CN102437859A - Radio frequency front end anti-interference circuit of wireless communication receiver - Google Patents
Radio frequency front end anti-interference circuit of wireless communication receiver Download PDFInfo
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- CN102437859A CN102437859A CN2011103499573A CN201110349957A CN102437859A CN 102437859 A CN102437859 A CN 102437859A CN 2011103499573 A CN2011103499573 A CN 2011103499573A CN 201110349957 A CN201110349957 A CN 201110349957A CN 102437859 A CN102437859 A CN 102437859A
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Abstract
The invention discloses a radio frequency front end anti-interference circuit of a wireless communication receiver, which can be used for eliminating an interference signal of a receiver radio frequency front end and can also prevent a low-noise amplifier of the receiver radio frequency front end from generating saturated distortion. The radio frequency front end anti-interference circuit comprises a first mixing module, an interference eliminating module, a second mixing module and a low-noise amplifying module which are sequentially connected, wherein the first mixing module and the second mixing module both comprise frequency mixers and local oscillators. The interference eliminating module is a low-pass filter or also comprises a delay module, a high-pass filter and a combiner. The low-pass amplifying module is a low-noise amplifier. Compared with the prior art, the radio frequency front end anti-interference circuit disclosed by the invention is more excellent in the aspect of anti-interference performance, and has a wide application prospect and an important production and production practice.
Description
Technical field
The present invention relates to wireless communication field, particularly relate to a kind of anti-jamming circuit of wireless communication system receiver radio-frequency front-end.
Background technology
In wireless communication system, the input signal of receiver radio frequency front end comprises transmission signals and at least one interference signal usually.Usually the intensity of interference signal is all strong than useful signal, to such an extent as in the front-end processing process of receiver, it is saturated that interference signal might make low noise amplifier take place, thereby destroys transmission signals, causes the subsequent processes of receiver to go wrong.Therefore, be necessary very much advanced processing is carried out in the interference of receiver front end, reduce annoyance level, prevent that saturation distortion from appearring in the low noise amplifier of front end receiver.
Relation in the present existing wireless communication system receiver between radio-frequency module and other parts is as shown in Figure 1, and it has shown the structure of a typical wireless communication system receiver.Which comprises at least 104, one Digital Down Converter Module 105 of 103, one IF process modules of 102, one local oscillators of 101, one frequency mixers of a radio frequency processing module and a baseband processing module 106.Wherein, frequency mixer 102, local oscillator 103, IF process module 104, Digital Down Converter Module 105 is well-known with baseband processing module 106, and the present invention does not do change, and the present invention mainly improves the radio frequency processing module 101 of receiver front end.
Usually the input signal of the radio-frequency module of receiver comprises transmission signals and some possible interference signals, and generally in the input signal power ratio transmission signals of interference signal strong.So radio-frequency module mainly is responsible for input signal is carried out preliminary treatment to reduce the influence of interference signal to subsequent treatment.
The existing a kind of implementation of radio-frequency module is as shown in Figure 2.Before low noise amplifier, add a SAW filter and go to eliminate possible interference signal.It has explained a kind of technology that is used for eliminating the interference signal in the input signal.It is made up of 201, one low noise amplifiers of a SAWF 202.
The existing another kind of implementation of radio-frequency module is as shown in Figure 3.It is to realize second path with a notch filter, makes the input signal through it that interference signal only arranged, and deducts the output in notch filter path then with the output of low noise amplifier.This is a kind of feed-forward technique, and it is by low noise amplifier 301, radio frequency notch filter 302, and low noise amplifier 303 is formed with subtracter 304.
Radio frequency notch filter 302 is used for the filtering transmission signals and keeps interference signal, and purpose is for the signal with another path subtracts each other through subtracter 304, disturbs thereby eliminate.Yet because the unsymmetric structure of two paths, so their phase deviation is different, this elimination that has caused disturbing is limited.In addition, high-quality radio-frequency filter is difficult realization on chip, and the insertion loss is bigger, and can reduce the sensitivity of receiver.
Current, press for and develop a kind of high performance anti-interference wireless system receiver, the radio-frequency module of receiver is better suppressed, so that receiver better carries out subsequent processes to interference signal.
Summary of the invention
The objective of the invention is to overcome the above-mentioned deficiency that prior art exists, a kind of wireless communication receiver radio-frequency front-end anti-jamming circuit with interference free performance is provided, make receiver have the better resisting interference performance.
Wireless communication receiver radio-frequency front-end anti-jamming circuit provided by the invention, it is a kind of realization of radio-frequency module, can effectively eliminate the interference signal in the input signal, connecting circuit is as shown in Figure 5, comprises successively connecting:
First frequency mixing module 501, the frequency of the radiofrequency signal that is used for antenna is received is carried out conversion, is used for down-conversion, makes input signal transform to low-frequency range, and the filter of being convenient in the interference cancellation module of follow-up connection is handled its output signal.
Second frequency mixing module 503 is used for up-conversion by the signal of filtering, and former carrier frequency place is arrived in the signal transformation after the down-conversion anti-interference process.
Low noise amplification module 504 is realized the signal of eliminating after disturbing is amplified, and is convenient to other subsequent module processing to received signal in the receiver.
Described first, second frequency mixing module constitutes by frequency mixer and local oscillator, and wherein the frequency of local oscillator generation is identical with the carrier frequency of input signal.
The local oscillation signal of local oscillator output can be coupled to frequency mixer and carry out up-conversion and frequency down-converts.After the down-conversion through frequency mixer, can realize easily at the high-quality filter of low-frequency range.
The frequency of local oscillation signal is identical with carrier frequency simultaneously, guarantees transmission signals after the mixing down-conversion, to the zero-frequency position, and after interference eliminated and mixing up-conversion, the generation that can avoid mirror image to disturb.
Said interference cancellation module is a low pass filter.This filter can be realized easily, just can realize this requirement like the wet low pass filter now of common Bart.
Perhaps, said interference cancellation module is made up of a time delay module, a high pass filter and a combiner.The i.e. output of first frequency mixing module connects the input of time delay module and high pass filter simultaneously, and the output of time delay module and high pass filter is connected combiner simultaneously, and the output of combiner connects the frequency mixer in second frequency mixing module.This high pass filter can be realized easily, just can realize this requirement like the wet high pass filter now of common Bart.
Said low noise amplification module is a low noise amplifier.
Advantage of the present invention and beneficial effect:
Wireless communication receiver with interference free performance provided by the invention; Be to eliminate the interference of following transmission signals at the radio-frequency front-end of receiver; And the mirror image that has reduced the receiver radio frequency front end disturbs; With existing compared with techniques, simple in structure and be easy to realize, have broad application prospects and great production practices meaning.
Description of drawings
Fig. 1 is the schematic diagram of a typical wireless communication system receiver;
Fig. 2 is the concrete composition structural representation of a kind of implementation of existing radio frequency processing module;
Fig. 3 is the concrete composition structural representation of the another kind of implementation of existing radio frequency processing module;
Fig. 4 is the frequency translation principle schematic of Frequency mixing processing process;
Fig. 5 is the schematic diagram with wireless communication receiver RF front-end circuit of interference free performance provided by the invention;
Fig. 6 is a kind of structural representation with wireless communication receiver radio-frequency front-end embodiment of interference free performance provided by the invention;
Fig. 7 is a kind of structural representation with wireless communication receiver radio-frequency front-end embodiment of interference free performance provided by the invention.
In order to make those skilled in the art person understand the present invention program better, the present invention is done further detailed description below in conjunction with accompanying drawing and execution mode.
Embodiment
For better present invention is described, introduce the operation principle of frequency mixer processing procedure in the wireless communication system receiver earlier, as shown in Figure 4.
In wireless communication system; The process of mixing be through frequency mixer with frequency for the carrier wave that
signal and frequency are
multiplies each other, can describe through following formula.
The signal that frequency is
shown in following formula is through mixing; Become the signal of frequency, also contain the signal of image frequency simultaneously for
for
.Now assume that the input signal has a frequency of
and the frequency of the transmission signal
interference signals.Carry out mixing through the frequency mixer of a local frequency for
; Obtain frequency for
;
;
; The signal of
, as shown in Figure 4.
As described above, the problem below existing technology exists.On chip, be difficult for realizing high-quality radio-frequency filter, through producing image frequency behind the frequency mixer, the elimination that causes disturbing is very limited.Therefore, press for a kind of technology and solve above problem.
In order to solve the problem of above existence, the present invention adopts elder generation that the radio frequency receiving signal of receiver is carried out Frequency mixing processing, carries out the Filtering Processing process in low-frequency range then; Eliminate former interference signal, and the mixing mirror image interference signal that produces, then carry out mixing again; Realize up-conversion, obtain and the proportional output signal of former transmission signals, carry out the low noise amplification process at last; This moment high reject signal by filtering, thereby avoided low noise amplifier saturation distortion to occur effectively, be convenient to the subsequent treatment of receiver; It realizes that principle is as shown in Figure 5, comprises connecting successively:
First frequency mixing module 501, the frequency of the radiofrequency signal that is used for antenna is received is carried out conversion, is used for down-conversion, makes input signal transform to low-frequency range, and the filter of being convenient in the interference cancellation module of follow-up connection is handled its output signal.
Second frequency mixing module 503 is used for up-conversion by the signal of filtering, and former carrier frequency place is arrived in the signal transformation after the down-conversion anti-interference process.
Low noise amplification module 504 is realized the signal of eliminating after disturbing is amplified, and is convenient to other subsequent module processing to received signal in the receiver.
For better present invention is described, describe with concrete embodiment below in conjunction with accompanying drawing.
Embodiment 1
Fig. 6 is a kind of structural representation with wireless communication receiver radio-frequency front-end embodiment of interference free performance provided by the invention.
Referring to Fig. 6, the wireless communication receiver RF front-end circuit with interference free performance provided by the invention includes frequency mixer 601, local oscillator 602, low pass filter 603, frequency mixer 604, local oscillator 605 and low noise amplifier 606.First, second frequency mixing module constitutes by frequency mixer and local oscillator, and interference cancellation module is a low pass filter, and the signal amplification module is a low noise amplifier.
Wherein:
601 pairs of input signals of frequency mixer and local oscillated signal carry out mixing, and input signal comprises transmission signals and at least a interference signal.The Frequency mixing processing process has realized the down-conversion of transmission signals.
Filtering signal and local oscillated signal after 604 pairs of low pass filters of frequency mixer 603 are handled carry out mixing, and the signal behind the LPF only contains and the proportional composition of former transmission signals.The Frequency mixing processing process has realized the up-conversion of transmission signals.The up-conversion process that the mixing here realizes can't produce mirror image and disturb, because the signal after the low pass filter processing only contains the transmission signals of zero-frequency.
Signal after 606 pairs of frequency mixers of low noise amplifier 604 are handled amplifies, and is convenient to the subsequent treatment of receiver to signal.Because processing procedure has before been eliminated high reject signal, thereby has effectively been avoided low noise amplifier saturation distortion to occur.
Embodiment 2
Fig. 7 is the structural representation that another kind provided by the invention has the wireless communication receiver radio-frequency front-end embodiment of interference free performance.
Referring to Fig. 7; Wireless communication receiver RF front-end circuit with interference free performance provided by the invention; Include frequency mixer 701, local oscillator 702, time delay module 703, high pass filter 704, combiner 705, frequency mixer 706, local oscillator 707 and low noise amplifier 708; First, second frequency mixing module constitutes by frequency mixer and local oscillator; Interference cancellation module is made up of a time delay module, a high pass filter and a combiner, and the signal amplification module is a low noise amplifier.
Wherein:
701 pairs of input signals of frequency mixer and local oscillated signal carry out mixing, and input signal comprises transmission signals and at least a interference signal.The Frequency mixing processing process has realized the down-conversion of transmission signals.
One tunnel output signal of 703 pairs of frequency mixers 701 of time delay module carries out delay process.
Subtraction is carried out in the output of 705 pairs of time delay modules of combiner 703 and high pass filter block 704.The signal that merge after handling this moment only comprises and the proportional output signal of former transmission signals.
Signal and local oscillated signal that frequency mixer 706 is combined after device 705 is handled carry out mixing, and the signal after combiner is handled only contains and the proportional composition of former transmission signals.The Frequency mixing processing process has realized the up-conversion of transmission signals.The up-conversion process that the mixing here realizes can't produce mirror image and disturb, because the signal after the combiner processing only contains the transmission signals of zero-frequency.
Signal after 708 pairs of frequency mixers of low noise amplifier 706 are handled amplifies, and is convenient to the subsequent treatment of receiver to signal.Because processing procedure has before been eliminated high reject signal, thereby has effectively been avoided low noise amplifier saturation distortion to occur.
In sum; Compared with prior art, the present invention provides a kind of wireless communication receiver with interference free performance, and it eliminates the interference of following transmission signals at the front end of receiver; And the mirror image that has reduced receiver front end disturbs; It is simple in structure and be easy to realization, has broad application prospects, and is of great practical significance.
The above only is a preferred implementation of the present invention; Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; Can also make some improvement and retouching, these improvement and retouching also should be regarded as protection scope of the present invention.
Claims (3)
1. wireless communication receiver radio-frequency front-end anti-jamming circuit is characterized in that this circuit comprises to connect successively:
First frequency mixing module is carried out conversion to the frequency of radio frequency receiving signal, is used for down-conversion, makes input signal transform to low-frequency range, is convenient to filter and handles;
Interference cancellation module is used for the signal after the first frequency mixing module mixing is carried out anti-interference process, eliminates and disturbs, and comprises that the interference of former reception signal and the mirror image that mixing produces disturb;
Second frequency mixing module is used for up-conversion by the signal of filtering, and former carrier frequency place is arrived in the signal transformation after the down-conversion anti-interference process;
The low noise amplification module is realized the signal of eliminating after disturbing is amplified, and is convenient to other subsequent module processing to received signal in the receiver.
2. circuit according to claim 1 is characterized in that described first, second frequency mixing module constitutes by frequency mixer and local oscillator; Interference cancellation module is a low pass filter; The low noise amplification module is a low noise amplifier.
3. circuit according to claim 1 is characterized in that first, second frequency mixing module constitutes by frequency mixer and local oscillator; Interference cancellation module is made up of a time delay module, a high pass filter and a combiner; The i.e. output of first frequency mixing module connects the input of time delay module and high pass filter simultaneously; The output of time delay module and high pass filter is connected combiner simultaneously, and the output of combiner connects the frequency mixer in second frequency mixing module; The low noise amplification module is a low noise amplifier.
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| CN2011103499573A CN102437859A (en) | 2011-11-08 | 2011-11-08 | Radio frequency front end anti-interference circuit of wireless communication receiver |
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| CN2011103499573A CN102437859A (en) | 2011-11-08 | 2011-11-08 | Radio frequency front end anti-interference circuit of wireless communication receiver |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103199880A (en) * | 2013-02-28 | 2013-07-10 | 北京国泰半球科技有限公司 | Self-adaptation zero-setting antenna system |
| CN103457618A (en) * | 2012-05-30 | 2013-12-18 | 联芯科技有限公司 | Radio frequency chip front-end system and signal processing method thereof |
| CN105022917A (en) * | 2015-07-06 | 2015-11-04 | 西安理工大学 | Signal accurate extracting and processing method |
| WO2016070384A1 (en) * | 2014-11-06 | 2016-05-12 | 华为技术有限公司 | Self-interference elimination device and method |
| CN111443362A (en) * | 2018-12-29 | 2020-07-24 | 上海司南卫星导航技术股份有限公司 | Receiving device, terminal device and computer readable storage medium |
| CN111835368A (en) * | 2020-07-31 | 2020-10-27 | 海能达通信股份有限公司 | Zero intermediate frequency receiving system |
| CN112019232A (en) * | 2020-02-28 | 2020-12-01 | 加特兰微电子科技(上海)有限公司 | Signal transmitting and receiving device, electronic device and equipment |
| CN112731025A (en) * | 2020-12-22 | 2021-04-30 | 广电计量检测（成都）有限公司 | CS101 test system and method for eliminating alternating current power frequency interference |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103457618A (en) * | 2012-05-30 | 2013-12-18 | 联芯科技有限公司 | Radio frequency chip front-end system and signal processing method thereof |
| CN103457618B (en) * | 2012-05-30 | 2015-08-12 | 联芯科技有限公司 | Radio frequency chip front-end system and signal processing method thereof |
| CN103199880A (en) * | 2013-02-28 | 2013-07-10 | 北京国泰半球科技有限公司 | Self-adaptation zero-setting antenna system |
| WO2016070384A1 (en) * | 2014-11-06 | 2016-05-12 | 华为技术有限公司 | Self-interference elimination device and method |
| CN105022917A (en) * | 2015-07-06 | 2015-11-04 | 西安理工大学 | Signal accurate extracting and processing method |
| CN105022917B (en) * | 2015-07-06 | 2018-02-16 | 西安理工大学 | A kind of signal accurately extracts and processing method |
| CN111443362A (en) * | 2018-12-29 | 2020-07-24 | 上海司南卫星导航技术股份有限公司 | Receiving device, terminal device and computer readable storage medium |
| CN111443362B (en) * | 2018-12-29 | 2022-04-01 | 上海司南卫星导航技术股份有限公司 | Receiving device, terminal device and computer readable storage medium |
| CN112019232A (en) * | 2020-02-28 | 2020-12-01 | 加特兰微电子科技(上海)有限公司 | Signal transmitting and receiving device, electronic device and equipment |
| CN112019232B (en) * | 2020-02-28 | 2023-01-31 | 加特兰微电子科技(上海)有限公司 | Signal transmitting and receiving device, electronic device and equipment |
| CN111835368A (en) * | 2020-07-31 | 2020-10-27 | 海能达通信股份有限公司 | Zero intermediate frequency receiving system |
| CN111835368B (en) * | 2020-07-31 | 2022-11-18 | 海能达通信股份有限公司 | Zero intermediate frequency receiving system |
| CN112731025A (en) * | 2020-12-22 | 2021-04-30 | 广电计量检测（成都）有限公司 | CS101 test system and method for eliminating alternating current power frequency interference |
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Application publication date: 20120502 |