WO2004066531A1 - Procede et dispositif de detection de limites de trames d'origine a partir d'un systeme srl-amrc - Google Patents

Procede et dispositif de detection de limites de trames d'origine a partir d'un systeme srl-amrc Download PDF

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Publication number
WO2004066531A1
WO2004066531A1 PCT/CN2003/000060 CN0300060W WO2004066531A1 WO 2004066531 A1 WO2004066531 A1 WO 2004066531A1 CN 0300060 W CN0300060 W CN 0300060W WO 2004066531 A1 WO2004066531 A1 WO 2004066531A1
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output
module
frame
frame boundary
signal
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PCT/CN2003/000060
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English (en)
Chinese (zh)
Inventor
Chen Ji
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Linkair Communications, Inc.
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Priority to PCT/CN2003/000060 priority Critical patent/WO2004066531A1/fr
Priority to AU2003211284A priority patent/AU2003211284A1/en
Priority to CN03805479.5A priority patent/CN1640037A/zh
Publication of WO2004066531A1 publication Critical patent/WO2004066531A1/fr

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    • 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
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H04B1/7073—Synchronisation aspects
    • H04B1/7075—Synchronisation aspects with code phase acquisition

Definitions

  • the present invention relates to CDMA technology, and particularly relates to a downlink synchronization subsystem of the physical layer of a LAS-CDMA system. Specifically, the invention relates to an initial frame boundary detection method and device based on a LAS-C application A system. Background technique
  • the relevant peaks are extracted through filters matched with the downlink synchronization physical channels of all cells to implement frame boundary detection. Because all cells use different bipolar LA polarity sequences, the downlink synchronous matched filter can only perform matched filtering on time slots and perform LA non-coherent merging on the entire downlink synchronous physical channel. Because the downlink synchronization physical channel and the downlink traffic channel are time-division, a detection algorithm can be designed to improve the performance of the initial frame boundary detection.
  • An object of the present invention is to provide an initial frame boundary detection method and device based on a LAS-CDMA system, so as to improve the performance of initial frame boundary detection.
  • multiple or one signal is output, which are the correlations output under different thresholds.
  • Peak detection value multiply the signal output after LA matching and the multi-channel signal output after correlation peak detection.
  • the correlation peak detector only outputs one signal, only the signal output after LA matching needs to be multiplied with this signal. And perform frame boundary detection on the multiplied signals to obtain an initial frame boundary output.
  • Performing LS matching filtering on the input baseband signal and taking the modulo square includes the following steps: definition- ⁇ ;
  • shock response function of LS code matched filtering is:
  • the output signal is:
  • the LA matching means that: the LA matching module is a delay line with a length of a downlink synchronization physical channel, and uses an adder to implement energy combination of LS symbols.
  • the related peak detection refers to: performing delay processing, moving average processing, threshold processing, and LA matching processing on a signal from the LS code matched filter to obtain a detection output.
  • the frame boundary detection refers to: the frame boundary detector detects each signal that arrives within a frame time, and records the maximum energy value and the maximum position of each signal. If one frame time, a certain channel corresponding to the output If the maximum energy is 0, it is considered that no synchronization channel is detected on this way; otherwise, a synchronization channel is considered to exist.
  • the frame boundary detection further includes:
  • the frame boundary detector will complete the initialization of the entire module, the LS code matched filter, LA matching and initialization are completed, and start to work after entering a stable working state;
  • the mobile station first detects the output corresponding to the threshold C1, and if a synchronization channel is detected, Output the maximum energy position; otherwise, detect the output corresponding to the threshold C2, and output the maximum energy position if a synchronization channel is detected; otherwise, output the output corresponding to the threshold C3, and output the maximum energy position if a synchronization channel is detected; frame
  • the boundary detector will sequentially detect up to the threshold Cn, otherwise it is considered that no synchronization channel has been detected; the position of the maximum energy can be obtained according to the frame structure and then the frame boundary position can be obtained. The entire frame boundary detector will work until a synchronization channel is detected.
  • the mobile station first detects the output corresponding to the threshold C1, and if a synchronization channel is detected, outputs the maximum energy position + 25 * 4 as the frame boundary output; otherwise, it detects the output corresponding to the threshold C2, if a synchronization channel is detected , Outputting the maximum energy position + 25 * 4 as the frame boundary output; otherwise, detecting the output corresponding to the threshold C3, and outputting the maximum energy position + 25 * 4 as the frame boundary output if a synchronization channel is detected;
  • the frame boundary detector will sequentially detect up to the threshold Cn, otherwise it is considered that no synchronization channel is detected (here Cn> C3> C2> Cl); the entire frame boundary detector will work until the synchronization channel is detected.
  • the method according to the present invention further includes the following steps:
  • the multi-frame accumulation means adding the input of each frame time at the corresponding position in the frame, and after the M frame time has elapsed, inputting the result value of the M frame accumulation.
  • the frame boundary detection includes: the frame boundary detector will be initialized in the entire module, the LS code matching filter, the LA matching and the correlation peak detector have been initialized, and after entering the stable working state M frames start working;
  • the frame boundary detector works at 4fc rate; the frame boundary detector detects each signal that arrives within a frame time, and records the energy maximum and maximum position of each signal. If one frame time, a certain channel corresponds The maximum amplitude of the output is 0, it is considered that no synchronization channel is detected on this way, otherwise it is considered that there is a synchronization channel;
  • the mobile station first detects the output corresponding to the threshold C1, and outputs the maximum energy position if a synchronization channel is detected; otherwise, detects the output corresponding to the threshold C2, and outputs the maximum energy position if a synchronization channel is detected; otherwise, it detects the corresponding output of the threshold C3.
  • the invention also provides an initial frame boundary detection device based on a LAS-C picture A (TD-LAS) system, which includes: an LS matched filter, a modulo squaring module, a delay module, a LA matching module, and a correlated peak detector.
  • TD-LAS LAS-C picture A
  • the input baseband signal is first subjected to LS matching filtering, modulo squared, and divided into two channels; one channel is subjected to LA matching; the other channel is sent to a correlation peak detector to detect whether there is a possible downlink synchronization physical channel on the time delay; the correlation peak detection
  • the device outputs three signals, which are the detection values of the correlation peaks output under different thresholds. If the output is 1, there may be a downlink synchronization physical channel at this time delay. If the output is 0, there is no downlink at this time delay.
  • the delay of the delay module makes the additional processing delay of the two signals of the LS matched filter and the correlation peak detector equal;
  • the multi-channel or one-channel signals output from the LA matching module and the correlation peak detector are multiplied respectively and sent to the frame boundary detector to obtain the initial frame boundary output.
  • the input signal of the LS matched filter is: a baseband digital signal
  • the impulse response function of the LS matched filter is:
  • the LA matching module includes: an adder; the LA matching module is a delay line with a length of a downlink synchronous physical channel, and the adder can be used to implement energy combination of LS symbols.
  • the related peak detector includes:
  • Interpretation module A Its function is: if the input from the delay module A is greater than K1 multiplied by the input from the sliding average module A, then output 0, otherwise output the input from the delay module A;
  • Threshold module B Its function is: if the input of the self-delay module B is greater than K2 multiplied by the input of the self-sliding moving average module B, it outputs 1; otherwise it outputs 0;
  • the output of the threshold module C1 is 1; otherwise, the output of the threshold module C1 is 0; if the input of the LA matching module is greater than Th2, the output of the threshold module C2 is 1; otherwise, the output of the threshold module C2 is 0; if the input of the self-LA matching module is greater than Th3, the output of the threshold module C3 is 1; otherwise, the output of the threshold module C3 is 0; if the input of the self-LA matching module is greater than Thn, the output of the threshold module Cn is 1; otherwise, the threshold module C3 output is 0.
  • the frame boundary detector includes: the frame boundary detector will be initialized after the entire module is initialized, and the LS code matching filter, LA matching, and related peak detector have started to work stably;
  • the mobile station first detects the output corresponding to the threshold C1, and outputs the maximum energy position if a synchronization channel is detected; otherwise, detects the output corresponding to the threshold C2, and outputs the energy maximum position if a synchronization channel is detected; otherwise, it detects the threshold C3 Corresponding output if detected To the synchronization channel and output the maximum energy position; the frame boundary detector will sequentially detect until the alarm value
  • the device of the present invention further includes: a multi-frame accumulation module
  • the multi-frame accumulation module includes: adding an input in each frame time at a corresponding position in the frame, and inputting an M-frame accumulation value after the M frame time has elapsed.
  • the frame boundary detector includes: the frame boundary detector will be initialized in the entire module, the LS code matching filter, LA matching and related peak detectors have been initialized, and enters a stable working state M Work starts after frame; Among them: The frame boundary detector detects each signal that arrives in a frame time, and records the energy maximum and maximum position of each signal. If one frame time, the output amplitude of a certain channel is the largest The value is 0, it is considered that no synchronization channel is detected on this way, otherwise it is considered that there is a synchronization channel;
  • the mobile station first detects the output corresponding to the threshold C1, and outputs the maximum energy position if a synchronization channel is detected; otherwise, detects the output corresponding to the threshold C2, and outputs the energy maximum position if a synchronization channel is detected; otherwise, the detection threshold C3 corresponds If the synchronization channel is detected, the energy maximum position is output; otherwise, no synchronization channel is considered to be detected; the content of the multi-frame accumulator is set to 0, and the detection is performed again after M frame time; the entire frame boundary detector It will work until a synchronization channel is detected.
  • the maximum energy position can be obtained from the frame boundary position after processing according to the frame structure.
  • the beneficial effect of the present invention is to provide an initial frame boundary detection method and device based on the LAS-CDMA system, which improves the performance of the initial frame boundary detection.
  • FIG. 1 is a subframe structure diagram of a downlink synchronization channel
  • FIG. 2 is a structural diagram of a frame boundary detector
  • FIG. 3 is a structural diagram of an LS code matched filter
  • Figure 4 is a schematic diagram of a LA matching module
  • FIG. 5 is a structural diagram of a correlation peak detector
  • FIG. 6 is a structural diagram of a frame boundary detector using multi-frame accumulation
  • FIG. 7 is a structural diagram of a multi-frame accumulator
  • FIG. 8 is a structural diagram of a frame boundary detector using multi-frame accumulation.
  • the invention provides an initial frame boundary detection method and device based on the LAS-CDMA system, and verifies the feasibility of the present invention through simulation, and provides a reference for the synchronization implementation of the TD-LAS system.
  • the downlink synchronization physical channels of all cells use the same LS spreading code (see Table 1), and different modulation symbol code groups are used to distinguish the cells.
  • the downlink synchronization sub-frame has a total of 8 time slots, and the length of each time slot is shown in Table 2.
  • Each time slot transmits a downlink synchronization pulse with a length of 72 chips, including a C code of 24 chips and an S code of 24 chips.
  • a 24-chip guard band is reserved in the middle, and the downlink synchronization pulse is transmitted at the beginning of each time slot.
  • the LS code used for the downlink synchronization channel is complex digital, and the corresponding spreading and despreading is similar to QPSK, as shown in Table 4.
  • the 8 slots of the downlink synchronization subframe can transmit 8 modulation symbols.
  • a total of 8 bipolar mutually orthogonal code sequences can be obtained, such as each row or column of the 88 Walsh matrix.
  • These code sequences are called LA polar sequences (see Table 3).
  • 8 orthogonal LA polar sequences can support 8-cell / sector networking. To support larger network scale, consider combining with other cell identification methods, such as continuous pilot cell identification, or you can use Different cell / sector clusters use different LA guard intervals to expand the D-SYNPCH signal set. Table 1.
  • Spreading code (LS code) of the downlink synchronization channel (j V ⁇ T)
  • a correlation peak is extracted through a filter matched with the downlink synchronization physical channel of all cells to implement frame boundary detection. Because all cells use different bipolar LA polarity sequences, the downlink synchronization matching filter can only perform matching filtering on time slots and perform LA non-coherent combining on the entire downlink synchronization physical channel. Because the downlink synchronization physical channel and the downlink traffic channel are time-division, a detection algorithm can be designed to improve the performance of the initial frame boundary detection. The following describes the algorithm for initial frame boundary detection:
  • the structure of the initial frame boundary detection module is shown in Figure 2.
  • the input baseband digital signal rate is 4fc.
  • the input baseband signal is first subjected to LS matched filtering, modulo squared, and divided into two channels. Perform LA matching all the way to achieve energy combination of 8 LS symbols.
  • the other channel is sent to a correlation peak detector to detect whether a possible downlink synchronization physical channel exists on the time delay.
  • the correlation peak detector outputs three signals, which are the detection values of the correlation peaks output under different thresholds. If the output is 1, then there may be a downlink synchronization physical channel at this time delay; if the output is G, then there is no downlink synchronization physical channel at this time delay.
  • the delay of the delay module in Figure 2 is 49Tc, which is used to make the additional processing delay of the two signals equal.
  • the three signals of the output of the LA matching module and the output of the correlation peak detector are respectively multiplied and sent to the frame boundary detection module to obtain the initial frame boundary output.
  • the LS matched filter the LA matched module, the correlated peak detector, and the frame boundary detector are described respectively.
  • the impulse response function of the LS matched filter is:
  • Output signal is 5 t) ® / 7 (t)
  • the LA matching module is a delay line with a total length of 811 Tc for the downlink synchronization physical channel, and uses 8 adders to implement the energy combining of the LS symbols. Its structure is shown in Figure 4:
  • the function of the correlation peak detector is to detect whether there is a downlink synchronization physical channel at each time delay, and its structure is shown in Figure 5.
  • the description of each module of the correlation peak detector is as follows:
  • the length of the variable averaging module A is 24 chips, and the delay of the delay module A is 24 chips.
  • the delay of the delay module B is 25 chips, and the length of the variation averaging module B is 49 chips.
  • the structure of the LA matching module is the same as that of FIG. 3;
  • the output of the threshold module C1 is 1, otherwise the output of the cabinet module C1 is 0; if the input of the LA matching module is greater than 5, the output of threshold module C2 is 1; otherwise, the output of threshold module C2 is 1 0; if the input from the LA matching module is greater than 4, the output of the threshold module C3 is 1; otherwise, the output of the threshold module C3 is 0.
  • the frame boundary detector will be initialized after the entire module is initialized.
  • the role of the frame boundary detector is to sequentially detect all time phases within a frame time and select a possible frame boundary therefrom. After the signal output from the LS matched filter is combined with the energy of the LA symbol, it is multiplied with the detection output of different correlation peak thresholds and the result is sent to the frame boundary detector. Like the previous module, the frame boundary detector operates at 4 3 ⁇ 4 rate. The frame boundary detector detects each signal that arrives within a frame time, and records the energy maximum and maximum position of each signal. If the maximum energy output corresponding to a certain channel is 0 after one frame time, it is considered that Not detected on the way Any synchronization channel, otherwise a synchronization channel is considered to be present. The mobile station first detects the output corresponding to the threshold C1.
  • the energy maximum position + 25 * 4 is output as a frame boundary; otherwise, the output corresponding to the threshold C2 is detected. If a synchronization channel is detected, the energy maximum position is + 25 * 4 is the frame boundary output; otherwise, the output corresponding to the threshold C3 is detected. If a synchronization channel is detected, the energy maximum position + 25 * 4 is the frame boundary output. Otherwise, it is considered that no synchronization channel is detected.
  • the entire frame boundary detection module will work until a synchronization channel is detected.
  • Input signal output of baseband filter, signal rate
  • Output signal Frame boundary detection success flag: (lbi t)
  • Parameter configuration related peak detection module
  • the function of the multi-frame accumulator is to add the input of each frame time at the corresponding position in the frame. After the M frame time has passed, the accumulated value of the input M frame is input. Its structure is shown in Figure 7:
  • the threshold C1 is output as 1, otherwise the threshold C1 is output as 0; if the input for the LA match is greater than Thres -C2, 'the threshold C2 is output as 1; otherwise the threshold C2 is output as 0; If the self-matching input is greater than Thres-C3, the threshold C3 output is 1; otherwise, the threshold C3 output is 0.
  • the frame boundary detector will be initialized during the entire module, LS matched filter, LA matched and phased
  • the off-peak detector has worked:
  • the role of the frame boundary detector is to sequentially detect all time phases within a frame time and select a possible frame boundary among them.
  • the signal output from the LS matched filter is combined with the energy of the LA symbol, multiplied by different correlation peak threshold guess outputs, and the result is sent to the frame boundary detector.
  • the frame boundary detector works at 4fc rate. The frame boundary detector detects each signal that arrives within a frame time, and records the maximum energy value and the maximum position of each signal.
  • the mobile station first detects the output corresponding to the threshold C1. If a synchronization channel is detected, it outputs the energy maximum position + 25 * 4 as the frame boundary output; otherwise, it detects the output corresponding to the threshold C2. If a synchronization channel is detected, it outputs the energy maximum position. + 25 * 4 is the frame boundary output; otherwise, the output corresponding to the detection threshold C3, if the synchronization channel is detected, + 25 * 4 is the frame maximum output. Otherwise, it is considered that no synchronization channel is detected. Set the content of the multi-frame accumulator to 0, and test again after M * 30720Tc time.
  • the entire frame boundary detection module will work until a synchronization channel is detected.
  • Threshold C1 12;
  • Threshold-C2 14;
  • Threshold — C3 18;
  • the beneficial effect of the present invention is to provide an initial frame boundary detection method and device based on the LAS-CDMA system, which improves the performance of the initial frame boundary detection.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

la présente invention concerne un procédé et un dispositif permettant de détecter une limite de trame d'origine à partir d'un système SRL-AMRC (LAS-CDMA) au moyen d'un filtre de correspondance LS, consistant à extraire un mode et un carré pour les signaux de bande de base d'entrée. Le procédé consiste ensuite à répartir les signaux ; à retarder et à faire correspondre (LA) l'un des signaux des deux routes ; à procéder à une fusion d'énergie des symboles LS ; à procéder à une détection de lobes de corrélation pour l'autre signal des deux routes ; à détecter l'existence éventuelle d'un canal physique synchrone descendant au niveau du retard ; après détection des lobes de corrélation, à exporter des signaux de multiplexage ou un signal d'une seule route, qui correspondent respectivement aux valeurs de détection de lobes de corrélation exportées en deçà de certains seuils ; à multiplier le signal de sortie après mise en correspondance LA avec le signal de multiplexage de sortie, respectivement (lorsqu'un signal d'une seule route est exporté à partir du détecteur de lobes de corrélation, il est nécessaire que seul ce signal soit multiplié par le signal de sortie après mise en correspondance LA) ;à procéder à un détection de limite de trame pour le signal multiplié ; à obtenir la sortie de limite de trame d'origine. Ce procédé permet d'améliorer la détection des limites de trame d'origine.
PCT/CN2003/000060 2003-01-23 2003-01-23 Procede et dispositif de detection de limites de trames d'origine a partir d'un systeme srl-amrc WO2004066531A1 (fr)

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PCT/CN2003/000060 WO2004066531A1 (fr) 2003-01-23 2003-01-23 Procede et dispositif de detection de limites de trames d'origine a partir d'un systeme srl-amrc
AU2003211284A AU2003211284A1 (en) 2003-01-23 2003-01-23 A method and apparatus for detecting original frame boundary based on a las-cdma system
CN03805479.5A CN1640037A (zh) 2003-01-23 2003-01-23 一种基于las－cdma系统的初始帧边界检测方法及装置

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CN107276708A (zh) * 2016-04-08 2017-10-20 深圳超级数据链技术有限公司 定时同步方法、装置和系统
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CN107276944A (zh) * 2016-04-08 2017-10-20 深圳超级数据链技术有限公司 定时同步方法、装置和系统
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