• Title/Summary/Keyword: efficient throughput

Search Result 709, Processing Time 0.033 seconds

Performance Evaluation of Energy Efficient Packet Transmissions for Wi-Fi System (Wi-Fi 시스템을 위한 에너지 효율적 패킷 전송 방법의 성능 평가)

  • Shin, Taehyu;Kim, Jongwoo;Park, Suwon
    • The Journal of The Korea Institute of Intelligent Transport Systems
    • /
    • v.13 no.3
    • /
    • pp.38-46
    • /
    • 2014
  • Wi-Fi STAs in power saving mode described in the Wi-Fi specification can deteriorate the system performance such as throughput, time delay when they receive data frames from a Wi-Fi AP. This problem is caused by data frame reception failure due to the channel state, and it increases re-transmissions. In this paper, we propose a modified power saving mode of Wi-Fi system in order to solve the problem. Also, we evaluate its performance in terms of throughput and time delay by simulation.

Hardware Design with Efficient Pipelining for High-throughput AES (높은 처리량을 가지는 AES를 위한 효율적인 파이프라인을 적용한 하드웨어 설계)

  • Antwi, Alexander O.A;Ryoo, Kwangki
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
    • /
    • 2017.10a
    • /
    • pp.578-580
    • /
    • 2017
  • IoT technology poses a lot of security threats. Various algorithms are thus employed in ensuring security of transactions between IoT devices. Advanced Encryption Standard (AES) has gained huge popularity among many other symmetric key algorithms due to its robustness till date. This paper presents a hardware based implementation of the AES algorithm. We present a four-stage pipelined architecture of the encryption and key generation. This method allowed a total plain text size of 512 bits to be encrypted in 46 cycles. The proposed hardware design achieved a maximum frequency of 1.18GHz yielding a throughput of 13Gbps and 800MHz yielding a throughput of 8.9Gbps on the 65nm and 180nm processes respectively.

  • PDF

Adaptive Radio Resource Allocation for a Mobile Packet Service in Multibeam Satellite Systems

  • Lim, Kwang-Jae;Kim, Soo-Young;Lee, Ho-Jin
    • ETRI Journal
    • /
    • v.27 no.1
    • /
    • pp.43-52
    • /
    • 2005
  • In this paper, we introduce an adaptive radio resource allocation for IP-based mobile satellite services. We also present a synchronous multibeam CDMA satellite system using an orthogonal resource sharing mechanism among downlink beams for the adaptive packet transmission. The simulation results, using a Ka-band mobile satellite channel and various packet scheduling schemes, show that the proposed system and resource allocation scheme improves the beam throughput by more than two times over conventional systems. The simulation results also show that, in multibeam satellite systems, a system-level adaptation to a user's channel and interference conditions according to user locations and current packet traffic is more efficient in terms of throughput improvement than a user-level adaptation.

  • PDF

High Throughput Parallel Decoding Method for H.264/AVC CAVLC

  • Yeo, Dong-Hoon;Shin, Hyun-Chul
    • ETRI Journal
    • /
    • v.31 no.5
    • /
    • pp.510-517
    • /
    • 2009
  • A high throughput parallel decoding method is developed for context-based adaptive variable length codes. In this paper, several new design ideas are devised and implemented for scalable parallel processing, a reduction in area, and a reduction in power requirements. First, simplified logical operations instead of memory lookups are used for parallel processing. Second, the codes are grouped based on their lengths for efficient logical operation. Third, up to M bits of the input stream can be analyzed simultaneously. For comparison, we designed a logical-operation-based parallel decoder for M=8 and a conventional parallel decoder. High-speed parallel decoding becomes possible with our method. In addition, for similar decoding rates (1.57 codes/cycle for M=8), our new approach uses 46% less chip area than the conventional method.

Effective Transmission Method using Energy Efficient Adaptive Modulation (에너지 효율과 적응변조를 이용한 이동통신 시스템의 효율적인 데이터 전송방법)

  • Oh, Eyu-Kyo
    • Journal of Digital Convergence
    • /
    • v.10 no.9
    • /
    • pp.369-374
    • /
    • 2012
  • In this paper, the effective transmission method is proposed to save the energy and to increase the throughput of the communication system using adaptive modulation. Traditionally, adaptive modulation has been used to improve the throughput using the power margin of the system design. Considering the instantaneous energy during the modulation method changing duration, the effective transmission method is proposed. By the simulation, the performance and effectiveness is validated.

Performance Evaluation of a New Cooperative MAC Protocol with a Helper Node Selection Scheme in Ad Hoc Networks

  • Jang, Jaeshin
    • Journal of information and communication convergence engineering
    • /
    • v.12 no.4
    • /
    • pp.199-207
    • /
    • 2014
  • A new cooperative MAC protocol called the busy tone cooperative medium access control (BT-COMAC) protocol is proposed to overcome the drawbacks and maximize the advantages of existing schemes. This scheme uses a new metric called decibel power to decide an appropriate helper node. Using received power strength is more efficient in selecting an appropriate helper node, especially in a densely populated network, than the effective transmission rates used in conventional schemes. All communication nodes in a communication service area are assumed to move independently. Two performance metrics are used: System throughput and channel access delay. A performance evaluation of the BT-COMAC protocol is conducted using a computer simulation over a slow fading wireless channel, and its performance results are compared with those of four existing schemes. The numerical results show that the BT-COMAC protocol improves the system throughput by approximately 15% as compared to the best existing scheme.

Performance Evaluation of a New AODV Protocol with Auxiliary Metrics

  • Ngo, Van-Vuong;Jang, Jaeshin
    • Journal of information and communication convergence engineering
    • /
    • v.14 no.1
    • /
    • pp.14-20
    • /
    • 2016
  • The AODV protocol uses many RREQ messages and one RREP message in the path-discovery process. This protocol has only one metric, the number of hops. Although it is simple, this protocol is not efficient. To avoid this problem, we propose a new AODV with two auxiliary metrics (AuM-2-AODV). The AuM-2-AODV protocol tries multiple route replies, which reduces the chance of path failure and helps the network obtain a better data rate. It has two auxiliary metrics, the remaining energy of its nodes and the number of HELLO messages received at the nodes. With these two metrics, the reliable path from the source node to the destination node will be chosen. In this paper, the performance of the AuM-2-AODV is evaluated using the NS-3 simulator. The performance results show that AuM-2-AODV provides greater throughput and packet delivery ratio by 20% and up to 50% and about 100% in some cases, respectively, than previous protocols.

Utilization of functionalized magnetic nanoparticles for high throughput DNA separation

  • Jang, Jeong-Ho
    • Proceedings of the Materials Research Society of Korea Conference
    • /
    • 2009.11a
    • /
    • pp.12.2-12.2
    • /
    • 2009
  • The work describes anoptimized process to highly efficient and convenient preparation in highthroughput magnetic human DNA separation with chemically functionalizedsilica-coated magnetic nanoparticles. The effect of nanoparticle's size and the surface's hydrophilicity change were studied for magnetic DNA separation process, inwhich the optimum efficiency was explored via the function of the amino-groupnumbers, particle size, the amount of the nanoparticles used, and theconcentration of NaCl salt. The DNA adsorption yields were high in terms of theamount of triamino-functionalized nanoparticles used, and the average particlesize was 25 nm. The adsorption efficiency of aminofunctionalized nanoparticleswas the 4-5 times (80-100%) higher compared to silica-coated nanoparticles only(10-20%). DNA desorption efficiency showed an optimum level of over 0.7 M ofthe NaCl concentration. To elucidate the agglomeration of nanoparticles afterelectrostatic interaction, the Guinier plots were calculated from small angleX-ray diffractions in a comparison of the results of electron diffraction TEM,and confocal laser scanning microscopy. Additionally, the direct separation ofhuman genomic DNA was achieved from human saliva and whole blood with highefficiency.

  • PDF

A Database System for High-Throughput Transposon Display Analyses of Rice

  • Inoue, Etsuko;Yoshihiro, Takuya;Kawaji, Hideya;Horibata, Akira;Nakagawa, Masaru
    • Proceedings of the Korean Society for Bioinformatics Conference
    • /
    • 2005.09a
    • /
    • pp.15-20
    • /
    • 2005
  • We developed a database system to enable efficient and high-throughput transposon analyses in rice. We grow large-scale mutant series of rice by taking advantage of an active MITE transposon mPing, and apply the transposon display method to them to study correlation between genotypes and phenotypes. But the analytical phase, in which we find mutation spots from waveform data called fragment profiles, involves several problems from a viewpoint of labor amount, data management, and reliability of the result. As a solution, our database system manages all the analytical data throughout the experiments, and provides several functions and well designed web interfaces to perform overall analyses reliably and efficiently.

  • PDF

An Efficient Throughput Improvement through Bandwidth Awareness in Cognitive Radio Networks

  • Le, Tung Thanh;Kim, Dong-Seong
    • Journal of Communications and Networks
    • /
    • v.16 no.2
    • /
    • pp.146-154
    • /
    • 2014
  • This paper proposes a bandwidth-aware localized-routing algorithm that is capable of sensing the available spectrum bands within a two-hop neighboring for choosing the highly opportunistic routes. A mixed-integer linear programming (MILP) is utilized to formulate the optimization problem. Then, the proposed algorithm is used to determine the maximum bandwidth possible of link pairs via a bandwidth approximation process of relaxed variables. Thereby, the proposed algorithm can allow selected routes corresponding to maximum bandwidth possible between cognitive radio (CR) users through link pairs in cognitive radio networks. By comparing the solution values to previous works, simulation results demonstrate that the proposed algorithm can offer a closed-optimal solution for routing performance in cognitive radio networks. The contribution of this paper is achieved through approximately 50% throughput utilized in the network.