CN219164568U

CN219164568U - Receiving and transmitting device for ultrashort wave radio frequency communication

Info

Publication number: CN219164568U
Application number: CN202223469319.8U
Authority: CN
Inventors: 于猛; 巩执欢; 杨博; 吴迪; 肖珊珊
Original assignee: Tianjin Optical Electrical Communication Technology Co Ltd
Current assignee: Tianjin Optical Electrical Communication Technology Co Ltd
Priority date: 2022-12-23
Filing date: 2022-12-23
Publication date: 2023-06-09
Anticipated expiration: 2032-12-23

Abstract

The utility model provides a transceiver for ultrashort wave radio frequency communication, which comprises a receiving module, a demodulating module and a modulating local oscillator module which are connected with each other; the receiving module is used for receiving signals and performing down-conversion on the received signals to intermediate frequency signals; the demodulation module is used for demodulating the intermediate frequency signal into a baseband signal, and collecting and outputting the baseband signal through AD; the modulation local oscillation module receives the baseband signal, generates a transmitting signal based on the baseband signal, simultaneously generates a receiving local oscillation signal, and feeds back the receiving local oscillation signal to the receiving module. The receiving and transmitting device can complete the signal receiving function from the baseband to the front end of the power amplifier and from the antenna to the baseband.

Description

Receiving and transmitting device for ultrashort wave radio frequency communication

Technical Field

The utility model relates to the technical field of communication, in particular to a transceiver for ultrashort wave radio frequency communication.

Background

The ultrashort wave wireless data transmission device is widely applied to handheld interphones, radio stations, unmanned aerial vehicle image transmission, internet of things equipment and the like. The traditional ultrashort wave wireless data transmission device is based on discrete analog device design, the integration level of internal devices is not high, the equipment is large in size and high in power consumption, most of the devices are poor in universality, only a single modulation and demodulation mode is supported, and function expansion is difficult to achieve. Therefore, a software radio design thought is proposed, and the core thought is as follows: hardware radio communication equipment is used as a basic platform for communication, a radio communication technology is controlled by using modern software, a plurality of communication functions are realized by the software, and the bottleneck that the communication technology depends on hardware development in the past is broken.

The existing transceiver applied to ultrashort wave wireless communication is mostly inconvenient to further expand application occasions, and frequency hopping application is difficult to cover.

Therefore, it is necessary to provide a new transceiver device that can further expand the application and cover the frequency hopping application.

Disclosure of Invention

Technical problem to be solved

In view of the above-mentioned drawbacks of the prior art, the present utility model provides a transceiver for ultrashort wave radio frequency communication, which can complete the functions of transmitting signals from baseband to front end of power amplifier and receiving signals from antenna to baseband.

Technical proposal

In order to achieve the above purpose, the utility model is realized by the following technical scheme:

the utility model relates to a transceiver for ultrashort wave radio frequency communication, which comprises a receiving module, a demodulating module and a modulating local oscillator module which are connected with each other; the receiving module is used for receiving signals and performing down-conversion on the received signals to intermediate frequency signals; the demodulation module is used for demodulating the intermediate frequency signal into a baseband signal, and collecting and outputting the baseband signal through AD; the modulation local oscillation module receives the baseband signal, generates a transmitting signal based on the baseband signal, simultaneously generates a receiving local oscillation signal, and feeds back the receiving local oscillation signal to the receiving module.

Further, the transceiver is used for a radio frequency hardware link in a wireless communication system.

Further, the receiving module adopts a superheterodyne architecture, and the modulating local oscillation module directly transmits the transmitting signal through the DDS.

Further, the receiving module comprises a low noise amplifier, a digital attenuator and an electrically tunable filter.

Further, the model of the low noise amplifier is SGA-4586, the model of the digital attenuator is HMC542, and the electric tuning filter adopts a 7-order electric tuning filter and is switched by external control frequency.

Further, the demodulation module comprises a mixer, a SAW (surface Acoustic wave) demodulation chip, and finally generates two paths of differential signals and sends the two paths of differential signals to the modulation local oscillation module.

Further, the model of the mixer is ADE-1+, the model of the SAW is TB0217A, and the model of the demodulation chip is AD6121.

Further, the modulation local oscillation module comprises a DDS unit, an FPGA and an AD.

Further, the model adopted by the DDS unit is AD9910, the corresponding baseband signal and the corresponding receiving local oscillator signal are generated through the FPGA, the model adopted by the AD is AD9238, and the model adopted by the FPGA is XC3S400-4PQ208I.

Advantageous effects

The utility model designs a transceiver for ultrashort wave radio frequency communication, which can complete the functions of transmitting signals from a baseband to the front end of a power amplifier and receiving signals from an antenna to the baseband; further, the receiving and transmitting frequency of the receiving and transmitting device can be adjusted; still further, the transceiver has a high transmitting and receiving dynamic range; finally, the receiving and transmitting device adopts a modularized design, so that the volume is reduced.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It is evident that the drawings in the following description are only some embodiments of the present utility model and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.

Fig. 1 is a schematic structural diagram of a transceiver device for ultrashort wave radio frequency communication according to an embodiment of the present utility model;

fig. 2 is a schematic diagram of a transceiver device for ultrashort wave radio frequency communication according to an embodiment of the present utility model;

fig. 3 is a schematic diagram of a receiving module in a transceiver for ultrashort wave radio frequency communication according to an embodiment of the present utility model;

fig. 4 is a schematic diagram of a demodulation module in a transceiver for ultrashort wave radio frequency communication according to an embodiment of the present utility model;

fig. 5 is a schematic diagram of a modulating local oscillation module in a transceiver for ultrashort wave radio frequency communication according to an embodiment of the present utility model.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present utility model more clear, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. It will be apparent that the described embodiments are some, but not all, embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1 and fig. 2, an embodiment of the present utility model provides a transceiver for ultrashort wave radio frequency communication, which includes a receiving module, a demodulating module and a modulating local oscillator module connected to each other; the receiving module is used for receiving signals and performing down-conversion on the received signals to intermediate frequency signals; the demodulation module is used for demodulating the intermediate frequency signal into a baseband signal, and collecting and outputting the baseband signal through AD; the modulation local oscillation module receives the baseband signal, generates a transmitting signal based on the baseband signal, simultaneously generates a receiving local oscillation signal, and feeds back the receiving local oscillation signal to the receiving module.

In the implementation, referring to fig. 2, the system is composed of three modules, namely a modulating local oscillator module, a demodulating module and a receiving module. The receiving module amplifies and filters the received signal and transmits the amplified signal to the demodulation module, and the implementation mode is that the received radio frequency signal is amplified by a low noise amplifier and then filtered by an electrically tunable filter, and the amplified signal is electrically tuned to the demodulation module. The demodulation module mainly has the functions of converting a received signal into a high intermediate frequency, amplifying and filtering the high intermediate frequency, then demodulating the high intermediate frequency, sending the demodulated signal to the modulation local oscillation module, and detecting the received signal to finish receiving AGC. The main functions of the modulation local oscillation module are to generate a receiving local oscillation signal, control a receiving AGC, generate a transmitting signal and receive a demodulation signal, and simultaneously control the whole machine.

In this embodiment, the transceiver device is used for a radio frequency hardware link in a wireless communication system. And the receiving module adopts a superheterodyne architecture, and the modulating local oscillation module directly transmits the transmitting signal through the DDS, so that the receiving and transmitting device provided by the embodiment can consider the application environment of frequency hopping by adopting the design. Further, DDS (D i rect D i gita l Synthes i s) refers to a digital synthesis technique that converts a series of digital signals into analog signals through a D/a converter.

In this embodiment, referring to fig. 2 and 3, the receiving module filters the received radio frequency signal after low noise amplification, and finally amplifies the radio frequency signal and electrically modulates the radio frequency signal to the demodulating module. Thus, the receiving module generally includes a low noise amplifier, a digital attenuator, and an electrically tunable filter. The model of the low noise amplifier selects SGA-4586, the model of the digital attenuator adopts HMC542 to ensure the dynamic range of a link, and the electric tuning filter uses a 7-order electric tuning filter and is switched by external control frequency. In addition, the electrically tunable filter performs passband control by changing the capacitance value through a DA-controlled varactor.

In this embodiment, referring to fig. 2 and fig. 4, the function of the demodulation module is mainly to convert the received signal to a high intermediate frequency 140MHz, amplify and filter the received signal, demodulate the received signal, and send the demodulated signal to the modulation local oscillation module, and detect the received signal to complete the receiving AGC. Therefore, the demodulation module generally comprises a mixer, a SAW and a demodulation chip, and finally generates two paths of differential signals to be sent to the modulation local oscillation module, wherein the mixer adopts ADE-1+, the SAW uses TB0217A, I L is 5dB or 3dB, the bandwidth is 100kHz when 3dB is adopted, the bandwidth is 400kHz when 5dB is adopted, the demodulation chip adopts AD6121, the reference frequency is generated by ADF4360 to 280MHz, and finally generates two paths of differential signals to be sent to the modulation local oscillation module.

In this embodiment, referring to fig. 2 and 5, the main function of the modulating local oscillator module is to generate a receiving local oscillator signal, control the receiving AGC, generate a transmitting signal, receive a demodulating signal, and control the whole machine. Therefore, the modulation local oscillation module generally comprises a DDS unit, an FPGA and an AD, wherein FPGA (F i e l d Programmab l e Gate Array) is a chip further developed on the basis of programmable devices such as PAL (programmable array logic), GAL (general array logic) and the like. In this embodiment, as shown in fig. 5, the DDS unit adopts an AD9910, and generates a corresponding required baseband signal and receives a local oscillator signal through FPGA control, where the AD uses an AD9238 to have a 4-path AD, and the FPGA uses XC3S400-4pq208I.

The utility model has the advantages that the transceiver for ultrashort wave radio frequency communication is designed, and the transceiver can complete the functions of transmitting signals from the baseband to the front end of the power amplifier and receiving signals from the antenna to the baseband; further, the receiving and transmitting frequency of the receiving and transmitting device can be adjusted; still further, the transceiver has a high transmitting and receiving dynamic range; finally, the receiving and transmitting device adopts a modularized design, so that the volume is reduced.

The above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; these modifications or substitutions do not depart from the essence of the corresponding technical solutions from the protection scope of the technical solutions of the embodiments of the present utility model.

Claims

1. The receiving and transmitting device for the ultrashort wave radio frequency communication is characterized by comprising a receiving module, a demodulating module and a modulating local oscillator module which are connected with each other; the receiving module is used for receiving signals and performing down-conversion on the received signals to intermediate frequency signals; the demodulation module is used for demodulating the intermediate frequency signal into a baseband signal, and collecting and outputting the baseband signal through AD; the modulation local oscillation module receives the baseband signal, generates a transmitting signal based on the baseband signal, simultaneously generates a receiving local oscillation signal, and feeds back the receiving local oscillation signal to the receiving module.

2. The transceiver device for ultrashort wave radio frequency communication according to claim 1, wherein the transceiver device is used for a radio frequency hardware link in a wireless communication system.

3. The transceiver device for ultrashort wave radio frequency communication according to claim 2, wherein the receiving module adopts a superheterodyne architecture, and the modulating local oscillation module directly transmits the transmission signal through a DDS.

4. The transceiver device for ultrashort wave radio frequency communication according to claim 1, wherein the receiving module comprises a low noise amplifier, a digital attenuator, and an electrically tunable filter.

5. The transceiver of claim 4, wherein the low noise amplifier is of SGA-4586 type and the digital attenuator is HMC542 type, and the electrically tunable filter is a 7-stage electrically tunable filter and is switched by an external control frequency.

6. The transceiver of claim 1, wherein the demodulation module comprises a mixer, a SAW and a demodulation chip, and generates two differential signals finally and sends the two differential signals to the modulation local oscillation module.

7. The transceiver of claim 6, wherein the mixer is model ADE-1+, the SAW is model TB0217A, and the demodulation chip is model AD6121.

8. The transceiver device for ultrashort wave radio frequency communication according to claim 1, wherein the modulation local oscillator module comprises a DDS unit, an FPGA and an AD.

9. The transceiver device for ultrashort wave radio frequency communication according to claim 8, wherein the DDS unit is of a model AD9910, the corresponding baseband signal and the receiving local oscillator signal are generated through the FPGA control, the AD is of a model AD9238, and the FPGA is of a model XC3S400-4PQ208I.