CN103986535B - A kind of test receiver can accept the device of frequency shift (FS) - Google Patents
A kind of test receiver can accept the device of frequency shift (FS) Download PDFInfo
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- CN103986535B CN103986535B CN201410233763.0A CN201410233763A CN103986535B CN 103986535 B CN103986535 B CN 103986535B CN 201410233763 A CN201410233763 A CN 201410233763A CN 103986535 B CN103986535 B CN 103986535B
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Abstract
The invention discloses the device that a kind of test receiver can accept frequency shift (FS), it is characterized in that, comprise the band pass filter that input is connected with transmitter, the output of described band pass filter is connected with AD converter, described AD converter is connected with a memory, described memory is connected with the variable frequency playback module that can change output frequency, described variable frequency playback module comprises D/A converter and Direct Digital Synthesizer, described D/A converter input respectively with memory, the output of Direct Digital Synthesizer is connected, D/A converter output is connected with receiver inlet by signal conditioning circuit, the input of described Direct Digital Synthesizer is connected with the output of receiver by numerical value comparative device.Structure is simple, when staying out of the original circuit of receiver, is convenient for measuring the accepted frequency shift (FS) index of receiver.
Description
Technical field
The present invention relates to the device that a kind of test receiver can accept frequency shift (FS).
Background technology
Receiver generally comprises antenna, filter, amplifier, A/D converter etc., needs measuring receiver to accept the technical indicators such as frequency shift (FS) in receiver performance index test.Because the centre frequency, modulation system etc. of various communication module are different, and the message frame form of communication also has very big-difference, and the simulation realizing transmitter signal is comparatively difficult.In the performance parameter test process of the transceiver communication such as carrier wave, small wireless module, often can run into the centre carrier frequency that test side cannot change transmitter, and cause receiver can accept frequency shift (FS) index cannot testing.By changing the circuit parameter of transmitter, change its tranmitting frequency to detect the frequency shift (FS) receptivity of receiver, this mode often needs the technical support of communication equipment producer, need brokenly ring and get involved communication module, test process become complexity and also not there is versatility.
Summary of the invention
For the problems referred to above, the invention provides the device that a kind of test receiver can accept frequency shift (FS), structure is simple, when staying out of the original circuit of receiver, is convenient for measuring the accepted frequency shift (FS) index of receiver.
For realizing above-mentioned technical purpose, reach above-mentioned technique effect, the present invention is achieved through the following technical solutions:
A kind of test receiver can accept the device of frequency shift (FS), it is characterized in that, comprise the band pass filter that input is connected with transmitter, the output of described band pass filter is connected with AD converter, described AD converter is connected with a memory, described memory is connected with the variable frequency playback module that can change output frequency, described variable frequency playback module comprises D/A converter and Direct Digital Synthesizer, described D/A converter input respectively with memory, the output of Direct Digital Synthesizer is connected, D/A converter output is connected with receiver inlet by signal conditioning circuit, the input of described Direct Digital Synthesizer is connected with the output of receiver by numerical value comparative device.
The modulation signal with modulation intelligence that transmitter sends is sent to band pass filter, can for different channels bandwidth sum carrier frequency, pass band width and the centre frequency of band pass filter are set, bandpass filtering is carried out to the signal received, improve signal to noise ratio, improve the anti-aliasing ability of follow-up AD converter.AD converter carries out high-speed sampling to band pass filter output signal, the analog-to-digital conversion of settling signal, more than the twice of preferred sample frequency higher than modulation signal bandwidth, the feature of original signal can be kept, the digital signal of sampling is stored in high-capacity and high-speed memory, completes the digitized process of transmitter output signal sampling.
Variable frequency playback module completes the digital-to-analogue conversion process of transmitter output signal, because signal characteristic during sampling comprises in the data, the data that mass storage stores are exactly the data comprising signal useful component of sampling, these data are exported by D/A converter, complete digital to analog conversion.The analog carrier signal that variable frequency playback module produces sends into signal conditioning circuit, carries out signal smoothing filtering process, carries out amplitude arrangement to signal, make it to meet the requirement of receiver test to signal level.Variable frequency playback module is inner except high speed D/A converter, also has a Direct Digital Synthesizer, adopt Direct Digital, produce the refresh clock of high speed D/A converter, the Data Comparison error signal that Direct Digital Synthesizer can be exported by numerical value comparative device, change its output frequency, thus change the refresh rate of the built-in D/A converter of variable frequency playback module.
Numerical value comparative device word for word contrasts the demodulating data of input and the normal data of original storage, thus judges the correctness and the error rate that receive data.Numerical value comparative device output error signal, to Direct Digital Synthesizer, changes the output frequency of Direct Digital Synthesizer.
When the playback frequency of variable frequency playback module D/A converter equals sample frequency, the frequency of output signal is not done to change; When changing the playback frequency of variable frequency playback module D/A converter, the frequency of output signal changes.If playback frequency is higher than sample frequency, then output signal frequency uprises, otherwise output signal frequency reduces, thus realizes the change of playback frequency.
Judge that can the signal of variable frequency playback module meet the requirement of receiver effective frequency range detection, first the playback frequency setting variable frequency playback module equals the sample frequency of high-speed sampling AD converter module, the then receivable center frequency signal of signal conditioning circuit output receiver, numerical value comparative device judges that can the result received meet the demands, increase or reduce the playback frequency of variable frequency playback module again, the signal that the receivable centre frequency of signal conditioning circuit output receiver departs from, numerical value comparative device continues to judge that can the result received meet the demands, until receiver cannot normally receive, by the upwards skew of variable frequency playback module with offset downward frequency and subtract each other, tested receiver can be obtained and can accept frequency shift (FS) index.
The invention has the beneficial effects as follows: structure is simple, when staying out of the original circuit of receiver, being convenient for measuring the accepted frequency shift (FS) index of receiver.
Accompanying drawing explanation
Fig. 1 is the structured flowchart that a kind of test receiver of the present invention can accept the device of frequency shift (FS).
Embodiment
Below in conjunction with accompanying drawing and specific embodiment, technical solution of the present invention is described in further detail, can better understand the present invention to make those skilled in the art and can be implemented, but illustrated embodiment is not as a limitation of the invention.
As shown in Figure 1, a kind of test receiver can accept the device of frequency shift (FS), comprises the band pass filter that input is connected with transmitter, and the output of described band pass filter is connected with AD converter, and wherein preferably AD converter is AD9235, realizes high sampling rate.Described AD converter is connected with a memory, and described memory is connected with the variable frequency playback module that can change output frequency, and preferred memory is high-capacity and high-speed memory, such as FLASH, DRAM etc., and capacity is generally greater than 2G.Described variable frequency playback module comprises D/A converter and Direct Digital Synthesizer, and D/A converter can be AD9754.Described D/A converter input is connected with the output of memory, Direct Digital Synthesizer respectively, D/A converter output is connected with receiver inlet by signal conditioning circuit, and the input of described Direct Digital Synthesizer is connected with the output of receiver by numerical value comparative device.Wherein, Direct Digital Synthesizer and numerical value comparative device can commercially have been bought, and belong to prior art.
The modulation signal with modulation intelligence that transmitter sends is sent to band pass filter, can for different channels bandwidth sum carrier frequency, pass band width and the centre frequency of band pass filter are set, bandpass filtering is carried out to the signal received, improve signal to noise ratio, improve the anti-aliasing ability of follow-up AD converter.AD converter carries out high-speed sampling to band pass filter output signal, the analog-to-digital conversion of settling signal, more than the twice of preferred sample frequency higher than modulation signal bandwidth, the feature of original signal can be kept, the digital signal of sampling is stored in high-capacity and high-speed memory, completes the digitized process of transmitter output signal sampling.
Variable frequency playback module completes the digital-to-analogue conversion process of transmitter output signal, because signal characteristic during sampling comprises in the data, the data that mass storage stores are exactly the data comprising signal useful component of sampling, these data are exported by D/A converter, complete digital to analog conversion.The analog carrier signal that D/A converter produces sends into signal conditioning circuit, carries out signal smoothing filtering process, carries out amplitude arrangement to signal, make it to meet the requirement of receiver test to signal level.Variable frequency playback module is inner except high speed D/A converter, also has a Direct Digital Synthesizer, adopt Direct Digital, produce the refresh clock of high speed D/A converter, the Data Comparison error signal that Direct Digital Synthesizer can be exported by numerical value comparative device, change its output frequency, thus change the refresh rate of the built-in D/A converter of variable frequency playback module.
Numerical value comparative device word for word contrasts the demodulating data of input and the normal data of original storage, thus judges the correctness and the error rate that receive data.Numerical value comparative device output error signal, to Direct Digital Synthesizer, changes the output frequency of Direct Digital Synthesizer.
When the playback frequency of variable frequency playback module D/A converter equals sample frequency, the frequency of output signal is not done to change; When changing the playback frequency of variable frequency playback module D/A converter, the frequency of output signal changes.If playback frequency is higher than sample frequency, then output signal frequency uprises, otherwise output signal frequency reduces, thus realizes the change of playback frequency.
Judge that can the signal of variable frequency playback module meet the requirement of receiver effective frequency range detection, first the playback frequency setting variable frequency playback module equals the sample frequency of high-speed sampling AD converter module, the then receivable center frequency signal of signal conditioning circuit output receiver, numerical value comparative device judges that can the result received meet the demands, increase or reduce the playback frequency of variable frequency playback module again, the signal that the receivable centre frequency of signal conditioning circuit output receiver departs from, numerical value comparative device continues to judge that can the result received meet the demands, until receiver cannot normally receive, by the upwards skew of variable frequency playback module with offset downward frequency and subtract each other, tested receiver can be obtained and can accept frequency shift (FS) index.
When staying out of the original circuit of receiver, realizing effective measurement that can accept frequency shift (FS) index to the receiver of different carrier frequencies and modulation system, being particularly suitable for the detection of the lower communication module performance of the communication frequencys such as power line carrier.
These are only the preferred embodiments of the present invention; not thereby the scope of the claims of the present invention is limited; every utilize specification of the present invention and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in the technical field that other are relevant, be all in like manner included in scope of patent protection of the present invention.
Claims (6)
1. a test receiver can accept the device of frequency shift (FS), it is characterized in that, comprise the band pass filter that input is connected with transmitter, the output of described band pass filter is connected with AD converter, described AD converter is connected with a memory, described memory is connected with the variable frequency playback module that can change output frequency, described variable frequency playback module comprises D/A converter and Direct Digital Synthesizer, described D/A converter input respectively with memory, the output of Direct Digital Synthesizer is connected, D/A converter output is connected with receiver inlet by signal conditioning circuit, the input of described Direct Digital Synthesizer is connected with the output of receiver by numerical value comparative device.
2. a kind of test receiver according to claim 1 can accept the device of frequency shift (FS), it is characterized in that, described memory is FLASH.
3. a kind of test receiver according to claim 1 can accept the device of frequency shift (FS), it is characterized in that, described memory is DRAM.
4. a kind of test receiver according to Claims 2 or 3 can accept the device of frequency shift (FS), it is characterized in that, described AD converter is AD9235.
5. a kind of test receiver according to claim 4 can accept the device of frequency shift (FS), it is characterized in that, described memory span is greater than 2G.
6. a kind of test receiver according to claim 5 can accept the device of frequency shift (FS), it is characterized in that, described D/A converter is AD9754.
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| CN101087159B (en) * | 2006-06-05 | 2011-03-09 | 中兴通讯股份有限公司 | A method for frequency deviation estimation |
| CN101729082A (en) * | 2008-10-31 | 2010-06-09 | 原相科技股份有限公司 | Centre frequency adjusting device for communication receiver and related method thereof |
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