检索结果-内蒙古大学图书馆

1st International Conference on Communications and Networking in China

作者： Xiao Liping Xu Chengqian Zhang Weifeng YanShan Univ Coll Informat Sci & Engn Qinhuangdao 066004 Hebei Peoples R China

ISBN: (纸本)1424404630

A full rate space-time block code (STBC) for four transmit antennas based on quasi-orthogonal design is proposed in this paper. The 4x4 transmission matrix of the presented quasi-orthogonal space-time block code (QOSTBC) is constructed based on Alamouti's scheme. The original maximum-likelihood (ML) decoding scheme and the low-complexity ML (LC-ML) decoding scheme for the new code are introduced. Then the decoding speed of them is compared. The simulation results show: the performance of the new code is better than that of orthogonal space-time block codes (OSTBC) at low SNR;it also exceeds the bit error rate (BER) of OSTBC at high SNR if the new code uses constellation rotation;the LC-ML decoding scheme is faster than the original ML decoding scheme.

关键词： Low-complexity maximum-likelyhood (LC-ML) orthogonal space-time block code Quasi-orthogonal space-time block code Wireless communication

来源：评论

学校读者我要写书评

暂无评论

Generalized Selection Combining Scheme for orthogonal space-time block codes with M-QAM and M-PAM Modulation Schemes

引用

WIRELESS PERSONAL COMMUNICATIONS 2017年第3期94卷 1619-1641页

作者： Bhaskar, Vidhyacharan Kandpal, Divya San Francisco State Univ Dept Elect & Comp Engn 1600 Holloway Ave San Francisco CA 94132 USA Northwestern Polytech Univ Dept Elect Engn 47650 Westinghouse Dr Fremont CA 94539 USA SRM Univ Dept Elect & Commun Engn Kattankulathur 603203 Tamil Nadu India

Multiple-input multiple-output (MIMO) systems implement multiple antennas to enhance diversity gain of wireless communication systems. Earlier work in generalized selection combining (GSC) focused on single-input multiple-output systems without space-time coding. Recently, with the aid of space-time coding, diversity gain became possible using multiple transmit antennas. In this paper, GSC scheme is applied to orthogonal space-time block codes (OSTBC) for 4 x L and 8 x L MIMO systems with various modulation schemes like M-PSK, M-QAM, and M-PAM in a slowly fading Rayleigh channel. The performance of GSC for half rate-full diversity, full rate-full diversity, and 3/4 rate-full diversity OSTBC is discussed and compared. Approximate closed-form expressions for symbol error rate (SER) and ergodic capacity for various OSTBCs are derived. The impact of channel estimation errors on system performance is also examined. Approximate closed-form expressions for performance bounds on SER and ergodic capacity of GSC for MIMO OSTBC are also derived and plotted.

关键词： Multiple-input multiple-output Generalized selection combining Maximal ratio combining Alamouti scheme orthogonal space-time block code Half rate and full rate diversity

来源：评论

学校读者我要写书评

暂无评论

Precoding of orthogonal space-time block codes in arbitrarily correlated MIMO channels: Iterative and closed-form solutions

引用

IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS 2007年第3期6卷 1072-1082页

作者： Hjorungnes, Are Gesbert, David Univ Oslo Unik Univ Grad Ctr N-2027 Kjeller Norway Eurecom Inst Mobile Commun Dept F-06904 Sophia Antipolis France

A memoryless precoder is designed for orthogonal space-time block codes (OSTBCs) for multiple-input multiple-output (MIMO) channels exhibiting joint transmit-receive correlation. Unlike most previous similar works which concentrate on transmit correlation only and pair-wise error probability (PEP) metrics: 1) The precoder is designed to minimize the exact symbol error rate (SER) as function of the channel correlation coefficients, which are fed back to the transmitter. 2) The correlation is arbitrary as it may or may not follow the so-called Kronecker structure. 3) The proposed method can handle general propagation settings including those arising from a cooperative macro-diversity (multi-base) scenario. We present two algorithms. The first is suboptimal, but provides a simple closed-form precoder that handles the case of uncorrelated transmitters, correlated receivers. The second is a fast-converging numerical optimization of the exact SER which covers the general case. Finally, a number of novel properties of the minimum SER precoder are derived.

关键词： MIMO orthogonal space-time block code precoder optimization minimum exact symbol error rate power constraint

来源：评论

学校读者我要写书评

暂无评论

Constant Weight Polar coded orthogonal space-time block codes for Dimmable Indoor MIMO-VLC Systems

引用

IEEE COMMUNICATIONS LETTERS 2022年第10期26卷 2395-2399页

作者： Babalola, O. P. Balyan, V Cape Peninsula Univ Technol Dept Elect Elect & Comp Engn ZA-7535 Bellville South Africa

The concatenation of constant weight polar code (CWPC) with orthogonal space-time block code (OSTBC), known as CWPC-OSTBC scheme is proposed for the indoor multiple-input multiple output visible light communication (MIMO-VLC) systems in this letter. The CWPC helps to mitigate against flickering, provides desired dimming targets, and coding gain while the OSTBC achieves MIMO diversity gain. Flicker mitigation and dimming control are obtained based on the modified Knuth balancing method with enhanced prefix coding. This method does not utilise lookup table and thus, it is practicable in the real-time. Numerical results are presented to discuss the channel capacity and bit-error-rate (BER) performance of the proposed CWPC-OSTBC scheme considering different parameters. The results show that increasing the transmission antennas of the OSTBC system provides diversity gains. More so, the CWPC-OSTBC scheme yields an improved coding gain compared to polar code without balancing and other state-of-the-art methods.

关键词： Decoding Encoding Polar codes codes Light emitting diodes Symbols Reliability Constant weight polar code multiple-input-multiple-output orthogonal space-time block code visible light communication

来源：评论

学校读者我要写书评

暂无评论

Capacity of orthogonal space-time block codes in MISO fading channels with co-channel interference and noise

引用

Science in China(Series F) 2009年第9期52卷 1697-1703页

作者： YUE DianWu WANG Qian College of Information Engineering Dalian Maritime University Dalian 116026 China National Mobile Communications Research Laboratory Southeast University Nanjing 210096 China

orthogonal space-time block codes （OSTBCs） are an efficient mean in order to exploit the diversity offered by the wireless multiple-input multiple-output （MIMO） channel. This paper considers capacity problems of OSTBCs over spatially correlated multiple-input single-out （MISO） Rayleigh fading channels in the presence of spatially correlated Rayleigh co-channel interference and additive Gaussian noise, and derives exact expressions of the ergodic capacity and outage probability （capacity distribution） for such OSTBCs. Some numerical examples are given to illustrate the effect of co-channel interference on the ergodic and outage capacity of OSTBCs.

关键词： multiple-input single-output orthogonal space-time block code capacity co-channel interference noise

来源：评论

学校读者我要写书评

暂无评论

A QR-Based Detection Scheme of orthogonal space-time block codes for Very Fast Fading Channels

A QR-Based Detection Scheme of Orthogonal Space-Time Block C...

引用

63rd IEEE Vehicular Technology Conference

作者： Yu, Donghun Lee, Jae Hong Seoul Natl Univ Sch Elect Engn Seoul 151742 South Korea Seoul Natl Univ INMC Seoul 151742 South Korea

ISBN: (纸本)9780780393912

In this paper, we propose a QR-based detection scheme of orthogonal space-time block codes for very fast fading channels. The proposed detection scheme employs a QR decomposition on the channel matrix and minimizes noise enhancement which occurs in an existing detection scheme. The performance of the proposed detection scheme is evaluated by computer simulations for various very fast fading channels. It is shown that when the channel fading is very fast, the proposed detection scheme outperforms the existing detection scheme.

关键词： orthogonal space-time block code QR Decomposition Very Fast Fading Channels

来源：评论

学校读者我要写书评

暂无评论

On the Capacity of Quasi orthogonal space-time block codes for MIMO Systems

On the Capacity of Quasi Orthogonal Space-Time Block Codes f...

引用

2005年无线通信、网络和移动计算国际会议

作者： Yipeng LI Zhongfu YE Institute of Statistical Signal Processing University of Science & Technology of China Hefei 230027 P.R.CHINA

ISBN: (纸本)078039335X

It is well known that the Alamouti scheme with two transmit antennas and one receive antennas is the only capacityachieving complex orthogonal space-time block code(OSTBC).The rate of complex OSTBC for systems with more than two transmit antennas is always less than 1. Recently, a quasi orthogonal space-time block code(QSTBC) with four transmit antennas and one receive antenna was proposed, which has the ability to approach the capacity, although at the price of sacrificing part of the diversity gain. In this paper, we analyze the capacity of QSTBC with four transmit antennas and arbitrary number of receive antennas. We show that the portion of the capacity that the QSTBC can achieve decreases with the number of receive antennas, and the (4,1) configuration is the only capacity-approaching case. In the high signal-to-noise ratio regime, we calculate the limit portion of capacity of QSTBC, and find that it is fixed to 1/4 when the number of receive antennas is no less than four. Numerical simulations verify our conclusions.

关键词： MIMO systems antenna arrays block codes channel capacity channel coding receiving antennas space-time codes transmitting antennas orthogonal space-time block code quasiorthogonal space-time block codes receive antenna signal-to-noise ratio t

来源：评论

学校读者我要写书评

暂无评论

A comparative study of ultra-massive MIMO intelligent receivers with adversarial robustness and energy efficiency for 6G applications

引用

Results in Engineering 2025年 26卷

作者： Pushkar Nidagundi Advesh Darvekar Malik Amber Ramesh R School of Electronics Engineering Vellore Institute of Technology Chennai Tamil Nadu 600127 India

Ultra-Massive Multiple Input Multiple Output (UM-MIMO) systems are pivotal for 6G wireless networks, enabling unprecedented data rates and spectral efficiency. However, optimizing these systems requires a careful balance between energy efficiency, spectral efficiency, and Bit Error Rate (BER) performance. This paper proposes a novel Taguchi-based optimization framework that systematically fine-tunes power allocation, modulation schemes, and space-time coding parameters, reducing computational complexity by up to 85 % compared to exhaustive search. The approach integrates advanced technologies including UM-MIMO, cognitive radio, and Artificial Intelligence (AI)-based detection to enhance robustness against adversarial attacks. Simulation results demonstrate that the optimized Minimum Mean Square Error (MMSE) detector achieves up to 95 % reduction in Bit Error Rate (BER) compared to Zero-Forcing (ZF) in small-to-medium UM-MIMO configurations (2 × 2 to 32 × 32), as shown in Tables (4 and 5), while maintaining computational feasibility. For ultra-massive configurations (256 × 256 to 1024 × 1024), optimized ZF offers the best trade-off between performance and energy efficiency. The Taguchi method yields up to 40 % improvement in energy efficiency while maintaining near-perfect BER. Practical implications of massive power consumption, system complexity, and execution time are discussed, alongside a comparative analysis with recent neural network and genetic algorithm optimizations. Limitations of simulation-based evaluation and a plan for experimental validation are also presented. The findings establish deployment guidelines for mission-critical versus energy-sensitive 6G applications.

关键词： UM-MIMO: Ultra-massive multiple input multiple output BER: Bit error rate SNR: Signal-to-noise ratio AWGN: Additive white Gaussian noise ZF: Zero-forcing UM-MIMO Ultra-Massive Multiple Input Multiple Output BER Bit Error Rate SNR Signal-to-Noise Ratio AWGN Additive White Gaussian Noise ZF Zero-Forcing MMSE Minimum Mean Square Error ML Maximum Likelihood BPSK Binary Phase Shift Keying QPSK Quadrature Phase Shift Keying QAM Quadrature Amplitude Modulation STBC space-time block code OSTBC orthogonal space-time block code AI Artificial Intelligence CNN Convolutional Neural Network 6G Sixth Generation

来源：评论

学校读者我要写书评

暂无评论

Low-Complexity Decoding in DF MIMO Relaying System

引用

IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY 2013年第3期62卷 1123-1137页

作者： Bansal, Ankur Bhatnagar, Manav R. Hjorungnes, Are Han, Zhu Indian Inst Technol Delhi Dept Elect Engn New Delhi 110016 India Univ Oslo Univ Grad Ctr UNIK NO-2027 Kjeller Norway Univ Houston Dept Elect & Comp Engn Houston TX 77004 USA

We derive a maximum-likelihood (ML) decoder for decode-and-forward (DF) based multiple-input-multiple-output (MIMO) cooperative systems having an equal number of antennas at the source and relay nodes, and utilizing an arbitrary complex-valued M-ary constellation. The DF-based MIMO cooperative system considered in this paper utilizes orthogonal space-time block codes (OSTBCs) for the transmission of data of the source to the destination. To reduce the decoding complexity, a suboptimal piecewise linear (PL) decoder is also derived, which performs close to the ML decoder. The proposed ML and PL decoders are applicable to arbitrary complex-valued M-ary constellations and require the destination node to possess knowledge of the channel statistics of the source-relay (S-R) links, whereas the existing decoder of multi-antenna-based DF cooperative systems needs to know the exact channel coefficients of the S-R link at the destination. The proposed decoders outperform an amplify-and-forward (AF)-protocol-based multi-antenna cooperative system. We obtain an expression of the average probability of error of the proposed PL decoder using an M-phase-shift keying (M-PSK) constellation and a single MIMO relay. The approximate symbol error rate (SER) of the proposed PL decoder is derived with multiple MIMO relays, M-PSK constellation, and asymptotically high signal-to-noise ratio (SNR) of the S-R links. It is analytically shown that the proposed ML and PL decoders achieve maximum possible diversity in the multi-antenna cooperative system with a single relay.

关键词： Decode-and-forward protocol diversity multiple-input multiple-output systems orthogonal space-time block code

来源：评论

学校读者我要写书评

暂无评论

Secure space-time Communications Over Rayleigh Flat Fading Channels

引用

IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS 2016年第2期15卷 1491-1504页

作者： Li, Xiangming Fan, Rongfei Ma, Xiaoli An, Jianping Jiang, Tao Beijing Inst Technol Sch Informat & Elect Engn Beijing 100081 Peoples R China Georgia Inst Technol Sch Elect & Comp Engn Atlanta GA 30332 USA Huazhong Univ Sci & Technol Sch Elect Informat & Commun Wuhan 430074 Peoples R China

In this paper, we consider the wire-tap channel model consisting of three users, namely, a transmitter, a legal receiver, and an eavesdropper, where the eavesdropper has possible unlimited centralized or distributed multiple antennas, while the legal user has just a single antenna. With this model, we study the realization of strict positive secrecy rate through Rayleigh flat fading channels using M-ary phase shift keying (PSK) and orthogonal space-time block code (OSTBC) based on channel reciprocal principle. We demonstrate that the information rate at the eavesdropper can be reduced to zero and a positive communication rate at the legal receiver can be realized if the transmitter employs a proper phase precoder based on the channel reciprocal, and uses OSTBC and M-ary PSK modulations for data transmissions. Application examples of space-time codes for positive secrecy rate are illustrated. As we have given the eavesdropper more capabilities than the legal receiver and thus captured a worst case scenario, any positive secrecy rate that is achieved serves as a lower bound on the secrecy capacity.

关键词： Multiple antennas orthogonal space-time block code positive secrecy rate wire-tap channel

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：