CN104009765A - A High Performance LTE Channel Simulator RF Transmitter - Google Patents

Abstract

The invention discloses a high-performance LTE channel simulator radio frequency transmitter, which comprises an intermediate frequency modulation module, an intermediate frequency automatic level adjustment (ALC) module, a segmented frequency conversion filtering module, a radio frequency power adjustment output/detection module and a local oscillator module. The invention provides a high-performance LTE channel simulator radio frequency transmitter, which can effectively reduce the complexity of the LTE channel simulator, reduce power consumption and volume, and realize the high dynamics, wide frequency band and low complexity of the transmitter.

Description

A High Performance LTE Channel Simulator RF Transmitter

technical field

The invention relates to a high-performance LTE channel simulator radio frequency transmitter, which belongs to microwave/millimeter wave device technology.

Background technique

"New Generation Broadband Wireless Mobile Communication Network" National Science and Technology Major Project is a major national science and technology project in order to promote the overall development of my country's communication industry, enhance the global status of my country's wireless mobile communication industry, cultivate the sustainable development ability of my country's mobile communication industry, and stimulate the innovation of my country's national industry important measure of development. TD-LTE and its evolution technology TD-LTE-Advanced, as a subsequent evolution technology of TD-SCDMA with my country's independent intellectual property rights, will further reflect my country's voice and competitiveness in the international communication field.

The wireless channel is a very complex and changeable signal physical channel. The wireless channel has unfavorable factors such as multipath fading, flat fading, and noise that affect the communication performance. These are issues that must be considered in the research of the communication system. The simulation of the channel It is an essential test process to ensure smooth communication between terminals developed by different manufacturers and system equipment provided by multiple manufacturers under the same communication protocol and system system. By developing and supporting LTE wireless channel simulators, the development cost of mobile communication equipment is saved, the flexibility of research and development is increased, and the development cycle is shortened, the overall development process of base stations and terminal equipment and the time for interconnection and intercommunication testing are reduced, and the time for field testing is reduced. , which plays a very positive role in improving and ensuring the interconnection of different systems and terminal manufacturers.

The broadband radio frequency transmitter in the LTE channel simulator is a key part of the whole device. The radio frequency transmitter can transmit the analog I and Q signals required by the baseband according to the requirements. The frequency range of the transmission is 400MHz~6GHz. The transmitter transmits The power range is -120～-10dBm, and the processing bandwidth of the transmitter can reach 100MHz. The phase of the transmitter channel is adjusted by adjusting the phase of the local oscillator in the modulator. At the same time, it needs to have low complexity, low power consumption, and large dynamic features.

Contents of the invention

Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides a high-performance LTE channel simulator radio frequency transmitter, which can effectively reduce the complexity of the LTE channel simulator, reduce power consumption and volume, and realize the large size of the transmitter Dynamic, wideband, low complexity.

Technical scheme: in order to achieve the above object, the technical scheme adopted in the present invention is:

Broadband radio frequency transmitter is the core component of radio frequency and microwave systems, and plays a key role in communication, radar and electronic countermeasures. Its main technical indicators are transmission bandwidth, dynamic range of transmission level, processing bandwidth, etc. The high-performance LTE channel emulator radio frequency transmitter designed by the invention has the characteristics of wide output frequency band, large dynamic power, wide processing bandwidth, small volume, low power consumption and the like. It specifically includes an intermediate frequency modulation module, an intermediate frequency automatic level adjustment (ALC) module, a segmental frequency conversion filter module, a radio frequency power adjustment output/detection module and a local oscillator module;

The intermediate frequency modulation module: Carry out orthogonal vector modulation on the input analog signal I and analog signal Q to generate an intermediate frequency modulation signal, and then send the obtained intermediate frequency modulation signal to the intermediate frequency automatic level adjustment module; insert a The phase-adjustable IF frequency synthesizer makes the phase of the input local oscillator signal adjustable, and realizes the function of adjusting the phase of radio frequency transmission;

The intermediate frequency automatic level adjustment module: adjust the level amplitude of the input signal, and send it to the segmental frequency conversion filter module after adjustment within the threshold range;

The segmented frequency conversion filter module: process the input signal in frequency bands, and for different frequency bands, perform respective frequency conversion filter unit processing, change to the corresponding frequency range and send to the radio frequency power adjustment output/detection module;

The radio frequency power adjustment output/detection module: detect the power of the input signal, if the power of the input signal is greater than the threshold, the input signal is attenuated and then output as a broadband radio frequency output signal; if the input signal is less than or equal to the threshold, it is directly used as Broadband RF output signal output;

The local oscillator module: provides radio frequency local oscillator signals to the LTE channel simulator.

In order to achieve precise control of the phase in the radio frequency circuit, a phase shifter is usually inserted in the transceiver to achieve phase adjustment. Different phase shifter schemes have different phase shifting effects. The operating bandwidth of the analog phase shifter is relatively narrow; the operating frequency bandwidth of the digital control phase shifter can be slightly wider, but the phase shifting accuracy is not high enough, and the typical phase shifting accuracy is generally 6.25 degrees. The scheme adopted by the present invention is to insert a frequency synthesizer with adjustable intermediate frequency phase in the demodulation link. The phase adjustment precision of this frequency synthesizer can reach 2 degrees, the precision is high, and the implementation method is simple, and no need for the receiver and A complex phase-shifting circuit is inserted into the transmitter to further reduce the complexity of the frequency synthesizer in the LTE channel simulator.

Due to the wide frequency range of the radio frequency transmitter, the traditional transmitter scheme cannot take into account such a wide frequency range; the present invention realizes the wide frequency band by adopting a segmented processing method. The dynamic range requirement of the power output by the transmitter is also very large, and it is also very difficult to realize a large dynamic range in such a wide frequency band. The present invention proposes that the dynamic range of the power be realized on the intermediate frequency, and only a relevant numerically controlled attenuator needs to be added on the radio frequency. Calibrate the frequency response characteristics.

Specifically, the intermediate frequency modulation module performs quadrature vector modulation on the input analog signal I and analog signal Q to generate an intermediate frequency modulation signal with a frequency of 1.2 GHz, and then sends the obtained intermediate frequency modulation signal to the intermediate frequency automatic level adjustment module.

Specifically, the intermediate frequency modulation module includes an intermediate frequency modulator.

Specifically, the intermediate frequency automatic level adjustment module includes A intermediate frequency amplifier, A intermediate frequency filter, B intermediate frequency amplifier, A intermediate frequency numerical control attenuator, B intermediate frequency numerical control attenuator, C intermediate frequency amplifier, C intermediate frequency numerical control attenuator and B intermediate frequency filter, the input end of A intermediate frequency amplifier is connected to the output end of the intermediate frequency modulation module, the output end of B intermediate frequency filter is connected to the input end of the directional coupler, and the coupling end of the directional coupler is connected to the D intermediate frequency amplifier and the intermediate frequency detector in turn, The output terminal of the directional coupler is connected to the input terminal of the section frequency conversion filter module.

Specifically, the segmented frequency conversion filter module performs frequency-band processing on the input 400MHz～6GHz radio frequency signal, and after performing the respective frequency conversion filter unit processing for different frequency bands, the 1.2GHz intermediate frequency signal is changed to the corresponding frequency range and send it to the RF power adjustment output/detection module;

Specifically, the segmented frequency conversion filter module includes A radio frequency single pole double throw switch, A radio frequency amplifier, A radio frequency mixer, B radio frequency amplifier, radio frequency divider, B radio frequency mixer, C radio frequency amplifier, D radio frequency amplifier , B radio frequency SPDT switch, A radio frequency SPDT switch, D radio frequency tunable filter, C radio frequency tunable filter, B radio frequency tunable filter, A radio frequency tunable filter and B radio frequency single pole four throw switch, The input terminal of the radio frequency single-pole double-throw switch is connected to the output terminal of the intermediate frequency automatic level adjustment module, and the output terminal of the B radio frequency single-pole four-throw switch is connected to the input terminal of the radio frequency power adjustment output/detection module;

One output of the A radio frequency single-pole double throw switch is connected to the A radio frequency amplifier, the A radio frequency mixer and the C radio frequency amplifier in turn, and then connected to one input of the B radio frequency single pole double throw switch; the other of the A radio frequency single pole double throw switch One output is connected to B RF amplifier, B RF mixer and D RF amplifier in turn, and then connected to the other input of B RF single-pole double-throw switch; between A RF mixer and B RF mixer through RF frequency divider connect;

The output of the B radio frequency single pole double throw switch is connected to the input of the A radio frequency single pole four throw switch, and the four outputs of the A radio frequency single pole four throw switch are respectively connected to the D radio frequency adjustable filter, the C radio frequency adjustable filter, and the B radio frequency adjustable filter. The input of tunable filter and A radio frequency tunable filter, the outputs of D radio frequency tunable filter, C radio frequency tunable filter, B radio frequency tunable filter and A radio frequency tunable filter are respectively connected to B radio frequency single-pole four-throw switch four inputs;

The D radio frequency tunable filter processes 400MHz-1GHz signals, the C radio frequency tunable filter processes 1GHz-2GHz signals, the B radio frequency tunable filter processes 2GHz-4GHz signals, and the A radio frequency tunable filter processes 4GHz-6GHz signals.

Specifically, the radio frequency power adjustment output/detection module includes a radio frequency broadband amplifier, a radio frequency numerical control attenuator, a broadband directional coupler, an E radio frequency amplifier and a radio frequency detector, and the output terminal of the segmental frequency conversion filtering module is connected to the input terminal of the radio frequency broadband amplifier Connect, the output terminal of the RF broadband amplifier is connected to the input terminal of the RF digitally controlled attenuator, the output terminal of the RF digitally controlled attenuator is connected to the input terminal of the broadband directional coupler, and the coupling terminal of the broadband directional coupler is connected to the E RF amplifier and the RF detector in turn, The output end of the broadband directional coupler outputs a broadband radio frequency output signal.

Specifically, the local oscillator module includes an intermediate frequency synthesizer and a radio frequency synthesizer, the intermediate frequency synthesizer provides an intermediate frequency local oscillator signal to the intermediate frequency modulator, and the radio frequency synthesizer provides an A radio frequency local oscillator signal to the A radio frequency mixer, The RF frequency synthesizer provides the B RF local oscillator signal to the B RF mixer through the RF frequency divider.

Specifically, it also includes a single-chip microcomputer control module and a power supply module, and the single-chip microcomputer module is used for B radio frequency single-pole four-throw switch, A radio frequency adjustable filter, B radio frequency adjustable filter, C radio frequency adjustable filter, D radio frequency adjustable filter Device, A RF SPDT switch, B RF SPDT switch, RF frequency divider, A RF SPDT switch, RF frequency synthesizer, C IF CNC attenuator, B IF CNC attenuator and A IF CNC attenuator chip for control.

Beneficial effects: a high-performance LTE channel emulator radio frequency transmitter provided by the present invention can effectively reduce the complexity of the LTE channel emulator, reduce power consumption and volume, and realize high dynamics, wide frequency band, and low complexity of the transmitter; It has the characteristics of wide frequency bandwidth, large dynamics, low power consumption, small size, and high modulation accuracy, and is suitable for LTE channel simulators and corresponding wideband RF transmitters.

Description of drawings

Fig. 1 is the block diagram that is applied to the broadband radio frequency transmitter in the LTE channel emulator provided by the present invention;

FIG. 2 is a block diagram of a specific implementation scheme of a broadband radio frequency transmitter applied in an LTE channel simulator.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings.

As shown in Figure 1 and Figure 2, it is a high-performance LTE channel simulator RF transmitter, including an intermediate frequency modulation module, an intermediate frequency automatic level adjustment module, a segmental frequency conversion filter module, an RF power adjustment output/detection module, and a local oscillator module , Single-chip microcomputer control module and power supply module; each module will be described in detail below.

The intermediate frequency modulation module: Carry out orthogonal vector modulation on the input analog signal I and analog signal Q to generate an intermediate frequency modulation signal with a frequency of 1.2 GHz, and then send the obtained intermediate frequency modulation signal to the intermediate frequency automatic level adjustment module; A phase-adjustable IF frequency synthesizer is inserted into the modulation module, so that the phase of the input local oscillator signal can be adjusted to realize the function of adjusting the phase of radio frequency transmission.

The IF modulation module includes an IF modulator 32 .

The intermediate frequency automatic level adjustment module: adjust the level amplitude of the input signal to the threshold range of -10 ~ -120dBm, and send it to the segmental frequency conversion filter module after being adjusted within the threshold range.

The intermediate frequency automatic level adjustment module includes A intermediate frequency amplifier 31, A intermediate frequency filter 30, B intermediate frequency amplifier 29, A intermediate frequency numerical control attenuator 28, B intermediate frequency numerical control attenuator 27, C intermediate frequency amplifier 26, C intermediate frequency numerical control The attenuator 25 and the B intermediate frequency filter 22, the input terminal of the A intermediate frequency amplifier 31 is connected to the output terminal of the intermediate frequency modulation module, the output terminal of the B intermediate frequency filter 22 is connected to the input terminal of the directional coupler 21, and the coupling terminals of the directional coupler 21 are sequentially It is connected to D intermediate frequency amplifier 23 and intermediate frequency detector 24, and the output terminal of directional coupler 21 is connected to the input terminal of segmental frequency conversion filter module.

The segmented frequency conversion filtering module: the input signal is divided into frequency bands, and for different frequency bands, after the respective frequency conversion filtering units are processed, the frequency range is changed to the corresponding frequency range and sent to the radio frequency power adjustment output/detection module; The segmented frequency conversion filter module processes the input 400MHz~6GHz RF signal in divided frequency bands. For different frequency bands, after processing with their respective frequency conversion filter units, the 1.2GHz intermediate frequency signal is changed to the corresponding frequency range and sent to the RF Power adjustment output/detection module.

Described section frequency conversion filter module comprises A radio frequency SPDT switch 18, A radio frequency amplifier 17, A radio frequency mixer 16, B radio frequency amplifier 15, radio frequency divider 14, B radio frequency mixer 13, C radio frequency amplifier 12 , D radio frequency amplifier 11, B radio frequency single pole double throw switch 10, A radio frequency single pole four throw switch 9, D radio frequency adjustable filter 8, C radio frequency adjustable filter 7, B radio frequency adjustable filter 6, A radio frequency adjustable Filter 5 and B radio frequency single pole four throw switch 4, the input terminal of A radio frequency single pole double throw switch 18 is connected to the output terminal of the intermediate frequency automatic level adjustment module, the output terminal of B radio frequency single pole four throw switch 4 is connected to the radio frequency power adjustment output/detection input of the module.

One output of the A radio frequency single-pole double-throw switch 18 is connected to the A radio frequency amplifier 17, the A radio frequency mixer 16 and the C radio frequency amplifier 12 in turn, and then one input of the B radio frequency single pole double throw switch 10 is connected; the A radio frequency single pole The other output of the double-throw switch 18 is connected to the B radio frequency amplifier 15, the B radio frequency mixer 13 and the D radio frequency amplifier 11 in turn, and then connected to the other input of the B radio frequency SPDT switch 10; the A radio frequency mixer 16 and the B radio frequency mixer 16 The radio frequency mixers 13 are connected through a radio frequency divider 14 .

The output of the B radio frequency single pole double throw switch 10 is connected to the input of the A radio frequency single pole four throw switch 9, and the four outputs of the A radio frequency single pole four throw switch 9 are respectively connected to the D radio frequency adjustable filter 8 and the C radio frequency adjustable filter 7. Input of B RF tunable filter 6 and A RF tunable filter 5, D RF tunable filter 8, C RF tunable filter 7, B RF tunable filter 6 and A RF tunable filter The outputs of 5 are respectively connected to the four inputs of the B radio frequency single-pole four-throw switch 4.

The 400-1GHz radio frequency output signal is a 400MHz-1GHz radio frequency modulation signal generated by an intermediate frequency 1.2GHz modulation signal through A radio frequency single-pole double-throw switch 18, B radio frequency amplifier 15, and B radio frequency mixer 13, and then passes through D radio frequency amplifier 11 , B radio frequency single pole double throw switch 10, A radio frequency single pole four throw switch 9, D radio frequency adjustable filter 8 and B radio frequency single pole four throw switch 4, and finally reach the radio frequency power adjustment/detection module.

The 1-2GHz radio frequency output signal is a 1-2GHz radio frequency modulation signal generated by an intermediate frequency 1.2GHz modulation signal through A radio frequency single-pole double-throw switch 18, B radio frequency amplifier 15, and B radio frequency mixer 13, and then passes through C radio frequency amplifier 12 , B radio frequency single pole double throw switch 10, A radio frequency single pole four throw switch 9, C radio frequency adjustable filter 7 and B radio frequency single pole four throw switch 4, and finally reach the radio frequency power adjustment/detection module.

The 2-4GHz radio frequency output signal is a 2-4GHz radio frequency modulation signal generated by an intermediate frequency 1.2GHz modulation signal through the A radio frequency single-pole double-throw switch 18, the A radio frequency amplifier 17, and the A radio frequency mixer 16, and then passes through the C radio frequency amplifier 12 , B radio frequency single pole double throw switch 10, A radio frequency single pole four throw switch 9, B radio frequency adjustable filter 6 and B radio frequency single pole four throw switch 4, and finally reach the radio frequency power adjustment/detection module.

The 4-6GHz radio frequency output signal is a 4-6GHz radio frequency modulation signal generated by the intermediate frequency 1.2GHz modulation signal through the A radio frequency single-pole double-throw switch 18, the A radio frequency amplifier 17, and the A radio frequency mixer 16, and then passes through the C radio frequency amplifier 12 , B radio frequency single pole double throw switch 10, A radio frequency single pole four throw switch 9, A radio frequency adjustable filter 5 and B radio frequency single pole four throw switch 4, and finally reach the radio frequency power adjustment/detection module.

The radio frequency power adjustment output/detection module: detect the power of the input signal, if the power of the input signal is greater than the threshold, the input signal is attenuated and then output as a broadband radio frequency output signal; if the input signal is less than or equal to the threshold, it is directly used as Broadband RF output signal output.

The radio frequency power adjustment output/detection module includes a radio frequency broadband amplifier 3, a radio frequency numerically controlled attenuator 2, a broadband directional coupler 1, an E radio frequency amplifier 34 and a radio frequency detector 35, and the output terminal of the segmental frequency conversion filter module is connected to the radio frequency broadband amplifier 3 The input end of the radio frequency broadband amplifier 3 is connected to the input end of the radio frequency numerical control attenuator 2, the output end of the radio frequency numerical control attenuator 2 is connected to the input end of the broadband directional coupler 1, and the coupling end of the broadband directional coupler 1 is sequentially connected to E RF amplifier 34 and RF detector 35, the output end of broadband directional coupler 1 outputs a broadband RF output signal.

The local oscillator module: provides radio frequency local oscillator signals to the LTE channel simulator.

Described local oscillator module comprises intermediate frequency frequency synthesizer 20 and radio frequency frequency synthesizer 19, and intermediate frequency frequency synthesizer 20 provides intermediate frequency local oscillator signal to intermediate frequency modulator 32, and radio frequency frequency synthesizer 19 provides A radio frequency this to A radio frequency mixer 16 The RF frequency synthesizer 19 provides the B RF local oscillator signal to the B RF mixer 13 through the RF frequency divider 14.

The single-chip microcomputer module is to the B radio frequency single-pole four-throw switch 4, the A radio frequency adjustable filter 5, the B radio frequency adjustable filter 6, the C radio frequency adjustable filter 7, the D radio frequency adjustable filter 8, and the A radio frequency single pole four throw Switch 9, B RF SPDT switch 10, RF frequency divider 14, A RF SPDT switch 18, RF frequency synthesizer 19, C IF digitally controlled attenuator 25, B IF digitally controlled attenuator 27 and A IF digitally controlled attenuator 28 chips for control.

The power supply module supplies power to the entire circuit.

The dynamic range of the transmitter is large. In this case, a large dynamic automatic level control circuit is made in the intermediate frequency to realize the large dynamic of the circuit. An automatic level control circuit is also inserted in the radio frequency part to control the response of the device at different frequencies. Amplitude imbalance is calibrated to achieve large dynamics of the entire transmitter.

The above is only a preferred embodiment of the present invention, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications are also possible. It should be regarded as the protection scope of the present invention.

Claims (9)

1. A high-performance LTE channel emulator radio frequency transmitter is characterized in that: comprise intermediate frequency modulation module, intermediate frequency automatic level adjustment module, subsection frequency conversion filtering module, radio frequency power adjustment output/detection module and local oscillator module; The intermediate frequency modulation module: Carry out orthogonal vector modulation on the input analog signal I and analog signal Q to generate an intermediate frequency modulation signal, and then send the obtained intermediate frequency modulation signal to the intermediate frequency automatic level adjustment module; insert a The phase-adjustable IF frequency synthesizer makes the phase of the input local oscillator signal adjustable, and realizes the function of adjusting the phase of the radio frequency transmission; The intermediate frequency automatic level adjustment module: adjust the level amplitude of the input signal, and send it to the segmental frequency conversion filter module after adjustment within the threshold range; The segmented frequency conversion filtering module: the input signal is divided into frequency bands, and for different frequency bands, after the respective frequency conversion filtering units are processed, they are changed to the corresponding frequency range and sent to the radio frequency power adjustment output/detection module; The radio frequency power adjustment output/detection module: detect the power of the input signal, if the power of the input signal is greater than the threshold, the input signal is attenuated and then output as a broadband radio frequency output signal; if the input signal is less than or equal to the threshold, it is directly used as Broadband RF output signal output; The local oscillator module: provides radio frequency local oscillator signals to the LTE channel simulator. the 2. the high-performance LTE channel emulator radio frequency transmitter according to claim 1, is characterized in that: described intermediate frequency modulation module carries out orthogonal vector modulation to the analog signal I of input and analog signal Q, produces frequency and is 1.2GHz the intermediate frequency modulation signal, and then send the obtained intermediate frequency modulation signal to the intermediate frequency automatic level adjustment module. the 3. The high-performance LTE channel emulator radio frequency transmitter according to claim 2, characterized in that: the intermediate frequency modulation module comprises an intermediate frequency modulator (32). the 4. high performance LTE channel emulator radio frequency transmitter according to claim 3, is characterized in that: described intermediate frequency automatic level adjustment module comprises A intermediate frequency amplifier (31), A intermediate frequency filter (30), A intermediate frequency filter (30) connected successively, B intermediate frequency amplifier (29), A intermediate frequency digital control attenuator (28), B intermediate frequency digital control attenuator (27), C intermediate frequency amplifier (26), C intermediate frequency digital control attenuator (25) and B intermediate frequency filter (22), A The input end of the intermediate frequency amplifier (31) is connected to the output end of the intermediate frequency modulation module, the output end of the B intermediate frequency filter (22) is connected to the input end of the directional coupler (21), and the coupling end of the directional coupler (21) is connected to the D intermediate frequency in turn. The amplifier (23), the intermediate frequency detector (24), and the output terminal of the directional coupler (21) are connected to the input terminal of the subsection frequency conversion filtering module. the 5. high-performance LTE channel emulator radio frequency transmitter according to claim 4, is characterized in that: described subsection frequency conversion filtering module carries out sub-band processing to the radio frequency signal of input 400MHz～6GHz, for different frequency bands, After processing by their respective frequency conversion filter units, the 1.2GHz intermediate frequency signal is changed to the corresponding frequency range and sent to the RF power adjustment output/detection module. the 6. high-performance LTE channel emulator radio frequency transmitter according to claim 5, is characterized in that: described section frequency conversion filtering module comprises A radio frequency single pole double throw switch (18), A radio frequency amplifier (17), A radio frequency Mixer (16), Radio Frequency Amplifier B (15), Radio Frequency Divider (14), Radio Frequency Mixer B (13), Radio Frequency Amplifier C (12), Radio Frequency Amplifier D (11), Radio Frequency Single Pole Double Throw Switch (10), A radio frequency single pole four throw switch (9), D radio frequency adjustable filter (8), C radio frequency adjustable filter (7), B radio frequency adjustable filter (6), A radio frequency adjustable filter device (5) and B radio frequency SPDT switch (4), the input terminal of A radio frequency SPDT switch (18) is connected to the output terminal of the intermediate frequency automatic level adjustment module, and the output terminal of B radio frequency SPDT switch (4) Connect to the input terminal of the RF power adjustment output/detection module; One output of the A radio frequency single pole double throw switch (18) is connected to the A radio frequency amplifier (17), the A radio frequency mixer (16) and the C radio frequency amplifier (12) successively, and then accesses the B radio frequency single pole double throw switch (10 ) input; the other output of the A radio frequency SPDT switch (18) is connected to the B radio frequency amplifier (15), the B radio frequency mixer (13) and the D radio frequency amplifier (11) in turn, and then accesses the B radio frequency Another input of the single-pole double-throw switch (10); A radio frequency mixer (16) and B radio frequency mixer (13) are connected through a radio frequency divider (14); The output of the B radio frequency single-pole double-throw switch (10) is connected with the input of the A radio frequency single-pole four-throw switch (9), and the four-way output of the A radio frequency single-pole four-throw switch (9) is connected to the D radio frequency adjustable filter (8) respectively. ), C radio frequency tunable filter (7), B radio frequency tunable filter (6) and A radio frequency tunable filter (5) input, D radio frequency tunable filter (8), C radio frequency tunable filter (7), the output of the B radio frequency adjustable filter (6) and the A radio frequency adjustable filter (5) are respectively connected to the four-way input of the B radio frequency single-pole four-throw switch (4); The D radio frequency tunable filter (8) processes 400MHz～1GHz signals, the C radio frequency tunable filter (7) processes 1GHz～2GHz signals, the B radio frequency tunable filter (6) processes 2GHz～4GHz signals, and the A radio frequency can The tuning filter (5) processes 4GHz-6GHz signals. the 7. high-performance LTE channel emulator radio frequency transmitter according to claim 6, is characterized in that: described radio frequency power adjustment output/detection module comprises radio frequency broadband amplifier (3), radio frequency numerical control attenuator (2), broadband directional Coupler (1), E radio frequency amplifier (34) and radio frequency detector (35), the output terminal of segmental frequency conversion filtering module is connected with the input terminal of radio frequency broadband amplifier (3), and the output terminal of radio frequency broadband amplifier (3) is connected The input terminal of the radio frequency numerically controlled attenuator (2), the output terminal of the radio frequency numerically controlled attenuator (2) is connected to the input terminal of the broadband directional coupler (1), and the coupling terminal of the broadband directional coupler (1) is connected to the E radio frequency amplifier (34 ) and a radio frequency detector (35), the output end of the broadband directional coupler (1) outputs a broadband radio frequency output signal. the 8. high-performance LTE channel emulator radio frequency transmitter according to claim 1, is characterized in that: described local oscillator module comprises intermediate frequency frequency synthesizer (20) and radio frequency frequency synthesizer (19), intermediate frequency frequency synthesizer ( 20) Provide the intermediate frequency local oscillator signal to the intermediate frequency modulator (32), the radio frequency frequency synthesizer (19) provides the A radio frequency local oscillator signal to the A radio frequency mixer (16), and the radio frequency frequency synthesizer (19) passes through the radio frequency divider (14) Provide the B radio frequency local oscillator signal to the B radio frequency mixer (13). the 9. high-performance LTE channel emulator radio frequency transmitter according to claim 1, is characterized in that: also comprise single-chip microcomputer control module and power supply module, described single-chip microcomputer module is to B radio frequency single-pole four-throw switch (4), A radio frequency can Tunable filter (5), B radio frequency tunable filter (6), C radio frequency tunable filter (7), D radio frequency tunable filter (8), A radio frequency single pole four throw switch (9), B radio frequency single pole Double throw switch (10), RF frequency divider (14), A RF SPDT switch (18), RF frequency synthesizer (19), C IF digitally controlled attenuator (25), B IF digitally controlled attenuator (27) And the chip of A intermediate frequency digital control attenuator (28) is controlled. the