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

共 320 条记录，以下是51-60 订阅

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Analysis of an adaptive modulation and coding Scheme with HARQ for TCP Traffic 14

Analysis of an Adaptive Modulation and Coding Scheme with HA...

引用

Wireless Telecommunications Symposium (WTS)

作者： Ozturk, Onur Akar, Nail Bilkent Univ Dept Elect & Elect Engn TR-06800 Ankara Turkey

ISBN: (纸本)9781479967766

In this paper, we analyze the aggregate TCP throughput performance of a wireless link utilizing Active Queue Management (AQM) and an adaptive modulation and coding (AMC) scheme with Hybrid ARQ (HARQ) based on the probability of failure in the first transmission attempt. We assume packets arriving out-of-order at the wireless receiver due to random retransmissions are resequenced before being released to the network. For this reason, an approximate model for the delay experienced at the resequencing buffer is also presented. In the light of the results obtained from the presented analysis, we propose a threshold for the aforementioned probability of failure making the investigated AMC scheme work at an overall performance close to that of the optimum policy.

关键词： TCP adaptive modulation and coding HARQ

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Radio-Efficient adaptive modulation and coding: Green Communication Perspective

Radio-Efficient Adaptive Modulation and Coding: Green Commun...

引用

73rd IEEE Vehicular Technology Conference (VTC Spring)

作者： Zhao, Liqiang Cai, Jian Zhang, Hailin Xidian Univ State Key Lab Integrated Serv Networks Xian Shaanxi Peoples R China

ISBN: (纸本)9781424483310

To lessen the environmental impact of the communication industry, Green Communications has achieved increasing attention from government, academia, and industry. However, how to define a green communication system has been an open topic. In this paper, we carry out a comprehensive analysis of the b/s/Hz bandwidth efficiency, the b/s/Hz/m(2) area spectral efficiency, the b/TENU power efficiency, the b/s/Hz/W power efficiency, and the (b.m)/s/Hz/W green efficiency of a wireless link. After comparing the performance of the green efficiency with the other efficiencies, we present an adaptive modulation and coding scheme to approach the maximum green efficiency, which provides an effective way to Green Communications.

关键词： Green Communications Efficiency adaptive modulation and coding

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Constellation and Rate Selection in adaptive modulation and coding based on Finite Blocklength Analysis

Constellation and Rate Selection in Adaptive Modulation and ...

引用

IEEE Wireless Communications and Networking Conference (WCNC)

作者： Meng, Jin Yang, En-hui Univ Waterloo Dept Elect & Comp Engn Waterloo ON N2L 3G1 Canada

ISBN: (纸本)9781467359399;9781467359382

In this paper, the problem of constellation and rate selection in adaptive modulation and coding according to the channel condition is considered. A new selecting rule based on the finite blocklength analysis of channel capacity is proposed. When applied to the LTE system, the proposed selecting rule reveals interesting, new combinations of constellation and rate which yield significantly better performance in comparison with corresponding combinations suggested in the LTE system.

关键词： Finite blocklength analysis of channel capacity Taylor expansion adaptive modulation and coding throughput LTE

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Multi-Group Wireless Multicast Broadcast Services Using adaptive modulation and coding: Modeling and Analysis

Multi-Group Wireless Multicast Broadcast Services Using Adap...

引用

2010 IEEE 71st Vehicular Technology Conference

作者： Liang, Yu-Cheng Chou, Ching-Chun Wei, Hung-Yu Natl Taiwan Univ Dept Elect Engn Taipei Taiwan

ISBN: (纸本)9781424425198

adaptive modulation and coding (AMC) is attracting research interest in wireless multicast broadcast services (MBS). AMC increases the system throughput by utilizing possible good channel states instead of using robust modulation and coding schemes. A model for the AMC in an MBS system with multiple MBS groups is provided, and stochastic analysis using Markov chain is also applied for modeling analysis. Simulation results show extremely high correspondence to the proposed mathematical model.

关键词： adaptive modulation and coding feedback multicast broadcast service multiple MBS group

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In-line interference mitigation method based on adaptive modulation and coding for satellite system 16

In-line interference mitigation method based on Adaptive mod...

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16th International Conference on Optical Communications and Networks (ICOCN)

作者： Yang, Chen Zhang, Qi Tian, Qinghua Xin, Xiangjun Liu, Bo Zhang, Lijia Shen, Yufei Tao, Ying Chen, Dong Xin, Ning BUPT Sch Elect Engn Xitucheng Rd 10 Beijing 100876 Peoples R China BUPT Beijing Key Lab Space Ground Interconnect & Conve Xitucheng Rd 10 Beijing Peoples R China NUIST Sch Phys & Optoelect Engn Ningliu Rd 219 Nanjing 210044 Jiangsu Peoples R China China Acad Space Technol Friendship Rd 104 Beijing 100094 Peoples R China

ISBN: (纸本)9781538632734

As in-line interference between geostationary(GEO) and Non-Geostationaiy(NGEO) systems is becoming more and more serious. We propose an efficient utilisation of the adaptive modulation and coding (AMC) scheme for spectral coexistence of GEO and NGEO satellites to mitigate in-line interference. Results of Simulation show that the proposed scheme can improve the performance of the NGEO system in comparison with the traditional method of mitigating the co-channel interference.

关键词： Satellite communications In-line interference Interference angle adaptive modulation and coding

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Scalable Video Multicast with Joint Resource Allocation and adaptive modulation and coding over Multiple Base Station Networks 12

Scalable Video Multicast with Joint Resource Allocation and ...

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IEEE 12th International Conference on Networking, Sensing and Control

作者： Li, Jie Bao, Zhongming Zhang, Chenxiang Li, Qiyue Hefei Univ Technol Sch Comp & Informat Hefei Peoples R China Hefei Univ Technol Sch Elect Engn & Automat Hefei Peoples R China

ISBN: (纸本)9781479980697

Video multicast exploits the wireless broadcast nature to transmit a video stream to multiple clients with a minimum bandwidth requirement. Scalable video coding (AMC) and adaptive modulation and coding (AMC) are two key techniques for video multicast in broadband wireless networks. They improve the system utility value by dividing the video steam into different layers and assigning appropriate modulation and coding schemes (MCS) to each layer. With the development of mobile communication, all kinds of multiple access interference technology have been studied profound which make the multi-base station cooperative transmission possible. This paper presents a joint Slot-allocation and MCS-selection scheme in multi-base station system model. We first formulate the problem as maximizing the total system utility, where the utility of each user is a generic non-negative, non-decreasing function of received rate, which can be proven to be a NP-hard optimization problem. Then an intra-session MCS assignment method based on greedy algorithm is proposed, which can be also applied to muti-session scenarios. Simulation results show that our algorithm keeps good performance compared with the optimal result, and outperforms other competing schemes of single-base station system.

关键词： scalable video multicast adaptive modulation and coding multiple base station greedy algorithm

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Research on Threshold Selection Algorithm for adaptive modulation and coding Scheme 6th

Research on Threshold Selection Algorithm for Adaptive Modul...

引用

6th International Conference on Communications, Signal Processing, and Systems (ICCSPS)

作者： Cui, Hao Li, Zhigang Dou, Zheng Harbin Engn Univ Nantong Str 145 Harbin 150001 Heilongjiang Peoples R China

ISBN: (纸本)9789811065712;9789811065705

With the satellite communication as a key technology to achieve global seamless coverage, how to meet the different types of business needs and achieve reliable transmission of information under the conditions of limited resources have become an important issue that we need to face currently. adaptive modulation and coding technology has good link adaptive effect in the satellite mobile communication fading channel. By assessing the merits of the channel state, the sender changes the various parameters of signal dynamically to achieve the purpose of improving system performance in different channel environments. Therefore, in order to make the system have the best adaptive transmission effect, it is necessary to select the most suitable MCS. In this paper, we first discuss the MCS selection algorithm, and simulate in the three different satellite channel environments to determine the thresholds of modulation and coding scheme.

关键词： adaptive modulation and coding SNR Threshold Satellite communication

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Performance of adaptive modulation and coding (AMC) on Multi-carrier CDMA for Mobile Multimedia Transmission

Performance of Adaptive Modulation and Coding (AMC) on Multi...

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IEEE International Symposium on Broadband Multimedia Systems and Broadcasting

作者： Tanaka, Hirokazu Yanasaki, Shoichiro Haseyama, Miki Hokkaido Univ Sch Informat Sci & Technol Sapporo Hokkaido 0600814 Japan Polytech Univ Commun Syst Engn Sagamihara Kanagawa 2291196 Japan Hokkaido Univ Sch Informat Sci & Technol Sapporo Hokkaido 0600814 Japan

ISBN: (纸本)9781424425907

In this paper, we investigate the performance of MC-CDMA with bi-orthogonal keying employing Generalized Symbol-rate-increased (GSRI) Pragmatic adaptive Trellis Coded modulation (ATCM). It is advantageous that the GSRI TC-MPSK can arbitrarily set the bandwidth expansion ratio (coding rate) and higher coding gain than the conventional pragmatic TCM scheme can be obtained. By changing the modulation scheme and the bandwidth expansion ratio, this scheme can optimize the performance according to the channel conditions. The performance evaluations by simulations on an AWGN channel and multi-path fading channels are presented. It is shown that the proposed scheme has remarkable throughput performance than that of the conventional scheme.

关键词： multi-carrier CDMA Reed-Solomon code adaptive modulation and coding trellis coded modulation

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Analysis of the adaptive modulation and coding algorithm with the multicode transmission

Analysis of the adaptive modulation and coding algorithm wit...

引用

56th IEEE Vehicular Technology Conference

作者： Kwan, R Chong, P Rinne, M Nokia Res Ctr FIN-00045 Helsinki Finland

ISBN: (纸本)0780374673

adaptive modulation and coding (AMC) has gained a lot of attention in the research targeting for the standardization of the High Speed Downlink Packet Access (HSDPA) [1]. The idea is to adapt the transmission to-the-fast changing channel conditions by the use of different modulation and coding schemes (MCS). In this paper, an algorithm is presented for the AMC technique in the HSDPA concept with multicode transmission, and the mathematical analysis of this algorithm is given: Furthermore, a scheduling algorithm is introduced-in which the terminal in a queue with the best expected carrier-to-interference ratio (C/I) is selected for the transmission interval. Such maximum C/I scheduling with the AMC and multicode transmission is anticipated to increase the throughput. In this paper, the numerical results of the analysis are compared to the respective results obtained by the simulations.

关键词： WCDMA high speed downlink packet access HSDPA adaptive modulation and coding multicode transmission

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Throughput Performance Of adaptive modulation and coding Schemes for WPAN Transceiver

Throughput Performance Of Adaptive Modulation And Coding Sch...

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International Symposium on Advanced Electrical and Communication Technologies (ISAECT)

作者： Azza, Mohammed Amine El Yahyaoui, Moussa El Moussati, Ali Natl Sch Appl Sci Dept Elect Informat & Telecommun Oujda Morocco

ISBN: (纸本)9781538673287

The main benefit brought by the 60 GHz technology is the high data rates, but it opposes some problems such as inter-symbol interference (ISI), path-loss, and time variant link. To improve the link budget, adaptive modulation and coding (AMC) techniques are utilized. The purpose of this paper is to study the influence of AMC on the High Speed Interface Physical layer (HSI PHY) mode of the IEEE 802.15.3c standard. For this we have created a Simulink model representing the schema of the IEEE 802.15.3c transceiver with an algorithm which allows adaptation in terms of modulation and coding of the transmitter whatever channel. And for testing, we used a 60 GHz channel model based on a lot of measured data and statistical analysis named Triple-S and Valenzuela (TSV) model, in both Line-Of Sight (LOS) and Non-Line-Of-Sight (NLOS) scenarios, added to an optical fiber link of fixed length.

关键词： adaptive modulation and coding 60 GHz

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