ultra material space modulator with analog voltage signal.
According to the transmitter that the present invention is based on the CDMA standard, replaced a plurality of devices in the existing C DMA transmitter by ultra material space modulator, structure is very simple, and can effectively reduce nonlinear distortion.
Description of drawings
To combine accompanying drawing and embodiment that the present invention is described further below, in the accompanying drawing:
Fig. 1 is the structural representation of an embodiment of transmitter provided by the invention;
Fig. 2 is the structural representation of ultra material space modulator among the present invention.
Shown in Figure 3ly be the be connected sketch map of metal micro structure among embodiment among the present invention with semiconductor element;
Fig. 4 adopts the structural representation of the ultra material space modulator of metal micro structure shown in Figure 3 for this.
Embodiment
" ultra material " is meant artificial composite structure or the composite material that some have the not available extraordinary physical property of natural material.Structurally ordered design through on the key physical yardstick of material can break through the restriction of some apparent natural law, thereby obtains to exceed the meta-materials function of the intrinsic common character of nature.
Three key characters that " ultra material " is important:
(1) " ultra material " the composite material that normally has novel artificial structure;
(2) " ultra material " has extraordinary physical property (not available in the natural often material);
(3) " ultra material " character is determined by the intrinsic properties of constituent material and artificial micro-structural wherein jointly.
The present invention utilizes ultra material to make up a kind of transmitter based on the CDMA standard.Specific as follows:
As shown in Figure 1; According to the transmitter based on the 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 ultra material space modulator 700; Wherein: said carrier generator 100 is used to produce carrier wave; Said power amplifier 200, the frequency of the carrier signal that is used for carrier generator 100 is produced is amplified to the requirement that meets tranmitting frequency; Said carrier transmit antenna 300 is used for the electromagnetic wave to the carrier wave frequency range of spatial emission after power amplifier amplifies; Said communication traffic data stream interface 400 is used to obtain the digital information flow of the data that various communication traffics produce, and with the transfer of data that obtains to digital signal processing module 500; Said digital signal processing module 500 carries out preliminary treatment to input data wherein; Said digital to analog converter 600, the digital signal that will import data wherein into changes into analog voltage signal and outputs to ultra material space modulator 700; Said ultra material space modulator 700 is modulated to said analog voltage signal on the carrier signal, and sends the electromagnetic wave of modulating out with the CDMA standard modulation system corresponding to electromagnetic wave that has the communication traffic traffic flow information that transmits.The electromagnetic wave that said ultra material space modulator 700 sends is finally received by respective receiver, and by the demodulator circuit demodulation of above-mentioned receiver, thereby the signal on the carrier wave is reduced to original communication traffic traffic flow information.
Above-mentioned communication traffic mainly comprises voice messaging communication traffic, data communication business, short message communication traffic and digital broadcasting communication traffic etc.
Above-mentioned preliminary treatment comprises chnnel coding, source encoding and encryption.
Said power amplifier 200 is the arrowband power amplifier.
Said carrier generator 100 is the microlock source.It is low that the microlock source has noise level, and power is big, and frequency stability is high, and coordinate simply, is easy to produce advantages such as WBFM signal.Through appropriate design phase-locked loop parameter, can suppress the noise of reference frequency source and VCO effectively, obtain low noise output.
Said digital signal processing module 500 is FPGA, ASIC special digital chip or dsp chip.Above-mentioned hardware is realized the digital signal processing module above-mentioned functions through software programming.
Said ultra material space modulator 700 is a core of the present invention, and its structural principle is following:
Extremely shown in Figure 4 like Fig. 2; According to ultra material space modulator 100 of the present invention; Comprise base material 1 and be arranged on a plurality of metal micro structures 2 on the base material 1; All be provided with semiconductor element 3 on each metal micro structure 2, all semiconductor elements 3 all are electrically connected with digital to analog converter through lead 4, analog voltage signal is loaded on each semiconductor element 3.After analog voltage signal is loaded into each metal micro structure 2 and semiconductor element 3; Had influence on the characteristic electron (a kind of or its combination) of the semiconductor element 3 on the metal micro structure like resistance value, inductance value and capacitance; Thereby caused the electromagnetic response characteristic variations of metal micro structure, and then changed the electromagnetic parameter characteristic of ultra material.Thereby the response frequency of each metal micro structure 2 self can change, thereby can change the frequency through the carrier wave of ultra material space modulator 100, thereby analog voltage signal is modulated on the carrier wave.To have data-signal (analog voltage signal is a kind of data-signal) through the electromagnetic wave behind the ultra material space modulator.Each metal micro structure 2 is when analog voltage signal is loaded on it; Can change its electromagnetic parameter (dielectric constant and magnetic permeability); We can think to have changed its equivalent capacity the change of electromagnetic parameter (being dielectric constant here), and the change of electric capacity will inevitably cause the change of metal micro structure self response frequency, and the change of metal micro structure self response frequency then can influence the frequency through its carrier wave; The frequency of carrier wave is a vector; It comprises amplitude and phase place, therefore is actually and has accomplished amplitude modulation and phase modulation, thereby with being loaded on the carrier wave in the analog voltage signal.In addition, amplitude modulation and phase modulation are combined can realize any modulation.Shown in Figure 2, the line of the band arrow on the left side is represented the carrier wave of incident (before unmodulated), the electromagnetic wave after the line of the right band arrow is represented to modulate.
Said semiconductor element 3 among the present invention can be attached on the metal micro structure 2, also can embed in the metal micro structure 2.
In the present embodiment, said metal micro structure 2 for through etching, plating, brill quarter, photoetching, electronics is carved or ion is carved method attached to the metal wire on the plate shape substrates with specific pattern.Said metal wire is preferably copper cash or silver-colored line.Copper conducts electricity very well with silver, and is sensitive more to the response of electric field.
In the present embodiment, said base material 1 is piled up by a plurality of plate shape substrates 11 and forms, and all is attached with a plurality of metal micro structures 2 on each plate shape substrates 11, and all metal micro structures 2 form periodic array in the space.Shown in Figure 2, be one after piling up ultra material space modulator sketch map.Not performance among single plate shape substrates Fig. 2.
Said plate shape substrates 11 of the present invention can be made by ceramic material, epoxy resin or polytetrafluoroethylene.As an embodiment, select for use polytetrafluoroethylene to process plate shape substrates.The electrical insulating property of polytetrafluoroethylene is very good, and therefore can not produce and disturb, and have excellent chemical stability, corrosion resistance electromagnetic electric field, long service life, the base material that adheres to as metal micro structure is good selection.
Under the situation that base material is selected; Obtain the modulation effect wanted through pattern, design size and/or metal micro structure the arranging in the space that changes metal micro structure; This is because through changing pattern, design size and/or metal micro structure the arranging in the space of metal micro structure, can change the electromagnetic parameter ε and the μ of each unit in the space, ultra material space modulator place; Thereby when having analog voltage signal to be carried on the metal micro structure; Can design the equivalent electric magnetic parameter of every bit in the space, correspondingly obtain its equivalent capacity, and then obtain the response frequency of each metal micro structure self; Thereby can accurately control the modulation of every bit in the space, ultra material space modulator place, and then obtain the modulation (whole modulation) that we want.How as for pattern, design size and/or metal micro structure the arranging in the space that obtains metal micro structure, this method is multiple, gives an example; Can obtain through reverse computer simulation, the first modulation effect that we need removes to design the whole electromagnetic parameter of ultra material space modulator according to this effect and distributes; Calculate the electromagnetic parameter distribution of every bit the space again from integral body; Select pattern, design size and/or metal micro structure the arranging in the space (having deposited multiple metal micro structure data in the computer in advance) of corresponding metal micro-structural according to the electromagnetic parameter of this every bit, can use the method for exhaustion, for example earlier selected metal micro structure with specific pattern to the design of each point; Calculate electromagnetic parameter; Contrast with the result who obtains and we want contrasts recirculation repeatedly, till the electromagnetic parameter that finds us to want; If found, then accomplished the parameter choosing of metal micro structure; If do not find, then change a kind of metal micro structure of pattern, the circulation above repeating is till the electromagnetic parameter that finds us to want.If still do not find, then said process can not stop yet.After that is to say the metal micro structure of the electromagnetic parameter that has only found our needs, program just can stop.Because this process is all accomplished by computer, therefore, seem complicated, can accomplish soon in fact.
Circle among Fig. 2 on the ultra material space modulator is not the pattern of metal micro structure, and just expression is provided with metal micro structure 2 here, then is expression different metallic micro-structural as for the different sizes of circle.The different metallic micro-structural has multiple situation here, for example can be that the pattern of metal micro structure is identical, but its design size is different; Also can be that pattern and design size are all inequality.This can be different according to concrete needs; Irregular saying; All be the result after the Computer Simulation, that is to say that pattern, design size and the spatial arrangement of metal micro structure in the whole ultra material space modulator all obtains through computer is reverse, because the quantity of metal micro structure is huge in the whole ultra material space modulator; If therefore forward design is to be difficult to realize.
A preferred embodiment of the metal micro structure that obtains through Computer Simulation for the present invention shown in Figure 3; Said metal micro structure 2 is the single radial cut straight-flanked ring; Said semiconductor element 3 is attached to the opening part of said single radial cut straight-flanked ring and the two ends of connection opening, and above-mentioned partly leading stopped element 3 and be a kind of or its combination in resistance, inductance or the electric capacity.The said semiconductor element in preferential choosing ground 3 is for to be attached to the SMD variable capacitance on the metal micro structure, is carried in not of uniform size kind of voltage signal at SMD variable capacitance two ends, and capacitance can be ensued change.The change of capacitance; Then changed and the electromagnetic parameter of corresponding that metal micro structure present position of SMD variable capacitance (electric capacity change corresponding be the change of dielectric constant); Can regulate the electromagnetic parameter of all metal micro structure present positions through regulating the plurality of voltages signal; Thereby realized ultra material real between the whole electromagnetic parameter of modulator distribute adjustable (being that refractive index is adjustable), i.e. metal micro structure self response frequency scalable, the adjusting of metal micro structure self response frequency then can influence the frequency through its carrier wave; The frequency of carrier wave is a vector; It comprises amplitude and phase place, therefore is actually and has accomplished amplitude modulation and phase modulation, thereby with being loaded on the carrier wave in the analog voltage signal.Particularly; Every electromagnetic parameter is all adjustable in the ultra material space; And then (resonance point as if a certain metal micro structure is identical with the frequency of carrier wave, and then electromagnetic wave can not pass through this metal micro structure to realize control to amplitude with the phase place of carrier wave through the resonance point frequency that changes each metal micro structure; Otherwise if the frequency of the resonance point of a certain metal micro structure and carrier wave is inequality, then electromagnetic wave can pass through this metal micro structure), in addition, amplitude modulation and phase modulation are combined can realize any modulation.
Fig. 4 be structure shown in Figure 3 on plate shape substrates 11 layout viewing, should be understood that this is a signal, the shape of metal micro structure 2, quantity and spatial arrangement are not limited to this.Wherein, be the stacking direction of plate shape substrates perpendicular to the direction of paper.Among Fig. 4, draw for ease in addition, omitted lead 4.
Combine accompanying drawing that embodiments of the invention are described above; But the present invention is not limited to above-mentioned embodiment, and above-mentioned embodiment only is schematically, rather than restrictive; Those of ordinary skill in the art is under enlightenment of the present invention; Not breaking away under the scope situation that aim of the present invention and claim protect, also can make a lot of forms, these all belong within the protection of the present invention.
Claims (16)
1. transmitter based on the CDMA standard; It is characterized in that; Said transmitter comprises carrier generator, power amplifier, carrier transmit antenna, communication traffic data stream interface, digital signal processing module, digital to analog converter and ultra material space modulator, wherein:
Said carrier generator is used to produce carrier wave;
Said power amplifier, the frequency of the carrier signal that is used for carrier generator is produced is amplified to the requirement that meets tranmitting frequency;
Said carrier transmit antenna is used for the electromagnetic wave to the carrier wave frequency range of spatial emission after power amplifier amplifies;
Said communication traffic data stream interface is used to obtain the digital information flow of the data that various communication traffics produce, and with the transfer of data that obtains to digital signal processing module;
Said digital signal processing module carries out preliminary treatment to input data wherein;
Said digital to analog converter, the digital signal that will import data wherein into changes into analog voltage signal and outputs to ultra material space modulator;
Said ultra material space modulator is modulated to said analog voltage signal on the carrier signal, and sends the electromagnetic wave of modulating out with the CDMA standard modulation system corresponding to electromagnetic wave that has the communication traffic traffic flow information that transmits.
2. the transmitter based on the CDMA standard according to claim 1 is characterized in that, said communication traffic comprises voice messaging communication traffic, data communication business, short message communication traffic and digital broadcasting communication traffic.
3. the transmitter based on the CDMA standard according to claim 1 is characterized in that said preliminary treatment comprises chnnel coding, source encoding and encryption.
4. the transmitter based on the CDMA standard according to claim 1 is characterized in that, said power amplifier is the arrowband power amplifier.
5. the transmitter based on the CDMA standard according to claim 1 is characterized in that, said carrier generator is the microlock source.
6. the transmitter based on the CDMA standard according to claim 1 is characterized in that, said digital signal processing module is FPGA, ASIC special digital chip or dsp chip.
7. the transmitter based on the CDMA standard according to claim 1; It is characterized in that; Said ultra material space modulator comprises base material and is arranged on a plurality of metal micro structures on the base material; All be provided with semiconductor element on each metal micro structure, all semiconductor elements all are electrically connected with digital to analog converter through lead, so that analog voltage signal is loaded on each semiconductor element.
8. the transmitter based on the CDMA standard according to claim 7 is characterized in that, said semiconductor element is resistance, inductance or electric capacity.
9. described transmitter based on the CDMA standard according to claim 7 is characterized in that said semiconductor element is attached on the metal micro structure.
10. described transmitter based on the CDMA standard according to claim 9 is characterized in that, said semiconductor element is the SMD variable capacitance that is attached on the metal micro structure.
11. described transmitter according to claim 7 based on the CDMA standard; It is characterized in that, said metal micro structure for through etching, plating, brill quarter, photoetching, electronics is carved or ion is carved method attached to the metal wire on the plate shape substrates with specific pattern.
12. described transmitter based on the CDMA standard according to claim 11, said metal micro structure is the single radial cut straight-flanked ring, and said semiconductor element is attached to the opening part of said single radial cut straight-flanked ring and the two ends of connection opening.
13. described transmitter based on the CDMA standard according to claim 7 is characterized in that, said metal wire is copper cash or silver-colored line.
14. described transmitter based on the CDMA standard according to claim 7 is characterized in that, said base material is piled up by a plurality of plate shape substrates and forms, and all is attached with a plurality of metal micro structures on each plate shape substrates.
15. described transmitter based on the CDMA standard according to claim 13 is characterized in that said plate shape substrates is made by ceramic material, epoxy resin or polytetrafluoroethylene.
16. described transmitter based on the CDMA standard according to claim 7 is characterized in that, said carrier wave separated before not getting into ultra material space modulator with analog voltage signal.
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| CN201110060709.7A CN102684711B (en) | 2011-03-15 | 2011-03-15 | Based on the transmitter of CDMA standard |
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| CN201110060709.7A CN102684711B (en) | 2011-03-15 | 2011-03-15 | Based on the transmitter of CDMA standard |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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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 |
| CN108377139A (en) * | 2018-01-30 | 2018-08-07 | 广东欧珀移动通信有限公司 | Electronic device |
| CN112217528A (en) * | 2020-10-12 | 2021-01-12 | 维沃移动通信有限公司 | Transmitter, communication system, and electronic device |
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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 |
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| CN108377139B (en) * | 2018-01-30 | 2021-09-14 | Oppo广东移动通信有限公司 | Electronic device |
| CN112217528A (en) * | 2020-10-12 | 2021-01-12 | 维沃移动通信有限公司 | Transmitter, communication system, and 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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| CN102684711B (en) | 2015-10-28 |
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