CN104506220A - Communication method for wireless receiving and transmitting system based on long-term evolution (LTE) - Google Patents
Communication method for wireless receiving and transmitting system based on long-term evolution (LTE) Download PDFInfo
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- H—ELECTRICITY
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- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
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Abstract
The invention discloses a communication method for a wireless receiving and transmitting system based on long-term evolution (LTE). The system comprises an LTE transmitting unit and an LTE receiving unit, wherein the LTE transmitting unit comprises a signal source modulator, a first frequency converter, a first digital synthesizer, a first phase-locked loop synthesizer, a transmitting radiofrequency front end and a first MIMO (Multiple Input Multiple Output) antenna array; the LTE receiving unit comprises a second MIMO antenna array, a receiving radiofrequency front end, a second frequency converter, a third frequency converter, a second phase-locked ring synthesizer, a second digital synthesizer, a medium-frequency filter, an AD (Analog to Digital) converter and a signal source revolving unit. A two-layer frequency spectrum expansion mechanism is adopted, and different expansion sequences can be adopted in each layer of expansion, so that the frequency spectrum of a whole communication system is extended greatly, and the security and interference resistance of the system are enhanced.
Description
Technical field
The present invention relates to wireless communication field, particularly relate to a kind of communication means of the wireless transceiver system based on Long Term Evolution.
Background technology
LTE (Long Term Evolution) is the Long Term Evolution of UMTS (universal mobile telecommunications system) technical standard organized to set up by 3GPP (third generation partner program), in December, 2004 formally sets up the project and starts in the TSGRAN#26 meeting of 3GPP Toronto.LTE system introduces the critical transmissions technology such as OFDM (OFDM) and MIMO (multiple-input and multiple-output), (20M bandwidth 2X2MIMO is in 64QAM situation to significantly increase spectrum efficiency and message transmission rate, theoretical descending peak transfer rate is 201Mbps, be probably 140Mbps after removing signaling consumption, but according to actual networking and terminal capability restriction, it is generally acknowledged that downlink peak rates is 100Mbps, upper behavior 50Mbps), and support that various bandwidth is distributed: 1.4MHz, 3MHz, 5MHz, 10MHz, 15MHz and 20MHz etc., and support global main flow 2G/3G frequency range and some newly-increased frequency ranges, thus spectrum allocation may is more flexible, power system capacity and covering also significantly promote.The LTE system network architecture more flattening is simplified, and decreases network node and system complexity, thus reduces Time Delay of Systems, also reduce network design and maintenance cost.LTE system is supported and other 3GPP interoperability of system.LTE system has two kinds of standard: FDD-LTE and TDD-LTE, i.e. Frequency Division Duplexing (FDD) LTE system and time division duplex LTE system, and the main distinction of the two technology is in the physical layer of air interface (picture frame structure, time-division design, synchronous etc.).FDD-LTE system eat dishes without rice or wine downstream transmission adopt a pair symmetry UHF band reception and send data, TDD-LTE system up-downgoing then uses identical frequency range to transmit on different time slots, and relative to FDD duplex mode, TDD has the higher availability of frequency spectrum.
The spread spectrum mode that LTE system adopts mainly comprises the modulation extended mode based on narrowband modulation technology and the modulation extended mode based on pseudo random sequence and phase shift keying, wherein, modulation extended mode strong security based on narrowband modulation technology, but anti-multipath jamming ability is weak, easily interference is caused to other users, modulation extended mode based on pseudo random sequence and phase shift keying is along with the increase of sequence length, antijamming capability also can increase, but the increase of sequence length can reduce data transmission rate again, therefore, how to coordinate and compensate different modulation extended modes to seem particularly important.
Summary of the invention
The object of the invention is to be achieved through the following technical solutions.
According to the embodiment of the present invention, propose a kind of communication means of the wireless transceiver system based on Long Term Evolution, described system comprises LTE transmitter unit and LTE receiving element, and described LTE transmitter unit comprises information source modulator, first frequency converter, the first Digital Frequency Synthesizer, the first phase-locked loop synthesizer, launches radio-frequency front-end and the first mimo antenna array; Described LTE receiving element comprises the second mimo antenna array, receiving radio frequency front end, second frequency converter, the 3rd frequency changer, the second phase-locked loop synthesizer, the second Digital Frequency Synthesizer, intermediate-frequency filter, AD converter and information source resolution unit; It is characterized in that, described method comprises the steps:
S1:LTE transmitter unit information source modulator obtains digital source spread signal after carrying out the expansion of pseudo-random phase shifts keying to transmission data;
S2:LTE transmitter unit first Digital Frequency Synthesizer is carried out narrow band carrier modulation to described digital source spread signal and is obtained simulation narrowband modulation intermediate-freuqncy signal;
S3:LTE transmitter unit first phase-locked loop synthesizer and first frequency converter are upwards moved described simulation narrowband modulation IF signal frequency and are obtained narrowband modulation radiofrequency signal;
S4:LTE transmitter unit is launched radio-frequency front-end and is carried out radio frequency processing to described narrowband modulation radiofrequency signal, and sends described narrowband modulation radiofrequency signal by the first mimo antenna array;
S5:LTE receiving element receiving radio frequency front end by narrowband modulation radiofrequency signal described in the second mimo antenna array received, and carries out received RF process to described narrowband modulation radiofrequency signal, obtains the narrowband modulation radiofrequency signal of LTE receiving element;
S6:LTE receiving element second phase-locked loop synthesizer and the narrowband modulation radio frequency signal frequency of second frequency converter to LTE receiving element are moved downwards and are obtained narrowband modulation intermediate-freuqncy signal;
S7:LTE receiving element second Digital Frequency Synthesizer and the 3rd frequency changer carry out narrowband demodulation frequency to described narrowband modulation intermediate-freuqncy signal and move the analog if signal being fixed carrier frequency downwards;
S8:LTE receiving element intermediate-frequency filter carries out intermediate frequency filtering process to described analog if signal, and carries out analog to digital conversion by AD converter and obtain digital medium-frequency signal;
Obtain after S9:LTE receiving element information source resolution unit carries out information source parsing to described digital medium-frequency signal exporting data.
According to the embodiment of the present invention, described S1 specifically comprises:
S1-1: homophase pseudo-random phase shifts keying sequence spreading maker and the orthogonal pseudo-random phase shift keying sequence spreading maker of information source modulator produce homophase pseudo-random phase shifts keying sequence spreading and orthogonal pseudo-random phase shift keying sequence spreading respectively;
S1-2: the narrowband modulation sequence generator of information source modulator produces narrowband modulation pseudo random sequence;
S1-3: the multipath conversion unit of information source modulator carries out multipath conversion to transmission data, obtains in-phase data and orthogonal data;
S1-4: the pseudo-random phase shifts keying expansion despread unit of information source modulator utilizes described homophase pseudo-random phase shifts keying sequence spreading and orthogonal pseudo-random phase shift keying sequence spreading to carry out the expansion of homophase phase shift keying and Quadrature Phase Shift Keying expansion respectively to in-phase data and orthogonal data, obtains in-phase digital extension of information source signal and orthogonal digital extension of information source signal.
According to the embodiment of the present invention, described S2 specifically comprises:
The phase shift keying modulating unit of the S2-1: the first Digital Frequency Synthesizer carries out phase shift keying modulation respectively to described in-phase digital extension of information source signal and orthogonal digital extension of information source signal;
The narrowband modulation unit of the S2-2: the first Digital Frequency Synthesizer, under the control of narrowband modulation control command, carries out modulation to narrowband carrier and obtains simulation narrowband modulation intermediate-freuqncy signal.
According to the embodiment of the present invention, described S4 specifically comprises:
S4-1: the first band pass filter launching radio-frequency front-end carries out Channel assignment filtering to described narrowband modulation radiofrequency signal;
S4-2: the radio frequency amplifier launching radio-frequency front-end carries out radio-frequency power amplification to filtered narrowband modulation radiofrequency signal, and send the narrowband modulation radiofrequency signal after amplifying by the first mimo antenna array.
According to the embodiment of the present invention, described S5 specifically comprises:
S5-1: the second band pass filter of receiving radio frequency front end is with logical Choose filtering to the narrowband modulation radiofrequency signal after the radio frequency processing of the second mimo antenna array received;
S5-2: the low noise amplifier of receiving radio frequency front end carries out power amplification to the signal that described second band pass filter exports.
According to the embodiment of the present invention, described S8 specifically comprises:
S8-1: the low pass filter of intermediate-frequency filter carries out low-pass filtering to described analog if signal;
S8-2: the variable gain amplifier of intermediate-frequency filter carries out variable gain to the signal that described low pass filter exports and amplifies the analog if signal obtaining power invariability;
S8-3: the AD converter of intermediate-frequency filter is carried out analog-to-digital conversion to described analog if signal and obtained digital medium-frequency signal.
According to the embodiment of the present invention, described S9 specifically comprises:
S9-1: the power detecting unit of information source resolution unit carries out power detection to the digital medium-frequency signal that described AD converter exports, and controls the multiplication factor of described variable gain amplifier;
S9-2: the digital controlled oscillator of information source resolution unit produces local digital carrier wave and exports carrier wave separative element to, and carries out carrier wave separation to the digital medium-frequency signal that described AD converter exports;
S9-3: homophase pseudo-random phase shifts keying sequence spreading maker and the orthogonal pseudo-random phase shift keying sequence spreading maker of information source resolution unit produce homophase pseudo-random phase shifts keying sequence spreading and orthogonal pseudo-random phase shift keying sequence spreading respectively, the pseudo-random phase shifts keying expansion despread unit of information source resolution unit utilizes homophase pseudo-random phase shifts keying sequence spreading and orthogonal pseudo-random phase shift keying sequence spreading to carry out pseudo-random phase shifts keying expansion despreading to the signal that carrier wave separative element exports, and obtains in-phase data and orthogonal data;
S9-4: the data demodulation unit of information source resolution unit carries out demodulation to described in-phase data and orthogonal data;
S9-5: obtain after the second multipath conversion unit of information source resolution unit carries out parallel serial conversion to the in-phase data after demodulation and orthogonal data exporting data.
Wireless transceiver system based on Long Term Evolution of the present invention and communication means, have employed two-layer spread spectrum mechanism, and every one deck expansion can adopt different sequence spreadings, greatly extend the frequency spectrum of whole communication system, improve confidentiality and the antijamming capability of system.
Accompanying drawing explanation
By reading hereafter detailed description of the preferred embodiment, various other advantage and benefit will become cheer and bright for those of ordinary skill in the art.Accompanying drawing only for illustrating the object of preferred implementation, and does not think limitation of the present invention.And in whole accompanying drawing, represent identical parts by identical reference symbol.In the accompanying drawings:
Figure 1 show the wireless transceiver system structural representation based on Long Term Evolution according to embodiment of the present invention;
Figure 2 illustrate the information source modulator structure schematic diagram according to embodiment of the present invention;
Figure 3 show the radio frequency amplifier structural representation according to embodiment of the present invention;
Fig. 4 illustrate the information source resolution unit structural representation according to embodiment of the present invention;
Fig. 5 illustrate the communication means flow chart of the wireless transceiver system based on Long Term Evolution according to embodiment of the present invention.
Embodiment
Below with reference to accompanying drawings illustrative embodiments of the present disclosure is described in more detail.Although show illustrative embodiments of the present disclosure in accompanying drawing, however should be appreciated that can realize the disclosure in a variety of manners and not should limit by the execution mode of setting forth here.On the contrary, provide these execution modes to be in order to more thoroughly the disclosure can be understood, and complete for the scope of the present disclosure can be conveyed to those skilled in the art.
According to the embodiment of the present invention, propose a kind of wireless transceiver system based on Long Term Evolution, as shown in Figure 1, comprise LTE transmitter unit and LTE receiving element, described LTE transmitter unit comprises information source modulator, first frequency converter, the first Digital Frequency Synthesizer, the first phase-locked loop synthesizer, launches radio-frequency front-end and the first mimo antenna array; Described LTE receiving element comprises the second mimo antenna array, receiving radio frequency front end, second frequency converter, the 3rd frequency changer, the second phase-locked loop synthesizer, the second Digital Frequency Synthesizer, intermediate-frequency filter, AD converter and information source resolution unit;
Described information source modulator, obtains digital source spread signal after carrying out the expansion of pseudo-random phase shifts keying to transmission data;
Described first Digital Frequency Synthesizer, obtains simulation narrowband modulation intermediate-freuqncy signal for carrying out narrow band carrier modulation to described digital source spread signal;
Described first phase-locked loop synthesizer and first frequency converter, obtain narrowband modulation radiofrequency signal for upwards moving described simulation narrowband modulation IF signal frequency;
Described transmitting radio-frequency front-end, for carrying out radio frequency processing to described narrowband modulation radiofrequency signal, and sends the narrowband modulation radiofrequency signal after radio frequency processing by described first mimo antenna array;
Described receiving radio frequency front end, for the narrowband modulation radiofrequency signal by launching radio-frequency front-end transmission described in described second mimo antenna array received, and carrying out received RF process, obtaining the narrowband modulation radiofrequency signal of LTE receiving element;
Described second phase-locked loop synthesizer and second frequency converter, obtain narrowband modulation intermediate-freuqncy signal for moving the narrowband modulation radio frequency signal frequency of LTE receiving element downwards;
Described second Digital Frequency Synthesizer and the 3rd frequency changer, move for carrying out narrowband demodulation frequency to described narrowband modulation intermediate-freuqncy signal the analog if signal being fixed carrier frequency downwards;
Described intermediate-frequency filter, for carrying out intermediate frequency filtering process to described analog if signal;
Described AD converter, obtains digital medium-frequency signal for the conversion of carrying out simulating numeral to described analog if signal;
Described information source resolution unit, obtains exporting data after carrying out information source parsing to described digital medium-frequency signal.
According to the embodiment of the present invention, as shown in Figure 2, described information source modulator comprises homophase pseudo-random phase shifts keying sequence spreading maker, orthogonal pseudo-random phase shift keying sequence spreading maker, the first multipath conversion unit, pseudo-random phase shifts keying expanding element, Wave beam forming filter, narrowband modulation sequence generator and narrowband modulation control command maker;
Described homophase pseudo-random phase shifts keying sequence spreading maker and orthogonal pseudo-random phase shift keying sequence spreading maker are respectively used to produce homophase pseudo-random phase shifts keying sequence spreading and orthogonal pseudo-random phase shift keying sequence spreading;
Described narrowband modulation sequence generator, for generation of narrowband modulation pseudo random sequence;
Described first multipath conversion unit, is separated with orthogonal data with the in-phase data realizing transmitting data to multipath conversion for carrying out single channel to data;
Described pseudo-random phase shifts keying expanding element, for utilizing described homophase pseudo-random phase shifts keying sequence spreading and orthogonal pseudo-random phase shift keying sequence spreading to carry out the expansion of homophase phase shift keying and Quadrature Phase Shift Keying expansion respectively to in-phase data and orthogonal data, obtain in-phase digital extension of information source signal and orthogonal digital extension of information source signal;
Described Wave beam forming filter, for carrying out Wave beam forming filtering to described in-phase digital extension of information source signal and orthogonal digital extension of information source signal;
Described narrowband modulation control command maker, for producing corresponding narrowband modulation control command according to described narrowband modulation pseudo random sequence.
According to the embodiment of the present invention, described first Digital Frequency Synthesizer comprises narrowband modulation unit and phase shift keying modulating unit;
Described phase shift keying modulating unit, for carrying out phase shift keying modulation respectively to described in-phase digital extension of information source signal and orthogonal digital extension of information source signal;
Described narrowband modulation unit, the modulation for realizing narrowband carrier under the control of described narrowband modulation control command obtains simulation narrowband modulation intermediate-freuqncy signal.
According to the embodiment of the present invention, described transmitting radio-frequency front-end comprises the first band pass filter and radio frequency amplifier;
Described first band pass filter, for carrying out Channel assignment filtering to described narrowband modulation radiofrequency signal;
Described radio frequency amplifier, for carrying out radio-frequency power amplification to filtered narrowband modulation radiofrequency signal.
According to the preferred embodiment of the present invention, as shown in Figure 3, described radio frequency amplifier is specifically made up of the input matching circuit of connecting successively, first order amplifying circuit, second level amplifying circuit, third level amplifying circuit; Input matching circuit is made up of inductance L 4, inductance L 5, electric capacity C8, electric capacity C9; First order amplifying circuit is made up of diode D3, diode D4, triode M1, triode M2, inductance L 6, inductance L 7, electric capacity C10 and the first external power supply VDD1; Second level amplifying circuit is made up of resistance R4, resistance R5, triode M3, triode M4, triode M5, triode M6, triode M7, electric capacity C11, electric capacity C12 and the second external power supply VDD2; Third level amplifying circuit is made up of resistance R6, resistance R7, triode M8, triode M9, triode M10, electric capacity C13;
The structure of each circuit is as follows successively:
Input matching circuit is made up of inductance L 4, inductance L 5, electric capacity C8 and electric capacity C9; Wherein, the signal input part of electric capacity C8 is connected with one end of inductance L 4, the other end ground connection of inductance L 4, and the two ends of inductance L 4 are parallel with electric capacity C9; The signal output part of electric capacity C8 is connected with one end of inductance L 5, and the other end of inductance L 5 is connected with the input of first order amplifying circuit; The signal input part of electric capacity C8 is connected with outside antenna;
First order amplifying circuit is made up of diode D3, diode D4, triode M1, triode M2, inductance L 6, inductance L 7, electric capacity C10 and the first external power supply VDD1; Wherein, the output of match circuit, the other end of inductance L 5 is connected with the base stage of the positive pole of diode D3, the negative pole of diode D4 and triode M2 respectively; Inductance L 6 is in series with between the negative pole of diode D3 and the collector electrode of triode M1; The emitter of triode M1 is connected with the collector electrode of triode M2; The emitter of triode M2 is connected with the positive pole of diode D4, and the node between diode D4 positive pole with triode M2 emitter is connected with one end of inductance L 7, the other end ground connection of inductance L 7; The negative pole of diode D3 is connected with the first external power supply VDD1 with the node between inductance L 6; Node between inductance L 6 and the collector electrode of triode M1 is connected with one end of electric capacity C10;
Second level amplifying circuit is made up of resistance R4, resistance R5, triode M3, triode M4, triode M5, triode M6, triode M7, electric capacity C11, electric capacity C12 and the second external power supply VDD2; Wherein, the other end of electric capacity C10 is connected with the base stage of triode M4; The emitter of triode M4 is connected with the emitter of triode M6, the collector electrode of triode M4 is connected with the emitter of triode M3, the base stage of triode M3 is connected with the base stage of triode M5, the emitter of triode M5 is connected with the collector electrode of triode M6, is in series with electric capacity C11 between the node between triode M4 collector electrode and triode M3 emitter and the base stage of triode M6; Node between triode M4 emitter with triode M6 emitter is connected with the collector electrode of triode M7, the grounded emitter of triode M7, and the base stage of triode M7 meets 0,8V; Resistance R4 and resistance R5 is in series with successively between triode M3 collector electrode and triode M5 collector electrode; Node between resistance R4 and resistance R5 is connected with the second external power supply VDD2; Triode M3 collector electrode is connected with one end of electric capacity C12 with the node between resistance R4;
Third level amplifying circuit is made up of resistance R6, resistance R7, triode M8, triode M9, triode M10, electric capacity C13; Wherein, the other end of electric capacity C12 is connected with the base stage of triode M8, the emitter of triode M8 is connected with the emitter of triode M9, node between triode M8 emitter with triode M9 emitter is connected with the collector electrode of triode M10, the grounded emitter of triode M10, the base stage of triode M10 meets 0.8V; Resistance R6 and resistance R7 is in series with successively between the collector electrode of triode M8 and the collector electrode of triode M9; Node between resistance R6 and resistance R7 is connected with the node between resistance R4 and resistance R5; Electric capacity C13 is in series with between the base stage of the node between triode M5 collector electrode and resistance R5 and triode M9.
According to the embodiment of the present invention, described receiving radio frequency front end comprises the second band pass filter and low noise amplifier;
Described second band pass filter, is with logical Choose filtering for the narrowband modulation radiofrequency signal after the radio frequency processing to described second mimo antenna array received;
Described low noise amplifier, carries out power amplification for the signal exported described second band pass filter.
According to the embodiment of the present invention, described intermediate-frequency filter comprises low pass filter and variable gain amplifier;
Described low pass filter, for carrying out low-pass filtering to described analog if signal;
Described variable gain amplifier, the signal for exporting described low pass filter carries out variable gain and amplifies the intermediate-freuqncy signal obtaining power invariability.
According to the embodiment of the present invention, as shown in Figure 4, described information source resolution unit comprises narrowband modulation sequence generator, narrowband modulation control command maker, homophase pseudo-random phase shifts keying sequence spreading maker, orthogonal pseudo-random phase shift keying sequence spreading maker, digital controlled oscillator, the second multipath conversion unit, carrier wave separative element, data demodulation unit, pseudo-random phase shifts keying expansion despread unit and power detecting unit;
Described power detecting unit, the digital medium-frequency signal for exporting described AD converter carries out power detection to control the multiplication factor of intermediate frequency variable gain amplifier;
Described digital controlled oscillator, exports carrier wave separative element to for generation of local digital carrier wave, carries out carrier wave separation with the digital medium-frequency signal exported described AD converter;
Described homophase pseudo-random phase shifts keying sequence spreading maker and orthogonal pseudo-random phase shift keying sequence spreading maker, be respectively used to produce homophase pseudo-random phase shifts keying sequence spreading and orthogonal pseudo-random phase shift keying sequence spreading;
Described pseudo-random phase shifts keying expansion despread unit, for utilizing described homophase pseudo-random phase shifts keying sequence spreading and orthogonal pseudo-random phase shift keying sequence spreading to carry out pseudo-random phase shifts keying expansion despreading to the signal that carrier wave separative element exports, obtain in-phase data and orthogonal data;
Described data demodulation unit, for carrying out demodulation to in-phase data and orthogonal data;
Described second multipath conversion unit, obtains exporting data after the in-phase data after demodulation and orthogonal data being carried out to multichannel to single channel conversion.
According to another embodiment of the present invention, also proposed the communication means of the above-mentioned wireless transceiver system based on Long Term Evolution, as shown in Figure 5, described method comprises:
S1:LTE transmitter unit information source modulator obtains digital source spread signal after carrying out the expansion of pseudo-random phase shifts keying to transmission data;
S2:LTE transmitter unit first Digital Frequency Synthesizer is carried out narrow band carrier modulation to described digital source spread signal and is obtained simulation narrowband modulation intermediate-freuqncy signal;
S3:LTE transmitter unit first phase-locked loop synthesizer and first frequency converter are upwards moved described simulation narrowband modulation IF signal frequency and are obtained narrowband modulation radiofrequency signal;
S4:LTE transmitter unit is launched radio-frequency front-end and is carried out radio frequency processing to described narrowband modulation radiofrequency signal, and sends described narrowband modulation radiofrequency signal by the first mimo antenna array;
S5:LTE receiving element receiving radio frequency front end by narrowband modulation radiofrequency signal described in the second mimo antenna array received, and carries out received RF process to described narrowband modulation radiofrequency signal, obtains the narrowband modulation radiofrequency signal of LTE receiving element;
S6:LTE receiving element second phase-locked loop synthesizer and the narrowband modulation radio frequency signal frequency of second frequency converter to LTE receiving element are moved downwards and are obtained narrowband modulation intermediate-freuqncy signal;
S7:LTE receiving element second Digital Frequency Synthesizer and the 3rd frequency changer carry out narrowband demodulation frequency to described narrowband modulation intermediate-freuqncy signal and move the analog if signal being fixed carrier frequency downwards;
S8:LTE receiving element intermediate-frequency filter carries out intermediate frequency filtering process to described analog if signal, and carries out analog to digital conversion by AD converter and obtain digital medium-frequency signal;
Obtain after S9:LTE receiving element information source resolution unit carries out information source parsing to described digital medium-frequency signal exporting data.
According to the embodiment of the present invention, described S1 specifically comprises:
S1-1: homophase pseudo-random phase shifts keying sequence spreading maker and the orthogonal pseudo-random phase shift keying sequence spreading maker of information source modulator produce homophase pseudo-random phase shifts keying sequence spreading and orthogonal pseudo-random phase shift keying sequence spreading respectively;
S1-2: the narrowband modulation sequence generator of information source modulator produces narrowband modulation pseudo random sequence;
S1-3: the multipath conversion unit of information source modulator carries out multipath conversion to transmission data, obtains in-phase data and orthogonal data;
S1-4: the pseudo-random phase shifts keying expansion despread unit of information source modulator utilizes described homophase pseudo-random phase shifts keying sequence spreading and orthogonal pseudo-random phase shift keying sequence spreading to carry out the expansion of homophase phase shift keying and Quadrature Phase Shift Keying expansion respectively to in-phase data and orthogonal data, obtains in-phase digital extension of information source signal and orthogonal digital extension of information source signal.
According to the embodiment of the present invention, described S2 specifically comprises:
The phase shift keying modulating unit of the S2-1: the first Digital Frequency Synthesizer carries out phase shift keying modulation respectively to described in-phase digital extension of information source signal and orthogonal digital extension of information source signal;
The narrowband modulation unit of the S2-2: the first Digital Frequency Synthesizer, under the control of narrowband modulation control command, carries out modulation to narrowband carrier and obtains simulation narrowband modulation intermediate-freuqncy signal.
According to the embodiment of the present invention, described S4 specifically comprises:
S4-1: the first band pass filter launching radio-frequency front-end carries out Channel assignment filtering to described narrowband modulation radiofrequency signal;
S4-2: the radio frequency amplifier launching radio-frequency front-end carries out radio-frequency power amplification to filtered narrowband modulation radiofrequency signal, and send the narrowband modulation radiofrequency signal after amplifying by the first mimo antenna array.
According to the embodiment of the present invention, described S5 specifically comprises:
S5-1: the second band pass filter of receiving radio frequency front end is with logical Choose filtering to the narrowband modulation radiofrequency signal after the radio frequency processing of the second mimo antenna array received;
S5-2: the low noise amplifier of receiving radio frequency front end carries out power amplification to the signal that described second band pass filter exports.
According to the embodiment of the present invention, described S8 specifically comprises:
S8-1: the low pass filter of intermediate-frequency filter carries out low-pass filtering to described analog if signal;
S8-2: the variable gain amplifier of intermediate-frequency filter carries out variable gain to the signal that described low pass filter exports and amplifies the analog if signal obtaining power invariability;
S8-3: the AD converter of intermediate-frequency filter is carried out analog-to-digital conversion to described analog if signal and obtained digital medium-frequency signal.
According to the embodiment of the present invention, described S9 specifically comprises:
S9-1: the power detecting unit of information source resolution unit carries out power detection to the digital medium-frequency signal that described AD converter exports, and controls the multiplication factor of described variable gain amplifier;
S9-2: the digital controlled oscillator of information source resolution unit produces local digital carrier wave and exports carrier wave separative element to, and carries out carrier wave separation to the digital medium-frequency signal that described AD converter exports;
S9-3: homophase pseudo-random phase shifts keying sequence spreading maker and the orthogonal pseudo-random phase shift keying sequence spreading maker of information source resolution unit produce homophase pseudo-random phase shifts keying sequence spreading and orthogonal pseudo-random phase shift keying sequence spreading respectively, the pseudo-random phase shifts keying expansion despread unit of information source resolution unit utilizes homophase pseudo-random phase shifts keying sequence spreading and orthogonal pseudo-random phase shift keying sequence spreading to carry out pseudo-random phase shifts keying expansion despreading to the signal that carrier wave separative element exports, and obtains in-phase data and orthogonal data;
S9-4: the data demodulation unit of information source resolution unit carries out demodulation to described in-phase data and orthogonal data;
S9-5: obtain after the second multipath conversion unit of information source resolution unit carries out parallel serial conversion to the in-phase data after demodulation and orthogonal data exporting data.
The above; be only the present invention's preferably embodiment, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should described be as the criterion with the protection range of claim.
Claims (7)
1. the communication means based on the wireless transceiver system of Long Term Evolution, described system comprises LTE transmitter unit and LTE receiving element, and described LTE transmitter unit comprises information source modulator, first frequency converter, the first Digital Frequency Synthesizer, the first phase-locked loop synthesizer, launches radio-frequency front-end and the first mimo antenna array; Described LTE receiving element comprises the second mimo antenna array, receiving radio frequency front end, second frequency converter, the 3rd frequency changer, the second phase-locked loop synthesizer, the second Digital Frequency Synthesizer, intermediate-frequency filter, AD converter and information source resolution unit; It is characterized in that, described method comprises the steps:
S1:LTE transmitter unit information source modulator obtains digital source spread signal after carrying out the expansion of pseudo-random phase shifts keying to transmission data;
S2:LTE transmitter unit first Digital Frequency Synthesizer is carried out narrow band carrier modulation to described digital source spread signal and is obtained simulation narrowband modulation intermediate-freuqncy signal;
S3:LTE transmitter unit first phase-locked loop synthesizer and first frequency converter are upwards moved described simulation narrowband modulation IF signal frequency and are obtained narrowband modulation radiofrequency signal;
S4:LTE transmitter unit is launched radio-frequency front-end and is carried out radio frequency processing to described narrowband modulation radiofrequency signal, and sends described narrowband modulation radiofrequency signal by the first mimo antenna array;
S5:LTE receiving element receiving radio frequency front end by narrowband modulation radiofrequency signal described in the second mimo antenna array received, and carries out received RF process to described narrowband modulation radiofrequency signal, obtains the narrowband modulation radiofrequency signal of LTE receiving element;
S6:LTE receiving element second phase-locked loop synthesizer and the narrowband modulation radio frequency signal frequency of second frequency converter to LTE receiving element are moved downwards and are obtained narrowband modulation intermediate-freuqncy signal;
S7:LTE receiving element second Digital Frequency Synthesizer and the 3rd frequency changer carry out narrowband demodulation frequency to described narrowband modulation intermediate-freuqncy signal and move the analog if signal being fixed carrier frequency downwards;
S8:LTE receiving element intermediate-frequency filter carries out intermediate frequency filtering process to described analog if signal, and carries out analog to digital conversion by AD converter and obtain digital medium-frequency signal;
Obtain after S9:LTE receiving element information source resolution unit carries out information source parsing to described digital medium-frequency signal exporting data.
2. a method of claim 1, described S1 specifically comprises:
S1-1: homophase pseudo-random phase shifts keying sequence spreading maker and the orthogonal pseudo-random phase shift keying sequence spreading maker of information source modulator produce homophase pseudo-random phase shifts keying sequence spreading and orthogonal pseudo-random phase shift keying sequence spreading respectively;
S1-2: the narrowband modulation sequence generator of information source modulator produces narrowband modulation pseudo random sequence;
S1-3: the multipath conversion unit of information source modulator carries out multipath conversion to transmission data, obtains in-phase data and orthogonal data;
S1-4: the pseudo-random phase shifts keying expansion despread unit of information source modulator utilizes described homophase pseudo-random phase shifts keying sequence spreading and orthogonal pseudo-random phase shift keying sequence spreading to carry out the expansion of homophase phase shift keying and Quadrature Phase Shift Keying expansion respectively to in-phase data and orthogonal data, obtains in-phase digital extension of information source signal and orthogonal digital extension of information source signal.
3. a method as claimed in claim 2, described S2 specifically comprises:
The phase shift keying modulating unit of the S2-1: the first Digital Frequency Synthesizer carries out phase shift keying modulation respectively to described in-phase digital extension of information source signal and orthogonal digital extension of information source signal;
The narrowband modulation unit of the S2-2: the first Digital Frequency Synthesizer, under the control of narrowband modulation control command, carries out modulation to narrowband carrier and obtains simulation narrowband modulation intermediate-freuqncy signal.
4. a method as claimed in claim 3, described S4 specifically comprises:
S4-1: the first band pass filter launching radio-frequency front-end carries out Channel assignment filtering to described narrowband modulation radiofrequency signal;
S4-2: the radio frequency amplifier launching radio-frequency front-end carries out radio-frequency power amplification to filtered narrowband modulation radiofrequency signal, and send the narrowband modulation radiofrequency signal after amplifying by the first mimo antenna array.
5. a method as claimed in claim 4, described S5 specifically comprises:
S5-1: the second band pass filter of receiving radio frequency front end is with logical Choose filtering to the narrowband modulation radiofrequency signal after the radio frequency processing of the second mimo antenna array received;
S5-2: the low noise amplifier of receiving radio frequency front end carries out power amplification to the signal that described second band pass filter exports.
6. a method as claimed in claim 5, described S8 specifically comprises:
S8-1: the low pass filter of intermediate-frequency filter carries out low-pass filtering to described analog if signal;
S8-2: the variable gain amplifier of intermediate-frequency filter carries out variable gain to the signal that described low pass filter exports and amplifies the analog if signal obtaining power invariability;
S8-3: the AD converter of intermediate-frequency filter is carried out analog-to-digital conversion to described analog if signal and obtained digital medium-frequency signal.
7. a method as claimed in claim 6, described S9 specifically comprises:
S9-1: the power detecting unit of information source resolution unit carries out power detection to the digital medium-frequency signal that described AD converter exports, and controls the multiplication factor of described variable gain amplifier;
S9-2: the digital controlled oscillator of information source resolution unit produces local digital carrier wave and exports carrier wave separative element to, and carries out carrier wave separation to the digital medium-frequency signal that described AD converter exports;
S9-3: homophase pseudo-random phase shifts keying sequence spreading maker and the orthogonal pseudo-random phase shift keying sequence spreading maker of information source resolution unit produce homophase pseudo-random phase shifts keying sequence spreading and orthogonal pseudo-random phase shift keying sequence spreading respectively, the pseudo-random phase shifts keying expansion despread unit of information source resolution unit utilizes homophase pseudo-random phase shifts keying sequence spreading and orthogonal pseudo-random phase shift keying sequence spreading to carry out pseudo-random phase shifts keying expansion despreading to the signal that carrier wave separative element exports, and obtains in-phase data and orthogonal data;
S9-4: the data demodulation unit of information source resolution unit carries out demodulation to described in-phase data and orthogonal data;
S9-5: obtain after the second multipath conversion unit of information source resolution unit carries out parallel serial conversion to the in-phase data after demodulation and orthogonal data exporting data.
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