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检索条件"主题词=adaptive modulation and coding"

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A QoS-aware and adaptive Soft Frequency Reuse Scheme for Interference Coordination in MMN 14

A QoS-aware and Adaptive Soft Frequency Reuse Scheme for Int...

引用

IEEE International Conference on Computer and Information Technology (CIT 2014)

作者： Wang, Yuanshuang Wang, Xia Shi, Jun Xi An Jiao Tong Univ Sch Elect & Informat Engn Xian Shaanxi Peoples R China

ISBN: (纸本)9781479962396

This paper proposes an adaptive soft frequency reuse (ASFR) scheme for inter-cell interference coordination in mobile multimedia networks (MMN). We first set up the resource allocation model of MMN within LTE framework. adaptive modulation and coding (AMC) and maximum throughput (MT) algorithm are employed to complete the system model among 19 cells. Then we design the intra-cell handover mechanism in terms of different quality of service (QoS) requirements to implement ASFR and only limited information needs to be exchanged within a base station. The proposed scheme can adaptively vary the spectrum and power allocation of major and minor subcarriers for each cell according to traffic loads. Simulation results show that the adaptive scheme can obtain a better tradeoff between system throughput and cell coverage compared with conventional SFR schemes.

关键词： soft frequency reuse adaptive modulation and coding maximum throughput interference coordination

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Frequency Semi-Selective Scheduling for a DFT-SOFDM based Uplink

Frequency Semi-Selective Scheduling for a DFT-SOFDM based Up...

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68th IEEE Vehicular Technology Conference

作者： Krishnamoorthy, A. Sartori, P. J. Baum, K. L. Nangia, V. Classon, B. Motorola Labs Schaumburg IL USA

ISBN: (纸本)9781424417223;9781424417216

This paper describes a scheduling technique for the DFT-SOFDM (SC-FDMA) based uplink of the 3GPP LTE standard. Traditionally, scheduling has been either Frequency-Selective (FS), or Frequency Non Selective (FNS). FS scheduling assigns a user to a portion of the channel bandwidth having high channel-quality. At low mobility, FS typically performs much better than FNS, but at the cost of increased channel-quality feedback overhead. A new class of scheduling methods, called Frequency Semi-Selective (FSS) is introduced, and is shown to perform nearly as well as pure FS scheduling, but with reduced feedback overhead. The technique only requires minimum tracking of the channel and one-bit of additional feedback over FNS techniques.

关键词： DFT-SOFDM SC-FDMA frequency selective scheduling link adaptation adaptive modulation and coding

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Throughput Analysis of Best-m Feedback in OFDM Systems with Uniformly Correlated Subchannels

Throughput Analysis of Best-<i>m</i> Feedback in OFDM System...

引用

20th National Conference on Communications (NCC)

作者： Ananya, S. N. Mehta, Neelesh B. Indian Inst Sci IISc Dept Elect Commun Engn Bangalore Karnataka India

ISBN: (纸本)9781479923618

Practical orthogonal frequency division multiplexing (OFDM) systems, such as Long Term Evolution (LTE), exploit multi-user diversity using very limited feedback. The best-m feedback scheme is one such limited feedback scheme, in which users report only the gains of their m best subchannels (SCs) and their indices. While the scheme has been extensively studied and adopted in standards such as LTE, an analysis of its throughput for the practically important case in which the SCs are correlated has received less attention. We derive new closed-form expressions for the throughput when the SC gains of a user are uniformly correlated. We analyze the performance of the greedy but unfair frequency-domain scheduler and the fair round-robin scheduler for the general case in which the users see statistically non-identical SCs. An asymptotic analysis is then developed to gain further insights. The analysis and extensive numerical results bring out how correlation reduces throughput.

关键词： Orthogonal frequency division multiplexing (OFDM) Correlation Channel quality feedback Best-m Frequency-domain scheduling adaptive modulation and coding

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An Ecological Model for User Population Dynamics in Cognitive Radio Networks

An Ecological Model for User Population Dynamics in Cognitiv...

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IEEE Wireless Communications and Networking Conference (WCNC)

作者： Walingo, Tom Waza, Lulihoshi

ISBN: (纸本)9781538676462

Understanding the population and capacity dynamics of users in a cognitive radio (CR) system is important for planning their coexistence, sharing resources, network stability and achieving spectral efficiency. Rich analytical models are required for planning CR systems. The interaction among different classes of primary users and secondary users sharing the radio spectrum is analogous to the interaction among different species coexisting in an ecosystem. Therefore, this work employs ecological models based on the differential Lotka-Volterra equations to determine the population dynamics, interactions and spectrum management of the different users in a CR system employing adaptive modulation and coding (AMC). The performance dynamics of the system are investigated in terms of the transient behavior, the number of species and system stability.

关键词： adaptive modulation and coding Cognitive radio Lotka-Volterra Resource utilization Wireless channel

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Performance optimization for uplink transmission in IEEE 802.16e BWA networks

Performance optimization for uplink transmission in IEEE 802...

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5th IEEE Consumer Communications and Networking Conference

作者： Qin, Zhongbin Kuo, Geng-Sheng Beijing Univ Posts & Telecommun Natl Key Lab Networking & Switching Beijing 100088 Peoples R China Natl Chengchi Univ Taipei Taiwan

ISBN: (纸本)9781424414567

This paper proposes an efficient approach to optimize the performance of uplink transmission in IEEE 802.16e BWA networks. First, an enhanced bandwidth request (BR) scheme is designed, which takes all uplink nrtPS/BE connections in the same subscriber station (SS) or a rtPS/ErtPS connection as a unit to request bandwidth, as well as defines unicast polling index to indicate whether a SS needs to be polled. This approach reduces the BR delay and the signaling overhead caused by the BR scheme in IEEE 802.16e. Meanwhile, through cross-layer optimization, a joint bandwidth allocation (BA) and packet scheduling scheme is proposed to balance the tradeoff between QoS provision and system throughput under effective admission control. The theoretical analyses and the simulation results show that our approach achieves significant improvements in QoS provision, BR signaling overhead, and system throughput.

关键词： bandwidth request bandwidth allocation IEEE 802.16e adaptive modulation and coding cross-layer design

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A amendatory LRP channel condition prediction algorithm base on Kalman Filtering 6

A amendatory LRP channel condition prediction algorithm base...

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6th International Conference on Computing, Communication and Networking Technologies (ICCCNT)

作者： Yang Xiaojin Pan Jinjin Guilin Univ Aerosp Technol Dept Elect Engn Guilin Peoples R China Guilin Univ Aerosp Technol Dept Informat Engn Guilin Peoples R China

ISBN: (纸本)9781479979837

This paper presents a channel condition prediction method for channel stage changes caused by the mobile move in high speed, which base on Kalman Filtering and Auto Regressive (AR) model. We introduced the selection of the sample and the revision of Kalman after studied traditional solution of LRP algorithms. Next, we extract the data from samples, established the AR model coefficient by a training sequence as the past information, predict the channel condition by the LRP channel prediction, and introduce a decision-making, when channel states have clear changes, revision them by Kalman filter. The algorithm we advanced can avoid the repeating calculation by use LRP algorithm. We found that it obtain the good effect in channel prediction by simulation analysis.

关键词： Wireless Communication Channel Prediction Channel Model adaptive modulation and coding

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An adaptive Algorithm for Joint Data Detection and Channel Estimation for Meteor Burst Communications Based on Per-Survivor Processing 58

An Adaptive Algorithm for Joint Data Detection and Channel E...

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IEEE Global Telecommunications Conference (GLOBECOM)

作者： Li, Zan Chen, Xiaojun Li, Yuquan Beaulieu, Norman C. Obaidat, Mohammad S. Xidian Univ State Key Lab Integrated Serv Networks Xian 710071 Peoples R China China Elect Syst Engn Corp Beijing Beijing Peoples R China Beijing Univ Posts & Telecommun Sch Informat & Commun Engn Beijing Peoples R China Fordham Univ Dept Comp & Informat Sci New York NY 10023 USA

ISBN: (纸本)9781479959525

For meteor burst communications (MBC), although per-survivor processing (PSP) based on joint data and channel estimation provides superior performance and robustness for meteor burst communications (MBC), great computational complexity constrains its application in practice. On this occasion, a dimension-down PSP (D-PSP) algorithm and a adaptive state reduction of PSP (ASRP) algorithm are proposed to curve this problem in this paper. On the basis of this, the adaptive state reduction using a dimension-down PSP (ADPSP) is proposed to combine the advantages of D-PSP and ASRP, which reduces the computational time and memory size for exponentially decaying meteor burst channels and makes maximum likelihood sequence detection (MLSD) possible for adaptive data transmission. Simulation results are presented to validate the theoretical analysis. It is shown that deploying the proposed ADPSP algorithm can achieve a good tradeoff between performance and computational complexity dynamically, and provide reliable data transmission for MBC systems with adaptive coding and modulation.

关键词： adaptive modulation and coding MBC MLSD per-survivor processing

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LDPC coded AMC based on decoding iteration times for OFDM systems

LDPC coded AMC based on decoding iteration times for OFDM sy...

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67th IEEE Vehicular Technology Conference

作者： Li Lihua Zhou Mingyu Xu Yongtai Wang Haifeng Zhang Ping Beijing Univ Posts & Telecommun Wireless Technol Innovat Inst Minist Educ Key Lab Universal Wireless Commun Beijing 100088 Peoples R China Nokia Technol Platform Shanghai Peoples R China

ISBN: (纸本)9781424416448

A low-density parity-check (LDPC) coded adaptive modulation and coding (AMC) strategy is presented for orthogonal frequency division multiplexing (OFDM) systems. Since system performance is improved as the maximum iteration times for LDPC decoding increase, iteration times for decoding reflect channel quality. We first propose an AMC strategy to utilize the information of iteration times for decoding to adopt higher order modulation and coding schemes (MCS) than the conventional strategy, so as to improve system throughput. Since it may bring worse reliability, hybrid automatic repeat request (H-ARQ) is used in a second strategy. Simulation under typical urban channel is carried out, and the results show the proposed strategies can bring higher throughput, and the strategy with H-ARQ can improve throughput and guarantee reliable transmission simultaneously.

关键词： adaptive modulation and coding low density parity check hybrid automatic repeat request maximum iteration times for decoding orthogonal frequency division multiplexing

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PERFORMANCE MODELING AND ANALYSIS OF THE INTERPLAY AMONG TCP, ACTIVE QUEUE MANAGEMENT AND WIRELESS LINK ADAPTATION

PERFORMANCE MODELING AND ANALYSIS OF THE INTERPLAY AMONG TCP...

引用

作者： Onur Ozturk Bilkent University

学位级别：博士

We propose a novel workload-dependent queuing model of a wireless router link which employs active queue management and is offered with a number of per- sistent TCP flows. As opposed to existing work that focus only on the average queue occupancy as the performance metric of interest, the proposed analytical method obtains the more informative steady-state queue occupancy distribution of the wireless link. With the intention of maximizing TCP throughput, this analytical method is used to study traffic agnostic link adaptation schemes with and without hybrid ARQ. Moreover, a novel cross-layer queue-aware link adaptation scheme is proposed to improve the TCP throughput relative to the case where adaptive modulation and coding decisions are made based solely on the physical layer parameters. A fixed-point analytical model is proposed to obtain the aggregate TCP throughput attained at wireless links employing active queue management and queue-aware link adaptation. Allowing packet retransmissions and generalizing the scope from a single link to a network of such links, we propose an energy efficient queue-aware link adaptation scheme with hybrid ARQ which jointly adapts the transmission power and rate of the wireless links based on the queue occupancy levels and the channel conditions. Furthermore, we provide a fixed-point analytical method for such networks.

关键词： Link Adaptation adaptive modulation and coding Wireless Networks TCP Cross-layer Queuing Analysis Queue Awareness Active Queue Management

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Performance enhancement of TCP over adaptive multi-rate IEEE 802.11 wireless LANs

Performance enhancement of TCP over adaptive multi-rate IEEE...

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IEEE Radio and Wireless Symposium

作者： Kashibuchi, Kenichi Taleb, Tarik Jamalipour, Abbas Nemoto, Yoshiaki Kato, Nei Tohoku Univ Grad Sch Informat Sci Sendai Miyagi 9808579 Japan Univ Sydney Sch Elect & Informat Engn Sydney NSW 2006 Australia

ISBN: (纸本)9781424414628

This paper presents a new TCP window size adjustment scheme for the automatic rate fallback (ARF) algorithm. The proposed scheme utilizes the information about radio usage monitored on the IEEE 802.11 MAC layer. Each station calculates the maximum available window size on each long-lived connection based on these information when the data transmission/reception rate is switched, and limits the maximum sending window size.

关键词： adaptive modulation and coding cross-layer design transmission control protocol wireless LAN

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