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WO2018133262A1 - Procédé et système de construction de code bipolaire bidimensionnel avec une zone de corrélation nulle dans le domaine temps/fréquence - Google Patents

Procédé et système de construction de code bipolaire bidimensionnel avec une zone de corrélation nulle dans le domaine temps/fréquence Download PDF

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Publication number
WO2018133262A1
WO2018133262A1 PCT/CN2017/084239 CN2017084239W WO2018133262A1 WO 2018133262 A1 WO2018133262 A1 WO 2018133262A1 CN 2017084239 W CN2017084239 W CN 2017084239W WO 2018133262 A1 WO2018133262 A1 WO 2018133262A1
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sequence
frequency domain
time
correlation zone
zero correlation
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English (en)
Chinese (zh)
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吉建华
欧阳攀
王可
徐铭
张志朋
杨淑雯
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Shenzhen University
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Shenzhen University
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J13/00—Code division multiplex systems
    • H04J13/0007—Code type
    • H04J13/004—Orthogonal
    • H04J13/0048—Walsh
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J13/00—Code division multiplex systems
    • H04J13/0007—Code type
    • H04J13/0055—ZCZ [zero correlation zone]
    • H04J13/007—LAS, i.e. LA, LS and LAS codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J13/00—Code division multiplex systems
    • H04J13/10—Code generation
    • H04J13/12—Generation of orthogonal codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J13/00—Code division multiplex systems
    • H04J13/10—Code generation
    • H04J13/14—Generation of codes with a zero correlation zone
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/005—Optical Code Multiplex
    • H04J14/007—Orthogonal Optical Code Multiplex

Definitions

  • the present invention relates to the field of communication technologies, and in particular, to a method and system for constructing a two-dimensional bipolar code in a zero-correlation region in time/frequency domain.
  • Optical code division multiple access has the characteristics of broadband, security and random instant access, and is one of the best solutions for high-speed local area networks and access networks in the future. According to the degree of freedom, it can be divided into one-dimensional OCDMA system and two-dimensional OCDMA system.
  • the address code of the two-dimensional OCDMA system not only expands in the time domain, but also expands in wavelength, which is called two-dimensional optical orthogonal code.
  • Yin Hongjun et al. constructed a two-dimensional OCFHC/OOC code and a two-dimensional variable weight code with a cross-correlation limit of 1.
  • Li Chuanqi et al. constructed a two-dimensional QPC code with a cross-correlation limit of 1.
  • Lee and Seo use two different one-dimensional OOCs to spread in the time domain and the frequency domain respectively.
  • the constructed two-dimensional optical orthogonal code has a code weight of 3 and a cross-correlation limit of 1.
  • Kwong and Yang use the prime hopping code to control the time domain and the frequency domain.
  • the code length of the constructed two-dimensional optical orthogonal code is prime, and the cross-correlation limit is equal to 1.
  • One-dimensional OOC is a time-domain spreading sequence, and the number of wavelengths is the product of prime numbers.
  • the cross-correlation limit of two-dimensional optical orthogonal codes is equal to 1.
  • E.S. Shivaleela et al. directly constructed a two-dimensional optical orthogonal code using a finite field, and the cross-correlation limit is equal to one.
  • Jen-Hao Tien and Yang et al. constructed a two-dimensional code with cross-correlation limit of 2, which increased the codeword capacity, but increased the multiple access interference between users.
  • S.Kim and K.Yu construct three-dimensional optical orthogonal codes, which are extended in the time domain/frequency domain/space domain (or polarization domain) respectively, and the codeword capacity is greatly increased, but the system implementation is difficult, and related subsequent researches are more less.
  • two-dimensional coherent OCDMA refers to the use of bipolar two-dimensional address codes for spread spectrum coding and optical correlation decoding in a coherent OCDMA system, which has the advantage that the code word capacity is greatly increased.
  • Ye Zhang uses a bipolar m hopping sequence to implement a phase-encoded two-dimensional SSFBG encoder/decoder, a two-dimensional coherent OCDMA system. In two dimensions In a coherent OCDMA system, the codewords between different users are not completely orthogonal, which will lead to multiple access interference.
  • Ji Jianhua et al. constructed a collision-free bipolar hopping code, which can eliminate multiple access interference and beat noise, but the codeword capacity is small (the code weight is equal to the code length), which makes the capacity of the two-dimensional coherent OCDMA system limited.
  • a large-capacity two-dimensional coherent OCDMA system is realized.
  • Ji Jianhua et al. constructed a method and device for forming a two-dimensional optical orthogonal code with zero correlation window, but only suitable for two-dimensional non-coherent OCDMA systems, and the codeword capacity is limited (equal to the effective wavelength of the system).
  • the noise that affects the performance of the entire system mainly includes multiple access interference and beat noise.
  • Multiple access interference is caused by the non-orthogonality of the codewords, which are caused by the squared nature of the photodetector, again depending on the orthogonality of the codewords.
  • the two-dimensional coherent OCDMA system adopts bipolar m hopping sequence, the address code can not be completely orthogonal (the minimum cross-correlation limit is 1), and the cross-correlation property is not ideal, so the system has multiple access interference and beat noise.
  • the multiple access interference and the beat noise become the most important noise, which causes the bit error rate of the two-dimensional coherent OCDMA system to rise sharply, which results in the limitation of the number of access users of the two-dimensional coherent OCDMA.
  • the address codes cannot be completely orthogonal, the two-dimensional coherent OCDMA system has a near-far effect, which requires complicated power control. Therefore, the current two-dimensional coherent OCDMA system is difficult to put into practical use.
  • Ji Ji Jianhua et al. constructed a non-collision zone bipolar hopping code, which can eliminate multiple access interference and beat noise, but the codeword capacity is small (equal to the effective wavelength of the system), making the capacity of the two-dimensional coherent OCDMA system limited. A large-capacity two-dimensional coherent OCDMA system cannot be realized.
  • the invention provides a method for constructing a time/frequency domain zero correlation zone two-dimensional bipolar code, comprising the following steps:
  • m and ZCZ be positive integers, where m represents the number of basic pulses, ZCZ represents the length of the zero correlation zone, and the number of basic pulses is m.
  • the single coincidence sequence is a frequency hopping pseudo random sequence designed for a wireless frequency hopping CDMA system.
  • the number of wavelengths q is an odd integer, defined.
  • the base sequence s of the LA code is a time-spreading pseudo-random sequence
  • the single-coherence sequence is a wavelength hopping pseudo-random sequence
  • the time/frequency domain zero correlation region is formed.
  • the phase of the corresponding chip of the two-dimensional optical orthogonal code of the zero-correlation region in the time/frequency domain is controlled, thereby forming a time/frequency domain.
  • Zero-correlation zone two-dimensional bipolar code according to the polarity of the corresponding chip of the Walsh sequence, the phase of the corresponding chip of the two-dimensional optical orthogonal code of the zero-correlation region in the time/frequency domain is controlled, thereby forming a time/frequency domain.
  • the invention also provides a construction system of a time/frequency domain zero correlation zone two-dimensional bipolar code, comprising:
  • a first constructing module configured to construct a time domain zero correlation zone spreading sequence LA having a zero correlation zone
  • a second construction module for constructing a single coincidence sequence in the frequency domain
  • a first processing module configured to combine a time domain zero correlation zone spreading sequence of a zero correlation zone with a single coincidence sequence of a frequency domain to form a time/frequency domain zero correlation zone two-dimensional optical orthogonal code
  • the second processing module is configured to combine the two-dimensional optical orthogonal code of the time/frequency domain zero correlation zone with the Walsh sequence to form a time/frequency domain zero correlation zone two-dimensional bipolar code.
  • the length ZCZ constructs the base sequence of the LA code, and sets the length of the base sequence to N.
  • the single coincidence sequence is a frequency hopping pseudo-random sequence designed for a wireless frequency hopping CDMA system, and for a given parameter, the number of wavelengths q is an odd integer.
  • the base sequence s of the LA code is a time-spreading pseudo-random sequence
  • the single-coherence sequence is a wavelength hopping pseudo-random sequence, forming a time/frequency domain zero correlation.
  • the phase of the corresponding chip of the two-dimensional optical orthogonal code of the time-correlation region/time domain is controlled, thereby forming a/ Two-dimensional bipolar code in the frequency domain zero correlation zone.
  • the invention has the beneficial effects that: as long as the delay between users is within the zero correlation zone, all codewords are completely orthogonal, which completely eliminates the multiple access interference and beat noise of the two-dimensional coherent OCDMA system, and can also eliminate the second The near-far effect of the dimensional coherent OCDMA system. Therefore, the time/frequency domain zero correlation zone two-dimensional bipolar code constructed by the invention can realize a large-capacity two-dimensional coherent OCDMA system, and is applied to an optical access network, an optical local area network, an optical code label switching network, and an optical fiber sensor network. Wait.
  • Figure 1 is a flow chart of the method of the present invention.
  • the present invention discloses a method for constructing a two-dimensional bipolar code in a time/frequency domain zero correlation zone, which includes the following steps:
  • Step S1 Constructing a time domain zero correlation zone spreading sequence LA having a zero correlation zone
  • Step S2 Constructing a single coincidence sequence of the frequency domain
  • Step S3. Constructing a Walsh sequence
  • Step S4 Combining the time domain zero correlation zone spreading sequence of the zero correlation zone with the single coincidence sequence of the frequency domain to form a time/frequency domain zero correlation zone two-dimensional optical orthogonal code;
  • Step S5. Combining the time/frequency domain zero correlation zone two-dimensional optical orthogonal code with the Walsh sequence, the time/frequency domain zero correlation zone two-dimensional bipolar code is formed.
  • step S1 let m and ZCZ be positive integers, where m represents the number of basic pulses, ZCZ represents the length of the zero correlation zone, and the base sequence of the LA code can be constructed from the basic pulse number m and the zero correlation zone length ZCZ.
  • the distribution positions of the m basic pulses are x1, x2, ..., xm, respectively, and it is assumed that 0 ⁇ x1 ⁇ x2 ⁇ ... ⁇ xm ⁇ N-1.
  • the single coincidence sequence is a frequency hopping pseudo-random sequence designed for a wireless frequency hopping CDMA system.
  • step S3 the second-order Hadamard matrix H2 is:
  • the 2N-order Hadamard matrix H 2N is:
  • step S4 the base sequence s of the LA code is a time-spreading pseudo-random sequence, and the single-coincidence sequence is a wavelength hopping pseudo-random sequence, and the time/frequency domain zero correlation zone two-dimensional optical orthogonal code is constructed.
  • step S5 according to the polarity of the corresponding chip of the Walsh sequence (ie +1 or -1), the phase of the corresponding chip of the two-dimensional optical orthogonal code of the time-correlation region/time domain is controlled, thereby forming a time/frequency domain zero.
  • m ⁇ ⁇ 16,17,18,20,19,22,23,21 ⁇
  • Sequence 1 3,8,1,5,2,10,4,0 Sequence 2 4,9,2,6,3,11,5,1 Sequence 3 5,10,3,7,4,12,6,2 Sequence 4 6,11,4,8,5,0,7,3 Sequence 5 7,12,5,9,6,1,8,4 Sequence 6 8,0,6,10,7,2,9,5 Sequence 7 9,1,7,11,8,3,10,6 Sequence 8 10,2,8,12,9,4,11,7 Sequence 9 11,3,9,0,10,5,12,8 Sequence 10 12,4,10,1,11,6,0,9 Sequence 11 0,5,11,2,12,7,1,10 Sequence 12 1,6,12,3,0,8,2,11
  • step S3 a Walsh sequence of length 8 is constructed with a codeword capacity of 8, i.e., each row of the matrix represents a Walsh code.
  • a two-dimensional optical orthogonal code of the time/frequency domain zero correlation region is constructed from the above LA base sequence s and the single coincidence sequence in Table 1, as shown in Table 2, the code length of the two-dimensional code is 156, The length of the zero correlation zone is 16, the code weight is 8, the effective wavelength is 13, the codeword capacity is 13, the autocorrelation limit is 0, and the cross correlation limit is 1, which can be expressed as (156,16,8,0). ,1).
  • step S5 according to the polarity of the corresponding chip of the Walsh sequence (ie +1 or -1), the phase of the corresponding chip of the two-dimensional optical orthogonal code of the time-correlation region/time domain is controlled, thereby forming a time/frequency domain zero.
  • Correlated 2D bipolar code Taking C13 as an example, each Walsh code is combined with C13 (controls the phase of the corresponding chip) to form two time/frequency domain zero correlation zone two-dimensional bipolar codes, ie
  • any one of the time/frequency domain zero correlation zone two-dimensional optical orthogonal codes in Table 2 can be combined with each Walsh code (control the phase of the corresponding chip), which can constitute 104 time/frequency domain zeros in total.
  • the two-dimensional bipolar code of the relevant area (the codeword capacity of the non-collision zone bipolar hopping code is only 13, and the codeword capacity of the two-dimensional optical orthogonal code of the zero correlation window is only 13). Therefore.
  • the large-capacity time/frequency domain zero correlation zone two-dimensional bipolar code constructed by the invention can realize a large-capacity two-dimensional coherent OCDMA system, and is applied to an optical access network, an optical local area network, an optical code label switching network, and a fiber sensor network. Wait.
  • the invention also discloses a construction system of a time/frequency domain zero correlation zone two-dimensional bipolar code, comprising:
  • a first constructing module configured to construct a time domain zero correlation zone spreading sequence LA having a zero correlation zone
  • a second construction module for constructing a single coincidence sequence in the frequency domain
  • a first processing module configured to combine a time domain zero correlation zone spreading sequence of a zero correlation zone with a single coincidence sequence of a frequency domain to form a time/frequency domain zero correlation zone two-dimensional optical orthogonal code
  • the second processing module is configured to combine the two-dimensional optical orthogonal code of the time/frequency domain zero correlation zone with the Walsh sequence to form a time/frequency domain zero correlation zone two-dimensional bipolar code.
  • m and ZCZ be positive integers, where m represents the number of basic pulses, ZCZ represents the length of the zero correlation zone, and the LA code is constructed from the basic pulse number m and the zero correlation zone length ZCZ.
  • the pulse interval assumes that the distribution positions of the m basic pulses are x1, x2, ..., xm, respectively, and it is assumed that 0 ⁇ x1 ⁇ x2 ⁇ ... ⁇ xm ⁇ N-1.
  • the single coincidence sequence is a frequency hopping pseudo-random sequence designed for a wireless frequency hopping CDMA system.
  • the number of wavelengths q is an odd integer, and the length of the hopping sequence is defined.
  • the base sequence s of the LA code is a time-spreading pseudo-random sequence
  • the single-coincidence sequence is a wavelength hopping pseudo-random sequence
  • the two-dimensional optical orthogonal code of the zero-correlation region in the time/frequency domain is formed.
  • the phase of the corresponding chip of the two-dimensional optical orthogonal code in the zero-correlation region of the time/frequency domain is controlled, thereby forming a time/frequency domain zero correlation region two-dimensionally.
  • Bipolar code according to the polarity of the corresponding chip of the Walsh sequence, the phase of the corresponding chip of the two-dimensional optical orthogonal code in the zero-correlation region of the time/frequency domain is controlled, thereby forming a time/frequency domain zero correlation region two-dimensionally.
  • the method and system for constructing a time/frequency domain zero correlation region two-dimensional bipolar code according to the present invention is different from the traditional two-dimensional optical orthogonal code and different from the traditional one-dimensional time domain zero correlation region spreading sequence. Moreover, the code word capacity is much larger than the existing collision-free area bipolar hopping code. In the present invention, as long as the delay between users is within the zero correlation region, all codewords are completely orthogonal, which will completely eliminate the multiple access interference and beat noise of the two-dimensional coherent OCDMA system, and can also eliminate the near-far effect of the two-dimensional coherent OCDMA system. .
  • the time/frequency domain zero correlation zone two-dimensional bipolar code constructed by the invention can realize a large-capacity two-dimensional coherent OCDMA system, and is applied to an optical access network, an optical local area network, an optical code label switching network, and an optical fiber sensor network. Wait.

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

La présente invention concerne un procédé et un système de construction d'un code bipolaire bidimensionnel avec une zone de corrélation nulle dans le domaine temps/fréquence. Le procédé de construction consiste à : A. construire une séquence d'étalement à zone de corrélation nulle dans le domaine temporel LA ayant une zone de corrélation nulle ; B. construire une séquence à coïncidence unique dans un domaine fréquentiel ; C. construire une séquence de Walsh ; D. combiner la séquence d'étalement à zone de corrélation nulle dans le domaine temporel ayant la zone de corrélation nulle, avec la séquence à coïncidence unique dans le domaine fréquentiel, pour former un code orthogonal optique bidimensionnel avec une zone de corrélation nulle dans le domaine temps/fréquence ; et E. combiner le code orthogonal optique bidimensionnel avec la zone de corrélation nulle dans le domaine temps/fréquence, avec la séquence de Walsh, pour former un code bipolaire bidimensionnel avec une zone de corrélation nulle dans le domaine temps/fréquence. La présente invention est avantageuse en ce qu'elle élimine complètement un brouillage d'accès multiple et un bruit de battement d'un système OCDMA cohérent bidimensionnel, et qu'elle peut également éliminer l'effet proche-lointain du système OCDMA cohérent bidimensionnel. La présente invention peut ainsi réaliser un système OCDMA cohérent bidimensionnel de grande capacité applicable à un réseau d'accès optique, à un réseau local optique, à un réseau à commutation par étiquette de code optique, à un réseau de capteurs à fibre optique, et similaires.
PCT/CN2017/084239 2017-01-20 2017-05-12 Procédé et système de construction de code bipolaire bidimensionnel avec une zone de corrélation nulle dans le domaine temps/fréquence Ceased WO2018133262A1 (fr)

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