scholarly journals Constructions of optimal low hit zone frequency hopping sequence sets with large family size

2022 ◽  
Vol 0 (0) ◽  
pp. 0
Author(s):  
Xiujie Zhang ◽  
Xianhua Niu ◽  
Xin Tan
Keyword(s):  
Family Size ◽  
Multiple Access ◽  
Large Family ◽  
Multiple Access Interference ◽  
Frequency Hopping ◽  
Practical Applications ◽  
Large Family Size ◽  
Frequency Hopping Sequence ◽  
Low Hit Zone ◽  
Multiple Access System

<p style='text-indent:20px;'>Frequency hopping sequences with low hit zone is significant for application in quasi synchronous multiple-access systems. In this paper, we obtained two constructions of optimal frequency hopping sequence sets with low hit zone based on interleaving techniques. The presented low hit zone frequency hopping sequence sets are with new and flexible parameters and large family size which can meet the needs of the practical applications. Moreover, all the sequences in the proposed sets are cyclically inequivalent. Some low hit zone frequency hopping sequence sets constructed in literatures are included in our family. The proposed frequency hopping sequence sets with low hit zone are contributed for quasi-synchronous frequency hopping multiple access system to reduce or eliminate multiple-access interference.</p>

New Constructions of Optimal Frequency-Hopping Sequence Sets with Low-Hit-Zone

2016 ◽  
Vol 27 (01) ◽  
pp. 53-66 ◽  
Author(s):  
Changyuan Wang ◽  
Daiyuan Peng ◽  
Limengnan Zhou
Keyword(s):  
Multiple Access ◽  
Chinese Remainder Theorem ◽  
Discrete Logarithm ◽  
Multiple Access Interference ◽  
Frequency Hopping ◽  
Optimal Frequency ◽  
Frequency Hopping Sequence ◽  
Low Hit Zone ◽  
Logarithm Function

The frequency-hopping sequence set with low-hit-zone (LHZ FHS set) is useful for eliminating multiple-access interference in quasi-synchronous frequency-hopping multiple access systems. In this paper, basing on Cyclotomy, the discrete logarithm function and the Chinese remainder theorem, we construct two classes of LHZ FHS sets which have new parameters not covered in the literature. It is proved that proposed LHZ FHS sets are optimal respectively with respect to the Peng-Fan-Lee bounds.

scholarly journals Low-Hit-Zone Frequency/Time Hopping Sequence Sets With Large Family Size

IEEE Access ◽  
2019 ◽  
Vol 7 ◽  
pp. 181733-181739 ◽  
Author(s):  
Xing Liu ◽  
Qin Shu ◽  
Qi Zeng
Keyword(s):  
Family Size ◽  
Large Family ◽  
Time Hopping ◽  
Large Family Size ◽  
Low Hit Zone

Performance Analysis of Spectral Amplitude Coding Optical Code Division Multiple Access System using Modified Double Weight Codes with Adomian Decomposition Method

2018 ◽  
Vol 39 (4) ◽  
pp. 459-462 ◽  
Author(s):  
Monika Rani ◽  
Harbax Singh Bhatti ◽  
Vikramjeet Singh
Keyword(s):  
Code Division Multiple Access ◽  
Multiple Access ◽  
Decomposition Method ◽  
Adomian Decomposition Method ◽  
Multiple Access Interference ◽  
Spectral Amplitude ◽  
Adomian Decomposition ◽  
Spectral Amplitude Coding ◽  
Code Division Multiple ◽  
Multiple Access System

Abstract In this manuscript, we have analyzed a Spectral Amplitude Coding-Optical Code Division Multiple Access (SAC-OCDMA) System. The system performance is enhanced by reducing the effect of Multiple Access Interference (MAI) using uniform Fiber Bragg Gratings (FBGs) encoders and decoders at central office and subscriber’s end. The results are verified through a mathematical model and Modified Double Weight (MDW) codes for the proposed system using Adomian Decomposition Method (ADM). Further, we have demonstrated SAC-OCDMA system for transmission of 40 Gbps data rate up to a distance of 80 km by increasing the number of FBGs. The proposed system has been analyzed in terms of distance, bit error rate (BER) and Quality Factor.

Socioeconomic Factors in Adolescent Delinquency

1985 ◽  
Vol 28 (1) ◽  
pp. 21-29 ◽  
Author(s):  
N.D. Jejurikar ◽  
N.S. Shenvi
Keyword(s):  
Juvenile Delinquency ◽  
Socioeconomic Factors ◽  
Family Size ◽  
Nuclear Family ◽  
Large Family ◽  
Adolescent Delinquency ◽  
Sexual Offences ◽  
Large Family Size ◽  
Family Pattern ◽  
Delinquent Boys

[In Bombay, 371 delinquent boys and girls were interviewed in order to study the various socioeconomic factors. In the majority of the cases, an adverse home environ ment played a major role. 45% of the boys and 50% of the girls had incurred loss of one or both the parents. Factors like poverty, large family size, nuclear family pattern and illiteracy had a great bearing in causing aberrant behaviour in these children. Involvement in sexual offences in the form of elopement and/or rape were observed in girls. In boys, stealing was a major reason for being in the observation home. 70% of the delinquents did not belong to proper Bombay. With rapid urbanisation, the problem of juvenile delinquency is bound to increase manifold in the next few decades}.

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