EP3794752A1 - Récepteur et procédé de réduction de l'influence de parasites à bande étroite pendant une réception de signal ofdm - Google Patents

Récepteur et procédé de réduction de l'influence de parasites à bande étroite pendant une réception de signal ofdm

Info

Publication number
EP3794752A1
EP3794752A1 EP19709943.5A EP19709943A EP3794752A1 EP 3794752 A1 EP3794752 A1 EP 3794752A1 EP 19709943 A EP19709943 A EP 19709943A EP 3794752 A1 EP3794752 A1 EP 3794752A1
Authority
EP
European Patent Office
Prior art keywords
signal
dab
ofdm receiver
llr
expected
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
EP19709943.5A
Other languages
German (de)
English (en)
Inventor
Martin Speitel
Thomas Langer
Thomas Dettbarn
Christian Fiermann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
Original Assignee
Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
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 Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV filed Critical Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
Publication of EP3794752A1 publication Critical patent/EP3794752A1/fr
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
    • H04J11/0023—Interference mitigation or co-ordination
    • H04J11/0066—Interference mitigation or co-ordination of narrowband interference
    • 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
    • H04L25/06—Dc level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection
    • H04L25/067—Dc level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection providing soft decisions, i.e. decisions together with an estimate of reliability
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/38—Demodulator circuits; Receiver circuits
    • H04L27/3809—Amplitude regulation arrangements

Definitions

  • Embodiments of the present invention refer to a receiver, e.g. a DAB (Digital Audio Broadcasting) or in general DAB / OFDM receiver and a method for receiving an OFDM signal (Orthogonal Frequency-Division Multiplexing). Further embodiments refer to a cor responding computer program.
  • a receiver e.g. a DAB (Digital Audio Broadcasting) or in general DAB / OFDM receiver and a method for receiving an OFDM signal (Orthogonal Frequency-Division Multiplexing).
  • OFDM Orthogonal Frequency-Division Multiplexing
  • Narrowband spurs are a problem for all kind of radio receivers. This becomes more and more relevant for digital radio receivers especially in a car environment.
  • An OFDM system like DAB, DRM (Digital Radio Mondiale) and others are in principle designed for robust- ness against narrowband impairments. This could be narrowband noise or notches due to5 multipath effects.
  • Spurs are an inherent problem of any signal processing system. In analog systems, such as telephones or loudspeakers, they manifest in an audible hum or persistent high-pitch tone. In digital systems, such as digital radios, cell phones or WIFI, they produce an error0 floor of false bits. These can be filtered out through toward error correction (FEC), however, they impair performance.
  • FEC error correction
  • spurs can be compensated via careful pre-calibration and ex pensive shielding.
  • the two patent applications US 2008/101212 A and KR5 20100058931 A both describing the problem of spurs in context of OFDM systems, should be mentioned.
  • LLR value Log Likelihood Ratio
  • an in-band narrowband interfere ⁇ also referred to as“spur”, with a high power on one frequency (carrier) produces a high reliability for the corre- sponding LLR value, even though the carrier is disturbed significantly by the noise power from the spur.
  • the forward error correction5 (FEC) misinterprets this high LLR reliability as a high reliability for a correctly received and remapped bit. In case of a Viterbi decoder, this might mislead the error compensation of the following bits as well. Therefore, there is a need for an improved approach.
  • An embodiment provides the receiver comprising a receiving path and a spur detector.
  • the receiving part is configured to receive a signal comprising an expected signal portion and a payload portion.
  • the expected signal portion may, for example, be a null symbol (time frame in which no signal power is broadcasted) typically included for synchronization purposes.
  • the spur detector which may, for example, be arranged parallel to the receiving path or as bypass of the receiving path, is configured to analyze the expected signal por tion in order to detect an interference, e.g. an in-band narrowband spur overlapping the signal.
  • the knowledge about the detected spurs can be used to increase the receiver per formance (by reducing the influence of (narrowband) spurs in an OFDM system).
  • the interference may be an in-band spur lying within the band of the signal and/or having a bandwidth which is significantly smaller, e.g. minimum 4/256 to 4/2048 smaller per one single spur than the band of the signal (payload signal).
  • the signal is, for example, a signal on the time domain, where the expected sig- nal portion is a certain time frame of the time signal.
  • the position of the expected signal portion with respect to the payload signal within the signal is fixed.
  • the expected signal portion may be the typically broadcasted null symbol having synchroniza- tion purposes. This signal portion is preferred, since its energy level should amount to 0.
  • Embodiments of the present invention are based on the principle that certain systems, such as DAB, use an expected signal portion, for example null symbols for synchroniza- tion purposes. Those are extended stretches of time, where no power is being transmit ted. The position within the waveform is fixed, thus, any power detected during that period must be stemming from spurs. Based on this knowledge, a receiver can be designed hav- ing a spur detection which analyzes this expected signal portion, or, in general signal por- tion having a known characteristic so as to detect the interference.
  • the spur detector is configured to receive the same frequency band on the same carrier, for a time frame within which no signal should be present for the ana- lyzed band/carrier, so that a spur line within the band/carrier can reliably be detected or measured.
  • the proposed approach/method is tackling an inherent issue of any signal processing system, namely spurs, in the digital domain. This improves the overall performance of the system, e.g. of the digital radio standard, such as DAB, minimizing the need for expensive processes of calibration and shielding.
  • Receivers, incurred with this method/approach can be brought to market much more swiftly and at lower costs. Moreo ver, the replacement of aging of electronic components which, typically affect spur pat- terns, does not require recalibration. This improves the long-lively of the overall system.
  • the receiving part comprises an FFT unit and a demapper.
  • the FFT unit is configured to transform a time signal into a frequency domain, e.g. in order to separate different carries from each other.
  • the carriers carrying the expected signal portion and the payload signal portion are transformed into the frequency domain.
  • the expected signal portion is available for each carrier separately so that inter ferences can be detected / measured per carrier.
  • the receiv- ing part may comprise an entity configured to instruct the expected signal portion and pro vide same to the spur detector according to further embodiments.
  • the demapper is con- figured to demap data from the respective carriers.
  • the demapper may be configured to output an LLR value indicated for the reliability of the demapping or an LLR value per carrier indicated for the reliability of the demapping of the respective carrier.
  • This LLR value is typically used by a forward error correction (FEC), e.g. being based on a Viterbi algorithm. Analyzing the expected signal portion enables to gain information whether (within the rel- evant band or carrier) an interferer like spurs are present.
  • the receiving part may comprise an additional entity which is configured to adapt the LLR value based on this knowledge. For example, in case of the presence of a spur, the LLR value for the carrier can be reduced, e.g. by a value (e.g.
  • the spur detector performs a power analysis of the expected signal portion. Background thereof is that the expected power in the expected signal por- tion may amount to 0, in case the expected portion is a null symbol. This has the conse quence that in case of determining a signal power larger than 0, it can be assumed that an interferer/spur lies within the analyzed band/carrier. Therefore, the signal power of the expected signal portion may be compared to a threshold.
  • this threshold may be set dependent on the received signal.
  • the LLR value may be adapted as follows:
  • the adaption of the LLR value may be performed after determining the LLR value (e.g. by use of the demapper).
  • the calculated LLR value is adapted reduced by a processor (weighting entity) arranged at the output of the de- mapper.
  • the above formula for the LLR adaption represents the result of the adaption.
  • the calculation of the LLR value performed by the demapper may be influenced directly. In this case the calculation is performed taking into account the detected / measured spurs / interferences, e.g. based on above formula for the LLR adap tion.
  • the receiver may be DAB or in general DAB / OFDM receiv- er. Consequently, the receiving path is according to embodiments configured to receive a DAB or in general OFDM signal.
  • a further embodiment provides a method for receiving a signal, e.g. a DAB service data (also referred to as Service Channel (SC), including a coded audio signal) or OFDM cod- ed signal.
  • the method comprising the steps of receiving the signal comprising an ex- pected signal portion (e.g. the null symbol) and a payload portion. These two signal por tions may be arranged in different time frames.
  • the method further comprises the step of analyzing the expected signal portion in order to detect an interference (e.g. an in-band narrowband spur overlapping the signal).
  • this method may be implemented as computer program.
  • an embodiment refers to a computer program having a program code for performing, when running on a computer, the method for receiving.
  • an embodiment provides a receiver having a receiving path configured to receive a signal comprising a payload portion, and a spur detector configured to analyze the receive signal in order to calculate a rating factor based on the interference analysis. Furthermore, the receiver comprises an entity for adapting/rating/scaling the LLR value.
  • the spur detector performs the spur detection based on an expected signal portion (see above) or based on the calcula- tion of a modulation error rate, or, based on another approach of detecting interferences within a signal.
  • Another embodiment provides a method for adapting the LLR value.
  • the method com- prises for the step of receiving a signal comprising a payload portion, analyzing the signal to detect an interference overlapping the signal, and adapting an LLR value indicative for the reliability of the receiving based on the detecting of the interferences.
  • the adapting may be performed by a rating or scaling.
  • Fig. 1a shows a schematic block diagram of a receiver according to an embodi ment
  • Fig. 1 b shows a schematic flow chart illustrating the method for receiving a signal according to an embodiment
  • Fig. 2 shows a schematic block diagram of a receiver according to a further em bodiment
  • Fig. 3a to 3c show schematically three diagrams illustrating a receive signal including interferences and the separation of the interferences and the residual signal for illustrating embodiments of the present invention.
  • Fig. 1 shows a receiver 10 having a receiving path 20 and a spur detector 30.
  • the receiv ing path is configured to receive a radio signal 12 (cf. schematically illustrated antenna), e.g. an OFDM signal.
  • This signal is also provided to the spur detector 30, e.g. by bypass of the receiver 20 (or directly, not shown).
  • the receiver 20 is configured to receive the signal 20 and to output a data stream, e.g. a bit stream 14, for example, this bit stream 14 may be processed by using FFT processing means, a demapper, and a forward error cor rection.
  • FFT processing means e.g. a bit stream 14
  • demapper demapper
  • a forward error cor rection e.g. a forward error cor rection
  • the spur detector 30 analyzes the signal 12.
  • the signal 12 may, for example, be a signal in the time domain having a known signal portion 12n and a payload portion 12p. These two signal portions 12n and 12p may be arranged in different subsequent time frames.
  • the known signal portion may be broadcast and, thus, received every transmission frame (e.g. every 96ms) on general or regular period between two payload portions.
  • the known signal portion may, for exam- pie, be a null symbol or other known signal, like a reference symbol or pilots, etc.
  • the spur detector 30 receives at least a known signal portion 12n, e.g. extracted from the entire signal 12 and analyzes same. Since the spur detector 30 has certain expectations, the received signal of a received portion 12n can be compared with the expectations.
  • a mis- match between the expectations and the received signal belonging to the expected signal portion is indicated for interferences overlapping the expected signal portion.
  • an estimation of the interference situation for the payload portion can be made.
  • the expectation regarding this portion is that the received signal has an energy level of 0.
  • a received signal corresponding to the expected signal portion having an energy level larger or signif icantly larger than 0 indicates an interferer. Since the expected signal portion is, according to embodiments, extracted from the receive path, e.g. after performing the FFT, the ex- pected signal portion analyzed by the spur detector represents only the relevant frequency band/carrier.
  • the detector 30 enables to detect an in-band spur. Due to the fact that within the expected signal portions no energy should be received over the entire analyzed band, the signal power larger than 0 also indicates a narrowband spur.
  • the in- formation regarding in-band narrowband spurs can be used to improve the forward error correction or to process the payload portion in order to improve the receiving quality.
  • Fig. 1 b shows the method 100 having two basic steps, namely the basic step of receiving the signal 102 and analyzing the expected signal portion 104.
  • the step 102 of receiving the signal may, be partially implemented in hardware or software. It becomes clearer, when considering that an OFDM system typically uses a FFT processing and a de- mapping algorithm. Both processing steps can be performed by means of a CPU. From another point of view, this means that the step 102 may comprise sub-steps of FFT trans formation and demapping.
  • the step 102 may optionally comprise the step of calculating the LLR value.
  • the ex pected signal portion 12n is analyzed (cf. step 104).
  • This step 104 may comprise optional sub-steps of performing power analysis and comparing the current signal power of the expected signal portion 12n with a threshold. A detailed description will be given with re- spect to Fig. 2.
  • the method 100 comprises an optional step 108 of adapting the LLR value based on the result of the step 102.
  • the LLR value is reduced when an interferer has been detected during the step 102 or remains non- amended in case of no interference has been detected.
  • the detection of interferences is preferably based on the analysis of an ex- pected signal portion, e.g. of the null symbol or a gap between two payload portions.
  • the interference situation may be estimated differently.
  • the MER value Modulation Error Rate
  • the method may comprise just the steps 104 and 108 as well as an additional step of performing a method for estimating the interference situation, e.g. by calculating the MER value (Modulation Error Rate) per carrier.
  • Fig. 2 shows another receiver 10’ comprising a receiving path 20’ and a spur detector 30.
  • the receiving path 20’ comprises at least an FFT (Fast Fourier Transformation) entity 22 and a demapper 24.
  • the FFT entity 22 transforms the receive signal from the time domain into the frequency domain. This enables to separate different carriers from each other.
  • the signal output of the FFT entity 22 is provided to the demapper 24 which demaps the transformed signal so as to output a bit stream based on the signal. During this de- mapping, typically, the LLR values indicative for the reliability of the output bits/bit stream may be calculated by the demapper 24.
  • the receive path 20’ may comprise at its input a synchronization entity 26 configured to synchronize the FFT entity 22 with the receive signal.
  • the synchronization may be performed based from detecting the re- spective signal portion 12n, such that the FFT entity 22 performs the transformation on the correct time frame, namely the time frame belonging to the signal portion 12p, wherein this signal portion may be subdivided into a plurality of time frames.
  • the re DC path 20’ may comprise a forward error correction 28 configured to use redundancy within the receive signal in order to correct receive errors/mapping errors.
  • the forward error correction unit 28 may, for example, be configured to perform the Viterbi algorithm. In order to improve this forward error correction efficiency FEC unit 28 uses the LLR val- ues (calculated by the demapper 24) to determine which of the received bits may be incor- rectly mapped. Between the demapper 24 and the FEC unit 28 a interleaver may be arranged.
  • the spur detector 30 is arranged.
  • the spur detector 30 that may, for example, get the signal to be analyzed (especially the expected signal por- tion 12n) from the FFT unit 22 or, an entity arranged at the output of the FFT unit 22.
  • This entity is marked by the reference numeral 23 and configured to forward the regular sym- bols belonging to the payload portion 12p to the demapper 24 and the expected signal portion 12n (null symbol) to the spur detector 30 selectively, i.e. that the entity 23 is con- figured to selectively distribute the receive signal (the receive signal in the frequency do- main) dependent on the respective symbol type.
  • the providing of the null sym bol/expected signal portion to the spur detector 30 may be performed in that manner that a plurality of portions corresponding to a plurality of carriers are forwarded.
  • the receiving path 20’ is a receiving path of a DAB system or another comparable system using null symbols for synchronization purposes.
  • the null symbol can be described as extended stretches of time, where no power is being transmitted.
  • the position e.g. 96ms in case of DAB Transmission Mode I or to a certain time having a constant repeating period
  • any power detected during the period must be stemming from spurs (in general interferences).
  • the disturbance power per carrier can - according to embodiments - be detected during the null symbol duration in the digital domain.
  • the algorithm may per- form the following steps:
  • this information regarding the presence of a spur in the rele vant carrier can be used to adapt the LLR values indicative for the reliability of the map- ping.
  • the receive path 20' may, for example, comprise a rating entity 25 and an output of the demapper 24 enabling to apply a rating/scaling factor (per carrier) to the re- spective LLR values so that the FEC unit 26 gets a corrected LLR value.
  • the adaption may be done as following:
  • the spurs/interferences can be removed from the signal, especially from the payload portion, as will be discussed with respect to Fig. 3a, b, and c.
  • Fig. 3a shows a receive signal plotted over the frequency including all interferences, i.e. the regular symbol belonging to the payload portion overlapped by spur interferences.
  • Document 3b illustrates the interferences/noise and spurs detected by analyzing the expected signal portion, hereby analyzing the null symbol. From a theoretical point of view, the power level for each frequency of the null symbol should amount to 0. However, due to noise, the theoretically expected signal is slightly interfered over the entire relevant fre- quency band. Furthermore, due to spurs at the frequencies FS1 , FS2, some frequencies are significantly interfered. When comparing the diagram of Fig. 3b with the diagram of Fig. 3a, it becomes clear that the high power level at the corresponding frequencies FS1 , FS2 within the payload portion result from the two detected spurs. Background thereof is that the naturally occurring spurs are distributing each received symbol equally so that the detected spurs in the special symbol, the null symbol, can be removed from other sym bols.
  • the payload portion signal can be corrected by subtracting the interference spectrum (cf. Fig. 3b) from the payload spectrum (cf. Fig. 3a) to obtain the symbols with removed spurs (Fig. 3c). It should be noted that typically, the spur reduction is performed per carrier.
  • the receive quality can be improved.
  • the main application is DAB audio systems
  • other broadcasting or OFDM sys- tems not using a regularly broadcasted null symbol (with no signal power inside) can be used in this described approach, too.
  • a similar algorithm can be used for gaps between two signal transmissions/payload portions. Within these gaps, the expected signal portion has an expected signal power of 0 so that the spur detection by measuring the signal power can be applied to this irregularly arranged signal portion.
  • the spur detector can use the modulation error rate (MER) per carrier.
  • MER modulation error rate
  • This modulation error rate can be used to scale the reliability of the corresponding LLR value. This enables that if there is no possibility to a distinguished signal from disturbance power (in case if there is no null symbol present in the system) to adapt/correct the LLR value, too. Therefore, according to embodiments, the adaption of the LLR value may be based on another spur detec- tion/interference detection approach.
  • aspects described in the context of an apparatus it is clear that these aspects also represent a description of the corresponding method, where a block or device corresponds to a method step or a feature of a method step. Analogously, aspects described in the context of a method step also represent a description of a corresponding block or item or feature of a corresponding apparatus.
  • Some or all of the method steps may be executed by (or using) a hardware apparatus, like for example, a microprocessor, a programmable computer or an electronic circuit. In some embodiments, some one or more of the most important method steps may be executed by such an apparatus.
  • the inventive encoded data (or audio) signal can be stored on a digital storage medium or can be transmitted on a transmission medium such as a wireless transmission medium or a wired transmission medium such as the Internet.
  • embodiments of the invention can be implemented in hardware or in software.
  • the implementation can be performed using a digital storage medium, for example a floppy disk, a DVD, a Blu-Ray, a CD, a ROM, a PROM, an EPROM, an EEPROM or a FLASH memory, having electronically readable control signals stored thereon, which cooperate (or are capable of cooperating) with a programmable computer system such that the respective method is performed. Therefore, the digital storage medium may be computer readable.
  • Some embodiments according to the invention comprise a data carrier having electroni- cally readable control signals, which are capable of cooperating with a programmable computer system, such that one of the methods described herein is performed.
  • embodiments of the present invention can be implemented as a computer pro- gram product with a program code, the program code being operative for performing one of the methods when the computer program product runs on a computer.
  • the program code may for example be stored on a machine-readable carrier.
  • inventions comprise the computer program for performing one of the methods described herein, stored on a machine-readable carrier.
  • an embodiment of the inventive method is, therefore, a computer program having a program code for performing one of the methods described herein, when the computer program runs on a computer.
  • a further embodiment of the inventive methods is, therefore, a data carrier (or a digital storage medium, or a computer-readable medium) comprising, recorded thereon, the computer program for performing one of the methods described herein.
  • the data carrier, the digital storage medium or the recorded medium are typically tangible and/or non transitionary.
  • a further embodiment of the inventive method is, therefore, a data stream or a sequence of signals representing the computer program for performing one of the methods de scribed herein.
  • the data stream or the sequence of signals may for example be configured to be transferred via a data communication connection, for example via the Internet.
  • a further embodiment comprises a processing means, for example a computer, or a pro grammable logic device, configured to or adapted to perform one of the methods de scribed herein.
  • a further embodiment comprises a computer having installed thereon the computer pro gram for performing one of the methods described herein.
  • a further embodiment according to the invention comprises an apparatus or a system con- figured to transfer (for example, electronically or optically) a computer program for performing one of the methods described herein to a receiver.
  • the receiver may, for exam ple, be a computer, a mobile device, a memory device or the like.
  • the apparatus or sys tem may, for example, comprise a file server for transferring the computer program to the receiver.
  • a programmable logic device for example a field programmable gate array
  • a field programmable gate array may cooperate with a microprocessor in order to perform one of the methods described herein.
  • the methods are preferably performed by any hardware apparatus.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Noise Elimination (AREA)

Abstract

L'invention porte sur un récepteur comprenant un trajet de réception et un détecteur de parasite. Le trajet de réception est conçu pour recevoir un signal comprenant une partie de signal attendue et une partie de charge utile. Le détecteur de parasite est conçu pour analyser la partie de signal attendue afin de détecter une interférence chevauchant le signal. La connaissance concernant les parasites détectés est utilisée pour augmenter les performances du récepteur DAB/OFDM.
EP19709943.5A 2018-05-17 2019-03-11 Récepteur et procédé de réduction de l'influence de parasites à bande étroite pendant une réception de signal ofdm Pending EP3794752A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP18172990.6A EP3570467A1 (fr) 2018-05-17 2018-05-17 Récepteur et procédé de réduction de l'influence de l'interférence à bande étroite pour la réception d'un signal ofdm
PCT/EP2019/056031 WO2019219266A1 (fr) 2018-05-17 2019-03-11 Récepteur et procédé de réduction de l'influence de parasites à bande étroite pendant une réception de signal ofdm

Publications (1)

Publication Number Publication Date
EP3794752A1 true EP3794752A1 (fr) 2021-03-24

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Application Number Title Priority Date Filing Date
EP18172990.6A Withdrawn EP3570467A1 (fr) 2018-05-17 2018-05-17 Récepteur et procédé de réduction de l'influence de l'interférence à bande étroite pour la réception d'un signal ofdm
EP19709943.5A Pending EP3794752A1 (fr) 2018-05-17 2019-03-11 Récepteur et procédé de réduction de l'influence de parasites à bande étroite pendant une réception de signal ofdm

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Application Number Title Priority Date Filing Date
EP18172990.6A Withdrawn EP3570467A1 (fr) 2018-05-17 2018-05-17 Récepteur et procédé de réduction de l'influence de l'interférence à bande étroite pour la réception d'un signal ofdm

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Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7646704B2 (en) 2006-10-31 2010-01-12 Motorola, Inc. Method and apparatus for spur cancellation in an orthogonal frequency division multiplexing communication system
KR100968127B1 (ko) 2008-11-25 2010-07-06 주식회사 텔레칩스 수신기의 ｃｃｉ／ｓｐｕｒ 잡음 제거 장치 및 방법
EP2863563B1 (fr) * 2008-12-19 2017-01-11 Nippon Telegraph And Telephone Corporation Système de communication sans fil pour la détection d'interference
CN107210979B (zh) * 2015-02-06 2020-11-27 瑞典爱立信有限公司 发射站点、接收站点及其中的方法

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WO2019219266A1 (fr) 2019-11-21

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