CN202750081U - Software defined radio receiver comprising multi-level automatic gain control modules - Google Patents
Software defined radio receiver comprising multi-level automatic gain control modules Download PDFInfo
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- CN202750081U CN202750081U CN 201220272421 CN201220272421U CN202750081U CN 202750081 U CN202750081 U CN 202750081U CN 201220272421 CN201220272421 CN 201220272421 CN 201220272421 U CN201220272421 U CN 201220272421U CN 202750081 U CN202750081 U CN 202750081U
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Abstract
The utility model relates to a software defined radio receiver comprising multi-level automatic gain control modules. The software defined radio receiver includes an antenna, a low-noise amplifier, a radio frequency filter, a mixer, a filter, an analog-to-digital converter and an FPGA module which are connected in sequence. A direct digital frequency synthesizer is connected into the mixer, and the radio frequency filter and the mixer are connected with a radio frequency automatic gain control module. The low-noise amplifier and/or the radio frequency filter are (is) respectively connected with a first-level analog automatic gain control module and a second-level analog automatic gain control module. The radio frequency automatic gain control module comprises a digital automatic gain control sub-module, a digital-to-analog converter and a gain controller in the FPGA module. The two analog automatic gain control modules having the same structure both include a variable gain amplifying/attenuating device, an amplifier, an automatic gain control detector, a direct current amplifier and a low-pass filter. With the multi-level analog and digital automatic gain control modules, the receiver is advantageous in high-accuracy power control, large dynamic range in control, relatively simple overall structure, high performance and low cost.
Description
Technical field
The utility model relates to the software and radio technique field, is specially a kind of software radio receiver that comprises the multi-stage automatic gain control module.
Background technology
Receiver is the important component part in the wireless communication system, for overcoming the technical limitations such as conventional wireless electricity receiver function is single, functional expansionary is poor, software radio (Software Defined Radio has appearred, SDR) technology, this technology is take standardization, modular hardware configuration as communications platform, fully use Digital Signal Processing, by realizing different communication functions in the different software algorithm of same hardware platform operation.Using the receiver of software and radio technique is a kind of advanced person's design philosophy, its key technology is to the close as much as possible antenna of the processing of radiofrequency signal, so need to be to the radiofrequency signal processing such as sample, so just need to carry out power control to the radiofrequency signal before the analog/digital signal sampling, guarantee the dynamic range performance of receiver.
And the preferred plan that guarantees receiver dynamic range is exactly automatic gain control (Auto Gain Control, AGC).Mostly be in the tradition receiver by the simulation automatic gain control circuit, directly analog radio-frequency signal carried out power detection, then control variable gain amplifier or attenuator, this method is difficult to realize higher precision control and larger dynamic range.Along with the progress of technology, digital automatic gain control program has appearred again, and can improve the deficiency of traditional automatic gain control circuit, but have baroque problem, aspect receiver dynamic range, still there is in addition certain skill upgrading space.
The utility model content
The purpose of this utility model provides a kind of software radio receiver that comprises the multi-stage automatic gain control module, receiver comprises simulation automatic gain control module and digital Auto Gain control module, improves the dynamic range of gain control precision, increase receiver.
The software radio receiver that comprises the multi-stage automatic gain control module of the utility model design, comprise the antenna, low noise amplifier, radio-frequency filter, frequency mixer, filter, analog to digital converter and the field programmable gate array module that are linked in sequence, Direct Digital Frequency Synthesizers access frequency mixer is connected to radio frequency automatic gain control module at radio-frequency filter and frequency mixer.
Described radio frequency automatic gain control module comprises digital Auto Gain control submodule, digital to analog converter and the gain controller (Gain Ctrl) of field programmable gate array inside modules, the digital Auto Gain control submodule of field programmable gate array module is through digital to analog converter insertion gain controller, and gain controller is connected between radio-frequency filter and the frequency mixer.
Power and the decoding of field programmable gate array module controls complete machine, detection digital baseband signal in this receiver; Frequency mixer and direct synthesizer are finished the down-conversion of radio frequency analog signal.
The output of the low noise amplifier of this receiver connects first order simulation automatic gain control module, the input of the latter's output access low noise amplifier; And/or the output of the radio-frequency filter of this receiver connects second level simulation automatic gain control module, the input of the latter's output access radio-frequency filter.
Described first order simulation automatic gain control module is identical with second level simulation automatic gain control module structure, includes variable gain amplification/attenuation device, amplifier, after detector, direct current amplifier and low pass filter.The signal access variable gain amplification/attenuation device of input, output signal behind amplifier, the output of amplifier also connects after detector, direct current amplifier and low pass filter, the output access variable gain amplification/attenuation device of low pass filter.
The advantage that the utility model comprises the software radio receiver of multi-stage automatic gain control module is: 1, the multi-stage automatic gain control module fully combines the characteristics of simulation automatic gain control module and digital Auto Gain control module, realize high-precision power control, and the dynamic range of receiver control is larger; 2, the complete machine hardware configuration is relatively simple, and high-performance, low cost are fit to apply.
Description of drawings
Fig. 1 is for originally comprising the software radio receiver example structure block diagram of multi-stage automatic gain control module;
Fig. 2 is the structured flowchart of the first order or second level simulation automatic gain control module among Fig. 1.
Embodiment
Originally comprise the software radio receiver example structure of multi-stage automatic gain control module as shown in Figure 1, comprise the antenna, low noise amplifier LNA, radio-frequency filter RF Filter, radio frequency automatic gain control module RFAGC, frequency mixer, filter, analog to digital converter ADC and the field programmable gate array FPGA module that are linked in sequence, Direct Digital Frequency Synthesizers access frequency mixer.
Described radio frequency automatic gain control module comprises digital Auto Gain control submodule, digital to analog converter DAC and the gain controller Gain Ctrl of field programmable gate array inside modules, the digital Auto Gain control submodule of field programmable gate array module is through digital to analog converter insertion gain controller Gain Ctrl, and gain controller Gain Ctrl is connected between radio-frequency filter RF Filter and the frequency mixer.
The output of the low noise amplifier of this receiver connects first order simulation automatic gain control module, the input of the latter's output access low noise amplifier; The output of the radio-frequency filter of this receiver connects second level simulation automatic gain control module, the input of the latter's output access radio-frequency filter.
Described first order simulation automatic gain control module is identical with second level simulation automatic gain control module structure, as shown in Figure 2, include variable gain amplification/attenuation device, amplifier A, the control of simulation automatic gain (AGC) wave detector, direct current amplifier DA and low pass filter LPF.The signal access variable gain amplification/attenuation device of input, output signal behind amplifier A, the output of amplifier A also connects automatic gain control (AGC) wave detector, direct current amplifier DA and low pass filter LPF, the output access variable gain amplification/attenuation device of low pass filter LPF.
Field programmable gate array module FPGA is the Clone III of altera corp family chip in this example, takes full advantage of the control function that the built-in Nios II embedded software core processor of FPGA is finished receiver.
Antenna receiving signal f1 frequency range can be 300MHz～800MHz in the present embodiment, orthogonal frequency-division multiplex singal (the ofdm signal that this routine f1 is frequency 480MHz, bandwidth 2MHz, OFDM is the abbreviation of Orthogonal Frequency Division Multiplexing), the multiplication factor of low noise amplifier LNA is 10dB, the signal f1 of antenna reception at first sends among the low noise amplifier LNA and amplifies, when useful signal is exaggerated, noise signal is also amplified simultaneously, is conducive to the better filtering noise signal of radio-frequency filter RF Filter of rear class.The bandwidth of this routine radio-frequency filter RF Filter is 2MHz.The signal f1 that receives is subject to respectively the control of the first order and second level simulation automatic gain control module (AGC1 and AGC2) through low noise amplifier LNA and radio-frequency filter RF Filter the time, advance the power coarse adjustment according to the power of input signal respectively.In the first order and the second level simulation automatic gain control module wherein the AGC wave detector formed by transistor circuit, after producing control voltage process direct current amplifier and low pass filter, act on variable gain amplification/attenuation device, the power of control inputs analog signal is to improve the dynamic range of receiver.Signal after the process radio-frequency filter RF Filter is sent into and is carried out analog down in the frequency mixer, wherein the needed local oscillation signal f2 of frequency mixer is provided by direct synthesizer, the local frequency f2 that this routine Direct Digital Frequency Synthesizers provides is 481MHz by application configuration, mixing obtains signal f3 through frequency mixer, comprise 1MHz in this routine f3 frequency spectrum, 480MHz, the frequency content of 481MHz and 961MHz, through the unwanted high fdrequency component of filter filtering, reserve frequency is the simulation Low Medium Frequency signal of 1MHz, to simulate the Low Medium Frequency signal through modulus converter A/D again is converted to digital signal and inputs field programmable gate array module FPGA, at first carry out at the scene Digital Down Convert DDC among the programmable gate array module FPGA and obtain baseband signal, and carried out the power calculation of digital baseband signal by the digital Auto Gain of field programmable gate array module FPGA control submodule, compare with reference value, the power control word of the digital Auto Gain control that obtains, digital to analog converter D/A through 8 of single channels is converted to the simulation controlled quentity controlled variable, send into radio frequency automatic gain control module RFAGC, finishing this routine third level automatic gain control is the power control that the radio frequency automatic gain is controlled RFAGC, realization is to the further accurately control of input signal power, and the control reference voltage of this routine radio frequency automatic gain control is 0～4V.At last, the decoding of finishing at the scene the orthogonal frequency division multiplex OFDM baseband signal among the programmable gate array module FPGA is processed.
The phase-locked loop pll frequency synthesizer that this routine Direct Digital Frequency Synthesizers is built-in voltage controlled oscillator VCO produces the required local oscillation signal of frequency mixer in conjunction with external loop-around filter circuit and external reference clock.The external reference frequency of this routine Direct Digital Frequency Synthesizers is provided as reference clock by the external crystal-controlled oscillation of 20MHz, and the external loop-around filter circuit is comprised of the RC passive device.
Above-described embodiment only is the specific case that the purpose of this utility model, technical scheme and beneficial effect are further described, and the utility model is not to be defined in this.All any modifications of within scope of disclosure of the present utility model, making, be equal to replacement, improvement etc., all be included within the protection range of the present utility model.
Claims (4)
1. the software radio receiver that comprises the multi-stage automatic gain control module, comprise the antenna, low noise amplifier, radio-frequency filter, frequency mixer, filter, analog to digital converter and the field programmable gate array module that are linked in sequence, Direct Digital Frequency Synthesizers access frequency mixer is characterized in that:
Described radio-frequency filter and frequency mixer are connected to radio frequency automatic gain control module.
2. the software radio receiver that comprises the multi-stage automatic gain control module according to claim 1 is characterized in that:
Described radio frequency automatic gain control module comprises digital Auto Gain control submodule, digital to analog converter and the gain controller of field programmable gate array inside modules, the digital Auto Gain control submodule of field programmable gate array module is through digital to analog converter insertion gain controller, and gain controller is connected between radio-frequency filter and the frequency mixer.
3. the software radio receiver that comprises the multi-stage automatic gain control module according to claim 1 and 2 is characterized in that:
The output of described low noise amplifier connects first order simulation automatic gain control module, the input of the latter's output access low noise amplifier; And/or the output of the radio-frequency filter of this receiver connects second level simulation automatic gain control module, the input of the latter's output access radio-frequency filter.
4. the software radio receiver that comprises the multi-stage automatic gain control module according to claim 3 is characterized in that:
Described first order simulation automatic gain control module is identical with second level simulation automatic gain control module structure, includes variable gain amplification/attenuation device, amplifier, simulation after detector, direct current amplifier and low pass filter; The signal access variable gain amplification/attenuation device of input, output signal behind amplifier, the output of amplifier is connecting analog after detector, direct current amplifier and low pass filter also, the output access variable gain amplification/attenuation device of low pass filter.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201220272421 CN202750081U (en) | 2012-06-11 | 2012-06-11 | Software defined radio receiver comprising multi-level automatic gain control modules |
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| CN 201220272421 CN202750081U (en) | 2012-06-11 | 2012-06-11 | Software defined radio receiver comprising multi-level automatic gain control modules |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104092471A (en) * | 2014-07-04 | 2014-10-08 | 三维通信股份有限公司 | High-dynamic high-gain broadband receiver |
| CN104393885A (en) * | 2014-11-26 | 2015-03-04 | 成都中远信电子科技有限公司 | Receiving terminal and method for ground-air broadband communication system for unmanned aerial vehicle |
| CN105871481A (en) * | 2016-06-24 | 2016-08-17 | 成都成广电视设备有限公司 | Automatic gain control method and device for radio frequency receiver |
| CN107112966A (en) * | 2014-12-15 | 2017-08-29 | 北欧半导体公司 | The radio receiver based on packet with automatic growth control |
| CN110011678A (en) * | 2019-04-25 | 2019-07-12 | 南京信息职业技术学院 | Automatic gain control system and method suitable for superheterodyne receiver of abrupt channel |
| CN114244379A (en) * | 2021-12-20 | 2022-03-25 | 北京福瑞航行科技有限公司 | Large dynamic RDSS automatic gain control receiver system and control method |
| CN114374401A (en) * | 2021-12-18 | 2022-04-19 | 武汉力通通信有限公司 | Automatic gain control radio frequency receiver |
-
2012
- 2012-06-11 CN CN 201220272421 patent/CN202750081U/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104092471A (en) * | 2014-07-04 | 2014-10-08 | 三维通信股份有限公司 | High-dynamic high-gain broadband receiver |
| CN104393885A (en) * | 2014-11-26 | 2015-03-04 | 成都中远信电子科技有限公司 | Receiving terminal and method for ground-air broadband communication system for unmanned aerial vehicle |
| CN104393885B (en) * | 2014-11-26 | 2016-08-31 | 成都中远信电子科技有限公司 | A kind of reception terminal for unmanned plane ground-to-air wideband communication system and method thereof |
| CN107112966A (en) * | 2014-12-15 | 2017-08-29 | 北欧半导体公司 | The radio receiver based on packet with automatic growth control |
| CN107112966B (en) * | 2014-12-15 | 2020-09-08 | 北欧半导体公司 | Packet-based radio receiver with automatic gain control |
| CN105871481A (en) * | 2016-06-24 | 2016-08-17 | 成都成广电视设备有限公司 | Automatic gain control method and device for radio frequency receiver |
| CN105871481B (en) * | 2016-06-24 | 2019-01-08 | 成都成广电视设备有限公司 | A kind of radio-frequency transmitter auto gain control method and device |
| CN110011678A (en) * | 2019-04-25 | 2019-07-12 | 南京信息职业技术学院 | Automatic gain control system and method suitable for superheterodyne receiver of abrupt channel |
| CN110011678B (en) * | 2019-04-25 | 2024-03-01 | 南京信息职业技术学院 | Automatic gain control system and method suitable for superheterodyne receiver of abrupt channel |
| CN114374401A (en) * | 2021-12-18 | 2022-04-19 | 武汉力通通信有限公司 | Automatic gain control radio frequency receiver |
| CN114244379A (en) * | 2021-12-20 | 2022-03-25 | 北京福瑞航行科技有限公司 | Large dynamic RDSS automatic gain control receiver system and control method |
| CN114244379B (en) * | 2021-12-20 | 2023-06-02 | 北京福瑞航行科技有限公司 | Large dynamic RDSS automatic gain control receiver system and control method |
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Granted publication date: 20130220 Termination date: 20130611 |