A ternary zero-correlation zone sequence sets construction procedure

Addad, Mouad; Djebbari, Ali

doi:10.3906/elk-1603-115

Cited by 10 publications

(5 citation statements)

References 21 publications

(43 reference statements)

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“…They correlate with themselves only at a single point in time and enable accurate distance measurement to a target object. The shortest sequences have a length (pulse count) of 7 (see [ 15 , 16 ]). Furthermore, with pseudobinary random sequences, multiple echoes can be distinguished.…”

Section: Methodsmentioning

confidence: 99%

Brachialis Pulse Wave Measurements with Ultra-Wide Band and Continuous Wave Radar, Photoplethysmography and Ultrasonic Doppler Sensors

Hellbrück

Ardelt

Wegerich

et al. 2020

Sensors

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The measurement and analysis of the arterial pulse wave provides information about the state of vascular health. When measuring blood pressure according to Riva-Rocci, the systolic and diastolic blood pressure is measured non-invasively with an inflatable pressure cuff on the upper arm. Today’s blood pressure monitors analyze the pulse wave in reference to the rising or falling cuff pressure. With the help of additional pulse wave analysis, one can determine the pulse rate and the heart rate variability. In this paper, we investigated the concept, the construction, and the limitations of ultrawideband (UWB) radar and continuous wave (CW) radar, which provide continuous and non-invasive pulse wave measurements. We integrated the sensors into a complete measurement system. We measured the pulse wave of the cuff pressure, the radar sensor (both UWB and CW), the optical sensor, and ultrasonic Doppler as a reference. We discussed the results and the sensor characteristics. The main conclusion was that the resolution of the pulse radar was too low, even with a maximum bandwidth of 10 GHz, to measure pulse waves reliably. The continuous wave radar provides promising results for a phantom if adjusted properly with phase shifts and frequency. In the future, we intend to develop a CW radar solution with frequency adaption.

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Section: Methodsmentioning

confidence: 99%

Brachialis Pulse Wave Measurements with Ultra-Wide Band and Continuous Wave Radar, Photoplethysmography and Ultrasonic Doppler Sensors

Hellbrück

Ardelt

Wegerich

et al. 2020

Sensors

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show abstract

“…Due to their zero-correlation property, ZCZ codes have been extensively studied for radio frequency systems (more details can be found in [9], [10]). In [8], the authors introduced optical ZCZ codes to eliminate MAI in an optical QS-CDMA VLC system.…”

Section: Comparison Between Zcc and Zcz Codesmentioning

confidence: 99%

A New Code Family for QS-CDMA Visible Light Communication Systems

Addad¹,

Djebbari²

2018

JTIT

Self Cite

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Visible light communication (VLC) is a promising technology for wireless communication networks. Optical code division multiple access (OCDMA) is a strong candidate for VLC-based applications. The predominant source of bit error in OCDMA is the multiple access interference (MAI). To eliminate MAI in synchronous OCDMA, zero cross correlation (ZCC) codes have been proposed. However, synchronization problems and multipath propagation introduce relative non-zero time delays. Therefore, the zero correlation zone (ZCZ) concept was introduced. In this paper, we propose a new method for generating ZCC codes. The proposed construction can accommodate any number of users with ﬂexible Hamming weight. The numerical results obtained show that the proposed codes signiﬁcantly reduce MAI, compared to ZCC, as well as ZCZ codes.

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“…With-out any loss of generality, we divide both sides of Eq. (9) by 2P N . The desired symbol b i,0 is influenced by the corresponding b k,0 and previous symbols b k,−1 of each interferer k, thus the interference between users at the access point or multiple access interference MAI i term is given by [17]:…”

Section: Preliminariesmentioning

confidence: 99%

“…Each sequence set has specific ACF and CCF properties. ZCZ sequences have been proposed and studied in [9]- [13]. The objective of this paper is to investigate the performance of ZCZ sequences based on two criteria: PAPR and bit error rate (BER) in an MC-CDMA system.…”

Section: Introductionmentioning

confidence: 99%

Suitable Spreading Sequences for Asynchronous MC-CDMA Systems

Addad¹,

Djebbari²

2018

JTIT

Self Cite

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In order to meet the demand of high data rate transmission with good quality maintained, the multi-carrier code division multiple access (MC-CDMA) technology is considered for the next generation wireless communication systems. However, their high crest factor (CF) is one of the major drawbacks of multi-carrier transmission systems. Thus, CF reduction is one of the most important research areas in MC-CDMA systems. In addition, asynchronous MC-CDMA suﬀers from the eﬀect of multiple access interference (MAI), caused by all users active in the system. Degradation of the system’s bit error rate (BER) caused by MAI must be taken into consideration as well. The aim of this paper is to provide a comparative study on the enhancement of performance of an MC-CDMA system. The spreading sequences used in CDMA play an important role in CF and interference reduction. Hence, spreading sequences should be selected to simultaneously ensure low CF and low BER values. Therefore, the eﬀect that correlation properties of sequences exert on CF values is investigated in this study. Furthermore, a numerical BER evaluation, as a function of the signal-to-noise ratio (SNR) and the number of users, is provided. The results obtained indicate that a trade-oﬀ between the two criteria is necessary to ensure good performance. It was concluded that zero correlation zone (ZCZ) sequences are the most suitable spreading sequences as far as the satisfaction of the above criteria is concerned.

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A ternary zero-correlation zone sequence sets construction procedure

Cited by 10 publications

References 21 publications

Brachialis Pulse Wave Measurements with Ultra-Wide Band and Continuous Wave Radar, Photoplethysmography and Ultrasonic Doppler Sensors

Brachialis Pulse Wave Measurements with Ultra-Wide Band and Continuous Wave Radar, Photoplethysmography and Ultrasonic Doppler Sensors

A New Code Family for QS-CDMA Visible Light Communication Systems

Suitable Spreading Sequences for Asynchronous MC-CDMA Systems

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