CN107786213A - A kind of device for lifting interference free performance - Google Patents
A kind of device for lifting interference free performance Download PDFInfo
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- CN107786213A CN107786213A CN201711065583.6A CN201711065583A CN107786213A CN 107786213 A CN107786213 A CN 107786213A CN 201711065583 A CN201711065583 A CN 201711065583A CN 107786213 A CN107786213 A CN 107786213A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
- H04B1/0053—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band
- H04B1/0057—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band using diplexing or multiplexing filters for selecting the desired band
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
- H04B1/12—Neutralising, balancing, or compensation arrangements
- H04B1/123—Neutralising, balancing, or compensation arrangements using adaptive balancing or compensation means
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
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Abstract
The device of present invention lifting interference free performance, including：Control centre, real time parsing base band obtain the working frequency points of the RF transceiver, then by instructing control frequency-selective filtering amplification module, link gain control module and mixing to amplify the running parameter of filtration module to the control signal of RF transceiver；The frequency-selective filtering amplification module, selection receive the signal of the RF transceiver working frequency points, are filtered and enhanced processing；The link gain control module, weigh with reference to the gain of whole piece link to adjust gain；The mixing amplification filtration module, is down-converted to intermediate-freuqncy signal by the signal by the link gain control module, is amplified filtering process in intermediate frequency, then upconverts to radiofrequency signal again, is sent into the RF transceiver processing.The device of present invention lifting interference free performance has the ability of stronger anti-interference, antiblocking and anti-intermodulation.
Description
Technical field
The present invention relates to communication equipment field, more particularly to a kind of device for lifting interference free performance.
Background technology
With developing rapidly for Europe network, GSM-R network has spread all over the every country in Europe, current European iron
The ER-GSM frequency ranges that road system uses, groundwork frequency range is up 873-880Mhz, descending 918-925Mhz.Due in recent years
Carry out UMTS, the fast development of LTE network, many 3G, 4G network distribution is in low frequency band, so thing followed signal interference
Problem also getting worse, in this case, GSM-R railway signals can be highly susceptible to the interference of public network signal, bring railway
The great risk of communication system.Between different public network signals, there may be one between public network signal and GSM-R network signal
The inter-modulated signal of series, the part in these intermodulation products can fall into the special frequency ranges of GSM-R, so as to produce with frequency or adjacent frequency
Interference, the downlink communication quality of railway mobile terminal is had a strong impact on, and then influence railway operation application.Therefore, 3GPP
TS102933 proposes stricter anti-interference test request specifically for this phenomenon, for CW signals, LTE signals in specification
Specific requirement is all made Deng interference, relative to conventional obstruction, intermodulation testing requirement, TS 102933 greatly improves requirement
Difficulty, in terms of conventional communications platform and hardware circuit, the requirement under new model can not be met.
The content of the invention
The invention aims to solve the problems of the prior art, a kind of device for lifting interference free performance is proposed.
The device of present invention lifting interference free performance, including：Control centre, control of the real time parsing base band to RF transceiver
Signal processed, the working frequency points of the RF transceiver are obtained, then by instructing control frequency-selective filtering amplification module, link gain
The running parameter of control module and mixing amplification filtration module；The frequency-selective filtering amplification module, selection receive the radio frequency and received
The signal of device working frequency points is sent out, is filtered and enhanced processing；The link gain control module, with reference to the gain of whole piece link
Weigh to adjust gain；The mixing amplification filtration module, the signal by the link gain control module is down-converted to
Intermediate-freuqncy signal, filtering process is amplified in intermediate frequency, then upconverts to radiofrequency signal again, is sent at the RF transceiver
Reason.
Preferably, the frequency-selective filtering amplification module includes two reception switches and at least two signalling channels, Mei Gesuo
Stating signalling channel includes wave filter and low-noise amplifier LNA, and the switch that receives is for the instruction control in the control centre
The lower selection of system receives the signal of the RF transceiver working frequency points, and selects the signalling channel needed for the working frequency points.
Preferably, the link gain control module includes at least one low-noise amplifier LNA and/or at least one declined
Subtract device.
Preferably, the mixing amplification filtration module includes frequency synthesizer, the first frequency mixer, intermediate frequency amplifier, intermediate frequency
Wave filter and the second frequency mixer, the frequency synthesizer are used to synthesize described first under the instruction control of the control centre
The local oscillation signal of frequency needed for frequency mixer and the second frequency mixer, first frequency mixer are used to carry out signal to be down-converted to intermediate frequency
Signal, the intermediate-freuqncy signal and then after the amplification of the intermediate frequency amplifier and intermediate-frequency filter and filtering process, into institute
The second frequency mixer is stated, second frequency mixer is sent into the RF transceiver processing after upconversion process is carried out to signal.
Preferably, the detailed process that the control centre obtains the working frequency points of the RF transceiver is：The base band
By to the RF transceiver transmission of control signals, to set the frequency of the RF transceiver work, the radio-frequency receiving-transmitting
A frequency synthesizer is used inside device, the RF transceiver configures its internal frequency according to the control signal of the base band
Integer part and fractional part parameter required for synthesizer, and the two parameters are preserved in both registers respectively, institute
Control centre is stated by obtaining described two parameters in real time it is known that the frequency of the RF transceiver work at present.
Preferably, used by the frequency-selective filtering amplification module low-noise amplifier LNA linear index IIP3
More than or equal to -20dbm, and the noise coefficient of the low-noise amplifier LNA is less than or equal to 3.
Preferably, used by the link gain control module low-noise amplifier LNA linear index IIP3
More than or equal to -20dbm, and the noise coefficient of the low-noise amplifier LNA is less than or equal to 3.
Preferably, the first frequency mixer and the second mixer linearity index IIP3 used by the mixing amplification filtration module
More than or equal to -20dbm.
Preferably, the device of the lifting interference free performance is applied in GSM-R network, the frequency-selective filtering amplifies mould
Block, selection receives the signal of the RF transceiver working frequency points, and the signal is divided into more than two passages, carries out single
Only filtering and/or enhanced processing, so as to completely separable, the realization on path by overseas GSM-R frequency ranges and EGSM frequency ranges
The overseas GSM-R frequency ranges and EGSM frequency ranges are separated on hardware.
Preferably, the frequency-selective filtering amplification module includes a signalling channel, the signalling channel include wave filter and
Low-noise amplifier LNA.
Compared with prior art, beneficial effects of the present invention have：
The device of present invention lifting interference free performance proposes radiofrequency signal carrying out parsing extraction process first, and will handle
Signal afterwards sends back to original system processing again, is so advantageous to carry out signal filtering process in intermediate frequency, enhances jamproof
Ability, it is preferable that by the way of channel multi-channel filter is divided, the signal of original frequency range is separately filtered in front end by the present invention,
So as to realize very specific narrow band signal processing, the ability of antiblocking and anti-intermodulation is added significantly to.
Brief description of the drawings
Fig. 1 is the overall structure block diagram of the device of present invention lifting interference free performance.
Fig. 2 is the particular circuit configurations block diagram of the device of present invention lifting interference free performance.
Fig. 3 is the particular circuit configurations figure of frequency-selective filtering amplification module of the present invention.
Fig. 4 is the particular circuit configurations figure of link gain control module of the present invention.
Fig. 5 is the part circuit structure figure of present invention mixing amplification filtration module.
Fig. 6 is the part circuit structure figure that present invention mixing amplification filtration module includes up-converter circuit.
Fig. 7 is the part circuit structure figure that present invention mixing amplification filtration module includes frequency synthesizer.
Embodiment
With reference to embodiment and compare accompanying drawing the present invention is described in further details.Wherein identical accompanying drawing
Mark represents identical part, unless stated otherwise.It is emphasized that what the description below was merely exemplary, without
It is to limit the scope of the present invention and its application.
The present invention proposes a kind of device for lifting interference free performance, in explanation below, present invention lifting anti-interference
The device of energy is illustrated exemplified by applying in GSM-R network, but is not intended to limit and is applied in GSM-R network, any other
Every directly or indirectly being intended to be included within protection scope of the present invention using the present invention program in network.
In order to overcome influence of the public network for GSM-R network, particularly public network interferes to GSM-R network
The reduction of caused GSM-R network communication quality level, the device of interference free performance can be lifted by the present invention to be improved.
The implementation checking of the device of present invention lifting interference free performance is the platform based on Skyworks, and major part in the market is main
Levelling platform is designed both for consumer market, including high pass, MTK, the Mainstream Platform such as spreadtrum, is all unable to reach specification
TS102933 performance requirement, so can more embody the outstanding feature of the device of present invention lifting interference free performance.
Fig. 1 is the overall structure block diagram of the device of present invention lifting interference free performance, is mainly received including duplexer, radio frequency
Send out device, base band, in addition to control centre 1, frequency-selective filtering amplification module 2, link gain control module 3, mixing amplification filtering mould
Block 4, annexation between each device and module as shown in figure 1, control centre 1 respectively with frequency-selective filtering amplification module 2, chain
Road gain control module 3, mixing amplification filtration module 4 electrically connect, and can obtain control of the base band to RF transceiver in real time
Signal processed, the control signal by real time parsing base band to RF transceiver, obtains the working frequency points of RF transceiver, Ran Houtong
Instruction control frequency-selective filtering amplification module 2, link gain control module 3, the running parameter of mixing amplification filtration module 4 are crossed, most
The original signal of RF transceiver is restored eventually, so as to realize the cooperative cooperating of external radio frequency receiving circuit and RF transceiver.
It can be seen in fig. 1 that one end of frequency-selective filtering amplification module 2 electrically connects with duplexer, the other end and link
Gain control module 3 electrically connects, under the control instruction of control centre 1, selection to receive above-mentioned RF transceiver work frequency
The signal of point, and splits the signal into more than one passage, is filtered and enhanced processing, it is preferable that frequency-selective filtering amplifies
Module 2 divides the signal into more than two passages, carries out individually filtering and enhanced processing for each passage, passes through this side
The filtering of formula, it can significantly lift the interference free performance of each specific frequency.One end of link gain control module 3 and frequency-selecting
Filter and amplification module 2 electrically connects, and the other end electrically connects with mixing amplification filtration module 4, and link gain control module 3 includes amplification
Part and attenuation portions, under the control instruction of control centre 1, weighing with reference to the gain of whole piece link to adjust gain.
One end of mixing amplification filtration module 4 electrically connects with link gain control module 3, and the other end electrically connects with RF transceiver, uses
Under the control instruction in control centre 1, the signal by link gain control module 3 is down-converted to intermediate-freuqncy signal, in
Frequency is amplified filtering process, then upconverts to radiofrequency signal again, is sent into RF transceiver processing.
Fig. 2 is the particular circuit configurations block diagram of the device of present invention lifting interference free performance, it is seen from figure 2 that, in Fig. 1
Control centre 1 refers specifically to MCU in fig. 2, in Fig. 1 frequency-selective filtering amplification module 2 specifically include in fig. 2 two receive switch,
Two wave filters and two low-noise amplifier LNA, the annexation between each device is as shown in Fig. 2 one of receive
One end of switch electrically connects with duplexer, and the other end electrically connects with two wave filters respectively, and one end of two wave filters is with connecing
Switch electrical connection is received, the other end electrically connects with two low-noise amplifier LNA respectively, two low-noise amplifier LNA one end
Electrically connected respectively with two wave filters, the other end electrically connects with another reception switch, and MCU controls two to receive switch, makes it
The signal of above-mentioned RF transceiver working frequency points is received, and splits the signal into two passages, individually filter and amplify
Handle, filtering in this way, can significantly lift the interference free performance of each specific frequency.In addition, in this implementation
In example, two wave filters and two LNA position relationship can be exchanged mutually, both can first filter and amplify again, can also
First amplify and filter again, depending on specific performance requirement.
In addition, in another embodiment of the present invention, frequency-selective filtering amplification module 2 can also specifically include two receptions
Switch and more than two signalling channels, each signalling channel include wave filter and low-noise amplifier LNA, wave filter and low noise
Acoustic amplifier LNA quantity does not limit, and reception switch is used under the instruction control of the control centre described in selection reception
The signal of RF transceiver working frequency points, and more than two passages are splitted the signal into, carry out at individually filtering and amplification
Reason.In another embodiment of the present invention, frequency-selective filtering amplification module 2 can also specifically include a signalling channel, the letter
Number passage includes wave filter and low-noise amplifier LNA, same wave filter and low-noise amplifier LNA quantity do not limit.
Fig. 1 links gain control module 3 specifically includes a low-noise amplifier LNA and an attenuator in fig. 2,
Mixing amplification filtration module 4 specifically includes frequency synthesizer, the first frequency mixer, intermediate frequency amplifier, intermediate frequency filter in fig. 2 in Fig. 1
Ripple device and the second frequency mixer, MCU control attenuator in link gain control module 3 to carry out appropriate decay, prevent input to be mixed
It is excessive to amplify the signal intensity of the intermediate frequency amplifier in filtration module 4, causes to produce non-linear amplification and then causes distorted signals.
Frequency synthesizer in MCU control mixing amplification filtration modules 4 synthesizes frequency needed for first frequency mixer and the second frequency mixer
Local oscillation signal.In the present invention, the position relationship of low-noise amplifier LNA and attenuator is in link gain control module 3
Can mutually it exchange, depending on specific performance requirement.
In addition, in another embodiment of the present invention, link gain control module 3 can also include more than two low
Noise amplifier LNA and more than two attenuators.In another embodiment of the present invention, link gain control module 3
More than one low-noise amplifier LNA can be included, but does not include attenuator.In another embodiment of the present invention, chain
Road gain control module 3 can also include more than one attenuator, but not include low-noise amplifier LNA.That is, chain
Whether road gain control module 3 specifically includes low-noise amplifier LNA or attenuator, and specifically uses low-noise amplifier
LNA or attenuator number, it will be determined on a case-by-case basis, not limit herein.
Annexation in mixing amplification filtration module 4 between each device as shown in Fig. 2 the first frequency mixer it is defeated all the way
Enter the signal synthesized for the output signal of link gain control module 3, another way input for frequency synthesizer, the first frequency mixer
Down coversion is act as, signal is mixed to intermediate-freuqncy signal, then carrying out signal by audio amplifier part is amplified into intermediate frequency filter
Ripple device, other out-of-band interference signals are filtered out, subsequently into the second frequency mixer, the input all the way of the second frequency mixer is to be filtered by intermediate frequency
The filtered signal of ripple device, the signal that another way input synthesizes for frequency synthesizer, the second frequency mixer act as up-conversion, will
Intermediate-freuqncy signal is reduced into radiofrequency signal, is transported to RF transceiver processing.Channel selection filter can only be in centre frequency at present
Preferable frequency selectivity could be realized when relatively low in 200KHz bandwidth, the device of present invention lifting interference free performance is in intermediate frequency
The suppression to out-of-band interference is realized using intermediate-frequency filter.
In fig. 2, control signals of the MCU by real time parsing base band to RF transceiver, obtains the work of RF transceiver
Make frequency, specific resolving is：Base band is by RF transceiver transmission of control signals, to set RF transceiver to work
Frequency, use a frequency synthesizer inside RF transceiver, RF transceiver is configured in it according to the control signal of base band
Integer part required for the frequency synthesizer in portion, fractional part parameter, and the two parameters are stored in two deposits respectively
In device.MCU by obtaining the two parameters it is known that the frequency of RF transceiver work at present in real time, and then MCU leads to again
The frequency that instruction configures to control whole system to need is crossed, specifically, MCU is by instructing in control frequency-selective filtering amplification module 2
Two receive switch, it is received the signal of above-mentioned RF transceiver working frequency points；MCU controls mixing amplification filter by instructing
Frequency synthesizer in ripple module 4, make the local oscillation signal signal of frequency needed for its synthesizer mixer；MCU is by instructing Quality Initiative
Attenuator or low-noise amplifier LNA in road gain control module 3, it is carried out appropriate decay or amplification, prevent from inputting
The signal intensity of intermediate frequency amplifier is excessive or too small, causes to produce non-linear amplification and then causes distorted signals.
Fig. 3 is the particular circuit configurations figure of frequency-selective filtering amplification module 2.It is seen in figure 3 that frequency-selective filtering amplifies mould
Block 2 includes receiving switch 11 and receives 16, LNA of switch amplifying circuits 12 and LNA amplifying circuits 13, filter circuit 14 and filtered electrical
Road 15.Wherein, receive switch 11 and receive switch 16, for receiving above-mentioned RF transceiver work under MCU instruction control
The signal of frequency；LNA amplifying circuits 12 and LNA amplifying circuits 13 are respectively used to in 918-930MHz and 930-960MHz frequency ranges
Signal be amplified；Filter circuit 14 and filter circuit 15 are respectively used to passing through LNA amplifying circuits 12 and LNA amplifying circuits
13 signal is filtered processing, filters out out-of-band interference.
Fig. 4 is the particular circuit configurations figure of link gain control module 3.It can be seen in fig. 4 that link gain controls mould
Block 3 includes LNA amplifying circuits 21 and digital pad 22.Wherein, the effect of LNA amplifying circuits 21 is to being put by frequency-selective filtering
The signal of big module 2 is amplified, and the effect of digital pad 22 is to being declined by the signal of frequency-selective filtering amplification module 2
Subtract, the mass action of LNA amplifying circuits 21 and digital pad 22 is to ensure signal after the processing of whole piece link, and arrival is penetrated
The signal level of frequency receiver meets the requirements.Wherein, MCU is needed according to decay of the situation of whole piece link to digital pad 22
Value optimizes adjustment.
Fig. 5 is the part circuit structure figure of mixing amplification filtration module 4.In fig. 5 it may be seen that mixing amplification filtering mould
Block 4 includes lower frequency changer circuit 31, IF amplifier circuit 32 and intermediate frequency filtering circuit 33.Wherein, the effect of lower frequency changer circuit 31 is
Signal is mixed to intermediate-freuqncy signal, and the intermediate-freuqncy signal is transferred to IF amplifier circuit 32, is amplified through IF amplifier circuit 32
Afterwards, intermediate frequency filtering circuit 33 is reached, intermediate frequency filtering circuit 33 filters out other out-of-band interference signals.Channel selection filter at present
Preferable frequency selectivity can could be realized in 200KHz bandwidth when centre frequency is relatively low, the present invention first passes through down coversion electricity
Road 31 down-converts the signals to intermediate frequency, then utilizes suppression of the intermediate-frequency filter realization to out-of-band interference in intermediate frequency.
Fig. 6 and Fig. 7 is the part circuit structure figure of mixing amplification filtration module 4, and up-converter circuit 34 is included in Fig. 6,
Up-converter circuit 34 will pass through 33 filtered signal of intermediate frequency filtering circuit and carry out up-conversion, be reduced into radiofrequency signal.Wrapped in Fig. 7
Containing frequency synthesizer 41, the signal for the frequency needed for synthesis under MCU instruction control.
It is specific at of the invention one in order to verify lifting of the device of present invention lifting interference free performance to network performance
In embodiment, RF transceiver selects transceiver (SKY74117), and MCU is by monitoring the letter on transceiver (SKY74117) SPI
Breath, and to carrying out real time parsing comprising the current frequency word information for receiving channel.MCU is external according to the frequency word information being resolved to
Portion's frequency synthesizer, receiving channel and attenuator are configured, so as to realize external radio frequency receiving circuit and SKYWORKS radio circuits
Cooperative cooperating, the Frequency Band Selection of real-time control receiver module, realize the normal operation of whole system.And in the present embodiment
In, in the particular circuit configurations of the device of lifting interference free performance shown in Fig. 2, used LNA and frequency mixer are respectively provided with higher
Linear index IIP3, thus form a High Linear receiving circuit, and the output signal of the High Linear receiving circuit is in
Within the range of linearity of transceiver transceiver (SKY74117).
The present embodiment lifts the device of interference free performance, enables to corresponding network system to have preferable intermodulation suppression
Performance.Intermodulation generation it is often closely bound up with the linearity of receiving circuit, at present SKYWORKS platforms due to integration it is higher,
Its linear index IIP3 is undesirable, and the present embodiment in RF transceiver front end by increasing high linearity reception circuit, i.e.,
High Linear index IIP3 LNA (low-noise amplifier), MIXER (frequency mixer) device is selected, for example, from linear index IIP3
Low-noise amplifier LNA and frequency mixer MIXER more than or equal to -20dbm, it is preferable that be more than from linear index IIP3 or
Low-noise amplifier LNA and frequency mixer MIXER equal to 10dbm, it is highly preferred that being more than or equal to from linear index IIP3
40dbm low-noise amplifier LNA and frequency mixer MIXER, a High Linear receiving circuit is thus formed, and the present embodiment is high
The output signal of linear receiving circuit is within the range of linearity of transceiver (SKY74117), so as to ensure reception signal whole
Non-linear distortion will not occur in individual dynamic range, so as to improve the intermodulation suppression ability of system.
In addition, the device of the present embodiment lifting interference free performance, enables to corresponding network system to have preferable IM3
(the rank product of double-tone intermodulation three) rejection ability.The present embodiment lifts the device of interference free performance, and MCU is by monitoring transceiver
(SKY74117) information on SPI, and to carrying out real time parsing comprising the current frequency word information for receiving channel, according to parsing
Frequency judges the frequency range being presently in, and MCU matches somebody with somebody according to the frequency word being resolved to receiving switch, outside frequency synthesizer and attenuator
Put, and will receive switch received signal in frequency-selective filtering amplification module 2 and be divided into multiple passages, carry out individually filtering and
Enhanced processing, so as to by overseas GSM-R frequency ranges and EGSM frequency ranges on path it is completely separable, realize by overseas GSM-R frequency
Section and EGSM frequency ranges separate on hardware, and therefore, the present embodiment lifts the device of interference free performance, enables to corresponding network
System has preferable IM3 (the rank product of double-tone intermodulation three) rejection ability.
The present embodiment lifts the device of interference free performance, enables to corresponding network system that there is preferably obstruction to suppress
Ability.Influence blocking performance mainly has system noise factor and system phase noise, and what it is due to transceiver (SKY74117) is
System noise coefficient is 3.3dB, and the noise coefficient when block signal is -26dbm input blocker@3MHZ offset
Deteriorate as 5dB, so as to largely effect on the blocking performance of system, and the most critical factor for influenceing system noise factor is making an uproar for LNA
Sonic system number, so as to illustrate that the internal LNA of transceiver (SKY74117) noise coefficient is too high, so as to increase low noise in outside
The LNA of sonic system number replaces the internal LNA of transceiver (SKY74117), for example, increase for frequency-selective filtering amplification module 2 and link
LNA in beneficial control module 3,3 LNA is less than or equal to from noise coefficient, it is preferable that be less than or equal to from noise coefficient
1 LNA, it is highly preferred that being less than or equal to 0.5 LNA from noise coefficient, so as to the obstruction rejection ability of lifting system.
The present embodiment lifts the device of interference free performance, enables to corresponding network system that there is preferable adjacent frequency to suppress
Ability.It is to improve the frequency selectivity of GSM signals to suppress the most important method of adjacent frequency, and transceiver (SKY74117) is for space
The consideration of size, its internal channel model is that have a LC filter circuit, and its frequency selectivity is poor, and the signal of adjacent frequency is very
Easily it is leaked in useful signal, so as to influence adjacent frequency rejection ability.At present channel selection filter can only centre frequency compared with
Preferable frequency selectivity could be realized when low in 200KHz bandwidth, so the device of the present embodiment lifting interference free performance,
First by High Linear index IIP3 the first frequency mixer by EGSM/RGSM signal down coversions in filtration module 4 is amplified in mixing
To 70MHZ intermediate frequencies, the suppression to present channel out-of-band interference is realized using channel intermediate-frequency filter in intermediate frequency, is carried so as to reach
Rise the ability that adjacent frequency suppresses.
In the case of the device of no application present invention lifting interference free performance, most of chip platform on the market is equal
The newest anti-interference requirement of Europe can not be reached, whole communication system is determined mainly due to the characteristic of zero intermediate frequency scheme
Anti-interference level, for the latest requirement proposed in 3GPP TS102933 specifications, be even more difficult to.
Original gsm system selects 932MHz/1009 (- 101dbm) channel to have for blocking performance (CW interference signals)
With signal, useful signal intensity is -101dbm, is fixed at it at frequency deviation and adds non-modulation interference signal, specific test data is such as
Shown in table 1：
The blocking performance test result of 1 original gsm system of table
Original gsm system selects 932MHz/1009 (- 100dbm) respectively for intermodulation performance, useful signal, its useful letter
Number intensity is -100dbm, and the position of 4 channels adds non-modulation interference signal above and below its frequency, and code requirement is more than -39dbm,
The position of 8 channels adds GMSK modulation interference signal, and code requirement is more than -50dbm, while BER<2.4%, specifically test number
According to as shown in table 2：
The intermodulation testing result of 2 original gsm system of table
| f0 | F1 | F2 | BER (bit error rate) | |
| The frequency of interference signal | 932MHz | (929.2MHz unmodulated) | (928.4MHz modulation) | -- |
| Test value (dbm) | -- | -38 | -52.5 | 2% |
| Standard (dbm) | -- | ＞ -39 | ＞ -50 | 2% |
From the test result of Tables 1 and 2 can be seen that original gsm system block resistance and intermodulation performance it is poor, and
In this case, either optimize the matching performance of circuit, or optimize from software algorithm, effect is not very greatly, a lot
Performance at frequency deviation, or even can not all adjust.
Increase on former gsm system after the present invention lifts the device of interference free performance and (referred to as improve gsm system), GSM
The performance boost of system can be embodied significantly, improve gsm system for blocking performance (CW interference signals), choosing
932MHz/1009 (- 101dbm) channel is useful signal, and useful signal intensity is -101dbm, is fixed at it at frequency deviation and adds non-tune
Interference signal processed, specific test data are as follows：
Table 3 improves the blocking performance test result of gsm system
Improve gsm system and select 932MHz/1009 (- 100dbm) respectively for intermodulation performance, useful signal, its useful signal
Intensity is -100dbm, and the position of 4 channels adds non-modulation interference signal above and below its frequency, and code requirement is more than -39dbm, 8
The position of individual channel adds GMSK modulation interference signal, and code requirement is more than -50dbm, while BER<2.4%, specifically test number
According to as follows：
Table 4 improves the intermodulation testing result of gsm system
| f0 | F1 | F2 | BER (bit error rate) | |
| The frequency of interference signal | 932MHz | (929.2MHz unmodulated) | (928.4MHz modulation) | -- |
| Test value (dbm) | -- | -38 | -24.5 | 2% |
| Standard (dbm) | -- | ＞ -39 | ＞ -50 | 2% |
Can be seen that by the test result of table 3 and table 4 increases present invention lifting interference free performance on former gsm system
Device after, the block resistance and intermodulation performance of system have obtained lifting by a relatively large margin.And contrast table 1 and table 3
Test result can be evident that at the nearest frequency deviation of distance center frequency, interference free performance greatly improves
16dB or so, this is very rare in the prior art.
It is anti-interference for the anti-interference requirement that Europe is increasingly strict, especially TS102933 specifications, present invention lifting
The device of performance proposes radiofrequency signal extraction process first, and gives the signal after processing is loss-free again at original system
Reason, be so advantageous to carry out signal transacting in intermediate frequency, enhance jamproof ability.And present invention lifting interference free performance
Device employs a point mode for channel multi-channel filter, strengthens interference free performance, and the signal of original frequency range is separately filtered, can
To realize very specific narrow band signal processing, the ability of antiblocking and anti-intermodulation is added significantly to.
Above content is to combine specific preferred embodiment further description made for the present invention, it is impossible to is assert
The specific implementation of the present invention is confined to these explanations.For those skilled in the art, do not taking off
On the premise of from present inventive concept, some equivalent substitutes or obvious modification can also be made, and performance or purposes are identical, all should
When being considered as belonging to protection scope of the present invention.
Claims (10)
- A kind of 1. device for lifting interference free performance, it is characterised in that including：Control centre, real time parsing base band obtain the working frequency points of the RF transceiver to the control signal of RF transceiver, Then joined by instructing control frequency-selective filtering amplification module, link gain control module and mixing to amplify the work of filtration module Number；The frequency-selective filtering amplification module, selection receive the signal of the RF transceiver working frequency points, are filtered and amplify Processing；The link gain control module, weigh with reference to the gain of whole piece link to adjust gain；The mixing amplification filtration module, intermediate-freuqncy signal is down-converted to by the signal Jing Guo the link gain control module, Intermediate frequency is amplified filtering process, then upconverts to radiofrequency signal again, is sent into the RF transceiver processing.
- 2. the device of lifting interference free performance according to claim 1, it is characterised in that the frequency-selective filtering amplification module Switch and at least two signalling channels are received including two, each signalling channel includes wave filter and low-noise amplifier LNA, the switch that receives are used under the instruction control of the control centre select to receive the RF transceiver working frequency points Signal, and select the signalling channel needed for the working frequency points.
- 3. the device of lifting interference free performance according to claim 1, it is characterised in that the link gain control module Including at least one low-noise amplifier LNA and/or at least one attenuator.
- 4. the device of lifting interference free performance according to claim 1, it is characterised in that the mixing amplification filtration module Including frequency synthesizer, the first frequency mixer, intermediate frequency amplifier, intermediate-frequency filter and the second frequency mixer, the frequency synthesizer is used The local oscillation signal of frequency needed for first frequency mixer and the second frequency mixer is synthesized under the instruction control in the control centre, First frequency mixer is used to carry out signal to be down-converted to intermediate-freuqncy signal, then the intermediate-freuqncy signal is amplified by the intermediate frequency After the amplification of device and intermediate-frequency filter and filtering process, into second frequency mixer, second frequency mixer is carried out to signal The RF transceiver processing is sent into after upconversion process.
- 5. the device of lifting interference free performance according to claim 1, it is characterised in that the control centre obtains described The detailed process of the working frequency points of RF transceiver is：The base band is by the RF transceiver transmission of control signals, coming The frequency of the RF transceiver work is set, uses a frequency synthesizer inside the RF transceiver, the radio frequency is received Integer part and fractional part ginseng of the hair device according to required for the control signal of the base band configures its internal frequency synthesizer Number, and the two parameters are preserved in both registers respectively, the control centre by obtaining described two parameters in real time Just it is able to know that the frequency of the RF transceiver work at present.
- 6. the device of lifting interference free performance according to claim 2, it is characterised in that the frequency-selective filtering amplification module Used low-noise amplifier LNA linear index IIP3 is more than or equal to -20dbm, and the low noise amplification Device LNA noise coefficient is less than or equal to 3.
- 7. the device of lifting interference free performance according to claim 3, it is characterised in that the link gain control module Used low-noise amplifier LNA linear index IIP3 is more than or equal to -20dbm, and the low noise amplification Device LNA noise coefficient is less than or equal to 3.
- 8. the device of lifting interference free performance according to claim 4, it is characterised in that the mixing amplification filtration module Used first frequency mixer and the second mixer linearity index IIP3 are more than or equal to -20dbm.
- 9. according to the device of any described lifting interference free performances of claim 1-8, it is characterised in that the lifting is anti-interference The device of performance is applied in GSM-R network, the frequency-selective filtering amplification module, and selection receives the RF transceiver work frequency The signal of point, and the signal is divided into more than two passages, individually filtering and/or enhanced processing are carried out, so as to By overseas GSM-R frequency ranges and EGSM frequency ranges on path it is completely separable, realizing will described abroad GSM-R frequency ranges and EGSM frequency ranges exists Separated on hardware.
- 10. the device of lifting interference free performance according to claim 1, it is characterised in that the frequency-selective filtering amplifies mould Block includes a signalling channel, and the signalling channel includes wave filter and low-noise amplifier LNA.
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| CN111835368A (en) * | 2020-07-31 | 2020-10-27 | 海能达通信股份有限公司 | Zero intermediate frequency receiving system |
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Also Published As
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| CN107786213B (en) | 2019-07-30 |
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