CN101741803A - Multi-band frequency spectrum aggregating wireless transmitter-receiver device - Google Patents
Multi-band frequency spectrum aggregating wireless transmitter-receiver device Download PDFInfo
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Abstract
The invention discloses a multi-band frequency spectrum aggregating wireless transmitter-receiver device which is characterized in that multi-band simulating radio frequency front ends are aggregated; different radio frequencies are divided into 20 MHz and 60 MHz processing frequency bands; analog-to-digital conversion while receiving a base-band signal and digital-to-analogue conversion while sending are performed in low and intermediate frequencies; and a signal treatment relative to a base-band NC-OFDM modulation-demodulation is performed by a sending base-band processing channel and a receiving base-band processing channel which are dynamically arranged. The invention solves the problem that the prior mobile communication terminal cannot work in multi-band at the same time during the communication process and only can use continuous frequency spectrums. The frequency spectrum aggregating function of the transmitter-receiver device realizes a data rate required by an IMT-Advanced system.
Description
Technical field
The invention belongs to the wireless transmission and the reception technique field of digital information transmission, be specifically related in the mobile radio system frequency spectrum fragment on a plurality of frequency ranges be organized the wireless transmitter of realization spectrum aggregating.
Background technology
International senior mobile communication (IMT-Advanced) is the next-generation mobile communications technology of International Telecommunication Union's definition, is the new development of 3G technology, and it comprises the mobile system of the new ability that surmounts IMT-2000.According to ITU-RM.1645 recommendation " following framework and the overall goals of disposing of IMT-2000 and back IMT-2000 system ", the design object of IMT-Advanced system data rates is to be in the data service rate of supporting 1Gbps when static or low speed moves the user; When being in high-speed moving state, the user supports the data service rate of 100Mbps.The WRC (WRC-07) of holding in November, 2007 for the IMT-Advanced system assignment 4 available frequency bands, that is: the 20MHz bandwidth of the 108/174MHz bandwidth of the 100MHz bandwidth of the 200MHz bandwidth of 3.4-3.6GHz, 2.3-2.4GHz, 698-806/862MHz and 450MHz-470MHz.According to the design object of IMT-Advanced system on data rate, user terminal must use above-mentioned 4 frequency ranges just may reach the performance requirement of static 1Gbps, dynamic 100Mbps in communication simultaneously.But because historical reasons, there are partial-band and frequency to be taken on these 4 newly assigned available frequency bands by other system, idle usable spectrum is rendered as fragment shape (being called frequency spectrum fragment), and therefore the frequency spectrum fragment that must adopt new spectrum aggregating technology will be dispersed in a plurality of frequency ranges is organized and transmitted the specification requirement that could realize IMT-Advanced together.
Existing 2G and 3G mobile communication system such as GSM, WCDMA, CDMA2000 and WiMAX use spectrum utilization mode single, continuous frequency range owing to mainly take to concentrate, and can't satisfy the requirement of IMT-Advanced system.These systems generally mark off certain intervals on continuous frequency range fixed frequency band provides data communication service for each or every group of user, and in communication process, the transmitter and receiver of communication terminal can only be operated on a certain fixing frequency range.For example gsm system is generally operational in the radio frequency band of 890MHz or 1800MHz, and radio frequency bandwidth is 200kHz; The WCDMA system is generally operational in the radio frequency band of 2100MHz, and radio frequency bandwidth is 5MHz; The a certain frequency range of the radio frequency of CDMA2000 system in 450MHz, 950MHz, 1900MHz and 2100MHz, radio frequency bandwidth are 3.75MHz (CDMA20003X); The radio frequency bandwidth of WiMAX system is 20MHz to the maximum, and is configurable in the particular job frequency range of 700MHz to the 6GHz.Therefore, present existing mobile communication transceiver system still can't realize the spectrum aggregating of multiband, can not use in the IMT-Advanced system.
Summary of the invention
The objective of the invention is to propose a kind of multi-band frequency spectrum aggregating wireless transmitter-receiver device, utilize the radio-frequency front-end of multiband, modular Base-Band Processing passage and discontinuous orthogonal frequency division multiplexing (NC-OFDM) technology, solve existing mobile communication terminal and in communication process, can't be operated in a plurality of frequency ranges simultaneously, can only use the problem of continuous frequency spectrum, realize the desired data rate of IMT-Advanced system by the spectrum aggregating function that R-T unit had.
Multi-band frequency spectrum aggregating wireless transmitter-receiver device of the present invention, comprise that the radio-frequency front-end processing module links to each other with reception Base-Band Processing passage with a plurality of transmission Base-Band Processing passages respectively, each sends the Base-Band Processing passage and receives the Base-Band Processing passage and is connected to the link protocol processing module; It is characterized in that finishing many group baseband modulation and demodulation respectively by a plurality of transceiver channels with same hardware structure, by the radio-frequency front-end processing module output signal warp of each sendaisle is too much organized frequency mixer and upconvert to different frequency, be spliced to radio frequency band through mixer then, each radio frequency band signal that will receive simultaneously decomposes through power splitter, and, output to each receive path respectively by after many groups frequency mixer down-conversion; Distribution of flows and merging by a plurality of Baseband Channels of link protocol processing modules implement;
Described radio-frequency front-end processing module comprises radiating portion and receiving unit, wherein the class frequency that is input as of radiating portion is the Low Medium Frequency modulation signal of 20MHz-60MHz at 10MHz to 70MHz, bandwidth, and these signals to be transmitted are by digital to analog converter (DAC) output that sends the Base-Band Processing passage; Every road Low Medium Frequency modulation signal amplifies by intermediate frequency amplifier, after band-pass filter, sends into upconverter and is converted to second intermediate frequency again; Wherein the signal of one road 20MHz bandwidth directly upconverts to 450MHz-470MHz, the multichannel intermediate-freuqncy signal is divided into three groups in addition, double conversion is to 208MHz to 400MHz respectively, and three groups of signals are merged into the Wideband Intermediate Frequency signal that three bandwidth are respectively 164MHz, 100MHz and 200MHz through mixer; These three intermediate-freuqncy signals are amplified and filtering through intermediate frequency, upconvert to 698MHz-862MHz, 2300MHz-2400MHz and 3400MHz-3600MHz frequency range more respectively; Transmitting antenna is divided into two groups: wherein launched by same antenna group behind 450MHz-470MHz frequency range and 698MHz-862MHz frequency range radiofrequency signal process mixer and the power amplifier, launched by another group antenna behind 2300MHz-2400MHz and 3400MHz-3600MHz frequency range radiofrequency signal process mixer and the power amplifier;
The receiving unit of described radio-frequency front-end processing module uses two group of received antennas: one group of antenna receives 1GHz following 450MHz-470MHz frequency range and 698MHz-862MHz frequency band signals, and another group antenna receives 2GHz above 2300MHz-2400MHz frequency range and 3400MHz-3600MHz frequency band signals; Wherein the following signal of 1GHz is divided into two-way through behind low noise amplifier, power splitter and the radio-frequency filter: wherein one the tunnel is the 450MHz-470MHz frequency band signals, and another road is the 698MHz-862MHz frequency band signals; The above signal of 2GHz is divided into two-way through behind low noise amplifier (LNA), power splitter and the radio-frequency filter: wherein one the tunnel is the 2300MHz-2400MHz frequency band signals, and another road is the 3400MHz-3600MHz frequency band signals; Above-mentioned 4 tunnel radiofrequency signals are passed through following processing respectively, become the Low Medium Frequency narrow band signal:
For the 450MHz-470MHz frequency band signals: once down-convert to frequency range at the Low Medium Frequency signal of 20MHz,, deliver to and receive the Base-Band Processing passage through intermediate frequency amplifier, filtering and gain controlling (AGC) to 40MHz;
For the 698MHz-862MHz frequency band signals: once downconvert to 200MHz to 400MHz, is the narrowband intermediate frequency signal of 20MHz-60MHz for 2-4 road bandwidth along separate routes through filtering, amplification back by power splitter and filter, be down-converted in the 10MHz-70MHz frequency band then respectively, through filtering, amplification and gain controlling, deliver to the reception Base-Band Processing passage of each road signal;
For the 2300MHz-2400MHz frequency band signals: once be down-converted to 200MHz to 300MHz, is the narrowband intermediate frequency signal of 20MHz-60MHz for 2-3 road bandwidth along separate routes through filtering, amplification back by power splitter and filter, be down-converted in the 10MHz-70MHz frequency band then respectively, through filtering, amplification and gain controlling, deliver to the reception Base-Band Processing passage of each road signal;
For the 3400MHz-3600MHz frequency band signals: once be down-converted to 200MHz to 400MHz, is the narrowband intermediate frequency signal of 20MHz-60MHz for 3-4 road bandwidth along separate routes through filtering, amplification back by power splitter and filter, be down-converted in the 10MHz-70MHz frequency band then respectively, through filtering, amplification and gain controlling, deliver to the reception Base-Band Processing passage of each road signal;
The processing bandwidth of described transmission Base-Band Processing passage is 20MHz-60MHz, and the baseband modulation mode is discrete OFDM (NC-OFDM); Each sends the Base-Band Processing passage by digital signal processor (DSP), central processing unit (CPU), and field programmable gate array (FPGA), digital up converter (DUC) and digital to analog converter (DAC) are formed; In passage, connect digital up converter (DUC), digital signal processor (DSP) and central processing unit (CPU) by field programmable gate array (FPGA); Finish the discrete OFDM of base band (NC-OFDM) modulation by digital signal processor (DSP), generate the two-way i/q signal: handle data flow tissue, management and the related protocol control that sends between Base-Band Processing passage and the link protocol processing module by central processing unit (CPU); By digital up converter (DUC) discrete OFDM (NC-OFDM) baseband modulation signal is upconverted to first intermediate frequency, output to digital to analog converter (DAC) then and obtain simulating the Low Medium Frequency signal through digital-to-analogue conversion, signal frequency range is that 10MHz is to 70MHz;
Described reception Base-Band Processing passage comprises analog to digital converter (ADC), digital down converter (DDC), digital signal processor (DSP), central processing unit (CPU) and field programmable gate array (FPGA); Field programmable gate array (FPGA) connects digital down converter (DDC), digital signal processor (DSP) and central processing unit (CPU); By analog to digital converter (ADC) each road Low Medium Frequency signal of radio frequency front-end processing module output is sampled and digitlization; Through obtaining I/Q two-way quadrature baseband digital signal behind the digital down converter (DDC); Digital signal processor (DSP) is finished the discrete OFDM of base band (NC-OFDM) demodulation according to two-way I/Q baseband digital signal; Handle data flow tissue, management and the related protocol control that receives between Base-Band Processing passage and the link protocol processing module by central processing unit (CPU);
Described link protocol processing module can be by the modulation parameter of discrete OFDM (NC-OFDM) modulation in the software dynamic-configuration Base-Band Processing passage: comprise the number of sub carrier wave that uses and frequency, the modulation system on each subcarrier etc.; Finish the organization and management of data flow, the data to be transmitted of outside input is assigned to a plurality of transmission Base-Band Processing passages according to the link transmission agreement transmits, and will receive data that the Base-Band Processing passage obtains according to the link transmission agreement and be spliced into the data flow form again and export.
Compare with the WiMAX technology with WCDMA, CDMA2000, because the present invention has adopted the radio-frequency front-end processing module of multiband, therefore transceiver terminal can be simultaneously in the reception and the transmission of the enterprising line data of a plurality of available frequency bands, and each treatment channel has bigger processing bandwidth, thereby overcome prior art and handled narrow bandwidth, the shortcoming that working frequency range is single has obtained higher message transmission rate; A plurality of transmission Base-Band Processing passages among the present invention simultaneously have identical hardware configuration and software processes algorithm respectively with reception Base-Band Processing passage, are convenient to modularized design and production, have good cost advantage.
Description of drawings
Fig. 1 is a multi-band frequency spectrum aggregating wireless transmitter-receiver device system schematic of the present invention.
Fig. 2 handles the emission principle block diagram for radio-frequency front-end
Fig. 3 handles for radio-frequency front-end and receives theory diagram.
Fig. 4 is for sending Base-Band Processing passage block diagram.
Fig. 5 is for receiving Base-Band Processing passage block diagram.
Embodiment
Embodiment 1:
At first provide multi-band frequency spectrum aggregating wireless transmitter-receiver device system schematic of the present invention with Fig. 1; Provide radio-frequency front-end with Fig. 2 and handle the emission principle block diagram; Fig. 3 handles for radio-frequency front-end and receives theory diagram; Fig. 4 is for sending Base-Band Processing passage block diagram; Fig. 5 is for receiving Base-Band Processing passage block diagram.Present embodiment will illustrate 4 frequency ranges utilizing the present invention how to use the IMT-Advanced standard to divide simultaneously by means of Fig. 1, Fig. 2, Fig. 3, Fig. 4 and shown in Figure 5.
As shown in Figure 1: radio-frequency front-end processing module 101 links to each other with a plurality of transmission Base-Band Processing path 10s 3 with a plurality of reception Base-Band Processing path 10s 2, each receives Base-Band Processing path 10 2 and sends Base-Band Processing path 10 3 and link to each other with link protocol processing module 104 respectively with each, thus the formation multi-band frequency spectrum aggregating wireless transmitter-receiver device.
According to the relevant criterion of International Telecommunications Union, the available frequency range respectively of IMT-Advanced is 450MHz-470MHz, 698MHz-862MHz, 2300MHz-2400MHz and 3400MHz-3600MHz.Table 1 has provided a kind of division methods of usable spectrum, is divided into 10 processing frequency band: 450MHz-470MHz altogether and is divided into 1 processing frequency band, and frequency band number is A1 (20MHz); 698MHz-862MHz is divided into 3 frequency bands, and frequency band number is respectively B1 (52MHz), B2 (60MHz) and B3 (52MHz); 2300MHz-2400MHz is divided into 2 frequency bands, and frequency band number is respectively C1 (60MHz) and C2 (40MHz); 3400MHz-3600MHz is divided into 4 frequency bands, and frequency band number is respectively D1 (60MHz), D2 (60MHz), D3 (40MHz) and D4 (40MHz).
The splitting scheme of table 1 usable spectrum
According to the spectrum division scheme shown in the last table, adopt RF transmission method as shown in Figure 2: with 10 tunnel simulation Low Medium Frequency signals of 10 transmitting baseband processing module outputs, in Fig. 2, be labeled as P1～P10 respectively, pass through intermediate frequency amplification, filtering and upconversion process respectively, be combined into 4 radiofrequency signals on the frequency range; To launch by two class antennas respectively with the above two parts of signals of 1GHz below the 1GHz.Wherein:
Obtain frequency range at the 450MHz-470MHz signal after P1 road 20MHz-40MHz signal and the mixing of 490MHz local oscillation signal;
P2 road 18MHz-70MHz signal and the mixing of 190MHz local oscillator obtain the signal of frequency range at 208MHz-260MHz; P3 road 10MHz-70MHz signal and the mixing of 250MHz local oscillation signal obtain the signal of frequency range at 260MHz-320MHz; P4 road 10MHz-62MHz signal and the mixing of 310MHz local oscillation signal obtain the signal of frequency range at 320MHz-372MHz; P2-P4 road signal is merged into the signal of one tunnel frequency range at 208MHz-372MHz through first mixer 201, this signal again with the mixing of 490MHz local oscillator after, upconvert to 698MHz-862MHz, and output to the antenna emission through the 4th mixer 204, power amplifier with the 450MHz-470MHz signal.
P5 road 10MHz-70MHz signal and the mixing of 190MHz local oscillator obtain the signal of frequency range at 200MHz-260MHz; P6 road 10MHz-50MHz signal and the mixing of 250MHz local oscillator obtain frequency range at the 260MHz-300MHz signal; P5, P6 road signal are merged into the signal of one tunnel frequency range at 200MHz-300MHz through second mixer 202, up-convert to the signal of frequency range at 2300MHz-2400MHz with the mixing of 2100MHz local oscillator again.
P7 road 10MHz-70MHz signal and the mixing of 190MHz local oscillator obtain the signal of frequency range at 200MHz-260MHz; P8 road 10MHz-70MHz signal and the mixing of 250MHz local oscillator obtain the signal of frequency range at 260MHz-320MHz; P9 road 10MHz-50MHz signal and the mixing of 310MHz local oscillator obtain the signal of frequency range at 320MHz-360MHz; P10 road 10MHz-50MHz signal and the mixing of 350MHz local oscillator obtain the signal of frequency range at 360MHz-400MHz; P7-P10 road signal is merged into the signal of one tunnel frequency range at 200MHz-400MHz through the 3rd mixer 203, upconvert to 3400MHz-3600MHz with the mixing of 3200MHz local oscillator, and output to the antenna emission through the 5th mixer 205, power amplifier with the signal of 2300MHz-2400MHz.
So just 10 road Low Medium Frequency analog signals are launched via 4 radio frequency bands respectively, realized that the spectrum aggregating of a plurality of frequency ranges uses.
The radio frequency reception programme is as shown in Figure 3: utilize two groups of antennas to receive the following and above signal of 1GHz of 1GHz respectively, wherein the following signal of 1GHz is divided into two-way through the low noise amplifier (LNA) and first power splitter 301, obtains 450MHz-470MHz signal and 698MHz-862MHz signal through filtering respectively.
450MHz-470MHz signal and 490MHz local oscillator mixing down-conversion obtain the Low Medium Frequency signal of frequency range at 20MHz-40MHz, in Fig. 3, be labeled as M1 through gain-controlled amplifier (AGC) as M1 road signal, all the other each road signals output to corresponding reception Base-Band Processing passage by that analogy.
698MHz-862MHz signal and the mixing of 490MHz local oscillator obtain frequency range in the 208MHz-372MHz intermediate-freuqncy signal, this signal is obtained 3 road signals along separate routes through the 3rd power splitter 303, frequency band range is respectively 208MHz-260MHz, 260MHz-320MHz, 320MHz-372MHz; Wherein 208MHz-260MHz signal and the mixing of 190MHz local oscillator obtain the Low Medium Frequency signal of frequency range at 18MHz-70MHz, output to corresponding reception Base-Band Processing passage through gain-controlled amplifier as M2 road signal; 260MHz-320MHz signal and the mixing of 250MHz local oscillator obtain the Low Medium Frequency signal of frequency range at 10MHz-70MHz, output to corresponding reception Base-Band Processing passage through gain-controlled amplifier as M3 road signal; 320MHz-372MHz signal and the mixing of 310MHz local oscillator obtain the Low Medium Frequency signal of frequency range at 10MHz-62MHz, output to corresponding reception Base-Band Processing passage through gain-controlled amplifier as M4 road signal.
The above signal of 1GHz is divided into two-way through the low noise amplifier and second power splitter 302, obtains the signal of frequency range at 2300MHz-2400MHz and 3400MHz-3600MHz through filtering respectively.
2300MHz-2400MHz signal and the mixing of 2100MHz local oscillator obtain the signal of frequency range at 200MHz-300MHz, be divided into two-way through the 4th power splitter 304 again: wherein 200MHz-260MHz signal and the mixing of 190MHz local oscillator obtain 10MHz-70MHz Low Medium Frequency signal, output to corresponding reception Base-Band Processing passage through gain-controlled amplifier as M5 road signal; Another road 260MHz-300MHz signal, mixing obtains being positioned at the Low Medium Frequency signal of 10MHz-50MHz through the 250MHz local oscillation signal, outputs to corresponding reception Base-Band Processing passage through gain-controlled amplifier as M6 road signal.
3400MHz-3600MHz signal and the mixing of 3200MHz local oscillator obtain the signal of frequency range at 200MHz-400MHz, be divided into 4 the tunnel through the 5th power splitter 305 again: wherein 200MHz-260MHz signal and the mixing of 190MHz local oscillator, obtain frequency range at 10MHz-70MHz Low Medium Frequency signal, and then output to corresponding reception Base-Band Processing passage as M7 road signal through gain-controlled amplifier; 260MH-320MHz signal and the mixing of 250MHz local oscillator obtain the Low Medium Frequency signal of frequency range at 10MHz-70MHz, output to corresponding reception Base-Band Processing passage through gain-controlled amplifier as M8 road signal; 320MH-360MHz signal and the mixing of 310MHz local oscillator obtain the Low Medium Frequency signal of frequency range at 10MHz-50MHz, output to corresponding reception Base-Band Processing passage through gain-controlled amplifier as M9 road signal; 360MH-400MHz signal and the mixing of 350MHz local oscillator obtain the Low Medium Frequency signal of frequency range at 10MHz-50MHz, output to corresponding reception Base-Band Processing passage through gain-controlled amplifier as M10 road signal.
Sending the Base-Band Processing passage and receiving the Base-Band Processing passage is that digital mode is handled, adopt the NC-OFDM modulation system, NC-OFDM is the orthogonal frequency division multiplexi on a kind of discontinuous spectrum, can in handling frequency band, use discontinuous subcarrier, realize handling the spectrum aggregating in the frequency band flexibly; As shown in Figure 4, sending the Base-Band Processing passage is made up of DAC, DUC, DSP, CPU and FPGA; Connect DUC, DSP and CPU by FPGA in passage, DUC connects DAC; In sending the Base-Band Processing passage, at first the DSP that is configured in according to the link protocol processing module finishes the NC-OFDM baseband modulation, and then DUC carries out Digital Up Convert, at last by DAC output analog signal to the radio-frequency front-end processing module; As shown in Figure 5, receiving the Base-Band Processing passage is made up of ADC, DDC, DSP, CPU and FPGA; Connect DDC, DSP and CPU by FPGA in passage, ADC connects DDC; The Low Medium Frequency signal through after the ADC conversion, at first carries out Digital Down Convert at DDC in receiving the Base-Band Processing passage, finish the NC-OFDM base band demodulating among the DSP according to being configured in of link protocol processing module then.
This shows that present embodiment has realized that 4 frequency ranges in the IMT-Advanced standard receive and dispatch processing simultaneously, it is big to have the bandwidth of processing, the characteristics that transmission rate is high; It is one group of hardware platform that digital baseband communication signal is handled that in this embodiment 10 tunnel sends the Base-Band Processing passage, but be used for the software radio algoritic module of execution parameter dynamic-configuration, finish different signal modulation process according to the configuration of link protocol processing module; In the embodiment 10 tunnel receives the Base-Band Processing passage and also has same characteristics, this structure has strengthened the configurability and the whole property of dynamic adjustable of whole multi-band frequency spectrum aggregating R-T unit, full digital processing has improved the sensitivity and the handling property of R-T unit, make be structured on this platform communication system its can finish data communication by more effective, the flexible and adaptive frequency spectrum resource that utilizes.
Claims (1)
1. multi-band frequency spectrum aggregating wireless transmitter-receiver device, comprise the radio-frequency front-end processing module, send the Base-Band Processing passage, receive Base-Band Processing passage and link protocol processing module, the radio-frequency front-end processing module links to each other with reception Base-Band Processing passage with a plurality of transmission Base-Band Processing passages respectively, and each sends the Base-Band Processing passage and receive the Base-Band Processing passage and is connected to the link protocol processing module; It is characterized in that finishing many group baseband modulation and demodulation respectively by a plurality of transceiver channels with same hardware structure, by the transmission part of radio-frequency front-end processing module the output signal warp of each sendaisle is too much organized frequency mixer and upconvert to different frequency, be spliced to radio frequency band through mixer then, each radio frequency band signal that the receiving unit of while radio-frequency front-end processing module will receive decomposes through power splitter, and by outputing to each receive path respectively after many groups frequency mixer down-conversion; Distribution of flows and merging by a plurality of Baseband Channels of link protocol processing modules implement;
Described radio-frequency front-end processing module comprises radiating portion and receiving unit, wherein the class frequency that is input as of radiating portion is the Low Medium Frequency modulation signal of 20MHz-60MHz at 10MHz to 70MHz, bandwidth, and these signals to be transmitted are by the digital to analog converter output that sends the Base-Band Processing passage; Every road Low Medium Frequency modulation signal amplifies by intermediate frequency amplifier, after band-pass filter, sends into upconverter and is converted to second intermediate frequency again; Wherein the signal of one road 20MHz bandwidth directly upconverts to 450MHz-470MHz, the multichannel intermediate-freuqncy signal is divided into three groups in addition, double conversion is to 208MHz to 400MHz respectively, and three groups of signals are merged into the Wideband Intermediate Frequency signal that three bandwidth are respectively 164MHz, 100MHz and 200MHz through mixer; These three intermediate-freuqncy signals are amplified and filtering through intermediate frequency, upconvert to 698MHz-862MHz, 2300MHz-2400MHz and 3400MHz-3600MHz frequency range more respectively; Transmitting antenna is divided into two groups: wherein launched by same antenna group behind 450MHz-470MHz frequency range and 698MHz-862MHz frequency range radiofrequency signal process mixer and the power amplifier, launched by another group antenna behind 2300MHz-2400MHz and 3400MHz-3600MHz frequency range radiofrequency signal process mixer and the power amplifier;
The receiving unit of described radio-frequency front-end processing module uses two group of received antennas: one group of antenna receives 1GHz following 450MHz-470MHz frequency range and 698MHz-862MHz frequency band signals, and another group antenna receives 2GHz above 2300MHz-2400MHz frequency range and 3400MHz-3600MHz frequency band signals; Wherein the following signal of 1GHz is divided into two-way through behind low noise amplifier, power splitter and the radio-frequency filter: wherein one the tunnel is the 450MHz-470MHz frequency band signals, and another road is the 698MHz-862MHz frequency band signals; The above signal of 2GHz is divided into two-way through behind low noise amplifier, power splitter and the radio-frequency filter: wherein one the tunnel is the 2300MHz-2400MHz frequency band signals, and another road is the 3400MHz-3600MHz frequency band signals; Above-mentioned 4 tunnel radiofrequency signals adopt following processing method respectively, become the Low Medium Frequency narrow band signal:
For the 450MHz-470MHz frequency band signals: once down-convert to the Low Medium Frequency signal of 20MHz,, deliver to and receive the Base-Band Processing passage through filtering, amplification and gain controlling to 40MHz;
For the 698MHz-862MHz frequency band signals: once be down-converted to 200MHz to 400MHz, is the narrowband intermediate frequency signal of 20MHz-60MHz for 2-4 road bandwidth along separate routes through filtering, amplification back by power splitter and filter, be down-converted in the 10MHz-70MHz frequency band then respectively, through filtering, amplification and gain controlling, deliver to the reception Base-Band Processing passage of each road signal;
For the 2300MHz-2400MHz frequency band signals: once be down-converted to 200MHz to 300MHz, is the narrowband intermediate frequency signal of 20MHz-60MHz for 2-3 road bandwidth along separate routes through filtering, amplification back by power splitter and filter, be down-converted in the 10MHz-70MHz frequency band then respectively, through filtering, amplification and gain controlling, deliver to the reception Base-Band Processing passage of each road signal;
For the 3400MHz-3600MHz frequency band signals: once be down-converted to 200MHz to 400MHz, is the narrowband intermediate frequency signal of 20MHz-60MHz for 3-4 road bandwidth along separate routes through filtering, amplification back by power splitter and filter, be down-converted in the 10MHz-70MHz frequency band then respectively, through filtering, amplification and gain controlling, deliver to the reception Base-Band Processing passage of each road signal;
The processing bandwidth of described transmission Base-Band Processing passage is 20MHz-60MHz, and the baseband modulation mode is discrete OFDM; Each sends the Base-Band Processing passage by digital signal processor, central processing unit, and field programmable gate array, digital up converter and digital to analog converter are formed; In passage, connect digital up converter, digital signal processor and central processing unit by field programmable gate array; Finish the discrete OFDM modulation of base band by digital signal processor, generate the two-way i/q signal; Handle data flow tissue, management and the related protocol control that sends between Base-Band Processing passage and the link protocol processing module by central processing unit; By digital up converter discrete orthogonal frequency-division multiplex base band modulation signal is upconverted to first intermediate frequency, output to digital to analog converter then and obtain simulating the Low Medium Frequency signal through digital-to-analogue conversion, signal frequency range is that 10MHz is to 70MHz;
Described reception Base-Band Processing passage comprises analog to digital converter, digital down converter, digital signal processor, central processing unit and field programmable gate array; Field programmable gate array connects digital down converter, digital signal processor and central processing unit; By analog to digital converter each road Low Medium Frequency signal of radio frequency front-end processing module output is sampled and digitlization; Obtain I/Q two-way quadrature baseband digital signal through behind the digital down converter; Digital signal processor is finished the discrete OFDM demodulation of base band according to two-way I/Q baseband digital signal; Finish data flow tissue, management and the related protocol control that receives between Base-Band Processing passage and the link protocol processing module by central processing unit;
Described link protocol processing module can be by the modulation parameter of discrete OFDM modulation in the software dynamic-configuration Base-Band Processing passage: comprise the number of sub carrier wave that uses and frequency, the modulation system on each subcarrier etc.; Finish the organization and management of data flow, the data to be transmitted of outside input is assigned to a plurality of transmission Base-Band Processing passages according to the link transmission agreement transmits, and be spliced into the data flow form again according to the data that the link transmission agreement will receive the output of Base-Band Processing passage and export.
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