WO2019001691A1 - Utilisation de bande de garde - Google Patents

Utilisation de bande de garde Download PDF

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Publication number
WO2019001691A1
WO2019001691A1 PCT/EP2017/065903 EP2017065903W WO2019001691A1 WO 2019001691 A1 WO2019001691 A1 WO 2019001691A1 EP 2017065903 W EP2017065903 W EP 2017065903W WO 2019001691 A1 WO2019001691 A1 WO 2019001691A1
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WO
WIPO (PCT)
Prior art keywords
signal
computer program
transmission reference
crosstalk cancellation
reference signal
Prior art date
Application number
PCT/EP2017/065903
Other languages
English (en)
Inventor
Jan Hellmann
Marko FLEISCHER
Original Assignee
Nokia Solutions And Networks Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nokia Solutions And Networks Oy filed Critical Nokia Solutions And Networks Oy
Priority to PCT/EP2017/065903 priority Critical patent/WO2019001691A1/fr
Publication of WO2019001691A1 publication Critical patent/WO2019001691A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/32—Reducing cross-talk, e.g. by compensating
    • 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
    • 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
    • H04L5/1461—Suppression of signals in the return path, i.e. bidirectional control circuits

Definitions

  • the present invention relates to guard band utilization. More specifically, the present invention exemplarily relates to measures (including methods, apparatuses and computer program products) for realizing guard band utilization.
  • the present specification generally relates to the usage of guard bands between uplink (UL) and downlink (DL) bands for the service of frequency division duplex (FDD) access nodes such as base transceiver stations (BTS).
  • FDD frequency division duplex
  • a guard band is an unused part of the radio spectrum between radio bands for the purpose of preventing interference, i.e. mutual influence of the involved radio bands.
  • the guard band is a narrow frequency range used to separate two wider frequency ranges to ensure that both can propagate simultaneously without interfering with each other.
  • the guard band may be used in both wired or wireless communications, so that adjacent frequency bands on the same media can avoid interference.
  • guard band is established for a paired frequency band which is a pair of frequency bands, namely of an UL band and a DL band.
  • guard band specifications take into consideration that a certain gap between UL and DL bands must be established to allow state-of-the-art duplex filters to sufficiently suppress transmitter (TX) spurious emissions and to guarantee high receive sensitivity.
  • TX transmitter
  • guard band size definition within 3 rd Generation Partnership Project (3GPP) was a compromise for FDD to keep performance and costs balanced and scarifying frequencies unusable for service.
  • Duplex filters are part of radio modules and are responsible to connect supported UL bands and DL bands (i.e. receiver (RX) and transmitter (TX)) to a common antenna.
  • the frequency resources of a guard band are unused for the corresponding FDD (paired) frequency band and in particular communications/services handled utilizing the corresponding FDD (paired) frequency band.
  • FDD frequency division duplex
  • the frequency resources of a guard band are unused for the corresponding FDD (paired) frequency band and in particular communications/services handled utilizing the corresponding FDD (paired) frequency band.
  • Figure 4 is a schematic diagram illustrating frequency responses of an exemplary duplex filter.
  • Figure 4 illustrates an example of duplex filter key performance parameters in a Band 3 context, where the provided guard band is indicated by chain dotted lines, and a potential guard band reduction is suggested by arrows starting from the chain dotted lines.
  • the exemplary duplex filter is schematically illustrated as comprising a TX (band pass) filter connected to a TX via terminal 1 and an RX (band pass) filter connected to an RX via terminal 3, via terminal 2, wherein the TX (band pass) filter and the RX (band pass) filter are respectively connected to an antenna via terminal 2.
  • the graph s21 corresponds to the (TX) insertion loss between terminal 1 and terminal 2.
  • the graph s32 corresponds to the (RX) insertion loss between terminal 2 and terminal 3.
  • the graph s31 corresponds to the (TXRX) isolation between terminal 1 and terminal 3. Utilizing an additional frequency spectrum laying inside the guard band would, however, require a more stringent performance of the duplex filters associated with additional resonators.
  • a method comprising transmitting a first signal, receiving a second signal, wherein said second signal is influenced by said first signal, generating a crosstalk cancellation signal based on a transmission reference signal, wherein said transmission reference signal is indicative of said first signal, and correcting said second signal based on said crosstalk cancellation signal.
  • an apparatus comprising at least one processor, at least one memory including computer program code, and at least one interface configured for communication with at least another apparatus, the at least one processor, with the at least one memory and the computer program code, being configured to cause the apparatus to perform transmitting a first signal, receiving a second signal, wherein said second signal is influenced by said first signal, generating a crosstalk cancellation signal based on a transmission reference signal, wherein said transmission reference signal is indicative of said first signal, and correcting said second signal based on said crosstalk cancellation signal.
  • an apparatus comprising transmitting circuitry configured to transmit a first signal, receiving circuitry configured to receive a second signal, wherein said second signal is influenced by said first signal, generating circuitry configured to generate a crosstalk cancellation signal based on a transmission reference signal, wherein said transmission reference signal is indicative of said first signal, and correcting circuitry configured to corrected said second signal based on said crosstalk cancellation signal.
  • a computer program product comprising computer-executable computer program code which, when the program is run on a computer (e.g. a computer of an apparatus according to any one of the aforementioned apparatus-related exemplary aspects of the present invention), is configured to cause the computer to carry out the method according to any one of the aforementioned method-related exemplary aspects of the present invention.
  • guard band utilization More specifically, by way of exemplary embodiments of the present invention, there are provided measures and mechanisms for realizing guard band utilization.
  • measures for making spectrum in FDD systems which is currently part of the guard band available for data traffic are provided.
  • additional frequency spectrum is available while todays filter requirements can be maintained.
  • Figure 1 is a block diagram illustrating an apparatus according to exemplary embodiments of the present invention
  • FIG. 2 is a block diagram illustrating an apparatus according to exemplary embodiments of the present invention
  • Figure 3 is a schematic diagram of a procedure according to exemplary embodiments of the present invention
  • Figure 4 is a schematic diagram illustrating frequency responses of an exemplary duplex filter
  • Figure 5 is a schematic diagram illustrating signal levels at an antenna port of an exemplary macro base station with reduced guard band
  • Figure 6 is a schematic diagram illustrating guard band utilization and TXRX crosstalk cancellation according to exemplary embodiments of the present invention
  • Figure 7 is a block diagram schematically illustrating reference signal extraction according to exemplary embodiments of the present invention
  • Figure 8 is a block diagram schematically illustrating reference signal extraction and cancellation signal generation according to exemplary embodiments of the present invention
  • Figure 9 is a block diagram schematically illustrating reference signal extraction and cancellation signal generation according to exemplary embodiments of the present invention.
  • Figure 10 is a schematic diagram of an example of a frequency spectrum of an RX band according to exemplary embodiments of the present invention generally illustrating crosstalk cancellation effects
  • Figure 11 is a schematic diagram of an example of a frequency spectrum of an RX band according to exemplary embodiments of the present invention particularly illustrating crosstalk cancellation effects within the guard band
  • Figure 12 is a block diagram alternatively illustrating an apparatus according to exemplary embodiments of the present invention.
  • the following description of the present invention and its embodiments mainly refers to specifications being used as non-limiting examples for certain exemplary network configurations and deployments. Namely, the present invention and its embodiments are mainly described in relation to 3GPP specifications being used as non-limiting examples for certain exemplary network configurations and deployments. As such, the description of exemplary embodiments given herein specifically refers to terminology which is directly related thereto. Such terminology is only used in the context of the presented non-limiting examples, and does naturally not limit the invention in any way. Rather, any other communication or communication related system deployment, etc. may also be utilized as long as compliant with the features described herein.
  • guard band utilization requires to shift RX and TX band edges in a way that the guard band is narrowed. This would result in a violation of the required TX to RX isolation, as discussed above, which would negatively impact RX sensitivity.
  • crosstalk cancellation is used to compensate for the lacking duplex filter suppression.
  • Figure 6 illustrates guard band utilization and TXRX crosstalk cancellation to ensure TXRX isolation according to exemplary embodiments of the present invention.
  • exemplary embodiments of the present invention allow the reduction of the guard band without changing duplex filter performance requirements and thus to keep costs, weight and size.
  • FIG. 5 is a schematic diagram illustrating signal levels at an antenna port of an exemplary macro base station with reduced guard band.
  • the extended RX band allocates parts of the former guard band.
  • an intermodulation product from the own TX hits the RX band in this area ("IM3 level RX band" line in Figure 5). This would reflect worst case requirements on a duplex filter used in such scenario. While keeping the same duplex filter performance, it is not possible to deal with this narrowed guard band and to suppress any intermodulation (crosstalk) sufficiently.
  • TX to RX crosstalk cancellation is used to close the gap to the required sensitivity limit. Exemplary embodiments of the present invention are explained below in general terms with reference to Figures 1 to 3.
  • FIG 1 is a block diagram illustrating an apparatus according to exemplary embodiments of the present invention.
  • the apparatus may be a network node 10 such as a base transceiver station comprising transmitting circuitry 11, receiving circuitry 12, generating circuitry 13, and correcting circuitry 14.
  • the transmitting circuitry 11 transmits a first signal.
  • the receiving circuitry 12 receives a second signal, wherein said second signal is influenced by said first signal.
  • the generating circuitry 13 generates a crosstalk cancellation signal based on a transmission reference signal, wherein said transmission reference signal is indicative of said first signal.
  • the correcting circuitry 14 corrects said second signal based on said crosstalk cancellation signal.
  • Figure 3 is a schematic diagram of a procedure according to exemplary embodiments of the present invention.
  • a procedure according to exemplary embodiments of the present invention comprises an operation of transmitting (S31) a first signal, an operation of receiving (S32) a second signal, wherein said second signal is influenced by said first signal, an operation of generating (S33) a crosstalk cancellation signal based on a transmission reference signal, wherein said transmission reference signal is indicative of said first signal, and an operation of correcting (S34) said second signal based on said crosstalk cancellation signal.
  • Figure 2 is a block diagram illustrating an apparatus according to exemplary embodiments of the present invention.
  • Figure 2 illustrates a variation of the apparatus shown in Figure 1.
  • the apparatus according to Figure 2 may thus further comprise creating circuitry 21, modelling circuitry 22, modifying circuitry 23, converting circuitry 24, filtering circuitry 25, determining circuitry 26, and/or adding circuitry 27.
  • At least some of the functionalities of the apparatus shown in Figure 1 may be shared between two physically separate devices forming one operational entity. Therefore, the apparatus may be seen to depict the operational entity comprising one or more physically separate devices for executing at least some of the described processes.
  • the second signal is influenced by said first signal.
  • the influence of the first signal on the second signal is embodied by an interference between said second signal and said first signal.
  • crosstalking means any phenomenon by which a signal transmitted on one circuit or channel of a transmission system creates an (undesired) effect in another circuit or channel.
  • Crosstalk is usually caused by undesired capacitive, inductive, or conductive coupling from one circuit, part of a circuit, or channel, to another.
  • the crosstalk appears between terminal 1 and terminal 3, such that the first signal (i.e. the signal (to be) transmitted via the duplex filter and an antenna) creates an effect on the second signal (i.e. the signal received via the antenna and the duplex filter).
  • the coupling may take place in the duplex filter and/or the elements/circuits connected to terminals 1 and 3, respectively, and influencing each other.
  • an exemplary method according to exemplary embodiments of the present invention may comprise an operation of creating said first signal as an analogue signal based on a transmission digital baseband signal.
  • the transmission reference signal is said transmission digital baseband signal.
  • Such exemplary generating operation (S33) may comprise an operation of modelling crosstalk influence of said first signal on said second signal, and an operation of modifying said transmission reference signal based on a result of said modelling.
  • an exemplary method according to exemplary embodiments of the present invention may comprise an operation of creating said first signal as an analogue signal based on a transmission digital baseband signal.
  • the transmission reference signal is said first signal.
  • Such exemplary generating operation (S33) may comprise an operation of converting said transmission reference signal utilizing a radio frequency receiver.
  • the said creating said first signal is effected utilizing an amplifier.
  • Such exemplary generating operation (S33) may comprise an operation of filtering said transmission reference signal.
  • the modified transmission reference signal or the converted transmission reference signal (dependent on the implemented option) is filtered according to this variation.
  • the filtering is effected utilizing a finite impulse response filter based on filter coefficients for said finite impulse response filter.
  • an exemplary method according to exemplary embodiments of the present invention may comprise an operation of determining said filter coefficients based on said transmission reference signal and said second signal.
  • exemplary details of the correcting operation (S34) are given, which are inherently independent from each other as such.
  • Such exemplary correcting operation (S34) may comprise an operation of adding said crosstalk cancellation signal to said second signal.
  • the above measures allow to utilize (parts of) the guard band for transmissions while nevertheless the requirements on the duplex filter are not toughened, since the disadvantages adjoined with narrowing the guard band (i.e. decreased TX to RX isolation which leads to violation of RX sensitivity limits) are compensated by the advantages of the measures according to exemplary embodiments of the present invention enabling crosstalk compensation.
  • the implementation of exemplary embodiments of the present invention exploits TX to RX crosstalk cancellation in digital domain, which targets on generating a cancellation signal suited to be added to the digital RX signal for cancellation purpose.
  • the necessity to cancel the crosstalk is caused by the guard band reduction and the circumstance that the TX to RX suppression (s31) is not sufficient in such case.
  • the cancellation signal (cane) is derived from a reference signal (ref).
  • a reference signal ref
  • Figure 7 in particular illustrates TX to RX crosstalk cancellation and positions of cancellation and reference signals according to exemplary embodiments of the present invention.
  • the reference signal (ref) has two purposes. Namely, on the one hand, the reference signal (ref) serves as input to estimate a filter (FIR) with coefficients h cr0 ss. Further, on the other hand, the estimated filter is used to provide the cancellation signal (cane) from/based on the reference signal (ref). When combining/superimposing the cancellation signal and the main signal (main), a cleaned main signal (clean) is achieved.
  • FIR filter
  • the estimated filter is used to provide the cancellation signal (cane) from/based on the reference signal (ref).
  • Figure 8 is a block diagram schematically illustrating reference signal extraction and cancellation signal generation according to exemplary embodiments of the present invention and in particular a TX to RX crosstalk cancellation based on an analogue reference signal (ref). Hence, Figure 8 corresponds to option 1 shown in Figure 7.
  • Figure 8 in particular shows how the reference signal (ref) is derived from the analogue TX signal (after a transmitter incl. digital pre-distortion (DPD) and a power amplifier (PA)) and fed, via an RX filter, to an extra cancellation receiver.
  • DPD digital pre-distortion
  • PA power amplifier
  • FIG. 9 is a block diagram schematically illustrating reference signal extraction and cancellation signal generation according to exemplary embodiments of the present invention and in particular a TX to RX crosstalk cancellation based on a digital reference signal (ref). Hence, Figure 9 corresponds to option 2 shown in Figure 7.
  • Figure 9 in particular shows how the reference signal (ref) is derived from the digital baseband signal which is then subjected to a chain of modelling the TX to RX crosstalk (inter-modulation (IM) modelling).
  • IM inter-modulation
  • the finite impulse response (FIR) filter shown in Figures 8 and 9 is effective to determine, based on the reference signal (in particular based on a signal (ref) derived from the reference signal (ref) as explained above by means of an RX filter and a cancellation receiver (option 1) or by means of IM modelling (option 2)), the cancellation signal (cane) to be superimposed with the main signal provided by the main receiver.
  • the Fl R filter is provided with filter coefficients h cr oss.
  • the filter coefficients h cr0 ss may be calculated during an identification phase. This calculation may be effected by software. This would require that reference and main signals as shown in Figures 7 to 9 are accessible (in terms of captured signals) by the entity effecting the calculation, e.g. the calculation software.
  • the filter coefficients h CT oss are periodically updated to ensure sufficient cancellation results over changing conditions such as temperature.
  • the Rx band is filtered, and the reference signal (ref) and the main signal (main) are time aligned.
  • An auto- correlation matrix R xx and a coss- correlation vector r xy are used as an input to calculate complex filter coefficients h cross — Rxx ⁇ 1 rxy.
  • a cancellation signal (cane) is generated by filtering the aligned/derived reference signal (ref) with h cr oss.
  • crosstalk cancellation also enables that the duplex filter are relaxed, thereby achieving e.g. smaller, lighter (less bulky) filters with new materials.
  • Figures 10 and 11 are schematic diagrams illustrating examples of frequency spectra of an RX band according to exemplary embodiments of the present invention.
  • Figures 10 and 11 show some results measured with real existing hardware with a setup based on the cancellation receiver architecture as outlined above.
  • Figure 10 illustrates crosstalk cancellation effects in general
  • Figure 11 illustrates in particular crosstalk cancellation effects within the guard band.
  • the TX to RX crosstalk considered for the examples shown in Figures 10 and 11 was generated as intermodulation product 3rd order (IM3) out of two LTE5 carriers in a way that the IM3 hits the RX channel under investigation.
  • Figure 10 shows a reconstruction of a user signal by TXRX crosstalk cancellation.
  • Figure 10 shows that an LTE5 user signal can be reconstructed from the received RX (main) by the above explained measures even if it is completely covered by crosstalk.
  • the dotted line represents the main signal (main) including a received LTE5 user signal and the TXRX crosstalk.
  • the solid line represents the cleaned main signal (clean) which corresponds to the received user signal without substantial distortion.
  • the bar shaped peak which protrudes from the plateau in the middle of the spectrum corresponds to the active LTE5 user signal, while the more or less flat plateau corresponds to the noise reference as also indicated by the dashed line.
  • the dotted line (i.e. the main signal) also covers the bar shaped peak representing the active LTE5 user signal, i.e., also includes the active LTE5 user signal.
  • Figure 10 shows the general ability to remove crosstalk from an "uncleaned" main signal such that the cleaned signal is nearby the noise reference level for frequencies without the active LTE5 user signal and corresponds to the active LTE5 user signal for frequencies of the active LTE5 user signal.
  • Figure 11 shows an RX noise floor increase.
  • Figure 11 shows that cancellation close to noise floor is possible. This is also valid for duplex filter TX to RX isolations as they can be typically found within the guard band, in particular if notches are included.
  • the dotted line in Figure 11 represents the main signal (main) including the TXRX crosstalk but without the received LTE5 user signal.
  • the active user signal is omitted in order to emphasize the behavior and capability of the crosstalk cancellation according to exemplary embodiments in particular in relation to band gaps.
  • a notch (drop) in the main signal including the TXRX crosstalk is/ are a result of utilizing the band gap with filters not having the needed filter steepness.
  • Figure 11 shows the ability to remove crosstalk from an "uncleaned” main signal even if, as in the present case, one or more notches are contained in the "uncleaned” main signal. Accordingly, the cleaned signal is nearby the noise reference level (as shown), and would also correspond to the active LTE5 user signal for frequencies of the active LTE5 user signal (not shown in order not to cover the notches).
  • Band 3 is used as an example which is non-limiting and the present invention can also be applied to other specified Bands and to band gaps lying on arbitrary (center) frequencies.
  • the guard band can be narrowed by 5 to 10 MHz without the necessity to modify the filter requirements, which amounts to 25 to 50 % of the "original" guard band of 20 MHz.
  • One option to overcome this lack of accordance in features would be to only provide the features of the less equipped network entity, i.e., all participants of a network (section) use frequency resources of the guard band or do not.
  • Another option to overcome this lack of accordance in features would be to only provide the features of the less equipped network entity of a specific connection, i.e., all participants of specific connection use frequency resources of the guard band or do not for that connection.
  • the present invention is not limited to the examples given above.
  • the network entity may comprise further units that are necessary for its respective operation. However, a description of these units is omitted in this specification.
  • the arrangement of the functional blocks of the devices is not construed to limit the invention, and the functions may be performed by one block or further split into sub-blocks.
  • processor or corresponding circuitry potentially in cooperation with computer program code stored in the memory of the respective apparatus, is configured to cause the apparatus to perform at least the thus mentioned function.
  • function is to be construed to be equivalently implementable by specifically configured circuitry or means for performing the respective function (i.e. the expression "unit configured to” is construed to be equivalent to an expression such as "means for").
  • the apparatus (network node) 10' (corresponding to the network node 10) comprises a processor 121, a memory 122 and an interface 123, which are connected by a bus 124 or the like.
  • the apparatus may be connected to other apparatuses (e.g. device 120, i.e., an interface of device 120) via link 125, respectively.
  • the processor 121 and/or the interface 123 may also include a modem or the like to facilitate communication over a (hardwire or wireless) link, respectively.
  • the interface 123 may include a suitable transceiver coupled to one or more antennas or communication means for (hardwire or wireless) communications with the linked or connected device(s), respectively.
  • the interface 123 is generally configured to communicate with at least one other apparatus, i.e. the interface thereof.
  • the memory 122 may store respective programs assumed to include program instructions or computer program code that, when executed by the respective processor, enables the respective electronic device or apparatus to operate in accordance with the exemplary embodiments of the present invention.
  • the respective devices/ apparatuses may represent means for performing respective operations and/or exhibiting respective functionalities, and/or the respective devices (and/or parts thereof) may have functions for performing respective operations and/or exhibiting respective functionalities.
  • the processor or some other means
  • the processor is configured to perform some function
  • this is to be construed to be equivalent to a description stating that at least one processor, potentially in cooperation with computer program code stored in the memory of the respective apparatus, is configured to cause the apparatus to perform at least the thus mentioned function.
  • function is to be construed to be equivalently implementable by specifically configured means for performing the respective function (i.e.
  • an apparatus representing the network node 10 comprises at least one processor 121, at least one memory 122 including computer program code, and at least one interface 123 configured for communication with at least another apparatus.
  • the processor i.e.
  • the at least one processor 121 with the at least one memory 122 and the computer program code) is configured to perform transmitting a first signal (thus the apparatus comprising corresponding means for transmitting), to perform receiving a second signal, wherein said second signal is influenced by said first signal (thus the apparatus comprising corresponding means for receiving), to perform generating a crosstalk cancellation signal based on a transmission reference signal, wherein said transmission reference signal is indicative of said first signal (thus the apparatus comprising corresponding means for generating), and to perform correcting said second signal based on said crosstalk cancellation signal (thus the apparatus comprising corresponding means for correcting).
  • any method step is suitable to be implemented as software or by hardware without changing the idea of the embodiments and its modification in terms of the functionality implemented;
  • CMOS Complementary MOS
  • BiMOS Bipolar MOS
  • BiCMOS Bipolar CMOS
  • ECL emitter Coupled Logic
  • TTL Transistor- Transistor Logic
  • ASIC Application Specific IC
  • FPGA Field-programmable Gate Arrays
  • CPLD Complex Programmable Logic Device
  • DSP Digital Signal Processor
  • - devices, units or means e.g. the above-defined network entity or network register, or any one of their respective units/means
  • an apparatus like the user equipment and the network entity /network register may be represented by a semiconductor chip, a chipset, or a (hardware) module comprising such chip or chipset; this, however, does not exclude the possibility that a functionality of an apparatus or module, instead of being hardware implemented, be implemented as software in a (software) module such as a computer program or a computer program product comprising executable software code portions for execution/being run on a processor;
  • a device may be regarded as an apparatus or as an assembly of more than one apparatus, whether functionally in cooperation with each other or functionally independently of each other but in a same device housing, for example.
  • respective functional blocks or elements according to above-described aspects can be implemented by any known means, either in hardware and/or software, respectively, if it is only adapted to perform the described functions of the respective parts.
  • the mentioned method steps can be realized in individual functional blocks or by individual devices, or one or more of the method steps can be realized in a single functional block or by a single device.
  • any method step is suitable to be implemented as software or by hardware without changing the idea of the present invention.
  • Devices and means can be implemented as individual devices, but this does not exclude that they are implemented in a distributed fashion throughout the system, as long as the functionality of the device is preserved. Such and similar principles are to be considered as known to a skilled person.
  • Software in the sense of the present description comprises software code as such comprising code means or portions or a computer program or a computer program product for performing the respective functions, as well as software (or a computer program or a computer program product) embodied on a tangible medium such as a computer-readable (storage) medium having stored thereon a respective data structure or code means/portions or embodied in a signal or in a chip, potentially during processing thereof.
  • the present invention also covers any conceivable combination of method steps and operations described above, and any conceivable combination of nodes, apparatuses, modules or elements described above, as long as the above-described concepts of methodology and structural arrangement are applicable.
  • Such measures exemplarily comprise transmitting a first signal, receiving a second signal, wherein said second signal is influenced by said first signal, generating a crosstalk cancellation signal based on a transmission reference signal, wherein said transmission reference signal is indicative of said first signal, and correcting said second signal based on said crosstalk cancellation signal.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

L'invention concerne des mesures d'utilisation de bande de garde. De telles mesures consistent à titre d'exemple à émettre un premier signal, à recevoir un second signal, ledit second signal étant influencé par ledit premier signal, à générer un signal d'annulation de diaphonie sur la base d'un signal de référence d'émission, ledit signal de référence d'émission étant indicatif dudit premier signal, et à corriger ledit second signal sur la base dudit signal d'annulation de diaphonie.
PCT/EP2017/065903 2017-06-27 2017-06-27 Utilisation de bande de garde WO2019001691A1 (fr)

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Application Number Priority Date Filing Date Title
PCT/EP2017/065903 WO2019001691A1 (fr) 2017-06-27 2017-06-27 Utilisation de bande de garde

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100823569B1 (ko) * 2005-12-10 2008-04-21 한국전자통신연구원 주파수 대역의 부분적인 중첩에 따른 간섭 신호를 제거하는장치 및 그 방법
WO2015043673A1 (fr) * 2013-09-30 2015-04-02 Nokia Solutions And Networks Oy Mécanisme d'amélioration de sensitivité d'un récepteur
WO2016010464A1 (fr) * 2014-07-14 2016-01-21 Telefonaktiebolaget L M Ericsson (Publ) Suppression de diaphonie

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100823569B1 (ko) * 2005-12-10 2008-04-21 한국전자통신연구원 주파수 대역의 부분적인 중첩에 따른 간섭 신호를 제거하는장치 및 그 방법
WO2015043673A1 (fr) * 2013-09-30 2015-04-02 Nokia Solutions And Networks Oy Mécanisme d'amélioration de sensitivité d'un récepteur
WO2016010464A1 (fr) * 2014-07-14 2016-01-21 Telefonaktiebolaget L M Ericsson (Publ) Suppression de diaphonie

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