CN107786213B - A kind of device promoting interference free performance - Google Patents
A kind of device promoting interference free performance Download PDFInfo
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- CN107786213B CN107786213B CN201711065583.6A CN201711065583A CN107786213B CN 107786213 B CN107786213 B CN 107786213B CN 201711065583 A CN201711065583 A CN 201711065583A CN 107786213 B CN107786213 B CN 107786213B
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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 promotion interference free performance, it include: control centre, control signal of the real time parsing base band to RF transceiver, the working frequency points of the RF transceiver are obtained, instruction control frequency-selective filtering amplification module, the running parameter of link gain control module and mixing amplification filter module are then passed through；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 adjusts gain in conjunction with the gain tradeoff of whole link；Filter module is amplified in the mixing, will be down-converted to intermediate-freuqncy signal by the signal of the link gain control module, amplifies filtering processing in intermediate frequency, then upconvert to radiofrequency signal again, is sent into the RF transceiver processing.The device that the present invention promotes 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, in particular to a kind of device for promoting interference free performance.
Background technique
With the rapid development of Europe network, GSM-R network is throughout the every country in Europe, current Europe iron
The ER-GSM frequency range that road system uses, groundwork frequency range are uplink 873-880Mhz, downlink 918-925Mhz.Due in recent years
Carry out UMTS, the fast development of LTE network, the network distribution of many 3G, 4G are in low frequency band, so the following signal interference
Problem is also got worse, and in this case, GSM-R railway signal can be highly susceptible to the interference of public network signal, brings 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, a part in these intermodulation products can fall into the dedicated frequency range of GSM-R, to generate with frequency or adjacent frequency
Interference seriously affects the downlink communication quality of railway mobile terminal, and then influences railway operation application.Therefore, 3GPP
TS102933 proposes stringenter anti-interference test request specifically for this phenomenon, for CW signal, LTE signal in specification
Specific requirement has all been made in equal interference, and relative to previous obstruction, intermodulation testing requirement, TS 102933 greatly improves requirement
Difficulty can no longer meet the requirement under new model in terms of previous communications platform and hardware circuit.
Summary of the invention
The purpose of the present invention is to solve the problems of the prior art, propose a kind of device for promoting interference free performance.
The device of present invention promotion interference free performance, comprising: control centre, control of the real time parsing base band to RF transceiver
Signal processed obtains the working frequency points of the RF transceiver, then passes through instruction control frequency-selective filtering amplification module, link gain
The running parameter of control module and mixing amplification filter module；The frequency-selective filtering amplification module, selection receive the radio frequency and receive
The signal for sending out device working frequency points, is filtered and enhanced processing；The link gain control module, in conjunction with the gain of whole link
Tradeoff is to adjust gain；Filter module is amplified in the mixing, will be down-converted to by the signal of the link gain control module
Intermediate-freuqncy signal amplifies filtering processing in intermediate frequency, then upconverts to radiofrequency signal again, be sent at the RF transceiver
Reason.
Preferably, the frequency-selective filtering amplification module includes two reception switches and at least two signal paths, Mei Gesuo
Stating signal path includes filter and low-noise amplifier LNA, and the reception switch 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 signal path needed for selecting the working frequency points.
Preferably, the link gain control module includes at least one low-noise amplifier LNA and/or at least one declines
Subtract device.
Preferably, the mixing amplification filter module includes frequency synthesizer, the first frequency mixer, intermediate frequency amplifier, intermediate frequency
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 point needed for frequency mixer and the second frequency mixer, first frequency mixer is for carrying out signal to be down-converted to intermediate frequency
Signal, the intermediate-freuqncy signal then after the amplification and filtering processing of the intermediate frequency amplifier and intermediate-frequency filter, into institute
The second frequency mixer is stated, second frequency mixer is sent into the RF transceiver processing after carrying out upconversion process to signal.
Preferably, the control centre obtains the detailed process of the working frequency points of the RF transceiver are as follows: the base band
By to the RF transceiver transmission of control signals, the frequency point of the RF transceiver work, the radio-frequency receiving-transmitting is arranged
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 required for synthesizer and fractional part parameter, and the two parameters are saved in both registers respectively, institute
State control centre pass through obtain described two parameters in real time it is known that the RF transceiver work at present frequency point.
Preferably, the linear index IIP3 of the low-noise amplifier LNA used by the frequency-selective filtering amplification module
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 linear index IIP3 of the low-noise amplifier LNA used by the link gain control module
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 filter module
More than or equal to -20dbm.
Preferably, the device for promoting 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 channels, carries out single
Only filtering and/or enhanced processing, so as to which overseas GSM-R frequency range and EGSM frequency range is completely separable on access, realization
The overseas GSM-R frequency range and EGSM frequency range are separated on hardware.
Preferably, the frequency-selective filtering amplification module include a signal path, the signal path include filter and
Low-noise amplifier LNA.
Compared with prior art, the beneficial effects of the present invention are as follows:
The device that the present invention promotes interference free performance, which is put forward for the first time, carries out parsing extraction process for radiofrequency signal, and will processing
Signal afterwards sends back to original system processing again, is conducive to carry out signal filtering processing in intermediate frequency in this way, enhance jamproof
Ability, it is preferable that by the way of dividing channel multi-channel filter, 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, it is added significantly to the ability of antiblocking and anti-intermodulation.
Detailed description of the invention
Fig. 1 is the overall structure block diagram for the device that the present invention promotes interference free performance.
Fig. 2 is the particular circuit configurations block diagram for the device that the present invention promotes 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 filter module.
Fig. 6 is the part circuit structure figure that present invention mixing amplification filter module includes up-converter circuit.
Fig. 7 is the part circuit structure figure that present invention mixing amplification filter module includes frequency synthesizer.
Specific embodiment
With reference to embodiment and compares attached drawing the present invention is described in further details.Wherein identical attached drawing
Label indicates identical component, unless stated otherwise.It is emphasized that following the description is only exemplary, without
It is to limit the scope of the invention and its apply.
The present invention proposes a kind of device for promoting interference free performance, and in explanation below, the present invention promotes anti-interference
The device of energy is illustrated for applying in GSM-R network, but is not intended to limit and is applied in GSM-R network, any other
All direct or indirect 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, especially public network interferes GSM-R network
The reduction of caused GSM-R network communication quality level, the device that can promote interference free performance through the invention are improved.
The implementation verifying that the present invention promotes the device of interference free performance is the platform based on Skyworks, and major part currently on the market is main
Levelling platform is designed both for consumer market, including high pass, MTK, and the Mainstream Platforms such as spreadtrum are all unable to reach specification
The performance requirement of TS102933, so can more embody the outstanding feature that the present invention promotes the device of interference free performance.
Fig. 1 is the overall structure block diagram for the device that the present invention promotes interference free performance, mainly includes duplexer, radio frequency receipts
Device, base band are sent out, further includes control centre 1, frequency-selective filtering amplification module 2, link gain control module 3, mixing amplification filtering mould
Block 4, connection relationship 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 filter module 4 are electrically connected, and can obtain control of the base band to RF transceiver in real time
Signal processed obtains the working frequency points of RF transceiver, then leads to by real time parsing base band to the control signal of RF transceiver
The running parameter of instruction control frequency-selective filtering amplification module 2, link gain control module 3, mixing amplification filter module 4 is crossed, most
The original signal of RF transceiver is restored eventually, to realize that external radio frequency receives the cooperative cooperating of circuit and RF transceiver.
It can be seen in fig. 1 that one end of frequency-selective filtering amplification module 2 is electrically connected with duplexer, the other end and link
Gain control module 3 is electrically connected, 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 channel, is filtered and enhanced processing, it is preferable that frequency-selective filtering amplification
Module 2 divides the signal into more than two channels, each channel is individually filtered and enhanced processing, and this side is passed through
The filtering of formula can significantly promote the interference free performance of each specific frequency point.One end of link gain control module 3 and frequency-selecting
Filter and amplification module 2 is electrically connected, and the other end is electrically connected with mixing amplification filter module 4, and link gain control module 3 includes amplification
Part and attenuation portions, for adjusting gain in conjunction with the gain tradeoff of whole link under the control instruction of control centre 1.
One end of mixing amplification filter module 4 is electrically connected with link gain control module 3, and the other end is electrically connected with RF transceiver, is used
Under the control instruction in control centre 1, it will be down-converted to intermediate-freuqncy signal by the signal of link gain control module 3, in
Frequency amplifies filtering processing, then upconverts to radiofrequency signal again, is sent into RF transceiver processing.
Fig. 2 is the particular circuit configurations block diagram for the device that the present invention promotes 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 included in Fig. 2 two receptions switch,
Two filters and two low-noise amplifier LNA, the connection relationship between each device is as shown in Fig. 2, one of receive
One end of switch is electrically connected with duplexer, and the other end is electrically connected with two filters respectively, one end of two filters with connect
Switch electrical connection is received, the other end is electrically connected with two low-noise amplifier LNA respectively, one end of two low-noise amplifier LNA
It is electrically connected respectively with two filters, the other end receives switch with another and is electrically connected, and MCU controls two reception switches, makes it
The signal of above-mentioned RF transceiver working frequency points is received, and splits the signal into two channels, is individually filtered and is amplified
Processing, filtering in this way can significantly promote the interference free performance of each specific frequency point.In addition, in this implementation
In example, the positional relationship of two filters and two LNA can be exchanged mutually, both can first be filtered and be amplified again, can also be with
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 signal paths, each signal path include filter and low-noise amplifier LNA, filter and low noise
There is no limit for the quantity of acoustic amplifier LNA, receives switch for described in the selection reception under the instruction of control centre control
The signal of RF transceiver working frequency points, and split the signal into more than two channels, individually filtered and amplification at
Reason.In another embodiment of the present invention, frequency-selective filtering amplification module 2 can also specifically include a signal path, the letter
Number channel includes filter and low-noise amplifier LNA, the quantity of same filter and low-noise amplifier LNA there is no limit.
Link gain control module 3 specifically includes a low-noise amplifier LNA and an attenuator in Fig. 2 in Fig. 1,
Mixing amplification filter module 4 specifically includes frequency synthesizer, the first frequency mixer, intermediate frequency amplifier, intermediate frequency filter in Fig. 2 in Fig. 1
Wave device and the second frequency mixer, MCU control attenuator in link gain control module 3 and carry out decaying appropriate, and input is prevented to be mixed
The signal strength for amplifying the intermediate frequency amplifier in filter module 4 is excessive, causes to generate nonlinear amplification and then leads to distorted signals.
Frequency point needed for frequency synthesizer in MCU control mixing amplification filter module 4 synthesizes first frequency mixer and the second frequency mixer
Local oscillation signal.In the present invention, the positional relationship of low-noise amplifier LNA and attenuator is in link gain control module 3
It can mutually exchange, depending on specific performance requirement.
In addition, in another embodiment of the present invention, link gain control module 3 also may 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
It may include more than one low-noise amplifier LNA, but do not include attenuator.In another embodiment of the present invention, chain
Road gain control module 3 also may include more than one attenuator, but not include low-noise amplifier LNA.That is, chain
Whether specific road gain control module 3 includes low-noise amplifier LNA or attenuator, and specifically uses low-noise amplifier
The number of LNA or attenuator, will be depending on the circumstances, it is not limited here.
Connection relationship in mixing amplification filter 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
Effect is down coversion, and signal is mixed to intermediate-freuqncy signal, then carries out signal by audio amplifier part and is amplified into intermediate frequency filter
Wave device filters out other out-of-band interference signals, and subsequently into the second frequency mixer, the input all the way of the second frequency mixer is to filter by intermediate frequency
The filtered signal of wave device, another way input are the signal of frequency synthesizer synthesis, and the effect of the second frequency mixer is 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 lower in 200KHz bandwidth, the present invention promotes the device of interference free performance in intermediate frequency
The inhibition to out-of-band interference is realized using intermediate-frequency filter.
In Fig. 2, MCU, to the control signal of RF transceiver, obtains the work of RF transceiver by real time parsing base band
Make frequency point, specific resolving are as follows: base band RF transceiver is arranged by working to RF transceiver transmission of control signals
Frequency point, a frequency synthesizer is used inside RF transceiver, RF transceiver configures 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 pass through obtain the two parameters in real time it is known that RF transceiver work at present frequency point, then MCU leads to again
Instruction is crossed to control the frequency point that whole system needs to configure, specifically, MCU passes through in instruction control frequency-selective filtering amplification module 2
Two receptions switch, so that it is received the signal of above-mentioned RF transceiver working frequency points；MCU passes through instruction control mixing amplification filter
Frequency synthesizer in wave module 4, the local oscillation signal signal of frequency point needed for making its synthesizer mixer；MCU passes through instruction Quality Initiative
Attenuator or low-noise amplifier LNA in road gain control module 3 make it carry out decaying or amplification appropriate, prevent from inputting
The signal strength of intermediate frequency amplifier is excessive or too small, causes to generate nonlinear amplification and then leads to 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 reception switch 16, LNA amplifying circuit 12 and LNA amplifying circuit 13, filter circuit 14 and filtered electrical
Road 15.Wherein, it receives switch 11 and receives switch 16, for receiving above-mentioned RF transceiver work under the instruction of MCU control
The signal of frequency point；LNA amplifying circuit 12 and LNA amplifying circuit 13 are respectively used to in 918-930MHz and 930-960MHz frequency range
Signal amplify；Filter circuit 14 and filter circuit 15 are respectively used to by LNA amplifying circuit 12 and LNA amplifying circuit
13 signal is filtered, and 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 circuit 21 and digital pad 22.Wherein, the effect of LNA amplifying circuit 21 is put to by frequency-selective filtering
The signal of big module 2 amplifies, and the effect of digital pad 22 is declined to by the signal of frequency-selective filtering amplification module 2
Subtract, the mass action of LNA amplifying circuit 21 and digital pad 22 is to guarantee signal after the processing of whole link, and arrival is penetrated
The signal level of frequency receiver meets the requirements.Wherein, MCU is needed according to decaying the case where whole link to digital pad 22
Value optimizes adjustment.
Fig. 5 is the part circuit structure figure of mixing amplification filter 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 lower, the present invention first passes through down coversion electricity
Road 31 down-converts the signals to intermediate frequency, then the inhibition in intermediate frequency using intermediate-frequency filter realization to out-of-band interference.
Fig. 6 and Fig. 7 is the part circuit structure figure of mixing amplification filter module 4, includes up-converter circuit 34 in Fig. 6,
Up-converter circuit 34 will carry out up-conversion by the filtered signal of intermediate frequency filtering circuit 33, be reduced into radiofrequency signal.It is wrapped in Fig. 7
Signal containing frequency synthesizer 41, for frequency point needed for being synthesized under the instruction control of MCU.
Promotion of the device of interference free performance to network performance is promoted in order to verify the present invention, it is specific at of the invention one
In embodiment, RF transceiver selects transceiver (SKY74117), and MCU passes through the letter on monitoring transceiver (SKY74117) SPI
Breath, and real time parsing is carried out to the frequency word information comprising currently receiving channel.MCU is external according to the frequency word information being resolved to
Portion's frequency synthesizer, receiving channel and attenuator are configured, to realize that external radio frequency receives circuit and SKYWORKS radio circuit
Cooperative cooperating controls and receives the Frequency Band Selection of module in real time, realizes the normal operation of whole system.And in the present embodiment
In, in particular circuit configurations that the device of interference free performance is promoted shown in Fig. 2, used LNA and frequency mixer all have higher
Linear index IIP3, thus constitute High Linear and receive circuit, and the High Linear receives the output signal of circuit and is in
Within the range of linearity of transceiver transceiver (SKY74117).
The present embodiment promotes the device of interference free performance, and corresponding network system is enabled to have preferable intermodulation suppression
Performance.Intermodulation generation often with receive circuit the linearity it is closely bound up, at present SKYWORKS platform due to integration it is higher,
Its linear index IIP3 is undesirable, and the present embodiment is by increasing high linearity reception circuit in RF transceiver front end, i.e.,
LNA (low-noise amplifier), MIXER (frequency mixer) device of High Linear index IIP3 are selected, for example, selecting linear index IIP3
Low-noise amplifier LNA and frequency mixer MIXER more than or equal to -20dbm, it is preferable that select linear index IIP3 be greater than or
Low-noise amplifier LNA and frequency mixer MIXER equal to 10dbm, it is highly preferred that linear index IIP3 is selected to be greater than or equal to
Thus the low-noise amplifier LNA and frequency mixer MIXER of 40dbm constitutes a High Linear and receives circuit, and the present embodiment is high
The linear output signal for receiving circuit is within the range of linearity of transceiver (SKY74117), to guarantee to receive signal whole
Non-linear distortion will not occur in a dynamic range, to improve the intermodulation suppression ability of system.
In addition, the present embodiment promotes the device of interference free performance, enable to corresponding network system that there is preferable IM3
(three rank product of double-tone intermodulation) rejection ability.The present embodiment promotes the device of interference free performance, and MCU passes through monitoring transceiver
(SKY74117) information on SPI, and real time parsing is carried out to the frequency word information comprising currently receiving channel, according to parsing
Frequency point judges the frequency range being presently in, and MCU matches according to the frequency word being resolved to switch, external frequency synthesizer and attenuator is received
Set, and switch received signal will be received in frequency-selective filtering amplification module 2 and be divided into multiple channels, carry out individually filtering and
Enhanced processing is realized overseas GSM-R frequency so as to overseas GSM-R frequency range and EGSM frequency range is completely separable on access
Section and EGSM frequency range separate on hardware, and therefore, the present embodiment promotes the device of interference free performance, enable to corresponding network
System has preferable IM3 (three rank product of double-tone intermodulation) rejection ability.
The present embodiment promotes the device of interference free performance, enables to corresponding network system that there is preferable obstruction to inhibit
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 be 3.3dB, and block signal be -26dbm input blocker@3MHZ offset when noise coefficient
Deteriorating is 5dB, so that the most critical factor for largely effecting on the blocking performance of system, and influencing system noise factor is making an uproar for LNA
Sonic system number, to illustrate that the noise coefficient of the internal LNA of transceiver (SKY74117) is too high, so as to increase low noise in outside
The LNA of sonic system number is come the LNA that replaces transceiver (SKY74117) internal, for example, increasing for frequency-selective filtering amplification module 2 and link
LNA in beneficial control module 3 selects noise coefficient to be less than or equal to 3 LNA, it is preferable that noise coefficient is selected to be less than or equal to
1 LNA, it is highly preferred that the LNA for selecting noise coefficient to be less than or equal to 0.5, thus the obstruction rejection ability of lifting system.
The present embodiment promotes the device of interference free performance, and corresponding network system is enabled to inhibit with preferable adjacent frequency
Ability.Inhibiting the most important method of adjacent frequency is to improve the frequency selectivity of GSM signal, and transceiver (SKY74117) is for space
The considerations of size, internal channel model is that have a LC filter circuit, and frequency selectivity is poor, and the signal of adjacent frequency is very
It is easy to be leaked in useful signal, 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 present embodiment promotes the device of interference free performance,
Amplify the first frequency mixer for passing through High Linear index IIP3 in filter module 4 first for EGSM/RGSM signal down coversion being mixed
To 70MHZ intermediate frequency, the inhibition to present channel out-of-band interference is realized using channel intermediate-frequency filter in intermediate frequency, is mentioned to reach
Rise the ability that adjacent frequency inhibits.
In the case where no application present invention promotes the device of interference free performance, most of chip platform on the market is equal
The newest anti-interference requirement of Europe cannot be reached, mainly since the characteristic of zero intermediate frequency scheme determines entire communication system
Anti-interference level the latest requirement that proposes in 3GPP TS102933 specification is even more difficult to realize.
For original gsm system for blocking performance (CW interference signal), selecting 932MHz/1009 (- 101dbm) channel is to have
With signal, useful signal intensity is -101dbm, fixes at frequency deviation at it and adds non-modulation interference signal, specific test data is such as
Shown in table 1:
The blocking performance test result of the original gsm system of table 1
Original gsm system selects 932MHz/1009 (- 100dbm) intermodulation performance, useful signal respectively, useful letter
Number intensity is -100dbm, and the position of 4 channels adds non-modulation interference signal above and below its frequency point, and code requirement is greater than -39dbm,
The position of 8 channels adds GMSK modulation interference signal, and code requirement is greater than -50dbm, while BER < 2.4%, specifically tests number
According to as shown in table 2:
The intermodulation testing result of the original gsm system of table 2
| 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, very much
Performance at frequency deviation, or even can not all adjust.
(gsm system is referred to as improved) after the device of increase present invention promotion interference free performance on former gsm system, GSM
The performance boost of system can be embodied significantly, improve gsm system for blocking performance (CW interference signal), choosing
932MHz/1009 (- 101dbm) channel is useful signal, and useful signal intensity is -101dbm, fixes at frequency deviation at it and adds non-tune
Interference signal processed, specific test data are as follows:
The blocking performance test result of the improvement gsm system of table 3
Gsm system is improved for intermodulation performance, useful signal selects 932MHz/1009 (- 100dbm), useful signal respectively
Intensity is -100dbm, and the position of 4 channels adds non-modulation interference signal above and below its frequency point, and code requirement is greater than -39dbm, 8
The position of a channel adds GMSK modulation interference signal, and code requirement is greater than -50dbm, while BER < 2.4%, specifically tests number
According to as follows:
The intermodulation testing result of the improvement gsm system of table 4
| 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% |
It can be seen that by the test result of table 3 and table 4 and increase present invention promotion interference free performance on former gsm system
Device after, the block resistance and intermodulation performance of system have obtained promotion 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 point, interference free performance is greatly improved
16dB or so, this is very rare in the prior art.
For the increasingly strict anti-interference requirement of Europe, especially TS102933 specification, the present invention is promoted anti-interference
The device of performance is put forward for the first time radiofrequency signal extraction process, and will treated that signal is loss-free again gives at original system
Reason is conducive to carry out signal processing in intermediate frequency in this way, enhances jamproof ability.And the present invention promotes interference free performance
Device strengthens interference free performance by the way of dividing channel multi-channel filter, and the signal of original frequency range is separately filtered, can
To realize very specific narrow band signal processing, it is added significantly to the ability of antiblocking and anti-intermodulation.
The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be said that
Specific implementation of the invention is only limited to these instructions.For those skilled in the art to which the present invention belongs, it is not taking off
Under the premise of from present inventive concept, several equivalent substitute or obvious modifications can also be made, and performance or use is identical, all answered
When being considered as belonging to protection scope of the present invention.
Claims (10)
1. a kind of device for promoting interference free performance, which is characterized in that including control centre, frequency-selective filtering amplification module, link
Gain control module, mixing amplification filter module, duplexer, RF transceiver and base band, the control centre respectively with institute
State frequency-selective filtering amplification module, link gain control module and mixing amplification filter module electrical connection:
The control centre, real time parsing base band obtain the work of the RF transceiver to the control signal of RF transceiver
Then frequency point controls the frequency-selective filtering amplification module, link gain control module and mixing amplification filter module by instruction
Running parameter so that the device for promoting interference free performance can finally restore original letter of the RF transceiver
Number；
The frequency-selective filtering amplification module, one end are electrically connected with duplexer, and link gain control module described in the other end is electrically connected
It connects, under the control instruction of the control centre, the signal of the selection reception RF transceiver working frequency points to be filtered
Wave and enhanced processing；
The link gain control module, one end are electrically connected with the frequency-selective filtering amplification module, and the other end is put with described be mixed
Big filter module electrical connection, for being adjusted in conjunction with the gain tradeoff of whole link under the control instruction of the control centre
Gain；
Filter module is amplified in the mixing, and one end is electrically connected with the link gain control module, and the other end and the radio frequency are received
Sending out device electrical connection will be under the signal Jing Guo the link gain control module under the control instruction of the control centre
It is converted to intermediate-freuqncy signal, filtering processing is amplified in intermediate frequency, then upconverts to radiofrequency signal again, be sent into the radio-frequency receiving-transmitting
Device processing.
2. the device according to claim 1 for promoting interference free performance, which is characterized in that the frequency-selective filtering amplification module
Including two reception switches and at least two signal paths, each signal path includes filter and low-noise amplifier
LNA, the reception switch is for the selection reception RF transceiver working frequency points under the instruction of control centre control
Signal, and signal path needed for selecting the working frequency points.
3. the device according to claim 1 for promoting interference free performance, which is characterized in that the link gain control module
Including at least one low-noise amplifier LNA and/or at least one attenuator.
4. the device according to claim 1 for promoting interference free performance, which is characterized in that filter module is amplified in the mixing
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 point needed for synthesizing first frequency mixer and the second frequency mixer under the instruction control in the control centre,
First frequency mixer is used for the signal for synthesizing the output signal of the link gain control module and the frequency synthesizer
It carries out being down-converted to intermediate-freuqncy signal, the intermediate-freuqncy signal is then by the amplification and filter of the intermediate frequency amplifier and intermediate-frequency filter
After wave processing, into second frequency mixer, second frequency mixer is sent into the radio frequency after carrying out upconversion process to signal
Transceiver processing.
5. the device according to claim 1 for promoting interference free performance, which is characterized in that the control centre obtains described
The detailed process of the working frequency points of RF transceiver are as follows: the base band is by coming to the RF transceiver transmission of control signals
The frequency point of the RF transceiver work is set, uses a frequency synthesizer inside the RF transceiver, the radio frequency is received
Integer part required for hair device configures its internal frequency synthesizer according to the control signal of the base band and fractional part ginseng
Number, and the two parameters are saved in both registers respectively, the control centre by obtaining described two parameters in real time
Just it is able to know that the frequency point of the RF transceiver work at present.
6. the device according to claim 2 for promoting interference free performance, which is characterized in that the frequency-selective filtering amplification module
The linear index IIP3 of the used low-noise amplifier LNA is greater than or equal to -20dbm, and the low noise amplification
The noise coefficient of device LNA is less than or equal to 3.
7. the device according to claim 3 for promoting interference free performance, which is characterized in that the link gain control module
The linear index IIP3 of the used low-noise amplifier LNA is greater than or equal to -20dbm, and the low noise amplification
The noise coefficient of device LNA is less than or equal to 3.
8. the device according to claim 4 for promoting interference free performance, which is characterized in that filter module is amplified in the mixing
Used first frequency mixer and the second mixer linearity index IIP3 are greater than or equal to -20dbm.
9. the device of -8 any promotion interference free performances according to claim 1, which is characterized in that the promotion 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 is divided into more than two channels for the signal, is individually filtered and/or enhanced processing, so as to
Overseas GSM-R frequency range and EGSM frequency range is completely separable on access, and realization exists the overseas GSM-R frequency range and EGSM frequency range
It is separated on hardware.
10. the device according to claim 1 for promoting interference free performance, which is characterized in that the frequency-selective filtering amplifies mould
Block includes two reception switches and a signal path, and the reception switch under the instruction of control centre control for selecting
The signal for receiving the RF transceiver working frequency points is selected, the signal path includes filter and low-noise amplifier LNA.
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| CN201711065583.6A CN107786213B (en) | 2017-11-02 | 2017-11-02 | A kind of device promoting interference free performance |
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| CN107786213B true CN107786213B (en) | 2019-07-30 |
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| CN111835368B (en) * | 2020-07-31 | 2022-11-18 | 海能达通信股份有限公司 | Zero intermediate frequency receiving system |
| CN113949397B (en) * | 2021-10-28 | 2022-12-27 | 安徽隼波科技有限公司 | Gain-adjustable anti-interference broadband receiver |
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| CN107786213A (en) | 2018-03-09 |
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