A New Class of Binary Zero Correlation Zone Sequence Sets

Fassi, Benattou

doi:10.9790/2834-0531519

Cited by 13 publications

(4 citation statements)

References 8 publications

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“…For both the simulation and the experimental setup, we choose Zero-correlation Zone (ZCZ) sequences [28]- [30], due to their good auto and cross-correlation properties (this also demonstrates the applicability of the proposed method with different code sequences). The construction of ZCZ sequences with a code length of 64 is done according to [30]. Figure 16 illustrates the normalized auto-correlation and cross-correlation of the two selected codes.…”

Section: A Simulationsmentioning

confidence: 99%

Phase-Coded FMCW Automotive Radar: System Design and Interference Mitigation

Uysal

2020

IEEE Trans. Veh. Technol.

102

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A frequency-modulated continuous-wave (FMCW) radar takes advantage of stretch processing (dechirping, deramping) to reduce the sampling requirements of radar systems such as automotive radars. When applying phase coding into FMCW radar systems for interference mitigation or joint communication, preservation of this benefit is not possible, due to the nature of this process. This paper proposes a new phase coded FMCW system as well as a processing strategy based on a groupdelay filter to deal with unaligned phase-coded radar return signals. Moreover, this paper proposes an improved interference mitigation method based on a phase-coded linear-frequencymodulated (LFM) continuous waveform and points out the improvements in the signal-to-interference ratio (SIR). In the proposed mitigation technique, unlike the traditional approach where RF spectrum spreads, the beat frequency spectrum of the FMCW radar spreads, thus the bandwidth of RF hardware stays the same as a classical LFM continuous wave radar. The success of the proposed phase coded frequency-modulated continuous-wave (PC-FMCW) radar is illustrated in simulations and increased interference mitigation performance is validated by experiments.

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Section: A Simulationsmentioning

confidence: 99%

Phase-Coded FMCW Automotive Radar: System Design and Interference Mitigation

Uysal

2020

IEEE Trans. Veh. Technol.

102

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“…The length of a pair sequences are generated as follows: is generated as follows [17]: 1, 1,1,1,1, 1,1, 1, 1, 1,1,1,1, 1,1,1,1,1, 1,1,1, 1,1,1,1,1, 1,1,1, 1 1, 1,1,1,1, 1,1,1,1,1, 1, 1, 1,1, 1,1,1,1, 1,1,1, 1,1, 1, 1, 1,1, 1, 1,1 1, 1,1, 1, 1, 1, 1,1, 1, 1,1, 1, 1, 1,1, 1,1,1,1, 1, 1, 1,1, 1,1,1,1, 1, 1 1, 1,1, 1, 1, 1,1, 1,1,1, 1,1,1,1,1, 1,1,1,1, 1, 1, 1, 1,1, 1, 1, 1,1 1, 1,1, 0, 0, 0, 0,1,1, 1,1, 0, 0, 0, 0, 1, 1, 1,1, 0, 0, 0, 0,1,1, 1,1, 0, 0, 0, 0,1,1,1, 1, 0, 0, 0, 0,1,1, 1,1, 0, 0, 0, 0,1,1,1, 1, 0, 0, 0, 0,1,1, 1,1, 0 1, 1,1, 0, 0, 0, 0,1,1, 1,1, 0, 0, 0, 0,1,1,1, 1, 0, 0, 0, 0, 1,1, 1,1, 0, 0, 0, 0, 1,1,1, 1, 0, 0, 0, 0,1,1, 1,1, 0, 0, 0, 0, 1, 1, 1,1, 0, 0, 0, 0, 1, 1,1, 1, 0 1, 1, 1, 0, 0, 0, 0,1, 1, 1, 1, 0, 0, 0, 0, 1,1, 1, 1, 0, 0, 0, 0,1, 1, 1, 1, 0, 0, 0, 0,1, 1,1,1,1, 0, 0, 0, 0, 1, 1, 1,1, 0, 0, 0, 0, 1,1,11,0,0,0,0, 1, 1, 1,0 1, 1, 1, 0, 0, 0, 0,1, 1, 1, 1, 0, 0, 0, 0,1, 1,1,1, 0, 0, 0, 0, 1,1,1,1, 0, 0, 0, 0, 1, 1,1,1, 0, 0, 0, 0,1, 1, 1, 1, 0, 0, 0, 0, 1,1, 1, 1, 0, 0, 0, 0, 1,1,1,1, 0…”

Section: Proposed Sequence Constructionmentioning

confidence: 99%

“…is optimal or approach optimal binary ZCZ sequences [17]. The length of j T in Equations (14) and 15…”

Section: The Features Of the Proposed Sequencementioning

confidence: 99%

Ternary Zero Correlation Zone Sequence Sets for Asynchronous DS-CDMA

Fassi¹,

Djebbari²,

Taleb‐Ahmed³

2014

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In this paper we propose a new class of ternary Zero Correlation Zone (ZCZ) sequence sets based on binary ZCZ sequence sets construction. It is shown that the proposed ternary ZCZ sequence sets can reach the upper bound on the ZCZ sequences. The performance of the proposed sequences set in asynchronous Direct Sequence-Code Division Multiple Access (DS-CDMA) system is evaluated. In the simulation we used two types of channels: Additive White Gaussian Noise (AWGN) and frequency non-selective fading with AWGN noise. The proposed ternary ZCZ sequence sets show better results, in term of Bit Error Rate (BER), than Hayashi's ternary ZCZ sequence sets.

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“…Each laser would be modulated with a different pseudorandom sequence. No solution appears to exists according some limits (Welch bounds)[50][51] but a solution to study is the use of sequences that have zero cross correlation in a zone of the complete function[51][52].…”

mentioning

confidence: 99%

DSP-based CW lidars for clouds and aerosol

Ardanuy Della

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This thesis aims at exploring the limits of low peak-power, low-cost, all-semiconductor, compact lidars (laser radars) for range-resolved remote sensing of atmospheric aerosols and clouds. The systems investigated are based on laser diodes for emitter, avalanche photodiodes for the receiver, and digital signal processors for processing the returns from the atmosphere and the system control. The studied systems are built on the use of M-sequences and other derivated ones, which allows retrieving range-dependent information from the returning echoes, while having almost the same number of ones and zeros to maximize the transmitted average power for a limited peak power. The use of digital processors to generate the modulating sequences and to process the lidar returns allows for systems with agile reconfiguration capabilities and the use of very long sequences while keeping the processing time virtually negligible compared with the time employed to transmit the laser pulse-modulated output and receive the echoes from the atmosphere (the measuring time). The theorical developments are tested and demonstrated by the experimental results obtained with two lidar prototypes designed and build according the theoretical framework. The detection of cloud bases up to 8km with transmission peak powers of 125 mW in the near (almost visible) infrared (785 nm wavelength), with spatial resolution of 70 to 100 m and time resolution from 30 seconds to 4 minutes, has been achieved. Aerosols at lower altitudes are also observed in conditions of high aerosol load. In addition to further developments in low-cost lidar systems for detections of particles suspended in the atmosphere, the technical developments of this work pave also the way to the design of low-power systems por open path, range-resolved detection of gases, for example in industrial environments. After an introductory chapter, chapter 2 reviews the basic principles of lidar systems and focuses on continuous-wave systems with pseudorandom sequence modulation of the transmitted power and the constraints set by the requirement of a low peak-power transmitter. Chapter 3 reviews different types of power-modulating digital sequences that can be used, with the constraint of average 50% duty cycle, selects the best ones to be investigated in the experimental study, and unravels some of the issues associated to possible non-linear behavior of the photoreceiver. Chapter 4 presents the theoretical performance of the system, which is compared to a model that takes into account the technical constraints and non-idealities of the system building blocks. Chapter 5 sets out the complete design of the prototypes that have been built and tested, which are presented in chapter 6. Chapter 7 presents the tests and field results obtained with the prototypes built according to the design discussed in chapter 5. Chapter 8 presents the conclusions and outlines possible lines opened by the thesis work. Two appendices (chapter 9) develop further details on the detrimental effect of non-linear behavior in the receiver chain, and practical aspects of the alignment procedure between the lidar transmitter and the receiving optics. Aquesta tesi té com a objectiu explorar els límits dels lidars compactes (radars làser) de baixa potència de pic, baix cost, tot basat en semiconductors per a la detecció remota de núvols i aerosols atmosfèrics amb resolució en distància. Els sistemes investigats es basen en díodes làser per a l 'emissor, fotodíodes d'allau per al receptor i processadors digitals de senyal per a processar els retorns atmosfèrics i el control del sistema. Els sistemes estudiats es basen en l'ús de seqüències M i altres de derivades, el que permet recuperar la informació de la distancia dependent dels ecos del retorn, al mateix temps que té gairebé el mateix nombre d'uns i zeros per maximitzar la potència mitjana transmesa amb una potència de pic limitada. L'ús de processadors digitals per generar seqüències de modulació i retorns del lidar permet sistemes amb capacitat de canviar de configuració àgil i l'ús de seqüències molt llargues, mantenint el temps de processament pràcticament insignificant en comparació amb el temps dedicat a transmetre la sortida modulada del pols làser i rebre ecos de l'atmosfera (temps de mesurament). Els desenvolupaments teòrics són provats i demostrats amb resultats experimentals obtinguts amb dos prototips lidar dissenyats i construïts segons el marc teòric. La detecció de base de núvols fins a 8 km s'ha aconseguit amb potències de transmissió de 125 mW de potència en infraroig proper (quasi visible, 785 nm de longitud d'ona), amb resolució espacial de 70 a 100 m i resolució de temps de 30 segons a 4 minuts. Els aerosols en altituds més baixes també s'observen sota condicions de càrregues d'aerosols elevades. A més de nous desenvolupaments en sistemes lidar de baix cost per a la detecció de partícules en suspensió a l'atmosfera, els desenvolupaments tècnics d'aquest treball també preparen el camí per al disseny de sistemes de detecció de gasos de baix consum, amb resolució en distància, per exemple , en entorns industrials. Després d'un capítol introductori, el capítol 2 revisa els principis bàsics dels sistemes lidar i es centra en els sistemes d'ona contínua amb modulació amb seqüència pseudoaleatòries de la potència transmesa i les restriccions establertes per l'exigència d'un transmissor de potència de baixa potència de pic. El capítol 3 comentaris els diferents tipus de seqüències digitals per a la modulació de potència que es poden utilitzar, amb la restricció del cicle mitjà de treball del 50%, selecciona les millors per ser investigades en l'estudi experimental i desentranya alguns dels problemes associats amb el possible comportament no lineal del fotoreceptor. El capítol 4 presenta el rendiment teòric del sistema, que es compara amb un model que té en compte les limitacions tècniques i les no idealitats dels components bàsics del sistema. El capítol 5 estableix el disseny complet dels prototips que s'han construït i provat, que es presenten en el capítol 6. El capítol 7 presenta les proves i els resultats de camp obtinguts amb prototips construïts d'acord amb el disseny discutit en el capítol 5. El capítol 8 presenta les conclusions i s'esbossen possibles línies obertes pel treball de la tesi. Dos apèndixs (capítol 9) desenvolupen més detalls sobre l'efecte perjudicial del comportament no lineal en la cadena receptora i aspectes pràctics del procediment d'alineació entre el transmissor LIDAR i l'òptica receptora.

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A New Class of Binary Zero Correlation Zone Sequence Sets

Cited by 13 publications

References 8 publications

Phase-Coded FMCW Automotive Radar: System Design and Interference Mitigation

Phase-Coded FMCW Automotive Radar: System Design and Interference Mitigation

Ternary Zero Correlation Zone Sequence Sets for Asynchronous DS-CDMA

DSP-based CW lidars for clouds and aerosol

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