WO2020082715A1 - 一种不依赖导频的 ccsk 信号捕获方法 - Google Patents

一种不依赖导频的 ccsk 信号捕获方法 Download PDF

Info

Publication number
WO2020082715A1
WO2020082715A1 PCT/CN2019/085440 CN2019085440W WO2020082715A1 WO 2020082715 A1 WO2020082715 A1 WO 2020082715A1 CN 2019085440 W CN2019085440 W CN 2019085440W WO 2020082715 A1 WO2020082715 A1 WO 2020082715A1
Authority
WO
WIPO (PCT)
Prior art keywords
signal
ccsk
receiver
maximum value
received
Prior art date
Application number
PCT/CN2019/085440
Other languages
English (en)
French (fr)
Inventor
邹德岳
赵楠
刘鑫
Original Assignee
大连理工大学
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 大连理工大学 filed Critical 大连理工大学
Publication of WO2020082715A1 publication Critical patent/WO2020082715A1/zh

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00Modulated-carrier systems
    • H04L27/26Systems using multi-frequency codes
    • H04L27/2601Multicarrier modulation systems
    • H04L27/2647Arrangements specific to the receiver only
    • H04L27/2655Synchronisation arrangements
    • H04L27/2662Symbol synchronisation
    • H04L27/2663Coarse synchronisation, e.g. by correlation
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details 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
    • H04B1/69Spread spectrum techniques
    • H04B1/707Spread spectrum techniques using direct sequence modulation
    • H04B1/7073Synchronisation aspects
    • H04B1/7075Synchronisation aspects with code phase acquisition

Definitions

  • the invention belongs to the technical field of communication engineering, and relates to CCSK signals, in particular to a CCSK signal acquisition method that does not depend on pilots.
  • CCSK signals including CCSK signals with multi-peak dynamic combination, are based on CDMA signals, and transmit information by cyclically shifting the spreading sequence.
  • the traditional CDMA signal detection method simultaneously completes the signal capture by means of matched filtering.
  • the order of the pseudo-random sequence in the CCSK signal is changed, its synchronization performance is destroyed. Therefore, the CDMA signal detection method cannot complete the acquisition function.
  • the traditional CCSK signal realizes signal synchronization by adding a pilot channel, but its disadvantage is that the pilot signal will occupy limited channel resources.
  • the present invention provides a method for CCSK signal detection without relying on a pilot channel.
  • a pilot-independent CCSK signal acquisition method the receiver correlates multiple sets of received data with phase differences in parallel in parallel to obtain a peak array.
  • the received signal corresponding to the maximum value in the peak array is the signal synchronized with the local sequence.
  • the receiver correlates the received signal C1 (a) with the local sequence L (a) through parallel correlation operations to obtain the correlation function R (a). Take the absolute value of the correlation function R (a) and find the maximum value as P (1).
  • the receiver collects a full period of CCSK signal C2 (a).
  • This signal is not a synchronous periodic relationship with the one-period signal received before, but there is a phase difference with the previous-period signal.
  • the phase difference is t chip width time, and t is less than or equal to 0.5 chips.
  • the peak array is a receiver that performs parallel correlation on multiple sets of received data with phase differences over the entire period.
  • the absolute value of the correlation function obtained by the correlation operation between the received data and the local sequence in each period is taken.
  • the maximum value of the absolute value is the peak array An element. Multiple sets of received data with phase differences over the entire period, whose initial phase covers a complete code sequence period.
  • the receiver uses the received signal Cx (a) as the reference and receives the data with the length of the spreading sequence as the period. At this time, the local sequence L and the reception sequence C are synchronized, that is, the capture function is completed.
  • the effect and benefit of the present invention is to achieve CCSK signal acquisition without relying on the pilot channel.
  • FIG. 1 It is a signal processing flowchart.
  • the receiver correlates the received signal C1 (a) with the local sequence L (a) through parallel correlation operations to obtain the correlation function R (a).
  • the receiver collects a full period of CCSK signal C2 (a). This signal is not a synchronous periodic relationship with the one-cycle signal received before, but there is a 0.5 / 1023ms between the previous period signal Phase difference
  • the receiver takes the received signal Cx (a) as the reference and receives the data with the length of the spreading sequence as the period. At this time, the local sequence L and the reception sequence C are synchronized, that is, the capture function is completed.

Landscapes

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

Abstract

一种不依赖导频的CCSK信号捕获方法,属于通信工程技术领域。该方法中接收机对多组具有相位差的整周期接收数据进行并行相关,得出峰值数组。峰值数组中的最大值所对应的接收信号,既是与本地序列同步的信号。本发明的效果和益处是不依赖导频信道的情况下实现对CCSK信号的捕获。

Description

一种不依赖导频的CCSK信号捕获方法 技术领域
本发明属于通信工程技术领域,涉及到CCSK信号,特别涉及到一种不依赖导频的CCSK信号捕获方法。
背景技术
CCSK信号,包括多峰值动态组合的CCSK信号,都是在CDMA信号的基础上,通过将扩频序列循环移位的方式传递信息的。传统的CDMA信号检测手段通过匹配滤波的方式同时完成信号的捕获。但由于CCSK信号中伪随机序列的顺序被改变,其同步性能被破坏。因此,CDMA信号检测手段无法完成捕获功能。传统的CCSK信号通过加入导频信道的方式来实现信号同步,但其缺点是导频信号会占用有限的信道资源。
技术问题
针对现有技术存在的问题,本发明提供一种不依赖导频信道而进行CCSK信号检测的方法。
技术解决方案
本发明采用的技术方案如下:
一种不依赖导频的CCSK信号捕获方法,该方法中接收机对多组具有相位差的整周期接收数据进行并行相关,得出峰值数组。峰值数组中的最大值所对应的接收信号,既是与本地序列同步的信号。具体步骤如下:
(1)接收机采集一个整周期的CCSK信号C1(a),a=1~N,N为码长。
(2)接收机通过并行相关运算,将所接到的信号C1(a)与本地序列L(a)作相关,得到相关函数R(a)。将相关函数R(a)取绝对值,找到其中的最大值记为P(1)。
(3)接收机采集一个整周期的CCSK信号C2(a),该信号与之前接收到的一周期信号之间并非同步的周期性关系,而是与前一周期信号间存在一个相位差。所述的相位差为t个码片宽度时间,t小于或等于0.5个码片。
(4)重复步骤(2)、(3),得到相关函数绝对值的最大值,记为P(2)。
(5)重复步骤(4)、(5) M次,直至M*t>N,纪录所有的相关函数绝对值的最大值P(i)称为峰值数组,i=1~M。峰值数组是接收机对多组具有相位差的整周期接受数据进行并行相关,对每周期接收数据与本地序列相关运算得出的相关函数取绝对值,该绝对值的最大值则为峰值数组中的一个元素。多组具有相位差的整周期接收数据,其初相覆盖了完整的一个码序列周期。
(6)选取P(i)中的最大值P(x);
(7)接收机以接收信号Cx(a)为基准,以扩频序列的长度为周期接收数据。此时本地序列L和接收序列C实现了同步,即捕获功能完成。
有益效果
本发明的效果和益处是在不依赖导频信道的情况下实现对CCSK信号的捕获。
附图说明
附图 1 是信号处理流程图。
本发明的实施方式
以下结合技术方案(和附图)详细叙述本发明的具体实施方式。
对于一个伪随机序列1023长1ms周期的***。本发明的技术方案以如下步骤进行。
(1)接收机采集1ms的CCSK信号C1(a),a=1~1023;
(2)接收机通过并行相关运算,将所接到的信号C1(a)与本地序列L(a)作相关,得到相关函数R(a)。
(3)将相关函数R(a)取绝对值,找到其中的最大值记为P(1);
(4)接收机采集一个整周期的CCSK信号C2(a),该信号与之前接收到的一周期信号之间并非同步的周期性关系,而是与前一周期信号间存在一个0.5/1023ms的相位差;
(5)重复步骤(2)、(3),得到相关函数绝对值的最大值,记为P(2);
(6)重复步骤(4)、(5) 2046次,纪录所有的相关函数绝对值的最大值P(i)称为峰值数组,i=1~2046;
(7)选取P(i)中的最大值P(x);
(8)接收机以接收信号Cx(a)为基准,以扩频序列的长度为周期接收数据。此时本地序列L和接收序列C实现了同步,即捕获功能完成。
以上所述实施例仅表达本发明的实施方式,但并不能因此而理解为对本发明专利的范围的限制,应当指出,对于本领域的技术人员来说,在不脱离本发明构思的前提下,还可以做出若干变形和改进,这些均属于本发明的保护范围。

Claims (2)

  1. 一种不依赖导频的CCSK信号捕获方法,其特征在于,该方法中接收机对多组具有相位差的整周期接收数据进行并行相关,得出峰值数组;峰值数组中的最大值所对应的接收信号,既是与本地序列同步的信号;具体步骤如下:
    (1)接收机采集一个整周期的CCSK信号C1(a),a=1~N,N为码长;
    (2)接收机通过并行相关运算,将所接到的信号C1(a)与本地序列L(a)作相关,得到相关函数R(a);将相关函数R(a)取绝对值,找到其中的最大值记为P(1);
    (3)接收机采集一个整周期的CCSK信号C2(a),该信号与之前接收到的一周期信号之间并非同步的周期性关系,而是与前一周期信号间存在一个相位差;
    (4)重复步骤(2)、(3),得到相关函数绝对值的最大值,记为P(2);
    (5)重复步骤(4)、(5) M次,直至M*t>N,纪录所有的相关函数绝对值的最大值P(i)称为峰值数组,i=1~M;所述的峰值数组是接收机对多组具有相位差的整周期接受数据进行并行相关,对每周期接收数据与本地序列相关运算得出的相关函数取绝对值,该绝对值的最大值则为峰值数组中的一个元素;多组具有相位差的整周期接收数据,其初相覆盖了完整的一个码序列周期;
    (6)选取P(i)中的最大值P(x);
    (7)接收机以接收信号Cx(a)为基准,以扩频序列的长度为周期接收数据;此时本地序列L和接收序列C实现同步,捕获功能完成。
  2. 根据权利要求1所述的一种不依赖导频的CCSK信号捕获方法,其特征在于,所述的相位差为 t小于或等于0.5个码片。
PCT/CN2019/085440 2018-10-22 2019-05-05 一种不依赖导频的 ccsk 信号捕获方法 WO2020082715A1 (zh)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201811226871.X 2018-10-22
CN201811226871.XA CN109286592A (zh) 2018-10-22 2018-10-22 一种不依赖导频的ccsk信号捕获方法

Publications (1)

Publication Number Publication Date
WO2020082715A1 true WO2020082715A1 (zh) 2020-04-30

Family

ID=65177667

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2019/085440 WO2020082715A1 (zh) 2018-10-22 2019-05-05 一种不依赖导频的 ccsk 信号捕获方法

Country Status (2)

Country Link
CN (1) CN109286592A (zh)
WO (1) WO2020082715A1 (zh)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109286592A (zh) * 2018-10-22 2019-01-29 大连理工大学 一种不依赖导频的ccsk信号捕获方法
CN110336584A (zh) * 2019-06-13 2019-10-15 大连理工大学 基于多周期联合分析的多峰值ccsk信号自同步方法
CN110943747B (zh) * 2019-11-20 2022-03-04 北京无线电计量测试研究所 宽带微波信号捕获方法及***
CN111917435B (zh) * 2020-01-07 2021-10-22 大连理工大学 基于峰值延迟差的多峰码移键控信号同步方法
CN116405055B (zh) * 2023-06-07 2023-08-29 中国人民解放军国防科技大学 一种扩频通信方法、***及相关装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101068115A (zh) * 2007-06-15 2007-11-07 西安华迅微电子有限公司 一种多星座卫星信号的混合串并行相关捕获方法
CN103543456A (zh) * 2013-10-24 2014-01-29 北京大学 一种基于分段相关结合fft运算的大频偏gnss信号捕获方法
US20170272118A1 (en) * 2016-03-16 2017-09-21 Texas Instruments Incorporated Preamble sequence detection of direct sequence spread spectrum (dsss) signals
CN108616323A (zh) * 2018-04-09 2018-10-02 大连理工大学 基于动态多峰组合的ccsk信号改进方法
CN109286592A (zh) * 2018-10-22 2019-01-29 大连理工大学 一种不依赖导频的ccsk信号捕获方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104468451B (zh) * 2014-12-10 2017-10-24 北京理工大学 一种基于变换域通信的多级循环移位键控调制解调方法
CN106453185B (zh) * 2016-08-31 2019-03-29 电子科技大学 一种基于ccsk调制的idma***改进方法
CN107612861B (zh) * 2017-09-06 2023-08-15 成都极比特通信技术有限公司 一种基于ccsk调制的idma***通信方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101068115A (zh) * 2007-06-15 2007-11-07 西安华迅微电子有限公司 一种多星座卫星信号的混合串并行相关捕获方法
CN103543456A (zh) * 2013-10-24 2014-01-29 北京大学 一种基于分段相关结合fft运算的大频偏gnss信号捕获方法
US20170272118A1 (en) * 2016-03-16 2017-09-21 Texas Instruments Incorporated Preamble sequence detection of direct sequence spread spectrum (dsss) signals
CN108616323A (zh) * 2018-04-09 2018-10-02 大连理工大学 基于动态多峰组合的ccsk信号改进方法
CN109286592A (zh) * 2018-10-22 2019-01-29 大连理工大学 一种不依赖导频的ccsk信号捕获方法

Also Published As

Publication number Publication date
CN109286592A (zh) 2019-01-29

Similar Documents

Publication Publication Date Title
WO2020082715A1 (zh) 一种不依赖导频的 ccsk 信号捕获方法
CN1878099B (zh) 用于求得传输信道占用的方法和装置
AU785280B2 (en) Methods and apparatus for identifying asset location in communication networks
US5144641A (en) Spread spectrum communication device
CN104065397B (zh) 实时同步捕获伪码的方法及装置
JP4140521B2 (ja) 復調器
CN109936520B (zh) 一种猝发通信中低复杂度的gmsk解调定时同步方法
CN108702715B (zh) 并发多无线电接收器
CN112187338B (zh) 一种异步码分多址***用两级处理干扰对消***及方法
CN103684521A (zh) 一种扩频水声通信的快速精确同步方法
US9015220B2 (en) Correlation device
CN102664844B (zh) 解调器中码片定时恢复和载波频偏消除的方法
CN101686477B (zh) 采样时钟频率误差检测方法、装置及***
CN110784245B (zh) 一种基于累积功率相关的扩频码同步方法及***
JP4744843B2 (ja) 環境内に空間分散された複数の非同期センサからの信号を同期させる方法および信号を同期させるシステム
CN108900220B (zh) 一种多个用户信号快速同步方法、装置及调制器
CN102790628B (zh) 基于广播定位信号的多径码相位获取方法和装置
CN103647736B (zh) 一种双通信体制水声Modem及其实现方法
CN110336584A (zh) 基于多周期联合分析的多峰值ccsk信号自同步方法
WO2016000372A1 (zh) 序列检测方法、装置及计算机存储介质
EP2272174B1 (en) Apparatus and method for the acquisition of a spreading sequence in aperiodic dsss systems
CN105119630A (zh) 一种扩频数字接收机捕获进跟踪码相位同步电路
KR101497805B1 (ko) 수중 초음파 모뎀을 위한 동기화 장치 및 동기화 방법
JP2999368B2 (ja) 同期装置
CN1178418C (zh) 用来实现wcdma下行链路中多径搜索的方法和装置

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: 19876667

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 19876667

Country of ref document: EP

Kind code of ref document: A1