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

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Traffic Scheduling for 5G-TSN Integrated Systems

Traffic Scheduling for 5G-TSN Integrated Systems

引用

International Symposium on Wireless Communication Systems (ISWCS)

作者： Yang, Jingwei Yu, Guanding Zhejiang Univ Coll Informat Sci & Elect Engn Hangzhou Peoples R China

ISBN: (数字)9781665455442

ISBN: (纸本)9781665455442

The fourth industrial revolution will significantly improve the level of informatization and intelligence of the industry by building a smart factory. As an essential part of the smart factory, industrial communication systems face rigorous challenges. On the one hand, many smart factory applications demand data delivery with ultra-high reliability within a very low end-to-end latency. On the other hand, new services place high demands on the flexibility and scalability of the communication system. Industry-standard organizations have embarked on research and proposed several potential solutions. The time-sensitive networking (TSN) task group has developed a series of ethernet-based standards to address issues such as time synchronization and traffic scheduling in industrial networks. Additionally, ultra-reliable and low-latency communications (URLLC) are supported by the 5th generation (5G) mobile communications technology. The combination of 5G and TSN technologies as a solution for industrial communication networks has received much attention, and many related studies have been conducted. In this paper, we investigate how to achieve low-latency communication in a 5G-TSN integrated network by considering non-real-time communication services with high throughput requirements. Simulation results demonstrate that the proposed approach performs well in terms of reducing end-to-end latency and improving system throughput.

关键词： Industry 4.0 Time-sensitive networking adaptive modulation and coding Resource allocation

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Channel Characteristic Aware Spectrum Aggregation Algorithm in Cognitive Radio Networks

Channel Characteristic Aware Spectrum Aggregation Algorithm ...

引用

36th Annual IEEE Conference on Local Computer Networks (LCN)

作者： Lin, Jintao Shen, Lianfeng Bao, Nan Su, Bailong Deng, Zhipeng Wang, Dayang Southeast Univ Natl Mobile Commun Res Lab Nanjing Peoples R China

ISBN: (纸本)9781612849287

In Cognitive Radio (CR) networks, it is common that the spectrum holes are too narrow to support high-speed communications. Discontinuous Orthogonal Frequency Division Multiplexing (DOFDM) is a good way for a secondary user to access several spectrum fragments simultaneously with one Radio Front (RF). In this paper, a novel Channel Characteristic Aware Spectrum Aggregation (CCASA) algorithm which uses DOFDM to aggregation spectrum fragments with only one radio front is proposed in order to increase the overall throughput of a CR network. By combining adaptive modulation and coding (AMC) and spectrum aggregation, the good subcarriers are assigned to the specific secondary users in CCASA algorithm thus achieving a better channel efficiency. Different bandwidth requirement and aggregation limitation of secondary users are both considered in this algorithm while maintaining a fairly low computational complexity. The simulation results show that CCASA achieves a bigger total throughput than existing aggregation algorithms.

关键词： adaptive modulation and coding cognitive radio discontinuous OFDM spectrum aggregation

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Link Adaptation Algorithms for Free-Space Optical Communication Systems 13

Link Adaptation Algorithms for Free-Space Optical Communicat...

引用

13th IEEE International Conference on Advanced Networks and Telecommunication Systems (IEEE ANTS)

作者： Hariq, Sayed Hasan Odabasioglu, Niyazi Istanbul Univ Cerrahpasa Dept Elect & Elect Engn Istanbul Turkey

ISBN: (纸本)9781728137155

In this paper, a turbo-coded FSO system with Mary pulse position modulation is considered over log-normal turbulence channels and an adaptive coding and modulation scheme is proposed under peak power constraints. In the proposed system, a link adaptation technique is designed to maximize the bandwidth efficiency of the turbo-coded FSO system by adaptively varying the code rate of turbo code and modulation size according to the channel state information. The simulation results demonstrate significant performance improvements of the proposed adaptive coding and modulation scheme over coded/uncoded adaptive modulation and non-adaptive counterparts.

关键词： Link adaptation turbo codes Free-space optical Communications adaptive modulation and coding

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Performance Analysis on Automated and Average Channel Quality Information (CQI) Reporting Algorithm in LTE-A 6

Performance Analysis on Automated and Average Channel Qualit...

引用

6th International Conference on Computer and Communication Engineering (ICCCE)

作者： Sukor, Masturah Ahamad Ramli, Huda Adibah Mohd IIUM Dept Elect & Comp Engn Kuala Lumpur Malaysia

ISBN: (纸本)9781509024278

Robust service can be achieved in error prone Long Term Evolution-Advanced (LTE-A) by dealing with imperfect Channel Quality Information (CQI). CQI is very crucial in evolved Node B (eNodeB) to decide the corresponding modulation and coding scheme in LTE and LTE-A. User Equipment (UE) will measure and estimate the CQI in order to maximize the throughput performance. adaptive modulation and coding (AMC) is used in order to adapt with the channel variation environments but the wireless channel itself is subject to various impairments including imperfect CQI report which may lead to degradation of the Quality of Service (QoS). The performance of two CQI reporting algorithms which are Automated CQI Reporting Algorithm and Average CQI Reporting Algorithm are being analyzed in this paper. The simulation results demonstrated that the Average CQI Reporting Algorithm produced more promising results with the increment about 15% of the system capacity and capable to support delay up to 63.6% compared to Automated CQI Reporting Algorithm with respect to the Packet Loss Ratio (PLR).

关键词： Long Term Evolution-Advanced adaptive modulation and coding Channel Quality Information reporting algorithms user equipment resource block outdate CQI

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Multicarrier Transmission Design for Wireless Communication in Smart Grid 7

Multicarrier Transmission Design for Wireless Communication ...

引用

2017 7th IEEE International Symposium on Microwave, Antenna, Propagation, and EMC Technologies

作者： Lei Wei Wei Li Guzheng Qin Wei Xu Hua Zhang Information and Telecommunication Branch State Grid Jiangsu Electric Power Company National Mobile Communications Research Lab Southeast University

ISBN: (纸本)9781509059300;9781509059294

Smart grid is the future development direction of power system, but it is difficult for the traditional data radio station to meet the new business needs. In this study, a wireless communication system combining the latest multicarrier communication technology is designed to improve the transmission rate and system reliability to realize information and interaction of smart grid. The system first respectively optimizes the signals in OFDM and GFDM by windowing and filter banks according to the characteristics of 230 MHz channel, so as to realize the suppression of adjacent channel interference at the transmitter. On the other hand, in order to better adapt to the change of the channel conditions, we introduce the adaptive modulation and coding scheme（AMC）. Turbo code is used and the transmission efficiency of different modulation and coding schemes is obtained by simulation. Using the Okamura-Hata model for the 230 MHz band, we obtain the coverage of the cell and the corresponding system performance with different coding rates and scenarios.

关键词： Smart grid wireless communication system adjacent frequency suppression adaptive modulation and coding link budget

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Intelligent AMC based on RB Group Level Uplink Interference Prediction 59

Intelligent AMC based on RB Group Level Uplink Interference ...

引用

59th Annual IEEE International Conference on Communications (IEEE ICC)

作者： Wang, Yu Sun, Qi Liu, Zening Xue, Xu Huang, Jinri Li, Nan China Mobile Res Inst Beijing Peoples R China Purple Mt Labs Pervas Commun Res Ctr Nanjing Peoples R China Beijing Univ Posts & Telecommun Sch Informat & Commun Engn Beijing Peoples R China

ISBN: (纸本)9798350304060;9798350304053

adaptive modulation and coding (AMC) technology plays a critical role in maintaining the transmission quality in 4G LTE (Long Term Evolution) and 5G NR (New Radio) wireless communication systems, to overcome the dynamic fluctuations of radio channel. The performance of AMC may deteriorate significantly if the outdated radio channel information is used for selecting the most suitable modulation and coding scheme. In this paper, an intelligent AMC method based on resource block (RB) group level uplink interference prediction is proposed. By taking the correlation relationships of the RBs into consideration, the AI/ML prediction model are derived in RB group level. It assures good prediction accuracy and also helps to shorten the inference latency. The prediction accuracy and network performance of the proposed solution are verified under a variety of scenarios with varied traffic patterns, network loads and mobility settings of interference users, demonstrating its superiority over existing solutions and applicable scenarios.

关键词： adaptive modulation and coding Uplink interference prediction RB group(RBG) STL decomposition GRU Model

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Resource Allocation in a Heterogeneous Wireless Network Using Fuzzy Logic 1

Resource Allocation in a Heterogeneous Wireless Network Usin...

引用

International Conference on Information and Communication Technology Research (ICTRC 2015)

作者： Taki, Mehrdad Heshmati, Milad Univ Isfahan Esfahan Iran

ISBN: (纸本)9781479989669

a new scheduling and link adaptation scheme is designed for a heterogeneous wireless network where a) different links are using the shared media with various throughput requirement based on their applications, b) links have different characteristics, c) various bit error rate constraints are to be considered at the receivers, d) based on the available power supplies different average transmission power constraints are to be met. A fuzzy based scheme with a low complexity is presented which may be implemented in a wide range of networks where channel's specifications are not available and network structure may be unknown. It is shown that the proposed fuzzy based scheme gives a close performance to analytical approach, however, with substantially lower CSI load and computational cost.

关键词： Resource allocation Heterogeneous Networks Scheduling adaptive modulation and coding Fuzzy Logic

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Power and bit allocation for adaptive turbo coded modulation in OFDM systems

Power and bit allocation for adaptive turbo coded modulation...

引用

IEEE Global Telecommunications Conference (GLOBECOM 03)

作者： She, XM Zhou, S Xu, X Yao, Y Tsing Hua Univ State Key Lab Microwave & Digital Commun Beijing 100084 Peoples R China

ISBN: (纸本)0780379748

We propose adaptive turbo coded modulation orthogonal frequency division multiplexing (OFDM) schemes with power variable over subcarriers, variable over subbands, and constant over subcarriers. Our object is to improve the overall throughput under target bit-error-rate (BER) for OFDM transmissions. Simulation results indicate that our fixed power adaptation scheme exhibits a more than 7dB signal-noise-ratio (SNR) gain relative to non-adaptive turbo coded modulation, and about 2dB additional gain can be achieved with our variable power adaptation. We also discuss the effect of the amount of subbands on throughput performance in our adaptive scheme.

关键词： adaptive modulation and coding turbo coded modulation OFDM

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Delay compensation strategies for an efficient radio resource management in DVB-S2 systems

Delay compensation strategies for an efficient radio resourc...

引用

2nd International Symposium on Wireless Communications Systems (ISWCS 2005)

作者： Niebla, CP Kissling, C German Aerosp Ctr Inst Commun & Navigat D-82234 Wessling Germany

ISBN: (纸本)078039206X

This paper deals with the design and evaluation of a complementary issue that supports efficient radio resource management strategies in DVB-S2 systems with adaptive coding and modulation: the selection of suitable modulation and coding schemes that maximize instantaneous channel efficiency for each receiver. The inherent delays in the considered satellite system causes that when the channel information is available at the Gateway, it is outdated. For this reason, delay compensation techniques are proposed in this paper in order to optimize the selection of suitable physical layer configurations.

关键词： DVB-S2 adaptive modulation and coding fade mitigation techniques resource management satellite efficiency performance delay compensation

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adaptive Switching Method with AMC and FSS 26

Adaptive Switching Method with AMC and FSS

引用

26th International Conference on Software, Telecommunications and Computer Networks (SoftCOM)

作者： Kojima, Shun Akao, Takashi Watanabe, Koya Katsuno, Masato Maruta, Kazuki Ahn, Chang-Jun Chiba Univ Grad Sch Engn Chiba Japan

ISBN: (纸本)9781538667705;9789532900873

In recent years, it is required to realize higher speed and higher quality mobile communication due to the increase in Internet use. adaptive modulation and coding (AMC) scheme is now commonly implemented to maximize the throughput performance under the given link qualities. Forward error correction (FEC) based link adaptation is effective to improve throughput in a lower SNR regime, however, it immolates maximal throughput in good channel condition. Frequency symbol spreading (FSS) has been proposed that can improve BER even without FEC. It fully exploits the frequency diversity gain by spreading symbol per subcarrier to all frequency components. This paper proposes a new adaptation control scheme for FSS-based OFDM incorporating AMC. Simulation result verifies its maximized throughput performance harvesting both of coding gain and frequency diversity gain.

关键词： adaptive modulation and coding frequency symbol spreading

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