• Title, Summary, Keyword: throughput enhancement

Search Result 118, Processing Time 0.033 seconds

A New Asymptotic Analysis of Throughput Enhancement from Selection Diversity in Multiuser Systems (다중 사용자 다이버시티로부터 얻게 되는 처리율 증가에 대한 새로운 근사적 분석)

  • Seo, Woo-Hyun;Kim, Sung-Tea;Kwak, Kyung-Chul;Hong, Dae-Sik
    • The Journal of Korean Institute of Communications and Information Sciences
    • /
    • v.32 no.11C
    • /
    • pp.1111-1118
    • /
    • 2007
  • This paper presents our study of throughput enhancement achieved by selection diversity in a multiuser system, called multiuser diversity (MUDiv), using a new asymptotic approach. The MUDiv gain is evaluated by deriving an asymptotic formula for the throughput enhancement from the MUDiv gain as a simple closed form introducing a Puiseux series. The formula shows that the MUDiv gain is independent of the signal-to-noise ratio (SNR). This concept can be extended to analysis applicable to scheduling algorithms, such as Max C/I and proportional fair scheduling. The MUDiv gain throughput analysis is verified using Monte-Carlo simulations.

Packet Scheduling Algorithms for Throughput Fairness and Coverage Enhancement in TDD-OFDMA Downlink Network (TDD-OFDMA 하향 링크에서의 수율 공평성과 서비스 커버리지 보장을 위한 패킷 스케줄링 알고리즘 연구)

  • Ki, Young-Min;Kim, Dong-Ku
    • The Journal of Korean Institute of Communications and Information Sciences
    • /
    • v.30 no.7A
    • /
    • pp.611-619
    • /
    • 2005
  • The present paper proposes two different packet scheduling algorithms in the IEEE 802.16e type TDD-OFDMA downlink, which are the weighted fair scheduling(WFS) and the throughput guarantee scheduling(TGS). The performance of proposed scheduling algorithms are compared to some of conventional schedulers such as round robin(RR), proportional fair(PF), fast fair throughput(FFTH), and fair throughput(FH) in terms of service coverage, effective throughput and fairness at 64 kbps and 128 kbps minimum user throughput requirements. For a relatively smaller throughput(64 kbps) requirement, the proposed algorithms provide higher improvement in the number of users per sector within 95$\%$ service coverage while satisfying the lxEV-DV fairness criterion. For a relatively larger throughput(128 kbps) requirement, the proposed algorithms provide higher coverage enhancement while maintaining the same effective aggregate throughput over PF scheduler.

Design on Main Mechanism of High Throughput Device for Enhancement of Oxidation and Recover Rate (산화속도 및 회수율 향상을 위한 고효율 장치 핵심 메커니즘 설계)

  • Kim, Y.H.;Park, B.S.;Jung, J.H.;Yoon, J.S.;Hwang, J.S.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
    • /
    • /
    • pp.473-476
    • /
    • 2008
  • In this paper, we designed the main mechanism of high throughput device for rod-cuts of spent fuel. For this, we analyzed the mechanical methods(slitting, ball mill, roller straightening) and chemical methods(muffle furnace, rotary kiln). As the results, methods of ball drop and rotary drum for concepts design were selected in the analysis step. For enhancement of oxidation rate, we devised the blades on the reactor with mesh type. Also, for enhancement of decladding rate, we designed ball size and rotation reactor with mesh type and devised the vacuum system for fission products. Mechanisms of oxidation and recovery can simultaneously handle the rod-cuts of spent fuel and independently recover. The results of mechanism design can be used for scale-up of high throughput device.

  • PDF

VLSI design of a shared multibuffer ATM Switch for throughput enhancement in multicast environments (멀티캐스트 환경에서 향상된 처리율을 갖는 공유 다중 버퍼 ATM스위치의 VLSI 설계)

  • Lee, Jong-Ick;Lee, Moon-Key
    • Proceedings of the IEEK Conference
    • /
    • /
    • pp.383-386
    • /
    • 2001
  • This paper presents a novel multicast architecture for shared multibuffer ATM switch, which is tailored for throughput enhancement in multicast environments. The address queues for multicast cells are separated from those for unicast cells to arbitrate multicast cells independently from unicast cells. Three read cycles are carried out during each cell slot and multicast cells have chances to be read from shared buffer memory(SBM) in the third read cycle provided that the shared memory is not accessed to read a unicast cell. In this architecture, maximum two cells are queued at each fabric output port per time slot and output mask choose only one cell. Extensive simulations are carried out and it shows that the proposed architecture has enhanced throughput comparing with other multicast schemes in shared multibuffer switch architecture.

  • PDF

An Optimal Relay Selection and Adaptive Throughput Enhancement Scheme Utilizing Superposition Modulation (협력 통신에서 중첩 변조를 활용한 최적의 중계단 선정 및 적응적 전송률 향상 기법)

  • Kang, Sung-jin
    • The Journal of Korean Institute of Communications and Information Sciences
    • /
    • v.40 no.10
    • /
    • pp.1934-1936
    • /
    • 2015
  • This paper proposes an optimal relay selection and adaptive throughput enhancement scheme utilizing superposition modulation in cooperative communication. The optimal relay is selected and the channel state is estimated by utilizing superposition modulation. The source determines the number of superimposed signal in accordance with the estated channel state. As a result, throughput is increased in accordance with the channel state.

RRM Optimization for the Throughput Enhancement of WiFi AP (WiFi AP 성능 향상을 위한 무선 자원 관리 최적화)

  • Jeong, Kil Hyun
    • Journal of the Korea Society of Computer and Information
    • /
    • v.17 no.12
    • /
    • pp.131-136
    • /
    • 2012
  • In these days, with the diffusion of mobile equipments, the number of WiFi Access Point (AP) is increasing, and the growth of WiFi AP causes the throughput degradation due to interferences between APs. This recent phenomenon demands the method able to be utilized with current WiFi network to improve the throughput of Wireless LANs. This paper studied the channel assignment method and several throughput enhancement methods to optimize Radio Resource Management (RRM) for distributed infrastructure WLANs. As a result, it was able to put AP independently, improve older allocation error, and improve execution speed.

A Study on Dynamic Bandwidth Allocation Mechanism for an Enhancement of E-PON's Upstream Throughput (E-PON의 상향 대역전송 성능 향상을 위한 동적대역할당 메커니즘 연구)

  • Lee, Dong-Yeal;Oh, Seung-Hyeub
    • The Journal of Korean Institute of Communications and Information Sciences
    • /
    • v.32 no.8B
    • /
    • pp.547-552
    • /
    • 2007
  • IEEE ratified IEEE802.3ah as the standard of E-PON, while it leaved the specific method of upstream bandwidth allocation as a role of implementation vendors. Many experts have researched the method of enhancing upstream bandwidth throughput and released related papers. This paper presents another novel mechanism to enhance upstream throughput. This mechanism performs the management of upstream queues by giving the minimum bandwidth of different level to each queue. In order to process packets on each queue we adopted a modified weighted DRR technology. By doing so, the transmission throughput of upstream packets can be largely enhanced. The experimental simulation of this mechanism showed an enhancement of bandwidth utilization more than 10% in comparison to legacy method.

A Wireless TCP Protocol for Throughput Enhancement in Wireless Broadband (휴대 인터넷에서 처리율 향상을 위한 Wireless TCP 프로토콜)

  • Moon, Il-Young
    • Proceedings of the KIEE Conference
    • /
    • /
    • pp.57-59
    • /
    • 2006
  • In this paper, we investigate the wireless TCP protocol for throughput improvement in wireless Broadband. If the burst error duration of a wireless link is significantly long, retransmissions of lost packets by Snoop TCP are fulfilled mainly not by the receipt of duplicate acknowledgement (DUPACKs) but by local timer expiration. With the proposed scheme, Snoop TCP recovers packet losses fast by shortening the interval of local retransmissions based on the channel status. From the simulation results, we can show that the proposed scheme can improve TCP throughput considerably.

  • PDF

MAC Enhancement by Utilizing Multiple Channels in IEEE 802.15.3 High-Rate Wireless Personal Area Networks (IEEE 802.15.3 Wireless PAN의 MAC에서 다중채널의 적용)

  • Lee Byung-Joo;Rhee Seung Hyong;Choi WoongChul;Chung Kwangsue;Lee Jang-Yeol;Cho Jin-Woong
    • The Journal of Korean Institute of Communications and Information Sciences
    • /
    • v.30 no.8A
    • /
    • pp.656-663
    • /
    • 2005
  • This paper presents a multi-channel enhancement scheme for the MAC protocol of IEEE 802.15.3 High-rate WPAN (Wireless Personal Area Network). The current MAC protocol of the IEEE 802.15.3 High-rate WPAN is designed for sharing a single channel among DEVs of a piconet; that is, within a single piconet, PNC prevents interference through MAC layer assignment of time slots to other DEVs using time-division multiple access. When the number of DEVs that communicate with each other frequently, is increased in a single WPAN, the size of the superframe becomes inevitably large, and this may result in a significant throughput drop or a failure to provide QoS guarantee. A multi-channel enhancement scheme for the MAC protocol of IEEE 802.15.3 High-rate WPAN is proposed to significantly increase the aguegate throughput and more reliably provide the QoS guarantees in a piconet

Optimal Frame Length Control for Throughput Enhancement in Cognitive Radio Systems (인지 무선 시스템에서 전송률 향상을 위한 최적의 프레임 길이 제어 방법)

  • Noh, Go-San;Bang, Keuk-Joon;Hong, Dae-Sik
    • Journal of the Institute of Electronics Engineers of Korea TC
    • /
    • v.49 no.2
    • /
    • pp.1-8
    • /
    • 2012
  • We propose a new frame length control scheme for cognitive radio systems. In the proposed algorithm, the property that the probability of a primary packet arrival continually increases as time elapses during the primary user's idle period is utilized. When reducing the secondary frame length in accordance with the increasing primary packet arrival probability, spectrum sensing is conducted more frequently as time elapses and the primary packet arrival is detected more quickly. We obtain the optimal frame lengths by maximizing the secondary throughput while satisfying the interference constraint. Numerical results show a significant throughput enhancement via the frame length control.