Cost-Effective Upstream Scheme for the Next-Generation PON Based on Interleaved Frequency-Division Multiple Access

2012 ◽  
Vol 24 (9) ◽  
pp. 784-786 ◽  
Author(s):  
Hui Yang ◽  
Juhao Li ◽  
Bangjiang Lin ◽  
Song Jiang ◽  
Yongqi He ◽  
...  
Keyword(s):  
Multiple Access ◽  
Cost Effective ◽  
Frequency Division ◽  
Next Generation

Study of Power Control in CDMA System on the basis of optimization Technique

2017 ◽  
Vol 7 (8) ◽  
pp. 126
Author(s):  
. Geetanjli
Keyword(s):  
Power Control ◽  
Multiple Access ◽  
Optimization Technique ◽  
System Optimization ◽  
Base Station ◽  
Particle Swarm Algorithm ◽  
Cdma System ◽  
Frequency Division ◽  
Cdma Systems ◽  
Time Division

The power control in CDMA systems, grant numerous users to share resources of the system uniformly between each other, leading to expand capacity. With convenient power control, capacity of CDMA system is immense in contrast of frequency division multiple access (FDMA) and time division multiple access (TDMA). If power control is not achieved numerous problems such as the near-far effect will start to monopolize and consequently will reduce the capacity of the CDMA system. However, when the power control in CDMA systems is implemented, it allows numerous users to share resources of the system uniformly between themselves, leading to increased capacity For power control in CDMA system optimization algorithms i.e. genetic algorithm & particle swarm algorithm can be used which regulate a convenient power vector. These power vector or power levels are dogged at the base station and announce to mobile units to alter their transmitting power in accordance to these levels. The performances of the algorithms are inspected through both analysis and computer simulations, and compared with well-known algorithms from the literature.

scholarly journals Analysis of Dual-Band Direction of Arrival Estimation in Multipath Scenarios

Electronics ◽  
2021 ◽  
Vol 10 (11) ◽  
pp. 1236
Author(s):  
Alessandro Cidronali ◽  
Edoardo Ciervo ◽  
Giovanni Collodi ◽  
Stefano Maddio ◽  
Marco Passafiume ◽  
...  
Keyword(s):  
Multiple Access ◽  
Direction Of Arrival ◽  
Doa Estimation ◽  
Dual Band ◽  
Second Step ◽  
Frequency Division ◽  
Simulation Environment ◽  
Full Wave ◽  
Wide Range ◽  
Localization Systems

The present paper analyzes the performance of localization systems, based on dual-band Direction of Arrival (DoA) approach, in multi-path affected scenarios. The implemented DoA estimation, which belongs to the so-called Space and Frequency Division Multiple Access (SFDMA) technique, takes advantage of the use of two uncorrelated communication carrier frequencies, as already demonstrated by the authors. Starting from these results, this paper provides, first, the methodology followed to describe the localization system in the proposed simulation environment, and, as a second step, describes how multi-path effects may be taken into account through a set of full-wave simulations. The latter follows an approach based on the two-ray model. The validation of the proposed approach is demonstrated by simulations over a wide range of virtual scenarios. The analysis of the results highlights the ability of the proposed approach to describe multi-path effects and confirms enhancements in DoA estimation as experimentally evaluated by the same authors. To further assess the performance of the aforementioned simulation environment, a comparison between simulated and measured results was carried out, confirming the capability to predict DoA performance.

scholarly journals Is NOMA Efficient in Multi-Antenna Networks? A Critical Look at Next Generation Multiple Access Techniques

2021 ◽  
pp. 1-1
Author(s):  
Bruno Clerckx ◽  
Yijie Mao ◽  
Robert Schober ◽  
Eduard Jorswieck ◽  
David J. Love ◽  
...  
Keyword(s):  
Multiple Access ◽  
Next Generation

Indoor MIMO VLC systems using optical orthogonal frequency division multiple access

2021 ◽  
Vol 485 ◽  
pp. 126728
Author(s):  
Jie Lian ◽  
Yan Gao ◽  
Peng Wu ◽  
Guolei Zhu ◽  
Yingmin Wang
Keyword(s):  
Multiple Access ◽  
Frequency Division

scholarly journals Next-generation sequencing in the clinical genetic screening of patients with pheochromocytoma and paraganglioma

2013 ◽  
Vol 2 (2) ◽  
pp. 104-111 ◽  
Author(s):  
Joakim Crona ◽  
Alberto Delgado Verdugo ◽  
Dan Granberg ◽  
Staffan Welin ◽  
Peter Stålberg ◽  
...  
Keyword(s):  
Next Generation Sequencing ◽  
Genetic Screening ◽  
Bioinformatics Analysis ◽  
Cost Effective ◽  
Susceptibility Genes ◽  
Next Generation ◽  
Clinical Genetic ◽  
Cost Effective Method ◽  
Agilent Sureselect ◽  
Generation Sequencing

BackgroundRecent findings have shown that up to 60% of pheochromocytomas (PCCs) and paragangliomas (PGLs) are caused by germline or somatic mutations in one of the 11 hitherto known susceptibility genes: SDHA, SDHB, SDHC, SDHD, SDHAF2, VHL, HIF2A (EPAS1), RET, NF1, TMEM127 and MAX. This list of genes is constantly growing and the 11 genes together consist of 144 exons. A genetic screening test is extensively time consuming and expensive. Hence, we introduce next-generation sequencing (NGS) as a time-efficient and cost-effective alternative.MethodsTumour lesions from three patients with apparently sporadic PCC were subjected to whole exome sequencing utilizing Agilent Sureselect target enrichment system and Illumina Hi seq platform. Bioinformatics analysis was performed in-house using commercially available software. Variants in PCC and PGL susceptibility genes were identified.ResultsWe have identified 16 unique genetic variants in PCC susceptibility loci in three different PCC, spending less than a 30-min hands-on, in-house time. Two patients had one unique variant each that was classified as probably and possibly pathogenic: NF1 Arg304Ter and RET Tyr791Phe. The RET variant was verified by Sanger sequencing.ConclusionsNGS can serve as a fast and cost-effective method in the clinical genetic screening of PCC. The bioinformatics analysis may be performed without expert skills. We identified process optimization, characterization of unknown variants and determination of additive effects of multiple variants as key issues to be addressed by future studies.

Sign in / Sign up

Export Citation Format

Share Document