CN108965175A - A kind of frequency domain digital self-interference signal protects the method for useful signal in offsetting - Google Patents
A kind of frequency domain digital self-interference signal protects the method for useful signal in offsetting Download PDFInfo
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- CN108965175A CN108965175A CN201810788486.8A CN201810788486A CN108965175A CN 108965175 A CN108965175 A CN 108965175A CN 201810788486 A CN201810788486 A CN 201810788486A CN 108965175 A CN108965175 A CN 108965175A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L25/03159—Arrangements for removing intersymbol interference operating in the frequency domain
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Abstract
The invention belongs to field of communication technology, the method for useful signal is protected in specifically a kind of frequency domain digital self-interference signal counteracting.The invention mainly comprises: at the same time in co-channel full duplex system, main side transmitting antenna sends useful signal X1, and from end, receiving antenna receives useful signal X1, and synchronous X1 signal；From end after being delayed to setting time, from end, transmitting antenna sends self-interference signal X2；From end, receiving antenna receives the mixed signal being made of useful signal X1 and self-interference signal X2, obtains useful signal by frequency domain digital Interference Cancellation.Beneficial effects of the present invention are that present invention firstly provides the methods for carrying out protecting useful signal in frequency domain digital Interference Cancellation.
Description
Technical field
The invention belongs to field of communication technology, protected in specifically a kind of frequency domain digital self-interference signal counteracting useful
The method of signal.
Background technique
In existing mobile communication system, there are two types of common duplex modes, is time division duplex and frequency division duplex respectively,
Itself the characteristics of, determines that their spectrum efficiencies are low, and the identical time slot of use, similar frequency bands transmission uplink, downlink data is " same
When co-channel full duplex " technology, can be with significant increase spectrum efficiency.
There are a drawbacks for co-channel full duplex technology simultaneously: local reception antenna can receive local transmitting antenna and issue
Super high power self-interference signal.
The typical method for eliminating self-interference signal is divided into three classes: antenna interference inhibits, radio frequency interference inhibits and number
AF panel.Antenna interference inhibits to fail when proximal end self-interference signal and distal end useful signal source direction are close.
Radio frequency interference counteracting has the advantages that dynamic range is big, the disadvantage is that control is unstable, it is big etc. to offset residual.Digital interference offsets energy
Enough defects for significantly making up radio frequency interference counteracting, therefore, at the same time in co-channel full duplex technology, digital interference counteracting is
It is crucial.
Digital interference is offset, and there is control to stablize, and eliminate the strong feature of ability, and core is with certain digital signal
Processing method removes self-interference signal part in the signal received.But the self-interference signal due to receiving and useful letter
Number be aliasing together, while offsetting self-interference signal, it is most likely that irreversible damage is caused to useful signal,
Useful signal demodulation performance is influenced, causes business transmission impaired, how to solve to eliminate self-interference signal on frequency domain
Meanwhile it not destroying the useful signal received and having no document report at present.
Summary of the invention
The purpose of the present invention provides a kind of based on co-channel full duplex system frequency domain digital simultaneously aiming at the above problem
The method of effective protection useful signal in self-interference cancellation.In the document of existing communication system, present invention firstly provides
The method for carrying out protecting useful signal in frequency domain digital Interference Cancellation.
The technical scheme adopted by the invention is as follows:
A kind of frequency domain digital self-interference signal protects the method for useful signal in offsetting, and this method is for complete double with frequency simultaneously
Work system, which comprises the following steps:
S1, at the same time in co-channel full duplex system, main side transmitting antenna sends useful signal X1, and from end, receiving antenna is received
Useful signal X1, and synchronous X1 signal；
S2, since at the time of end is by being synchronized to X1 signal frame head, be delayed to after setting time, from end transmitting antenna hair
Send self-interference signal X2；
S3, from end, receiving antenna receives the mixed signal being made of useful signal X1 and self-interference signal X2, through overfrequency
Domain digital interference, which is offset, obtains useful signal
It further, is by delayer from end delay to setting time, the delayer is to pass through in the step S2
Counter counts, and setting time meets:
τ=Tframe-(Tsend+Treceive)
Wherein TframeIndicate mono- frame duration of useful signal X1, TsendIt indicates to generate needed for complete baseband signal X2 from end
Time, TreceiveIt indicates from end transmitting antenna to the decay time of eating dishes without rice or wine receiving antenna；It is closed according to τ and system work clock
System, obtains corresponding counter reference value n.
Further, in the step S3, useful signal X1 is aligned with self-interference signal X2, meets self-interference signal arrival
When, in the protection time slot of useful signal X1, when baseband frequency-domain digital interference is offset, useful signal X1 will not be destroyed.
Beneficial effects of the present invention are that present invention firstly provides protect useful signal in carry out frequency domain digital Interference Cancellation
Method.
Detailed description of the invention
Shown in fig. 1 is to realize the flow chart that useful signal is protected in frequency domain digital Interference Cancellation；
Fig. 2 shows be and meanwhile co-channel full duplex system principal and subordinate both ends receive with transmitting signal schematic representation；
Fig. 3 is shown while application schematic diagram of the present invention in co-channel full duplex system.
Specific embodiment
With reference to the accompanying drawings and examples, the technical schemes of the invention are described in detail:
In practical applications, the detailed step of the present invention are as follows:
Step 1: main side generates baseband signal by baseband digital signal processing board, through radio frequency processing, is issued and is believed by antenna
Number X1；
Step 2: from end, antenna receives main side useful signal X1, after carrying out radio frequency processing, is sent to from end base-band digital
Signal-processing board；
Step 3: from the synchronous X1 signal of end group band digital signal panel, while generating delay emission open instruction；
Step 3: from end, delay emission module receives delay emission open instruction, and entering signal delay emission state is opened
Open counter counting；
Step 4: when counter accumulated value reaches a reference value, generating a unlatching transmitting instruction, be sent to from end group
Tape handling unit；
Step 5: according to receiving to open transmitting instruction, starting to work from end signal baseband processing unit, at base band
Reason is sent to rf board, emits signal X2 through antenna；
Step 6: from end, receiving antenna receives mixed signal (self-interference signal X2 and useful signal X1), at radio frequency
Reason is sent into LTE Baseband Processing Unit and carries out frequency domain digital Interference Cancellation.
Embodiment
This example is based on co-channel full duplex system simultaneously, carries out OFDM tune using the fast algorithm IFFT and FFT of IDFT and DFT
System and demodulation add the cyclic prefix CP of 144 chip lengths as protection time slot, complete digital interference on frequency domain and offset.
The transceiver of this example forms: as shown in figure 3, transmitting terminal includes that base band sends signal processing unit and radio frequency transmission
Signal processing unit, receiving end include radio frequency receiving signal processing unit, synchronization module, frequency domain digital Interference Cancellation module, prolong
When transmitting module and baseband receiving signals processing unit.
The preferred embodiments, are realized using following steps:
Step 1 from end synchronization process
From end, receiving antenna RX receives the signal X1 from main side, by radio frequency processing, is sent into synchronization module, successfully catches
When obtaining main side signal X1, emission delay open instruction start is generated, delay sending module is sent to；
Step 2 is handled from end signal emission delay
After delay emission module receives emission delay open instruction start from end, opens counter and start accumulative total；Root
According to transmission delay τ1+τ2, X1 signal frame duration and system work clock, calculate the reference value n of counter, work as counting
When device is equal to n, generates and open transmitting instruction begin, send to base band and send signal processing unit；
Step 3 emits signal processing from end
Cong Duanji band sends signal processing unit and generates baseband signal, after QAM modulation, then does OFDM modulation, and adds 144
A cyclic prefix is sent into rf board after framing as time slot is protected, and after radio frequency processing, sends X2 signal by transmitting antenna TX.
Step 4 receives signal processing from end
Due to passing through time delay processing from end transmitting signal so that the useful signal X1 that receives of its receiving antenna RX with from dry
Disturb signal X2 alignment.When X1, X2 mixed signal through past CP processing after, handled using FFT, carry out frequency domain interference counteracting.By
It carries out CP thus according to X2 signal to handle, each OFDM symbol of X1 signal, it, all can be in protection time slot, no when removing CP
Intersymbol interference can be generated.It realizes when carrying out frequency domain digital Interference Cancellation, protects the purpose of useful signal.
Claims (3)
1. a kind of method for protecting useful signal in frequency domain digital self-interference signal counteracting, this method is for co-channel full duplex simultaneously
System, which comprises the following steps:
S1, at the same time in co-channel full duplex system, main side transmitting antenna sends useful signal X1, and from end, receiving antenna is received useful
Signal X1, and synchronous X1 signal；
S2, since at the time of end is by being synchronized to X1 signal frame head, be delayed to after setting time, from end transmitting antenna send from
Interference signal X2；
S3, from end, receiving antenna receives the mixed signal being made of useful signal X1 and self-interference signal X2, by frequency domain number
Word Interference Cancellation obtains useful signal.
2. the method for protecting useful signal in a kind of frequency domain digital self-interference signal counteracting according to claim 1, special
Sign is, is by delayer from end delay to setting time, the delayer is to pass through counter counts in the step S2
Number, setting time meet:
τ=Tframe-(Tsend+Treceive)
Wherein TframeIndicate mono- frame duration of useful signal X1, TsendIndicate that generating complete baseband signal X2 from end is taken
Between, TreceiveIt indicates from end transmitting antenna to the decay time of eating dishes without rice or wine receiving antenna；It is closed according to τ and system work clock
System, obtains corresponding counter reference value n.
3. the method for protecting useful signal in a kind of frequency domain digital self-interference signal counteracting according to claim 2, special
Sign is that in the step S3, useful signal X1 is aligned with self-interference signal X2, when meeting self-interference signal arrival, useful
In the protection time slot of signal X1, when baseband frequency-domain digital interference is offset, useful signal X1 will not be destroyed.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810788486.8A CN108965175A (en) | 2018-07-18 | 2018-07-18 | A kind of frequency domain digital self-interference signal protects the method for useful signal in offsetting |
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| CN201810788486.8A CN108965175A (en) | 2018-07-18 | 2018-07-18 | A kind of frequency domain digital self-interference signal protects the method for useful signal in offsetting |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110677365A (en) * | 2019-09-29 | 2020-01-10 | 四川安迪科技实业有限公司 | Cancellation method for carrier superposition with any bandwidth ratio, digital demodulation method and device |
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| CN103647579A (en) * | 2013-12-18 | 2014-03-19 | 中国科学院大学 | Passive elimination and digital elimination based same-frequency full duplex implementation method |
| WO2015061963A1 (en) * | 2013-10-29 | 2015-05-07 | 华为技术有限公司 | Digital interference cancellation apparatus and method for wireless full duplex system and transceiver |
| CN104779971A (en) * | 2014-11-07 | 2015-07-15 | 哈尔滨工业大学深圳研究生院 | Non-linear digital self-interference cancellation method combined with simulation cancellation algorithm |
| CN105978631A (en) * | 2016-04-18 | 2016-09-28 | 大连理工大学 | Device and method for eliminating photonic microwave self-interference signals |
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2018
- 2018-07-18 CN CN201810788486.8A patent/CN108965175A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015061963A1 (en) * | 2013-10-29 | 2015-05-07 | 华为技术有限公司 | Digital interference cancellation apparatus and method for wireless full duplex system and transceiver |
| CN103647579A (en) * | 2013-12-18 | 2014-03-19 | 中国科学院大学 | Passive elimination and digital elimination based same-frequency full duplex implementation method |
| CN104779971A (en) * | 2014-11-07 | 2015-07-15 | 哈尔滨工业大学深圳研究生院 | Non-linear digital self-interference cancellation method combined with simulation cancellation algorithm |
| CN105978631A (en) * | 2016-04-18 | 2016-09-28 | 大连理工大学 | Device and method for eliminating photonic microwave self-interference signals |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110677365A (en) * | 2019-09-29 | 2020-01-10 | 四川安迪科技实业有限公司 | Cancellation method for carrier superposition with any bandwidth ratio, digital demodulation method and device |
| CN110677365B (en) * | 2019-09-29 | 2022-01-04 | 四川安迪科技实业有限公司 | Cancellation method for carrier superposition with any bandwidth ratio, digital demodulation method and device |
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