[go: up one dir, main page]

WO2025058582A1 - Système de communication ayant une estimation améliorée et procédé associé - Google Patents

Système de communication ayant une estimation améliorée et procédé associé Download PDF

Info

Publication number
WO2025058582A1
WO2025058582A1 PCT/TR2023/051485 TR2023051485W WO2025058582A1 WO 2025058582 A1 WO2025058582 A1 WO 2025058582A1 TR 2023051485 W TR2023051485 W TR 2023051485W WO 2025058582 A1 WO2025058582 A1 WO 2025058582A1
Authority
WO
WIPO (PCT)
Prior art keywords
signal
unit
model
adaptive filter
transmitter
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
PCT/TR2023/051485
Other languages
English (en)
Inventor
Huseyin AKCA
Ebubekir MEMISOGLU
Huseyin Arslan
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.)
Ulak Haberlesme AS
Original Assignee
Ulak Haberlesme AS
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
Priority claimed from TR2023/011334 external-priority patent/TR2023011334A1/tr
Application filed by Ulak Haberlesme AS filed Critical Ulak Haberlesme AS
Publication of WO2025058582A1 publication Critical patent/WO2025058582A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • H04L25/0202—Channel estimation
    • H04L25/0224—Channel estimation using sounding signals
    • H04L25/0226—Channel estimation using sounding signals sounding signals per se
    • 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
    • H04L25/03343—Arrangements at the transmitter end

Definitions

  • Invention relates to a communication system comprising a transmitting unit having a signal generator for generating a first signal, a T ransmitter RF front end for processing said first signal and outputting a second signal, at least a transmitting antenna for transmitting said second signal; comprising a receiving unit having a receiving antenna for receiving received second signal; a receiver RF front end for processing received second signal; a processing unit for comparing time shifted, received second signal and a pilot signal.
  • Matched filter which is also known as correlator receiver, optimum detector, is a kind of detector used in communication systems to maximize the probability of detection. In communication systems matched filter is utilized in steps such as synchronization, channel estimation, equalization to detect the transmitted symbols from transmitter.
  • US2020099566 discloses a new method to detect synchronization signal at Narrow Band IOT (NB IOT) applications at User Equipment (UE). For this detection, several matched filters whose size is fitting to each of Orthogonal frequency-division multiplexing (OFDM) symbol used for synchronization are utilized. These matched filters gather the OFDM symbols having both normal cyclic prefix (NCP) and extended cyclic prefix (ECP) and constitute correlation peaks when the detection is realized.
  • NCP normal cyclic prefix
  • ECP extended cyclic prefix
  • this method claims that it works in the case when Narrow Band Primary Synchronization Signal (NBPSS) and Narrow Band Secondary Synchronization Signal (NBSS) are used.
  • US2004047368 discloses frame synchronization in an OFDM system involves calculating a frame synchronization result as a complementary weighted summation of a matched filtered technique, and an autocorrelation technique.
  • a preamble of ten short training symbols (five predetermined symbols, repeated twice) is transmitted in an OFDM system to provide a basis for performing the matched filter and autocorrelation techniques.
  • the complementary weighted summation is performed using parameters alpha and (1 -alpha), in which alpha belongs to the set of numbers between zero and one. Desirably, alpha is in the range 0.5 to 0.9.
  • Improved (or at least equivalent) synchronization failure rate and bit error rate performance results, compared with either the matched filter technique and the autocorrelation technique alone.
  • the synchronization process include matched filter step to find peak points for frame synchronization. Also, channel estimation step is so important to reveal the distortion of the emitted symbols from transmitter. By realizing perfect channel estimation, it is increased the reliability and make easier equalization step. And at channel estimation step, it is used pilot symbols which is known at receiver.
  • Communication systems use pilot symbols for channel estimation to increase communication performance.
  • hardware characteristics of transmitting components of transmitting device may vary over time. This causes a pilot signal that is affected by hardware characteristic variances to be correlated with a received signal.
  • THz communication and ISAC are one of the prominent technologies expected to include to 6G system. And we know from the prior art that, the more the frequency increases, the more RF impairment effects of hardware characteristics increase as well. This situation will communication performance to distort reference signal and/or pilot symbols even further.
  • An object of the invention is to increase communication performance of communication systems.
  • a communication system comprising a transmitting unit having a signal generator for generating a first signal, a Transmitter RF front end for processing said first signal and outputting a second signal, at least a transmitting antenna for transmitting said second signal; comprising a receiving unit having a receiving antenna for receiving received second signal; a receiver RF front end for processing received second signal; a processing unit for comparing time shifted, received second signal and a pilot signal acquired from transmitting unit that is representing the first signal.
  • an adaptive filter unit which comprises at least an adaptive filter connected between input and output of the Transmitter RF front end and configured to model said Transmitter RF front end or said adaptive filter unit comprising plurality of adaptive filters each connected between input and output of at least some of the processing components of Transmitter RF front end, each configured to model respective processing component of Transmitter RF front end; a model generating unit which is configured to receive model parameters from adaptive filter/s and generate a hardware equivalent model for Transmitter RF front end; model generating unit is configured to apply the first signal to hardware equivalent model and store acquired output signal as pilot signal in a memory unit in order to be transmitted to receiver unit.
  • hardware characteristics of components are considered in matching filter process, enabling increased performance in synchronization, equalization and channel estimation steps of communication systems which utilize estimation step.
  • Transmitter RF front end comprises at least D/A converter, at least a mixer, at least a power amplifier and at least a local oscillator; adaptive filter unit comprises at least a first adaptive filter connected between input and output of said D/A converter, a second adaptive filter connected between input and output of said mixer, a third adaptive filter connected between input and output of said power amplifier and a fourth adaptive filter connected between input and output of said local oscillator.
  • a possible embodiment of the invention is characterized in that comprising a receiver adaptive filter circuit having at least an adaptive filter connected between input and output of the receiver RF front end and configured to model the receiver RF front end or said receiver adaptive filter unit comprising plurality of adaptive filters each connected between input and output of at least some of the processing components of receiver RF front end, each configured to model respective processing component of receiver RF Front end; another model generation unit or said model generation unit is configured to receive model parameters from adaptive filter/s and generate a receiver hardware equivalent model for receiver RF front end and configured to divide the received second signal into receiver hardware equivalent model for removing hardware characteristic effects of receiver RF front end on received second signal.
  • Invention is also a pilot signal generating method for a processing unit where said processing unit is configured to compare a received second signal with a stored pilot signal where the pilot signal represents a second signal that was processed from a first signal by an Transmitter RF front end, and said second signal was transmitted by a transmitting antenna; and where said received second signal is received and processed version of the transmitted second signal; characterized in that comprising steps of:
  • a model generating unit generating hardware equivalent model of Transmitter RF front end using model parameters
  • the pilot signal generating method which produce a signal sequence by considering hardware characteristics, can be implemented in existing 3GPP standards as indicated TS38.21 1 physical channels and modulation.
  • Invention is also an integrated sensing and communication system comprising one embodiment of above mentioned communication system.
  • integrated sensing and communication systems can also be improved.
  • Figure 1 is a drawing illustrating top schematic view of the communication system.
  • Figure 2 is a drawing illustrating Transmitter RF front end of a transmitting unit.
  • Figure 3 is a drawing illustrating a hardware model.
  • Figure 4 is a drawing illustrating top schematic view of an another embodiment of the communication system. REFERENCE NUMBERS GIVEN IN THE FIGURE
  • Invention is a communication system (10) that increases accuracy of estimation step of channel estimation, synchronization or equalization between a transmitting unit (100) and a receiving unit (200) using a pilot signal that is generated using a hardware equivalent model (150) of Transmitter RF front end (1 10) of a transmitting unit (110) of said communication system (100).
  • communication system (100) comprises a transmitting unit (100) having a signal generator (161 ) for generating a first signal to be transmitted.
  • Transmitting unit (100) comprises an RF front end (1 10) connected to signal generator (161 ) for processing generated first signal and outputting a second signal.
  • Transmitter RF front end (110) is responsible for conditioning the first signal before it is transmitted.
  • Transmitter RF front end (110) may comprise processing components for converting first signal to analogue; components for mixing signals; components for amplifying or filtering signals.
  • Transmitter RF front end’s (110) output signal is defined as second signal.
  • Transmitter RF front end (1 10) may comprise more well-known components that are not explicitly disclosed herein.
  • Communication system (10) comprises a transmitting antenna (162) for transmitting processed second signal.
  • Transmitter RF front end (1 10) is well known in the art used in transmitting devices such as User Equipment, base station etc.
  • Communication system (10) comprises receiving unit (200) having a receiving antenna (210) that receives transmitted second signal.
  • Communication system (10) comprises a receiver RF front end (220) for preprocessing received second signal.
  • Receiver RF front end (220) may comprise amplifiers and filtering elements, or other elements that are known to be utilized in receiver RF front end (220) in receiver units (200) such as user equipment, base station etc.
  • Receiver RF front end’s (220) purpose is to process signal in such way output signal is received version of the second signal.
  • correlating received second signal with a pilot signal representing the second signal provides correlation results in order to be used in estimation, equalization and channel estimation.
  • Receiving unit (200) comprises a processing unit (230) which compares time shifted version of received second signal, and a reference signal accessed from a memory unit (140) where said reference signal represents a similar signal to second signal. This process is called optimum estimation. In more detail optimum estimation may be realized by matched filters. Matching filter or optimum estimation methodologies are also well-known in the art, thus it is not disclosed explicitly herein.
  • Processing unit (230) may be a processor that is programmed to realize above mentioned functions.
  • Receiver unit (100) comprises an adaptive filter unit (130).
  • Adaptive filter unit (130) comprises at least an adaptive filter connected between input and output of the Transmitter RF front end (110) and configured to model said T ransmitter RF front end (1 10) or it comprises plurality of adaptive filters each connected between input and output of at least some of the processing components of Transmitter RF front end (1 10), each configured to model respective processing component of Transmitter RF front end (110) and generate model parameters.
  • adaptive filter is connected to input of Transmitter RF front end (110) and output of Transmitter RF front end (110). Adaptive filter receives input signal and outputs an output signal.
  • Transmitter RF front end (110) and output of adaptive filter is subtracted from each other and end result is compared to with an error tolerance signal.
  • Adaptive filter is configured to reconfigure its internal model in order to generate an output which satisfies error tolerance on each iteration.
  • a model parameter for Transmitter RF front end (110) is generated.
  • plurality of adaptive filters are connected each component of Transmitter RF front end (1 10) individually.
  • model parameters for each component is generated.
  • Transmitter unit (100) comprises a model generating unit (120).
  • Model generating unit (120) receives model parameter/s from adaptive filter/s and generates a hardware equivalent model (150) for T ransmitter RF front end (1 10).
  • This model is a mathematical model that is generated using model parameters. For instance, model parameters of serially connected components may be multiplied in order to generate a model in an embodiment.
  • Mathematical model is a model that takes the first signal as input and outputs a signal. Outputted signal is stored on a memory unit (140) as pilot signal. Since, model is generated based on hardware characteristics of components, a pilot signal is more similar to second signal that is outputted from Transmitter RF front end (1 10).
  • a predetermined calibration signal may be generated during model generation.
  • matching filter utilizes pilot signal that is outputted from hardware equivalent model (150) of Transmitter RF front end (1 10).
  • Transmitter RF front end (110) comprises D/A converter (1 1 1 ) for converting first signal to analogue.
  • a local oscillator (114) is provided.
  • a mixer (112) is provided for mixing local oscillator’s (114) signal with first signal.
  • An amplifier is provided for amplifying first signal.
  • a first adaptive filter (131 ) is connected to D/A D/A (1 11 ).
  • a second adaptive filter (132) is connected to mixer (1 12).
  • a third adaptive filter (133) is connected to power amplifier (1 13) and a fourth adaptive filter (134) is connected to local oscillator (114).
  • Each adaptive filter models respective component and generates model parameters.
  • model generating unit (120) receives first model parameter (151 ) from first adaptive filter; (131 ) second model parameter (152) from second adaptive filter; (132) third model parameter (153) from third adaptive filter (133) and fourth model parameter (154) from fourth adaptive filter (134). Model generating unit (120) then utilizes said model parameters and generates hardware equivalent model (150) of Transmitter RF front end (110).
  • Invention is also a model generation method. It comprises below steps:
  • an adaptive filter unit (130) connected to Transmitter RF front end (1 10) modelling Transmitter RF front end (1 10) and generating model parameters;
  • model generating unit 120 by a model generating unit (120), generating hardware equivalent model (150) of T ransmitter RF front end (1 10) using model parameters;
  • This method may be applied to any device that utilizes matching filter which compares transmitted and received signals, such as radar systems.
  • first signal is generated for synchronization, channel estimation or equalization purposes between transmitting unit (100) and receiving unit (200), first signal is applied to hardware equivalent model (150) and pilot signal is generated. Then, pilot signal is transmitted to processing unit (230). This transmission may be realized using any method known in the art, such as, down conversion and digitization respectively. Pilot signal is used by processing unit (230) in order to correlate known pilot signal and received second signal over a channel to synchronize frame.
  • channel estimation is realized to model channel towards amplitude and phase distortions.
  • There are different channel estimator techniques like Least Square (LS) estimator, Maximum Likelihood (ML) estimator by processing known pilot symbols and received symbols associated to pilot symbols.
  • LS Least Square
  • ML Maximum Likelihood
  • Pilot signal may be updated on predetermined periods.
  • Adaptive filters reconfigures model parameters of its structure until error compensation is met for subtraction of output signal of T ransmitter RF front end (110) and output signal of adaptive filter.
  • the invention is also an integrated sensing and communication (ISAC) system which comprises one of the embodiments of above mentioned communication system (100).
  • ISAC systems are systems that utilize transmitted signal of radar system (100) for both detection and data transmission.
  • receiving unit (200) may comprise a receiver adaptive filter unit (240) for modelling receiver RF front end (220).
  • Another model generation unit (not shown) is configured to receive model parameters from receiver adaptive filter unit (240) and generate a receiver hardware equivalent model of receiver RF front end (220).
  • Processing unit (230) divides received second signal with generated model and removes hardware effects on received signal. Processing unit (230) then realizes correlation processes using reference signal and received second signal that was cleaned of baseband characteristics of receiver RF front end (172).

Landscapes

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

Abstract

La présente invention concerne un système de communication (100) comprenant une unité d'émission (100) ayant un générateur de signal (161) pour générer un premier signal, une extrémité frontale d'émetteur RF (110) pour traiter ledit premier signal et délivrer en sortie un second signal, au moins une antenne d'émission (162) pour émettre ledit second signal; une unité de réception (200) ayant une antenne de réception (210) pour recevoir un second signal reçu; une extrémité frontale de récepteur RF (220) pour traiter le second signal reçu; une unité de traitement (230) pour comparer un second signal reçu décalé dans le temps et un signal pilote acquis par l'unité d'émission (100) et représentant le premier signal. Le système est caractérisé en ce qu'il comprend au moins une unité de filtres adaptatifs (130) qui comprend au moins un filtre adaptatif connecté entre l'entrée et la sortie de l'extrémité frontale d'émetteur RF (110) et configuré pour modéliser ladite extrémité frontale d'émetteur RF (110), ou ladite unité de filtres adaptatifs (130) comprenant une pluralité de filtres adaptatifs connectés chacun entre l'entrée et la sortie d'au moins certains des composants de traitement de l'extrémité frontale d'émetteur RF (110), chaque filtre étant configuré pour modéliser un composant de traitement respectif de l'extrémité frontale d'émetteur RF (110); une unité de génération de modèle (120) qui est configurée pour recevoir des paramètres de modèle en provenance d'un ou de plusieurs filtres adaptatifs et générer un modèle équivalent matériel (150) pour l'extrémité frontale d'émetteur RF (110), l'unité de génération de modèle (120) étant configurée pour appliquer le premier signal au modèle équivalent matériel (150) et stocker un signal de sortie acquis en tant que signal pilote dans une unité de mémoire (140) afin de le transmettre à l'unité de réception (200).
PCT/TR2023/051485 2023-09-12 2023-12-06 Système de communication ayant une estimation améliorée et procédé associé Pending WO2025058582A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TR2023/011334 TR2023011334A1 (tr) 2023-09-12 Geli̇şmi̇ş tahmi̇n özelli̇ği̇ne sahi̇p bi̇r i̇leti̇şi̇m si̇stemi̇ ve bunun bi̇r yöntem
TR2023011334 2023-09-12

Publications (1)

Publication Number Publication Date
WO2025058582A1 true WO2025058582A1 (fr) 2025-03-20

Family

ID=95022433

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/TR2023/051485 Pending WO2025058582A1 (fr) 2023-09-12 2023-12-06 Système de communication ayant une estimation améliorée et procédé associé

Country Status (1)

Country Link
WO (1) WO2025058582A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1524351A (zh) * 2001-05-17 2004-08-25 �����ɷ� 无线通信系统中用自适应算法调整组合器权重的方法和装置
US20140086356A1 (en) * 2011-10-27 2014-03-27 Lsi Corporation Software Digital Front End (SoftDFE) Signal Processing
CN112260771A (zh) * 2020-04-28 2021-01-22 广州市埃特斯通讯设备有限公司 一种用于etc的干扰信息检测系统

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1524351A (zh) * 2001-05-17 2004-08-25 �����ɷ� 无线通信系统中用自适应算法调整组合器权重的方法和装置
US20140086356A1 (en) * 2011-10-27 2014-03-27 Lsi Corporation Software Digital Front End (SoftDFE) Signal Processing
CN112260771A (zh) * 2020-04-28 2021-01-22 广州市埃特斯通讯设备有限公司 一种用于etc的干扰信息检测系统

Similar Documents

Publication Publication Date Title
CN114667719B (zh) 用于otfs导频干扰检测的差分功率分析
KR100555508B1 (ko) 직교 주파수 분할 다중 수신 시스템에서의 임펄스 잡음억제 회로 및 방법
CN101729461B (zh) 消除单频干扰及多频干扰的系统及方法
US20070058694A1 (en) Methods and apparatus for generating and utilizing training codes in a space division multiplexing communication system
JP2012213151A (ja) プリアンブルによる同期のためのフィルタバンクを用いたマルチキャリア信号の処理
US8290459B2 (en) Signal processing device and method for detecting and locating spectral shapes
KR102341875B1 (ko) 송신기 및 수신기와 해당 방법들
CN101128989A (zh) 用于同步无线接收机的方法和装置
US11641303B2 (en) System and method for performing orthogonal frequency-division multiplexing (OFDM) based radar detection
US8831079B2 (en) Apparatus and method for detecting symbol rate
WO2018030920A1 (fr) Procédé de compensation de l'influence du bruit de phase sur la transmission de données dans un canal radio
CN111989877A (zh) 在模拟扩频系统中执行同步的装置和接收器
JP3740434B2 (ja) パルス受信分析装置及びパルス受信分析方法
GB2343311A (en) A multicarrier receiver using a weighted sum of pilot powers to detect mistuning
WO2025058582A1 (fr) Système de communication ayant une estimation améliorée et procédé associé
US11342946B1 (en) Neural network kernels for signal processing in lieu of digital signal processing in radio receivers
JP6915525B2 (ja) 広帯域無線通信システムのチャネル推定装置およびチャネル推定方法
KR101215968B1 (ko) 변조 비콘 신호 처리 장치
JP4506248B2 (ja) 同期装置及び同期方法
EP1716683A1 (fr) Reception de communications a compensation de frequence
TR2023011334A1 (tr) Geli̇şmi̇ş tahmi̇n özelli̇ği̇ne sahi̇p bi̇r i̇leti̇şi̇m si̇stemi̇ ve bunun bi̇r yöntem
JP3630581B2 (ja) 拡散変調信号受信装置
JP6948203B2 (ja) 無線通信装置
KR101932991B1 (ko) 무선 통신 시스템에서 신호 수신 장치 및 방법
JP3639120B2 (ja) 拡散変調信号受信装置

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 23952396

Country of ref document: EP

Kind code of ref document: A1

DPE1 Request for preliminary examination filed after expiration of 19th month from priority date (pct application filed from 20040101)