CN105634540A - Radio frequency self-interference eliminating system applied to same-time and same-frequency full-duplex system - Google Patents
Radio frequency self-interference eliminating system applied to same-time and same-frequency full-duplex system Download PDFInfo
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- CN105634540A CN105634540A CN201610018729.0A CN201610018729A CN105634540A CN 105634540 A CN105634540 A CN 105634540A CN 201610018729 A CN201610018729 A CN 201610018729A CN 105634540 A CN105634540 A CN 105634540A
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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
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/50—Circuits using different frequencies for the two directions of communication
- H04B1/52—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa
- H04B1/525—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa with means for reducing leakage of transmitter signal into the receiver
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/14—Two-way operation using the same type of signal, i.e. duplex
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Abstract
The invention provides a radio frequency self-interference eliminating system applied to a same-time and same-frequency full-duplex system. The radio frequency self-interference eliminating system comprises a direct modulation laser device, a variable optical delay line, a variable optical attenuator, and a balanced receiver, wherein the upper branch of the direct modulation laser device is connected with the first input end of the balanced receiver, while the lower branch of the direct modulation laser device is connected with the second input end of the balanced receiver via the variable optical attenuator and the variable optical delay line in sequence; the variable optical delay line is used for matching time delays generated by a self-interference signal passing through different paths; the variable optical attenuator is used for matching the magnitude of the self-interference signal; and the balanced receiver is used for receiving two optical signals from the upper branch and lower branch of the direct modulation laser device, performing subtraction, obtaining the available optical signals and then converting into corresponding electrical signals to output. According to the system, the radio frequency signal is modulated by using the direct modulation laser device with low cost, the self-interference signal is eliminated by the balanced receiver, and the good interference eliminating performance and inhibiting performance are obtained in a relatively wide frequency band range.
Description
Technical field
The present invention relates to communication and wireless communication technology field, in particular it relates to a kind of radio frequency system being applied to co-channel full duplex system simultaneously.
Background technology
Internet of things service and big data service continuous application in mobile communication system along with novelty, the demand of wireless communication system transmission capacity is sharply increased by user, in order to adapt to the quick increased requirement of mobile Internet business, meet user's requirement to following new business, future broadband wireless communication systems needs the transmittability possessing superelevation speed, big density network accesses scale, the local operation of real time implementation and ubiquitous broadband access ability etc. In Radio Transmission Technology, in order to meet mobile communication business and the user bandwidth demand that following exponentially increases, excavate frequency spectrum resource further, improve spectrum efficiency and become outstanding problem. Promoting spectrum efficiency, i.e. exploitation higher order modulation form, this generally requires significantly high cost. The anxiety of frequency spectrum resource means that the cost increasing available bandwidth is also significantly high. For more efficiently utilizing the radio spectrum resources of growing tension, wireless full-duplex technology is proposed new demand by next generation mobile communication system. With existing FDD (Frequency-DivisionDuplex, or time division duplex (Time-DivisionDuplex FDD), TDD) system is compared, co-channel full duplex system realizes the real time bidirectional communication between user on same frequency channels simultaneously, spectrum efficiency can double in theory, thus realizing big density, high efficiency network insertion. On the other hand, existing wireless communications application mainly works in low-frequency range, and the radio band of exploitation higher frequency is a kind of effective dilatation means. When at present available frequency spectrum resource shortage, use co-channel full duplex technology simultaneously, and realize full-duplex communication at the microwave frequency band of higher frequency and will become the important selection of future broadband wireless communication systems.
Simultaneously co-channel full duplex wireless communication system FDD or tdd mode need not be separately separated uplink and downlink channel on frequency domain or time domain, it is possible to meets and operates at the same frequency at synchronization dual-mode antenna, it is achieved real time bidirectional radio communication. Due to while co-channel full duplex system transmitting antenna and reception antenna geographically close, powerful transmitting signal can be received by reception antenna, and the same UHF band reception signal of weak power is produced self-interference, i.e. co-located interference. Self-interference effect can have a strong impact on the quality receiving signal, and useful signal will be buried in self-interference signal and cannot be detected, thus govern the realization of co-channel full duplex technology simultaneously, is a big Pinch technology of full duplex communication system development. Therefore, it is achieved the matter of utmost importance of co-channel full duplex communication system eliminates with frequency self-interference exactly simultaneously. The restriction of electronic component performance it is subject to based on the system bandwidth of operation of electronics scheme, working frequency range and elimination performance. The advantage of optical technology is applied in system by optically-based self-interference technology for eliminating, the signal of telecommunication that can support higher frequency section processes in area of light, thus realize system to the extension of high band, under high-transmission bandwidth, carry out self-interference elimination. In the self-interference technology for eliminating of existing optically-based scheme, it is common to use the signal of telecommunication is modulated by the wideband modulator such as MZ Mach-Zehnder, electroabsorption modulator. The characteristic utilizing optical device deducts interference signal section from the signal received, and obtains faint useful reception signal. This process needs to replicate the transmitting signal of its own system, and it is carried out anti-phase, time delay and decay to eliminate the self-interference signal received in signal as far as possible.
Find through literature search, JohnSuarez et al. is at " IEEEJOURNALOFQUANTUMELECTRONICS (Institute of Electrical and Electric Engineers Quantum Electronics magazine) " (April, 2009) deliver the article being entitled as " IncoherentMethodofOpticalInterferenceCancellationforRadi o-FrequencyCommunications " on, propose optics self-interference cancellation scheme first. The program utilizes positive slope adjustment curve and the negative slope adjustment curve of double; two parallel MZ Mach-Zehnder, the transmitting signal of the signal received and duplication is modulated respectively with two MZ Mach-Zehnders, wherein the optical signal of negative slope adjustment curve branch road carries out decay and the time delay of necessity, enters photodetector detection after two paths of signals is coupled. This scheme obtains the self-interference signal of relative electricity scheme higher frequency band and eliminates, and the single-frequency point place being reported in 3GHz frequency range in document obtains the rejection ratio of 73dB. Due to two-way, manipulator coherence is not good, and performance is had impact by the drift of adjustment curve, and it is not very big for making self-interference eliminate bandwidth, reports the rejection ratio that can obtain 33dB in 3GHz frequency range 96MHz bandwidth in document.
Find through retrieval again, M.P.Chang, M.Fok et al. in 2013 at " IEEEMicrowaveandWirelessComponentsLetters (Institute of Electrical and Electric Engineers microwave with wireless element bulletin) " (Vol.23, No.2,2013) delivered, on, the article being entitled as " Opticalanalogself-interferencecancellationusingelectro-a bsorptionmodulators ". The program employs two electroabsorption modulators (EAM) to modulate on light carrier by the signal of telecommunication, and wherein EAM1 modulates the useful signal received and interference signal, the transmitting signal that EAM2 modulation replicates. The signal modulated couples through upper and lower two branch's optic path and in balanced reciver respectively, two paths of signals is carried out subtraction and converts optical signals to the signal of telecommunication. Wherein signal is decayed and time delay by inferior division light path, to mate and to eliminate the interference signal in top set's light path. Decay and delay are required for accurately adjusting to obtain maximized interference suppression ratio. Test the rejection ratio more than 30dB in the 25dB rejection ratio and 40MHz narrow bandwidth obtaining in 400MHz bandwidth. The program is limited to the modulation bandwidth of electroabsorption modulator, the frequency spectrum resource of higher frequency section is still had to the space of exploitation.
Summary of the invention
For defect of the prior art, it is an object of the invention to provide a kind of radio frequency system being applied to co-channel full duplex system simultaneously.
According to the radio frequency system being applied to co-channel full duplex system simultaneously provided by the invention, including: directly modulation laser instrument, tunable optical delay line, adjustable optical attenuator, balanced reciver; The upper branch road of described straight modulation laser instrument is connected to the first input end of balanced reciver, and the lower branch road of described straight modulation laser instrument passes sequentially through adjustable optical attenuator, tunable optical delay line is connected to the second input of balanced reciver; Wherein,
-described straight modulation laser instrument includes the first radio-frequency (RF) signal input end mouth, the second radio-frequency (RF) signal input end mouth, described first radio-frequency (RF) signal input end mouth for receive by while the useful signal that receives of reception antenna of co-channel full duplex system and self-interference signal; Described second radio-frequency (RF) signal input end mouth receives the transmitting signal of co-channel full duplex system transmitting antenna while duplication obtains;
-described tunable optical delay line is used for mating self-interference signal by time delay produced by different paths;
-described adjustable optical attenuator is for mating the amplitude size of self-interference signal;
-described balanced reciver is for receiving branch road, lower branch road two ways of optical signals on straight modulation laser instrument, and carries out subtraction, it is thus achieved that convert the output of the corresponding signal of telecommunication after useful optical signal to.
Preferably, also including single-mode fiber, the upper branch road of described straight modulation laser instrument is connected to the first input end of balanced reciver by single-mode fiber.
Preferably, radio frequency system is arranged in the rear class of the reception antenna of co-channel full duplex system, transmitting antenna simultaneously.
Preferably, replicate obtain while the transmitting signal of co-channel full duplex system transmitting antenna refer to: from while co-channel full duplex system transmitting antenna front end replicate the transmitting signal obtained.
Preferably, also include optical receiving device, the signal of telecommunication of described optical receiving device receiving balance receiver output, demodulate the useful radiofrequency signal after eliminating self-interference.
Compared with prior art, the present invention has following beneficial effect:
1, the radio frequency system being applied to co-channel full duplex system simultaneously provided by the invention, suitable interference suppression ratio can be obtained in the frequency range that radio communication is commonly used by the directly modulated lasers of low cost, obtain good interference suppressioning effect at super large bandwidth range.
2, the tunable optical delay line in the radio frequency system being applied to co-channel full duplex system simultaneously provided by the invention and attenuator, play the high-precision advantage of optics, regulate the amplitude of inferior division road optical signal and time delay more accurately mate the amplitude and phase place disturbing signal.
3, the broadband inhibition being applied to the simultaneously radio frequency system of co-channel full duplex system provided by the invention is good, compare the performance in document, the present invention can obtain the rejection ratio in 6GHz bandwidth more than 27dB, can obtain the rejection ratio more than 40dB and 33dB at 900MHz and 2.4GHz frequency range place respectively in 400MHz bandwidth.
Accompanying drawing explanation
By reading detailed description non-limiting example made with reference to the following drawings, the other features, objects and advantages of the present invention will become more apparent upon:
Fig. 1 is the structural representation of co-channel full duplex system while the present invention applies; In Fig. 1, Tx represents transmitting antenna, and Rx represents reception antenna;
Fig. 2 is the radio frequency system structural representation being applied to co-channel full duplex system simultaneously provided by the invention;
When Fig. 3 is in 900MHz frequency range 400MHz bandwidth, the system rejection ratio of the present invention and the relation curve schematic diagram of frequency;
When Fig. 4 is in 2.4GHz frequency range 400MHz bandwidth, the system rejection ratio of the present invention and the relation curve schematic diagram of frequency;
When Fig. 5 is in 0-6GHz bandwidth, the system rejection ratio of the present invention and the relation curve schematic diagram of frequency.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is described in detail. Following example will assist in those skilled in the art and are further appreciated by the present invention, but do not limit the present invention in any form. It should be pointed out that, to those skilled in the art, without departing from the inventive concept of the premise, it is also possible to make some deformation and improvement. These broadly fall into protection scope of the present invention.
The radio frequency system being applied to co-channel full duplex system simultaneously provided by the invention, makes interference signal obtain the rejection ratio more than 40dB and 33dB in 400MHz bandwidth range respectively at 900MHz and 2.4GHz frequency range place. Make self-interference signal can obtain in 0-6GHz bandwidth more than 27dB rejection ratio, to realize the elimination that broadband signal and high band self-interference signal is good, from high reject signal, recover faint useful signal.
According to one aspect of the invention, it is provided that the radio frequency system being applied in simultaneously co-channel full duplex wireless communication system, including directly modulated lasers, tunable optical delay line, adjustable optical attenuator, single-mode fiber and balanced reciver etc. Wherein, the useful signal that prevention at radio-frequency port 1 input of described directly modulated lasers receives and interference signal, the transmitting signal that directly modulated lasers prevention at radio-frequency port 2 input replicates.
Described adjustable optical attenuator is for mating the amplitude size of interference signal; Described tunable optical delay line is for mating the time delay that interference signal is produced by different paths; The two common purpose be make duplication launch signal and the self-interference signal amplitude received is equal, phase alignment, in order to carry out reaching best eradicating efficacy. Described balanced reciver is used for receiving two ways of optical signals and it being carried out subtraction, then converts the optical signal obtained to the signal of telecommunication, it is thus achieved that final useful signal.
Specifically, as it is shown in figure 1, in the present embodiment, it is applied to co-channel full duplex wireless communication system simultaneously according to provided by the invention, lays radio frequency system of the present invention in full-duplex wireless communication systems reception antenna rear class. The input signal of system two parts such as self-interference signal sum by launching of the replicating useful reception signal that signal and reception antenna receive with from transmitting antenna form.
As in figure 2 it is shown, in the present embodiment, described top set directly modulated lasers prevention at radio-frequency port 1 inputs signal x1T the computing formula of () is as follows:
x1(t)=s (t)+n1(t);
In formula: s (t) represents the useful signal received, n1T () represents the self-interference signal received;
Described inferior division directly modulated lasers prevention at radio-frequency port 2 inputs signal x2T the computing formula of () is as follows:
x2(t)=n2(t);
In formula: n2T () represents the transmitting signal replicated.
Described tunable optical delay line and attenuator disturb amplitude and the phase place of signal for the amplitude and phase place regulating inferior division signal to match branch, and the signal that the signal through inferior division converts through tunable optical delay line and attenuator is designated as �� x2(t-��);
Two paths of signals exports signal after described balance receiver and is designated as: y (t); And
Y (t)=x1(t)-��x2(t-��)=s (t)+n1(t)-��n2(t-��);
In formula: �� represents that attenuation quotient, �� represent delay volume, n2(t-��) represents n2(t) through time the signal delayed;
By accurately regulating tunable optical delay line and attenuator, modulate best match position and can eliminate interference signal n1T (), obtains faint useful signal s (t).
As it is shown on figure 3, in the present embodiment, with the self-interference signal ratio of Network Analyzer testing photoelectronic detector output signal and input, be inhibited than with frequency curve; The 900MHz mid frequency place, the 400MHz bandwidth inherence rejection ratio more than 40dB can be obtained.
As shown in Figure 4, in the present embodiment, with the self-interference signal ratio of Network Analyzer testing photoelectronic detector output signal and input, be inhibited than with frequency curve; The 2.4GHz mid frequency place, the 400MHz bandwidth inherence rejection ratio more than 33dB can be obtained.
As it is shown in figure 5, in the present embodiment, with the self-interference signal ratio of Network Analyzer testing photoelectronic detector output signal and input, be inhibited than with frequency curve; The rejection ratio more than 27dB in 6GHz bandwidth can be obtained.
Above specific embodiments of the invention are described. It is to be appreciated that the invention is not limited in above-mentioned particular implementation, those skilled in the art can make various deformation or amendment within the scope of the claims, and this has no effect on the flesh and blood of the present invention.
Claims (5)
1. the radio frequency system being applied to co-channel full duplex system simultaneously, it is characterised in that including: directly modulation laser instrument, tunable optical delay line, adjustable optical attenuator, balanced reciver; The upper branch road of described straight modulation laser instrument is connected to the first input end of balanced reciver, and the lower branch road of described straight modulation laser instrument passes sequentially through adjustable optical attenuator, tunable optical delay line is connected to the second input of balanced reciver; Wherein,
-described straight modulation laser instrument includes the first radio-frequency (RF) signal input end mouth, the second radio-frequency (RF) signal input end mouth, described first radio-frequency (RF) signal input end mouth for receive by while the useful signal that receives of reception antenna of co-channel full duplex system and self-interference signal; Described second radio-frequency (RF) signal input end mouth receives the transmitting signal of co-channel full duplex system transmitting antenna while duplication obtains;
-described tunable optical delay line is used for mating self-interference signal by time delay produced by different paths;
-described adjustable optical attenuator is for mating the amplitude size of self-interference signal;
-described balanced reciver is for receiving branch road, lower branch road two ways of optical signals on straight modulation laser instrument, and carries out subtraction, it is thus achieved that convert the output of the corresponding signal of telecommunication after useful optical signal to.
2. the radio frequency system being applied to co-channel full duplex system simultaneously according to claim 1, it is characterised in that also including single-mode fiber, the upper branch road of described straight modulation laser instrument is connected to the first input end of balanced reciver by single-mode fiber.
3. the radio frequency system being applied to co-channel full duplex system simultaneously according to claim 1, it is characterised in that radio frequency system is arranged in the rear class of the reception antenna of co-channel full duplex system, transmitting antenna simultaneously.
4. the radio frequency system being applied to co-channel full duplex system simultaneously according to claim 1, it is characterized in that, replicate the transmitting signal of co-channel full duplex system transmitting antenna while obtaining and refer to: from while co-channel full duplex system transmitting antenna front end replicate the transmitting signal obtained.
5. the radio frequency system being applied to co-channel full duplex system simultaneously according to claim 1, it is characterized in that, also include optical receiving device, the signal of telecommunication of described optical receiving device receiving balance receiver output, demodulate the useful radiofrequency signal after eliminating self-interference.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106357299A (en) * | 2016-08-30 | 2017-01-25 | 上海交通大学 | Radio frequency self-interference eliminating system applied to in-band full duplex system integrating MIMO (multi-input multi-output) |
| CN106788579A (en) * | 2016-12-19 | 2017-05-31 | 上海交通大学 | With interior full-duplex wireless communication systems and its Reflection Optical Thin Film system |
| CN108594479A (en) * | 2018-03-30 | 2018-09-28 | 张晗 | It is a kind of based on the full optical phase modulator of black phosphorus material and its application |
| CN110401491A (en) * | 2019-06-14 | 2019-11-01 | 中国电子科技集团公司第三十四研究所 | A kind of same location disturbance restraining method based on light processing |
| CN110703243A (en) * | 2019-09-29 | 2020-01-17 | 天津大学 | Novel silicon-based terahertz active array imaging technology based on regenerative reception principle |
| CN112468239A (en) * | 2020-10-29 | 2021-03-09 | 西安空间无线电技术研究所 | Multi-dimensional photoelectric combined simultaneous same-frequency full-duplex self-interference suppression system and method |
| CN112600587A (en) * | 2021-01-06 | 2021-04-02 | 上海交通大学 | Real-time adaptive optical self-interference elimination system and method based on FPGA and STM32 |
| CN113162693A (en) * | 2021-01-08 | 2021-07-23 | 北京工业大学 | Full-duplex communication system and method for eliminating radio frequency self-interference |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106357299A (en) * | 2016-08-30 | 2017-01-25 | 上海交通大学 | Radio frequency self-interference eliminating system applied to in-band full duplex system integrating MIMO (multi-input multi-output) |
| CN106788579A (en) * | 2016-12-19 | 2017-05-31 | 上海交通大学 | With interior full-duplex wireless communication systems and its Reflection Optical Thin Film system |
| CN106788579B (en) * | 2016-12-19 | 2020-01-07 | 上海交通大学 | In-band full-duplex wireless communication system and broadband optical self-interference elimination system thereof |
| CN108594479A (en) * | 2018-03-30 | 2018-09-28 | 张晗 | It is a kind of based on the full optical phase modulator of black phosphorus material and its application |
| CN110401491A (en) * | 2019-06-14 | 2019-11-01 | 中国电子科技集团公司第三十四研究所 | A kind of same location disturbance restraining method based on light processing |
| CN110703243A (en) * | 2019-09-29 | 2020-01-17 | 天津大学 | Novel silicon-based terahertz active array imaging technology based on regenerative reception principle |
| CN112468239A (en) * | 2020-10-29 | 2021-03-09 | 西安空间无线电技术研究所 | Multi-dimensional photoelectric combined simultaneous same-frequency full-duplex self-interference suppression system and method |
| CN112600587A (en) * | 2021-01-06 | 2021-04-02 | 上海交通大学 | Real-time adaptive optical self-interference elimination system and method based on FPGA and STM32 |
| CN113162693A (en) * | 2021-01-08 | 2021-07-23 | 北京工业大学 | Full-duplex communication system and method for eliminating radio frequency self-interference |
| CN113162693B (en) * | 2021-01-08 | 2022-10-11 | 北京工业大学 | Full-duplex communication system and method for eliminating radio frequency self-interference |
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