EP1844564A1 - Procede pour codes de diffusion entrelaces - Google Patents

Procede pour codes de diffusion entrelaces

Info

Publication number
EP1844564A1
EP1844564A1 EP05712654A EP05712654A EP1844564A1 EP 1844564 A1 EP1844564 A1 EP 1844564A1 EP 05712654 A EP05712654 A EP 05712654A EP 05712654 A EP05712654 A EP 05712654A EP 1844564 A1 EP1844564 A1 EP 1844564A1
Authority
EP
European Patent Office
Prior art keywords
series
barker
interwoven
spreading code
signal
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.)
Withdrawn
Application number
EP05712654A
Other languages
German (de)
English (en)
Inventor
Dani Alon
Meir Gazit
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.)
Vishay Intertechnology Inc
Original Assignee
Vishay Intertechnology Inc
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 Vishay Intertechnology Inc filed Critical Vishay Intertechnology Inc
Publication of EP1844564A1 publication Critical patent/EP1844564A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J13/00—Code division multiplex systems
    • H04J13/16—Code allocation

Definitions

  • TITLE METHOD FOR INTERWOVEN SPREADING CODES
  • the present invention relates to interwoven spreading codes such as Barker codes which are used in pulse compression or pulse encoding, such as may be used in direct sequence spread spectrum communications.
  • Barker codes which are used in pulse compression or pulse encoding, such as may be used in direct sequence spread spectrum communications.
  • the present invention is discussed primarily in the context of direct sequence spread spectrum signals, the present invention is not to be limited to this specific context as Barker codes and other spreading codes can be used in other contexts, especially in applications relating to high noise low signal environments.
  • Barker codes can be used in other contexts, especially in applications relating to high noise low signal environments.
  • Barker codes can be used for spreading.
  • Barker codes are used in pulse compression, or pulse coding. Barker codes can be used to compare two signals resulting in a maximum output if the two signals match and either a zero or a constant minimum value in other cases. This comparison process is generally called correlation. One bit of each input line is examined at a time, these bits are multiplied and the individual results are added. Barker codes are not the only type of code that is used for spreading, as other spreading codes are used. Despite these advantages, problems remain. One of the most significant problems with using Barker codes is the uneven envelope of the pulses when a limited bandwidth is required. This uneven envelope allows less energy per pulse to be transmitted, thus reducing the sensitivity of the receiver. Therefore, it is a primary object, feature, or advantage of the present invention to improve upon the state of the art.
  • a further object, feature, or advantage of the present invention is to provide a code that provides substantially the same autocorrelation properties as those associated with a Barker code.
  • the present invention provides for the creation of and use of interwoven spreading codes.
  • a method of communication involves combining an interwoven spreading code, such as a Barker code with digital data to produce a signal and then sending the signal.
  • the interwoven spreading code is formed from a stretched spreading code series at a first frequency and a mirror of the stretched spreading code series at a second frequency.
  • digital data is extracted from a signal that contains data encoded through use of interwoven spreading codes.
  • the spreading code used is a Barker code, however other spreading codes with suitable auto correlation properties can also be used.
  • Figure 1 is a graph illustrating autocorrelation of a Barker 13 series, a stretched Barker 13 series or its mirror, and autocorrelation of the sum of a stretched series with its mirror (interwoven Barker series).
  • Figure 2 is a graph illustrating a comparison between a simulated Barker 13 and an
  • Interwoven Barker 13 transmitted signal and the differences in uniformity of the amplitude.
  • Figure 3 illustrates the measured transmitted signal of an Interwoven Barker 13 code showing a uniform envelope.
  • Figure 4 illustrates the power spectrum of the Interwoven Barker 13 code.
  • Figure 5 illustrates the autocorrelation signal of the Interwoven Barker 13 code as measured.
  • Figure 6 illustrates one embodiment of a transmitter adapted for use of Interwoven Barker codes.
  • Figure 7 illustrates one embodiment of a receiver adapted for use of Interwoven Barker codes.
  • Figure 8 illustrates one embodiment of deriving interwoven Barker codes of the present invention.
  • the present invention provides for use of interwoven spreading codes and methods of using these codes in communication systems.
  • the present invention is not to be limited to the specific embodiments described herein.
  • a Barker code is used.
  • the present invention contemplates, however, that other types of spreading codes can be used, especially those that provide desirable auto correlation properties.
  • By studying the relationship between a Barker series and its mirror image, the present inventors have observed that the two series alternately build each other and destroy each other.
  • a Barker 13 series is used, although any Barker series can be used.
  • Barker 13 series 1 -1 1 -1 1 1 -1 -1 1 1 1 1 1 sum: 2 0 2 0 2 0 -2 0 2 0 2 0 2 0 2 0 2 .
  • the sum of the two series emphasizes this fact as for each digit either alternating twos or zeros result.
  • the alternating twos indicate build-up while the zeros indicate destruction.
  • the resulting two vectors are indifferent to each other; when the stretched Barker
  • the new series is created, by convolution of the Barker 13 series with the vector [0.5,0.5]. This mathematical operation guarantees that the autocorrelation obtained by these series will not be significantly altered. In addition, the bandwidth of the signal will be narrowed as its duration increases.
  • Figures 1 and 2 illustrate some of the useful properties of Interwoven Barker codes.
  • the autocorrelation of a Barker 13 series is indicated by series A.
  • the autocorrelation of a stretched Barker 13 series or its mirror is indicated by series B.
  • the autocorrelation of the sum of the stretched Barker 13 series with its mirror is indicated by series C.
  • the autocorrelation of the Interwoven Barker 13 series C is substantially the same as for the Barker 13 series A, thus this advantage of Barker series is maintained.
  • Figure 2 illustrates one of the useful advantages of the Interwoven Barker Code, hi particular, Figure 2 illustrates that the Interwoven Barker Code provides a more uniform amplitude than a Barker 13 series. The uniform amplitude of the Interwoven Barker code allows more energy per pulse to be generated.
  • the Interwoven Barker codes including the Interwoven Barker 13 code can be implemented using SAW (surface acoustic wave) technology, such as that disclosed in U. S. Patent No. 6,535,545, herein incorporated by reference in its entirety, hi one embodiment of the present invention each of the two interwoven series can be encoded using BPSK (bi-phase sequence keying) at a separate frequency.
  • BPSK bi-phase sequence keying
  • the first series can be set at 482 MHz and the second series can be set at 494 MHz.
  • the resulting signal was transmitted and observed on an oscilloscope.
  • the PA (pulse amplitude) compression envelope was observed to become more uniform than predicted by simulation. This is illustrated in Figure 3.
  • the spectrum of the resulting Interwoven Barker 13 code was also observed in Figure 4. Note that the center frequency is set at 2.438 GHz and the signal has a relatively limited bandwidth.
  • Figure 5 illustrates the autocorrelation signal of the Interwoven Barker 13 code which is consistent with the simulated autocorrelation
  • FIG. 6 illustrates a block diagram of one embodiment of a transmitter using an Interwoven Barker Code. As shown in Figure 6. Incoming digital data bits are combined (such as through use of an XOR function) with a stretched Barker series and a mirrored stretched Barker series. The resulting signal is modulated by a modulator 12 to produce a signal for transmission. In Figure 7, a receiver 20 is shown. A received signal is input to a demodulator 22.
  • Interwoven Barker codes of the present invention can be used in any number of hardware and/or software implementations of devices.
  • the present invention contemplations numerous other embodiments and variations.
  • the present invention provides for using spreading codes of various types, including Barker codes or other spreading codes recognized as providing effective auto correlation signals, when summed with their mirror image.
  • the present invention contemplates interwoven spreading codes of different lengths, the present invention contemplates using interwoven spreading codes in applications other than spread spectrum digital communications, differences in the type of modulation used, the frequencies used, and other differences and variations which would be apparent to one skilled in the art having the benefit of this disclosure. These and other variations are all within the spirit and scope of the invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Optical Communication System (AREA)

Abstract

Selon l'invention, un code de diffusion entrelacé est formé par une série de codes de diffusion étendue, à une première fréquence et un miroir de la série de codes de diffusion étendue, à une seconde fréquence. Le code de diffusion entrelacé peut s'utiliser pour diffuser un signal de bande de base. Des données peuvent être récupérées par corrélation d'un signal reçu avec le code de diffusion entrelacé. Le code de diffusion utilisé lors de la formation du code de diffusion entrelacé peut être un code de Barker.
EP05712654A 2005-02-03 2005-02-03 Procede pour codes de diffusion entrelaces Withdrawn EP1844564A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US2005/003285 WO2006083248A1 (fr) 2005-02-03 2005-02-03 Procede pour codes de diffusion entrelaces

Publications (1)

Publication Number Publication Date
EP1844564A1 true EP1844564A1 (fr) 2007-10-17

Family

ID=34979987

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05712654A Withdrawn EP1844564A1 (fr) 2005-02-03 2005-02-03 Procede pour codes de diffusion entrelaces

Country Status (4)

Country Link
EP (1) EP1844564A1 (fr)
JP (1) JP4558046B2 (fr)
CN (1) CN101133583B (fr)
WO (1) WO2006083248A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2521961C2 (ru) * 2010-01-08 2014-07-10 Фудзицу Лимитед Устройство генерирования кодов, устройство генерирования опорных сигналов и соответствующие способы

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110635863B (zh) * 2018-06-21 2021-06-01 华为技术有限公司 发送调制符号的方法、接收调制符号的方法和通信设备

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4568915A (en) * 1983-11-14 1986-02-04 The United States Of America As Represented By The Secretary Of The Army Code generator for multilevel interleaved multiplexed noise codes
US5077753A (en) * 1990-04-09 1991-12-31 Proxim, Inc. Radio communication system using spread spectrum techniques
US6134264A (en) * 1995-02-01 2000-10-17 Hitachi, Ltd. Spread spectrum communication device and communication system
KR19990016606A (ko) * 1997-08-18 1999-03-15 윤종용 씨디엠에이 이동통신시스템의 의사직교부호를 이용한 대역확산신호 발생장치 및 방법

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2006083248A1 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2521961C2 (ru) * 2010-01-08 2014-07-10 Фудзицу Лимитед Устройство генерирования кодов, устройство генерирования опорных сигналов и соответствующие способы
RU2557786C1 (ru) * 2010-01-08 2015-07-27 Фудзицу Лимитед Устройство генерирования кодов, устройство генерирования опорных сигналов и соответствующие способы
RU2560718C1 (ru) * 2010-01-08 2015-08-20 Фудзицу Лимитед Устройство генерирования кодов, устройство генерирования опорных сигналов и соответствующие способы

Also Published As

Publication number Publication date
CN101133583B (zh) 2011-10-05
JP4558046B2 (ja) 2010-10-06
WO2006083248A1 (fr) 2006-08-10
CN101133583A (zh) 2008-02-27
JP2008529449A (ja) 2008-07-31

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