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Improving Bit-Error-Rate Performance Using modulation coding Techniques for Spin-Torque Transfer Magnetic Random Access Memory

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IEEE ACCESS 2023年 11卷 33005-33013页

作者： Nguyen, Thien An Lee, Jaejin Soongsil Univ Dept Informat Commun Convergence Technol Seoul 06978 South Korea

In non-volatile random-access memory (RAM) technologies, the spin-torque transfer magnetic random-access memory (STT-MRAM) is a promising candidate. STT-MRAM has attracted attention owing to its advantages, such as a high density, high endurance, and high-speed writing/reading. Moreover, STT-MRAM is utilized to replace dynamic random-access memory (DRAM) in Internet of Things (IoT) and artificial intelligence (AI) applications. However, because the magnetic tunnel junction is used to write data, STT-MRAM must face process variation and thermal fluctuation problems. This causes errors in writing and reading processes. These errors are independent of each other. Therefore, to solve them and increase the reliability of STT-MRAM, the data are encoded before storage in STT-MRAM devices. In this study, we propose a method for designing codewords using modulation coding techniques. Our codewords increase the minimum Hamming distance and inheritance of the sparse code characteristic to exploit the asymmetric probability of the write errors. The simulation results show that our codewords can improve the bit error rate performance of STT-MRAM compared with previous works.

关键词： Codes Magnetic tunneling Magnetohydrodynamics Random access memory Resistance Fluctuations Writing Cascaded channel model error correction codes (ECCs) non-volatile RAM modulation coding sparse codes spin-torque transfer magnetic random-access memory (STT-MRAM)

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Slow and fast adaptive modulation and coding for uplink massive MIMO systems with packet retransmission

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IET COMMUNICATIONS 2022年第9期16卷 915-928页

作者： Radbord, Amin Harsini, Jalil S. Univ Guilan Dept Elect Engn POB *** Rasht Iran

Here, the authors consider the uplink of a cellular massive multiple-input multiple-output (MIMO) system with maximum ratio combiner (MRC) at base stations (BSs). To achieve a better QoS provisioning, users in the cells employ link adaptation using adaptive modulation and coding (AMC) in conjunction with packet retransmission. The authors present a cross-layer approach for the AMC design exploiting the time variation feature of MIMO wireless channels. At first, a fast AMC (FAMC) scheme is proposed to adapt the fast small-scale fading of the wireless channel based on the instantaneous channel state information. Since the fast fading is asymptotically averaged out due to the channel hardening property of massive MIMO system, we then suggest a slow AMC (SAMC) scheme which adjusts the adaptation parameters based on only the large-scale channel fading statistics including shadow fading and pass loss of the channel. The SAMC substantially reduces the feedback rate and implementation cost because of using a larger coherence time compared to that of the FAMC. For the proposed schemes, the probability density function of signal-to-interference-plus-noise ratio (SINR) for MRC receivers at BSs is analytically derived and verified by simulation. Also, closed-form expressions are presented for the throughput and packet error outage of the system. Index Terms-Massive MIMO, MRC, AMC, ARQ, Performance analysis.

关键词： adaptive modulation MRC receivers fading channels cellular massive MIMO system MRC adaptive modulation and coding probability density function MIMO wireless channels maximum ratio combiner modulation coding packet error outage MIMO communication telecommunication network reliability AMC design signal-to-interference-plus-noise ratio diversity reception cellular radio radiofrequency interference cellular massive multiple-input multiple-output system quality of service FAMC scheme probability QoS packet retransmission uplink massive MIMO systems

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Multilevel modulation coding For Four-Level Holographic Data Storage Systems 13

Multilevel Modulation Coding For Four-Level Holographic Data...

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13th International Conference on Advanced Technologies for Communications (ATC)

作者： Chi Dinh Nguyen Nghia Xuan Pham Cuong Chinh Duong Luong Cong Nguyen Phenikaa Univ Fac Elect & Elect Engn Hanoi 12116 Vietnam A&A Green Phoenix Grp JSC Phenikaa Res & Technol Inst PRATI 167 Hoang Ngan Hanoi 11313 Vietnam Le Quy Don Tech Univ Fac Radioelect Engn Hanoi 100000 Vietnam Phenikaa Univ Fac Informat Technol Hanoi 12116 Vietnam

ISBN: (数字)9781728180656

ISBN: (纸本)9781728180656

The principal target of this study is to enhance the performance of the 4-level holographic data storage (HDS) systems by using a well-suited modulation code scheme. The HDS system is one of the most promising approaches for storing massive digital data for the next-generation optical data storage systems. However, the performance of retrieving data in the HDS system is severely affected by fatal interference (FI) patterns. The proposed coding design aims to get rid of all FI patterns during the recording procedure with reasonable computational complexity.

关键词： multilevel coding modulation coding holographic storage intersymbol interference

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Cross-Layer in MIMO-OFDM System with Adaptive modulation and coding: Design and Analysis

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Chinese Journal of Electronics 2025年第2期23卷 371-376页

作者： Junhui Zhao Xin Guan Xiuping Li Longji Zeng State Key Laboratory of Rail Traffic Control and Safety Beijing Jiaotong University Beijing China National Mobile Communications Research Laboratory Southeast University Nanjing China Key Laboratory of Wireless Sensor Network & Communication Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai China School of Electronic Engineering Beijing University of Posts and Telecommunications Beijing China

The queuing performance of the cross-layer system with Space-time block code (STBC) over Multi-input-multi-output (MIMO) channel is analyzed. The Adaptive modulation and coding (AMC) in physical layer and finite length of buffer in data-link layer are combined with this model. A simple cross-layer design and the queue state process are proposed based on finite state Markov channel model, which is to solve the service process. The proposed cross-layer design is also incorporated with STBC to further improve the system performance. Simulation results illustrate the dependence of system performance on various parameters, and quantify the performance gain due to cross-layer optimization. The adjustment of target packet loss rate of adaptive modulation coding in physical layer can maximize average throughput of the system, meanwhile a significant improvement of the system performance is brought.

关键词： Cross layer design Adaptive systems System performance Simulation Packet loss Physical layer Throughput Block codes modulation coding Optimization

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Moore state machine for adaptive modulation and coding in high-speed railway LTE-R systems

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ELECTRONICS LETTERS 2016年第9期52卷 776-777页

作者： Zhao, Yisheng Chen, Zhonghui Ji, Hong Fuzhou Univ Coll Phys & Informat Engn Fuzhou 350108 Peoples R China Beijing Univ Posts & Telecommun Minist Educ Key Lab Universal Wireless Commun Beijing 100876 Peoples R China

An adaptive modulation and coding (AMC) scheme based on a Moore state machine is proposed for the high-speed railway communication systems. By setting a buffer zone for the signal-to-noise ratio threshold value, the proposed scheme is able to reduce the frequent transition of the modulation and coding scheme. Simulation results show that the proposed AMC strategy has a more stable spectral efficiency than the traditional AMC method using a piecewise function.

关键词： Long Term Evolution adaptive codes railway communication signal processing modulation coding Moore state machine LTE-R systems adaptive modulation and coding high-speed railway communication systems buffer zone signal-to-noise ratio threshold value frequent transition AMC strategy AMC method piecewise function

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Adaptive modulation and coding techniques for global navigation satellite system inter-satellite communication based on the channel condition

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IET COMMUNICATIONS 2016年第16期10卷 2091-2095页

作者： Huang, Jinhui Su, Yingxue Liu, Wenxiang Wang, Feixue Natl Univ Def Technol Satellite Nav R&D Ctr Changsha Hunan Peoples R China

Inter-satellite link (ISL) will play an increasingly important role in the next generation of global navigation satellite system (GNSS). The inter-satellite distances in the GNSS vary greatly, resulting in a power loss difference of as much as 20 db. However, there are no reports on promotion of spectral efficiency in inter-satellite channels at present. In this study, the authors propose an efficient utilisation of the adaptive modulation and coding (AMC) scheme for ISLs in the GNSS. A novel method, based on inter-satellite distance, is presented for choosing the modulation and coding scheme (MCS). The proposed method provides a convenient way to estimate signal-to-noise ratio of the ISLs in GNSS. This AMC technique is implemented according to two different algorithms. One is the target bit error rate (BER) algorithm based on inter-satellite distance, aimed at keeping the BER below a target limit. The other is the maximum throughput algorithm based on inter-satellite distance, aimed at maximising the data throughput. In cases where the inter-satellite distance is short, simulation results show that, under the premise of the same transmission power, the throughput of two proposed AMC schemes is nearly six times that of a fixed MCS.

关键词： adaptive modulation adaptive codes satellite navigation satellite links wireless channels modulation coding error statistics adaptive modulation and coding technique Global Navigation Satellite System intersatellite communication channel condition intersatellite link ISL GNSS intersatellite distance AMC wireless data transmission spectral efficiency improvement data throughput improvement MCS signal-to-noise ratio estimation bit error rate algorithm BER algorithm

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SumComp: coding for Digital Over-the-Air Computation via the Ring of Integers

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IEEE TRANSACTIONS ON COMMUNICATIONS 2025年第2期73卷 752-767页

作者： Razavikia, Saeed da Silva Jr, Jose Mairton Barros Fischione, Carlo KTH Royal Inst Technol Sch Elect Engn & Comp Sci S-11428 Stockholm Sweden Uppsala Univ Dept Informat Technol S-75105 Uppsala Sweden KTH Royal Inst Technol Sch Elect Engn & Comp Sci & Digital Futures S-11428 Stockholm Sweden

Communication and computation are traditionally treated as separate entities, allowing for individual optimizations. However, many applications focus on local information's functionality rather than the information itself. For such cases, harnessing interference for computation in a multiple access channel through digital over-the-air computation can notably increase the computation, as established by the ChannelComp method. However, the coding scheme originally proposed in ChannelComp may suffer from high computational complexity because it is general and is not optimized for specific modulation categories. Therefore, this study considers a specific category of digital modulations for over-the-air computations, quadrature amplitude modulation (QAM) and pulse-amplitude modulation (PAM), for which we introduce a novel coding scheme called SumComp. Furthermore, we derive a mean squared error (MSE) analysis for SumComp coding in the computation of the arithmetic mean function and establish an upper bound on the mean absolute error (MAE) for a set of nomographic functions. Simulation results are presented to affirm the superior performance of SumComp coding compared to traditional analog over-the-air computation and the original coding in ChannelComp approaches in terms of both MSE and MAE over a noisy multiple access channel. Specifically, SumComp coding shows at least 10 dB improvements for computing arithmetic and geometric mean on the normalized MSE for low noise scenarios.

关键词： Encoding modulation Digital modulation Wireless networks Quadrature amplitude modulation Lattices Optimization Constellation points digital modulation Gaussian integers over-the-air computation modulation coding ring of integers

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5G-coded fluid antenna multiple access over block fading channels

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ELECTRONICS LETTERS 2025年第1期61卷

作者： Hong, Hanjiang Wong, Kai-Kit Tong, Kin-Fai Xu, Hao Li, Haoyang UCL Dept Elect & Elect Engn London England Shanghai Jiao Tong Univ Cooperat Medianet Innovat Ctr CMIC Shanghai Peoples R China

Fluid antenna multiple access (FAMA) is a concept capable of massive connectivity on the same physical channel without the need of precoding or interference cancellation, by exploiting a super-high dimensional received signal in the spatial domain from fluid antenna system (FAS). This letter investigates the use of 5G New Radio (NR) modulation coding Scheme (MCS) for FAMA systems to improve its connectivity over block fading channels. In particular, an iterative decoding receiver with iterative interference covariance estimation is proposed, designed explicitly for slow fading channels. Extrinsic information transfer (EXIT) chart is used to analyze the performance of the proposed iterative receiver. Both EXIT chart analysis and numerical results indicate that the proposed receiver outperforms the existing approach that uses fixed covariance in block fading channels. Also, the results indicate that coded FAMA can serve 100 user terminals (UTs) at the rate of 0.5 bit/s/Hz under rich scattering.

关键词： 5G mobile communication demodulation iterative decoding modulation coding multi-access systems

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Extended modulation mappings for hybrid ARQ in wireless communication systems

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SOFT COMPUTING 2024年第3期28卷 2469-2481页

作者： Kaidi, Hazilah Mad Ahmad, Norulhusna Izhar, Mohd Azri Mohd Hlaing, Ngu War Kamardin, Kamilia Sarip, Shamsul Dziyauddin, Rudzidatul Akmam Mohamed, Norliza Univ Teknol Malaysia Razak Fac Technol & Informat Kuala Lumpur Malaysia Univ Teknol Malaysia Malaysia Japan Int Inst Technol Kuala Lumpur Malaysia

This paper discusses an extended modulation mapping technique to improve hybrid automatic repeat request (ARQ) protocols by reducing communication errors in wireless systems. The extended mapping (EM) hybrid ARQ (HARQ) protocol has been developed using irregular repetition code with turbo processing. This protocol uses EM and ARQ to improve efficiency, including retransmission for error correction. The existing hybrid ARQ technique uses a horizontal iterative decoding scheme to reduce error. The suggested method employs both serial and parallel iterative decoding schemes for error detection and correction. A bit error rate (BER) analysis evaluates the proposed model, EM-HARQ performance in the additive white Gaussian noise channel. The results show a significant gain in signal-to-noise ratio (SNR) from the theoretical limit of the irregular repetition coding using MATLAB simulation software. The adoption of EM in the proposed method improves the SNR to a 0.99 dB performance gap difference and 0.3 dB performance gain due to enhanced error detection. Even with low SNR channels, the proposed EM-HARQ system can achieve a low BER and close to the theoretical limit capacity.

关键词： Wireless communication Hybrid ARQ Extended mapping Turbo process modulation coding Channel coding

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Research on Information Reconstruction Mechanism of Ghost Imaging Based on Rayleigh Fading Channel

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IEEE PHOTONICS TECHNOLOGY LETTERS 2025年第5期37卷 309-312页

作者： Ye, Hualong Guo, Daidou Changshu Inst Technol Sch Elect & Informat Engn Suzhou 215500 Peoples R China Univ Shanghai Sci & Technol Sch Opt Elect & Comp Engn Shanghai 200093 Peoples R China

In previous studies of ghost imaging transmission methods, the influence of real transmission channel on communication quality is weakened to a certain extent. Therefore, in this letter, a channel transmission model in real scenes (Rayleigh fading channel) is introduced. By leveraging the ultra-strong anti-noise capability and weak-signal imaging characteristics of ghost imaging, we explore ways to enhance the transmission of information while minimizing channel interference. Through the analysis of metrics such as bit error rate (BER), structural similarity (SSIM) and peak signal-to-noise ratio (PSNR), the proposed method effectively addresses issues like low restoration accuracy and limited feasibility of current transmission imaging methods, providing a new imaging technology for the research in the field of image transmission and holding significant theoretical value.

关键词： Imaging Image reconstruction modulation Mathematical models Image coding modulation coding Frequency modulation Rayleigh channels Optical imaging Lenses Rayleigh fading channel ghost imaging modulation coding reconstruction

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