WO2020101088A1 - Dispositif d'acquisition de synchronisation d'un système de communication sans fil à bande étroite pour l'ido, et procédé associé - Google Patents

Dispositif d'acquisition de synchronisation d'un système de communication sans fil à bande étroite pour l'ido, et procédé associé Download PDF

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Publication number
WO2020101088A1
WO2020101088A1 PCT/KR2018/014266 KR2018014266W WO2020101088A1 WO 2020101088 A1 WO2020101088 A1 WO 2020101088A1 KR 2018014266 W KR2018014266 W KR 2018014266W WO 2020101088 A1 WO2020101088 A1 WO 2020101088A1
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WIPO (PCT)
Prior art keywords
sequence
length
received signal
value
synchronization
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PCT/KR2018/014266
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English (en)
Korean (ko)
Inventor
이유성
김지은
송봉섭
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(주)네스랩
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/0055—Synchronisation arrangements determining timing error of reception due to propagation delay
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/001—Synchronization between nodes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/0035—Synchronisation arrangements detecting errors in frequency or phase

Definitions

  • the present invention relates to a synchronization acquisition apparatus and method for a narrowband wireless communication system for the Internet of Things, and more particularly, to a synchronization acquisition apparatus and method for improving signal detection and synchronization estimation performance.
  • the Internet of Things is a future infrastructure communication service in which all things are connected to the Internet and communicate directly with each other.
  • Internet of Things communication supports several kilometers of long-distance communication, and is mainly operated by low power by battery.
  • transmission / reception performance must be guaranteed through an efficient synchronous transmission / reception design, and a modem design for low power design and low power operation is required.
  • An object of the present invention is to provide a synchronization acquisition apparatus and method for improving signal detection and synchronization estimation performance in a narrowband wireless transmission / reception system.
  • a processing unit that detects a received signal vector including M received signal components by applying an M ⁇ L size reception window to the received signal, and a cross-correlation value between the received signal component and the second sequence,
  • An operation unit that calculates a timing metric for synchronization detection based on a delay correlation value between M sequence elements in the first sequence, and estimates a time point at which the timing metric becomes maximum as a starting point of the received signal
  • a synchronization obtaining apparatus including an estimation unit that performs synchronization detection.
  • timing metric R ( ⁇ ) may be defined by the following equation.
  • s (i) is the i-th sequence element among N sequence elements in the first sequence
  • y j is the j-th received signal component among the M received signal components
  • b is the second sequence including L sequence elements
  • ( ⁇ ) H denotes Hermitian transpose operation
  • ( ⁇ ) * denotes complex conjugate operation.
  • the length L of the second sequence may be determined by the following equation based on the frequency offset environment.
  • f s is a carrier frequency offset (CFO) generated between the transmitting and receiving terminals in the wireless communication system
  • f 0 represents a symbol rate frequency
  • the first sequence S M may be defined by the following equation.
  • s (i) is an i-th sequence element among M sequence elements in the first sequence
  • M 0 is a set of possible lengths of the first sequence
  • , , v (m) is a value generated using a random sequence c (m) to be.
  • c (m) is an m-sequence
  • the second sequence can be generated from a Barker code
  • the synchronous preamble is a Kronecker product between the first sequence of the length M and the second sequence of the length L. (Kronecker product).
  • the synchronization obtaining device the measurement unit for measuring the channel quality from the received signal, and comparing the measured channel quality with a reference channel quality value previously required by the system to determine the length M of the first sequence
  • the determination unit may further include a determination unit for finally determining a minimum M value among M values for the measured channel quality to be equal to or higher than the reference channel quality as the length of the first sequence.
  • the determining unit may determine the length M of the first sequence by the following equation.
  • M denotes the final determined M value
  • Q REQ ⁇ m ⁇ denotes the required reference channel quality value
  • Q EST denotes the measured channel quality value
  • the synchronization acquisition device is included in the reception device, the first and second sequences of information included in the synchronization preamble shared with the transmission device are used for the synchronization detection, and the reception device is the Signals can be transmitted and received using the synchronous preamble changed based on the determined M value.
  • the synchronization acquisition method comprises: measuring a channel quality from the received signal, and comparing the measured channel quality with a reference channel quality value previously required by the system to determine the length M of the first sequence, The method may further include finally determining a minimum M value of the M values for the measured channel quality to be equal to or higher than the reference channel quality as the length of the first sequence.
  • a transmission device that is shared with a device and transmits a transmission signal including the synchronous preamble to the reception device, and a reception including M reception signal components by applying an M ⁇ L size reception window to the reception signal received from the transmission device
  • a wireless communication device comprising a receiving device for detecting a signal vector and estimating a starting point of the received signal based on the detected received signal component and information of the first and second sequences of the shared synchronous preamble.
  • the receiving device measures the channel quality from the received signal, and then compares the measured channel quality with a reference channel quality value previously required by the system to determine the length M of the first sequence.
  • the minimum M value of the M values for one channel quality to be equal to or higher than the reference channel quality is finally determined as the length of the first sequence, and the receiving device changes the synchronization based on the determined M value.
  • Signal transmission and reception may be performed using a preamble.
  • the receiving device measures channel quality from the received signal, and compares the measured channel quality with a reference channel quality value previously required by the system, and the length of the first sequence. Determining M, the step of finally determining the smallest M value of the M values for the measured channel quality to be equal to or higher than the reference channel quality, as the length of the first sequence, and the final determined M value
  • the method may further include performing transmission / reception of a signal using the synchronous preamble changed based on the synchronous preamble.
  • an improved synchronous preamble structure is used to improve signal detection and synchronization estimation performance of a narrow-band wireless communication system, ensure the transmission and reception performance of the system, and provide an advantage of enabling efficient operation of the Internet of Things terminal. .
  • the combination of the two sequences constituting the synchronous preamble can be appropriately adjusted based on the cell operating environment and the frequency offset environment, so that it is possible to operate an adaptive transmission / reception system in a given environment and to improve / receive performance. Can be obtained.
  • FIG. 1 is a view showing a narrowband wireless communication system for the Internet of Things according to an embodiment of the present invention.
  • FIG. 2 is a diagram showing a transmission frame structure used in a narrowband wireless communication system according to an embodiment of the present invention.
  • FIG. 3 is a diagram illustrating the principle of generating a first sequence in an embodiment of the present invention.
  • FIG. 4 is a view for explaining the principle of generating a synchronous preamble through a combination of first and sequence in an embodiment of the present invention.
  • FIG. 5 is a view showing the configuration of a synchronization obtaining apparatus according to an embodiment of the present invention.
  • FIG. 6 is a view for explaining a method for obtaining synchronization using the synchronization obtaining apparatus of FIG. 5.
  • FIG. 7 is a diagram illustrating an initial synchronization acquisition process of a receiving end in an embodiment of the present invention.
  • FIG. 8 is a diagram illustrating an example of an Internet of Things wireless network operation method.
  • FIG. 9 is a diagram illustrating an adaptive transmission and reception method using the wireless communication system of FIG. 1.
  • FIG. 1 is a view showing a narrowband wireless communication system for the Internet of Things according to an embodiment of the present invention.
  • a narrowband wireless communication system for the Internet of Things includes a transmitting device 100 and a receiving device 200.
  • the transmitting device 100 generates a synchronous preamble for synchronization, and shares the generated information of the synchronous preamble with the receiving device 200. Then, the transmitting device 100 generates a transmission signal having a frame structure including a synchronous preamble and transmits it to the receiving device 200.
  • FIG. 2 is a diagram showing a transmission frame structure used in a narrowband wireless communication system according to an embodiment of the present invention.
  • the basic frame structure of the narrowband wireless communication system includes a 'synchronous preamble' for synchronization, a 'header' for PHY data transmission, and a 'payload' (PAYLOAD). Includes.
  • the synchronous preamble is composed of symbols of length N, and is composed of a sequence having excellent correlation characteristics for signal detection and synchronous detection.
  • the header includes scheduling information for the payload. This header section can be omitted in some cases.
  • the final payload section contains data to be actually transmitted.
  • the reception device 200 detects a received signal vector in the reception window by applying a reception window to the signal transmitted from the transmission device 100, and utilizes the detected reception signal vector and pre-shared synchronous preamble information to detect the received signal. Estimate the starting point and acquire frame synchronization.
  • the transmitting device 100 generates a synchronous preamble and transmits a transmission signal including the synchronous preamble to the receiving device 200, and the receiving device 200 signals from the signal received from the transmitting device 100
  • the present invention is not necessarily limited thereto.
  • communication devices such as a terminal or a terminal device have a built-in transmission function and a reception function, and can perform the function of the transmission device 100 or the reception device 200 depending on the situation. to be.
  • the embodiments of the present invention are described by distinguishing the names of the transmitting device 100 and the receiving device 200 for convenience of description, they cover a common communication device, terminal, etc., which have built-in wireless transmission and reception and signal processing functions. It can have meaning.
  • the combination of the first and second sequences may vary depending on the narrowband communication operating environment.
  • the length L of the first sequence may be adjusted according to the frequency offset environment, and the length M of the second sequence may be adjusted according to the channel environment.
  • the signal detection and synchronization estimation performance is improved in proportion to the length of the synchronous preamble, but the embodiment of the present invention is suitable for a given environment by adjusting a combination of two sequences according to a cell operating environment and a frequency offset environment. Improved transmission and reception performance can be obtained. This will be explained in detail later.
  • FIG. 3 is a diagram illustrating the principle of generating a first sequence in an embodiment of the present invention.
  • the first sequence for generating a synchronous preamble is configured based on a sequence having excellent autocorrelation and cross-correlation characteristics for signal detection and synchronization estimation between a transceiver (transmission / reception device).
  • the first sequence (cover sequence) S M can be generated according to Equation 1 below.
  • s (i) is an i-th sequence element among M sequence elements in the first sequence
  • M 0 is a set of possible lengths of the first sequence ( ) Indicates the maximum value set in advance ( ).
  • Equation 2 The sequence element v (m) redefined in the second row of Equation 1 is generated using c (m), which is a random sequence, and is expressed by Equation 2 below.
  • m (s) can be applied to c (m), which has excellent correlation characteristics and is advantageous for generating multiple independent sequences.
  • c (m) has excellent correlation characteristics and is advantageous for generating multiple independent sequences.
  • other random sequences may be applied in addition to the m-sequence.
  • FIG. 3 shows a first sequence generated using Equation (1).
  • the second sequence is constructed by applying a sequence having excellent autocorrelation characteristics to a relatively small length sequence. This second sequence is combined with the first sequence to support frequency offset estimation performance and operation in a low SNR region.
  • the synchronous preamble is generated through a combination of two sequences, as shown in Equation 4 and 4 below.
  • Equation 4 A B means the Kronecker product of matrices A and B.
  • the length M of the first sequence is applied to M i .
  • FIG. 4 is a view for explaining the principle of generating a synchronous preamble through a combination of first and sequence in an embodiment of the present invention.
  • M 8
  • the length L of the second sequence is determined by the transmission apparatus 100 according to the frequency offset environment, and is determined by a length satisfying Equation 5 below.
  • f s represents a carrier frequency offset (CFO) occurring between transceivers in an operating environment of a wireless communication system
  • f 0 represents a symbol rate frequency
  • FIG. 5 is a view showing the configuration of a synchronization acquisition apparatus according to an embodiment of the present invention
  • FIG. 6 is a diagram illustrating a synchronization acquisition method using the synchronization acquisition apparatus of FIG. 5.
  • the synchronization obtaining device 100 is applied to the receiving device 200 and may be included in the receiving device 200.
  • the synchronization obtaining apparatus 300 includes a receiving unit 310, a processing unit 320, a calculation unit 330, an estimation unit 340, a measurement unit 350, and It includes a determining unit 360.
  • the processing unit 320 detects a received signal vector by applying an M ⁇ L-sized receiving window to the received signal (S620).
  • the received signal vector includes M received signal components (y 0 , y 1 ,..., y M-1 ).
  • FIG. 7 is a diagram illustrating an initial synchronization acquisition process of a receiving end in an embodiment of the present invention.
  • the received signal is processed based on a window of LM size (M ⁇ L size).
  • the received signal is signal-processed in a combiner, correlation, metric buffer, and the like shown in FIG. 7 to thereby perform final signal detection and synchronization detection.
  • the received signal vector r in the receiving window is expressed by Equation 6 below.
  • the received signal vector r in the reception window is composed of N r (i), which can be further divided into M received signal components (y 0 , y 1 , ..., y M-1 ).
  • the operation unit 330 calculates a timing metric by combining the received signal component in the received signal vector with information of the first and second sequences previously shared from the transmitting device 100 (S630).
  • the calculation unit 330 based on the cross-correlation value (A) between the received signal component and the second sequence, and the delay correlation value (B) between M sequence elements in the first sequence, the timing metric for synchronization detection To calculate.
  • the timing metric R ( ⁇ ) may be expressed by Equation 7 below.
  • s (i) is the i-th sequence element among the N sequence elements in the first sequence
  • y j is the j-th received signal component among the M received signal components in the received signal vector
  • b is the second including L sequence elements
  • ( ⁇ ) H denotes Hermitian transpose operation
  • ( ⁇ ) * denotes a complex conjugate operation.
  • Equation 7 Is related to the cross-correlation value between the received signal component y and the second sequence b, Is related to a delay correlation value between M sequence elements s (i) included in the first sequence.
  • the calculation unit 330 calculates a timing metric by performing signal processing as described above on the received signal vector in the reception window. That is, the timing metric is calculated by applying m of Equation 7 from 0 to M-2 and adding up.
  • the estimation unit 340 performs synchronization detection by estimating a time point at which the timing metric becomes the maximum as the start point of the received signal (S640).
  • the estimator 340 may perform synchronization estimation for a time frame from the maximum value of the metric value, and estimate frequency synchronization by estimating the declination of the metric value.
  • Frequency synchronization estimation based on the declination estimation corresponds to a well-known method, so a detailed description is omitted.
  • the preamble parameter M is optimally determined based on the channel quality.
  • the reason for adjusting the preamble parameter is as follows.
  • FIG. 8 is a diagram illustrating an example of an Internet of Things wireless network operation method.
  • the IoT gateway may transmit a broadcast signal or a beacon signal to a nearby end device.
  • the Internet of Things which is generally installed at a predetermined location or a fixed location, is placed in different channel environments according to distances and locations, and thus, variations in received signal quality occur.
  • the measurement unit 350 first measures the channel quality of the received signal (S650). Techniques for measuring or estimating channel quality for a received signal have been well known.
  • channel quality of a selected type among signal to noise ratio (SNR), signal to interference ratio (SIR), and signal to interference plus noise ratio (SINR) may be used.
  • the determination unit 360 determines the length M of the first sequence by comparing the measured channel quality with a reference channel quality value previously required in the wireless communication system (S660).
  • the determination unit 360 finally determines the minimum M value among the M values for the measured channel quality to be equal to or higher than the reference channel quality as the length of the first sequence.
  • M ' is a final determined M value
  • Q REQ ⁇ m ⁇ is a reference channel quality value required by the system
  • Q EST is a measured channel quality value
  • the M 'value is greater than the current M value (M'> M)
  • M'> M it means that the length of the synchronous preamble must be increased to meet the demand level because the current channel state is lower than the system level.
  • M' ⁇ M since the M 'value is smaller than the current M value (M' ⁇ M), since the current channel state is higher than the required level of the system, the length of the synchronous preamble may be shortened or the preamble length may be reduced. It means there is no effect.
  • FIG. 9 is a diagram illustrating an adaptive transmission and reception method using the wireless communication system of FIG. 1.
  • the transmission apparatus 100 generates a synchronization preamble having a length N by combining the first sequence of the length M and the second sequence of the length L (S901), and generates a transmission signal having a frame structure in which the synchronization preamble is inserted. (S902), and transmits to the receiving device 200 (S903).
  • the reception apparatus 200 detects a reception signal vector including M reception signal components by applying a reception window to the reception signal received from the transmission apparatus 100 (S904).
  • the reception device 200 calculates a timing metric using the detected received signal component and information of the first sequence and the second sequence, and performs synchronization detection by estimating the starting point of the received signal based on the timing metric ( S905).
  • the reception device 200 measures the channel quality from the received signal and determines an optimal M value (M ') based thereon (S906). Then, the determined M 'value is compared with the current M value (S907).
  • the current parameters N (M, L) are maintained in the same case (S909), and the synchronization parameters are changed in different cases (S908). That is, the synchronization parameter is changed from N (M, L) to N '(M', L).
  • the reception device 200 performs transmission and reception using a synchronous preamble based on the corresponding parameter (S910).
  • the corresponding parameter may be a changed parameter or an existing parameter.

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  • Computer Networks & Wireless Communication (AREA)
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  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un dispositif d'acquisition de synchronisation d'un système de communication sans fil à bande étroite pour l'IdO, et un procédé associé. La présente invention concerne un dispositif d'acquisition de synchronisation, comprenant : une unité de réception pour recevoir, en provenance d'un dispositif de transmission, un signal de transmission comprenant un préambule de synchronisation de longueur N (= MxL) qui est constitué d'une combinaison d'une première séquence de longueur M et d'une seconde séquence de longueur L ; une unité de traitement pour détecter un vecteur de signal de réception comprenant M composantes de signal de réception, par application d'une fenêtre de réception présentant une taille de MxL à un signal de réception ; une unité de calcul pour calculer une métrique de synchronisation pour détecter une synchronisation, sur la base d'une valeur de corrélation croisée entre la composante de signal de réception et la seconde séquence, et une valeur de corrélation de retard parmi M éléments de séquence dans la première séquence ; et une unité d'estimation pour détecter une synchronisation par estimation, comme point de départ du signal de réception, d'un instant auquel la métrique de synchronisation est maximisée.
PCT/KR2018/014266 2018-11-15 2018-11-20 Dispositif d'acquisition de synchronisation d'un système de communication sans fil à bande étroite pour l'ido, et procédé associé WO2020101088A1 (fr)

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CN114172776A (zh) * 2021-11-06 2022-03-11 青岛鼎信通讯股份有限公司 一种基于中压载波系统的定时同步方法
CN115442244A (zh) * 2022-09-02 2022-12-06 南方电网科学研究院有限责任公司 电力实时仿真中通信间隔的校准方法、装置及相关设备

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