提高LTE/LTE- a网络链路自适应性能的有效模型。

IF 2.3 4区 计算机科学 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC
Ali Abdulqader Bin-Salem, Tat-Chee Wan, Hamad Naeem, Mohammed Anbar, Sabri M Hanshi, Abdellah Redjaimia
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引用次数: 0

摘要

链路自适应(Link adaptive, LA)是指根据无线电链路的质量调整调制方案(MS)和纠错编码率的能力。MS在提高LTE/LTE- a的性能方面起着重要作用,这通常取决于接收到的信噪比(SNR)。然而,考虑到自适应MSs对误差很敏感,仅使用信噪比来选择合适的MSs是不够的。同时,非最优的MS选择可能会严重影响系统性能,从而降低LA。在LTE/ LTE- a中,必须根据物理层(如MSs)和MAC层(如Packet loss)的特点对LA系统进行设计和优化,以提高信道效率和吞吐量。因此,本研究建议使用两个LA模型来克服这一问题。第一个模型称为跨层链接适应(CLLA)模型,它基于向下跨层方法。该模型旨在克服现有系统中自适应调制的精度问题,提高信道效率和吞吐量。第二个模型,称为CLLA (MDP-CLLA)模型上的马尔可夫决策过程,旨在改进调制水平的选择。此外,我们在MDP-CLLA模型中采用了我们之前的贡献,即修正的alpha-Shannon容量公式,以增强LTE/LTE- a的链路自适应能力。利用MATLAB和Simulink环境对瑞利衰落信道上的单输入单输出(SISO)传输模式在不同数据包大小下的吞吐量和丢包率进行了有效性评估。此外,相位生产率(定义为特定调制的总吞吐量与相邻调制信噪比阈值之差的乘积)用于确定特定数据包大小的最佳模型,以及在模型中确定特定数据包大小的最优数据包大小。结果表明,使用CLLA模型,与现有系统相比,(QPSK→16-QAM)和(16-QAM→64-QAM)调制转换的吞吐量分别从87.5%提高到89.6%和从0提高到43.3%。此外,与CLLA模型和现有系统相比,(QPSK→16-QAM)和(16-QAM→64-QAM)调制转换时,MDP-CLLA模型的吞吐量分别提高了87.5-88.6%和0-43.2%。通过对每个调制在特定分组大小下的相位生产率的总和验证了每个模型的结果,随后进行了应用单向方差分析(ANOVA)统计分析和事后检验,以证明MDP-CLLA模型比CLLA模型和现有系统具有最佳的高效率。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Efficient models for enhancing the link adaptation performance of LTE/LTE-A networks.

Efficient models for enhancing the link adaptation performance of LTE/LTE-A networks.

Efficient models for enhancing the link adaptation performance of LTE/LTE-A networks.

Efficient models for enhancing the link adaptation performance of LTE/LTE-A networks.

Link adaptation (LA) is the ability to adapt the modulation scheme (MS) and the coding rate of the error correction in accordance with the quality of the radio link. The MS plays an important role in enhancing the performance of LTE/LTE-A, which is typically dependent on the received signal to noise ratio (SNR). However, using the SNR to select the proper MSs is not enough given that adaptive MSs are sensitive to error. Meanwhile, non-optimal MS selection may seriously impair the system performance and hence degrades LA. In LTE/ LTE-A, the LA system must be designed and optimized in accordance with the characteristics of the physical (e.g., MSs) and MAC layers (e.g., Packet loss) to enhance the channel efficiency and throughput. Accordingly, this study proposes using two LA models to overcome the problem. The first model, named the cross-layer link adaptation (CLLA) model, is based on the downward cross-layer approach. This model is designed to overcome the accuracy issue of adaptive modulation in existing systems and improve the channel efficiency and throughput. The second model, named the Markov decision process over the CLLA (MDP-CLLA) model, is designed to improve on the selection of modulation levels. Besides that, our previous contribution, namely the modified alpha-Shannon capacity formula, is adopted as part of the MDP-CLLA model to enhance the link adaptation of LTE/LTE-A. The effectiveness of the proposed models is evaluated in terms of throughput and packet loss for different packet sizes using the MATLAB and Simulink environments for the single input single output (SISO) mode for transmissions over Rayleigh fading channels. In addition, phase productivity, which is defined as the multiplication of the total throughput for a specific modulation with the difference between adjacent modulation SNR threshold values, is used to determine the best model for specific packet sizes in addition to determine the optimal packet size for specific packet sizes among models. Results generally showed that the throughput improved from 87.5 to 89.6% for (QPSK 16-QAM) and from 0 to 43.3% for (16-QAM 64-QAM) modulation transitions, respectively, using the CLLA model when compared with the existing system. Moreover, the throughput using the MDP-CLLA model was improved by 87.5-88.6% and by 0-43.2% for the (QPSK 16-QAM)and (16-QAM 64-QAM) modulation transitions, respectively, when compared with the CLLA model and the existing system. Results were also validated for each model via the summation of the phase productivity for every modulation at specific packet sizes, followed by the application one-way analysis of variance (ANOVA) statistical analysis with a post hoc test, to prove that the MDP-CLLA model improves with best high efficiency than the CLLA model and the existing system.

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来源期刊
CiteScore
7.70
自引率
3.80%
发文量
109
审稿时长
8.0 months
期刊介绍: The overall aim of the EURASIP Journal on Wireless Communications and Networking (EURASIP JWCN) is to bring together science and applications of wireless communications and networking technologies with emphasis on signal processing techniques and tools. It is directed at both practicing engineers and academic researchers. EURASIP Journal on Wireless Communications and Networking will highlight the continued growth and new challenges in wireless technology, for both application development and basic research. Articles should emphasize original results relating to the theory and/or applications of wireless communications and networking. Review articles, especially those emphasizing multidisciplinary views of communications and networking, are also welcome. EURASIP Journal on Wireless Communications and Networking employs a paperless, electronic submission and evaluation system to promote a rapid turnaround in the peer-review process. The journal is an Open Access journal since 2004.
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