检索结果-内蒙古大学图书馆

A/D clipping effects on STBC scheme in receivers employing direct conversion structure

ELECTRONICS LETTERS 2004年第5期40卷 352-354页

作者： Gor, L Faulkner, M Singh, J Victoria Univ Sch Elect Engn Melbourne Vic 8001 Australia Victoria Univ Ctr Telecommun & Microelect Melbourne Vic Australia

The performance of the Alamouti space time block coding (STBC) technique and single-input single-output (SISO) system is compared in the presence of A/D clipping. Square clipping, imposed by a direct conversion receiver structure was considered. With the target symbol error rate of 10(-3) it was shown that STB coded signals have higher clip floor, and sensitivity to noise, when compared to the SISO system.

关键词： AD single input single output systems space time block coding direct conversion Receivers

来源：评论

学校读者我要写书评

暂无评论

Performance evaluation of a downlink MIMO wideband code-division multiple access-based radio-over-fibre system using Alamouti space-time block code

引用

IET COMMUNICATIONS 2019年第8期13卷 955-962页

作者： Baghersalimi, Gholamreza Rahimi, Mohammad Nassiri, Mahdi Univ Guilan Dept Elect Engn Rasht Iran

In this work, the effect of a radio-over-fibre (RoF) subsystem on the bit error rate (BER), total degradation (TD) and system capacity performances of downlink multiple-input multiple-output (MIMO) wideband code division multiple access (WCDMA) are assessed. The research investigates the use of maximal ratio combining (MRC) in single-input multiple-output (SIMO) schemes and Alamouti space-time block coding (STBC) in MIMO systems to compensate for the collective effects of the optical subsystem and the radio channel for different channel conditions and number of users. Results show that the aforementioned techniques are effective methods to compensate for both the non-linearity of the optical subsystem and the time-varying wireless radio frequency (RF) channel. It is also demonstrated that by increasing the number of users for severe non-linearity conditions, the BER performance of the system is significantly affected. Also, an appropriate quiescent point can always be found for the optical subsystem which improves the system performance irrespective of different conditions.

关键词： System performance bit error rate performance multiple input multiple output systems space time block coding SUB-SYSTEM wireless channels nonlinearity WCDMA

来源：评论

学校读者我要写书评

暂无评论

CS reconstruction in MIMO channel using square complex orthogonal STB codes

引用

MICROSYSTEM TECHNOLOGIES-MICRO-AND NANOSYSTEMS-INFORMATION STORAGE AND PROCESSING SYSTEMS 2017年第9期23卷 4289-4306页

作者： Pramanik, Ankita Maity, Santi P. Indian Inst Engn Sci & Technol Sibpur India

Compressed sensing (CS) is the process of signal reconstruction at a rate far below the Nyquist sampling rate. Sometimes, CS measurements need transmission over radio mobile channel for bandwidth preserving and energy efficient system design and/or application specific system design such as wireless body area network (WBAN), remote surveillance system etc. To this aim, this work proposes an integrated system design for quality improvement in CS reconstructed images over radio mobile channel modelled as Rayleigh flat fading. The design of a non-zero-entry Single Symbol Decodable Square Complex Orthogonal, space time block Codes (STBC) for 16 antennas is proposed first. This multi-channel facility is then exploited for transmission of CS measurements, which at the receiver side, undergo Robbins-Monro (RM) method, a non-parametric stochastic approach for predicting the unobserved spaces from the observed ones through recursive filtering. Similar study is also done using a relaxed convex optimization of the basis pursuit algorithm, a parametric based approach. Extensive simulation results highlight the efficacy of the proposed CS and STBC (CS-STBC) scheme for the quality improvement on the reconstructed images as the variation in the number of antennas, change in the number of measurements and variation on signal-to-noise ratio. It also highlights significant performance gain in CS reconstruction over radio mobile channel using STBC framework.

关键词： space time block coding Quality Improvement Signal reconstruction bed shifting

来源：评论

学校读者我要写书评

暂无评论

A view on full-diversity modulus-preserving rate-one linear space-time block codes

引用

SIGNAL PROCESSING 2006年第8期86卷 1968-1975页

作者： Zhou, Shengli Ma, Xiaoli Pattipati, Krishna Univ Connecticut Dept Elect & Comp Engn Storrs CT 06269 USA Auburn Univ Dept Elect & Comp Engn Auburn AL 36849 USA

In this paper, we consider the class of linear space time block codes (STBCs) that possess the following properties: (i) enabling full antenna diversity, (ii) preserving the modulus of information symbols, and (iii) achieving the maximum rate of one symbol per channel use under (i) and (ii). We first provide an alternative construction for full-diversity rate-one STBCs that are based on linear constellation precoding (LCP). In sharp contrast to existing LCP-based designs, the proposed construction is modulus-preserving, thanks to an explicit unitary diagonal precoding on symbol blocks combined with an implicit fast-Fourier-transform (FFT) precoding via circularly shifted transmissions over multiple antennas. Our proposed construction also allows flexible choices on the precoder size, a feature not available in the original design. We then demonstrate that quasi-orthogonal (QO) STBCs can be constructed by embedding modulus-preserving LCP designs into orthogonal structures. Interestingly, QO-STBCs can be interpreted as space-time-frequency (STF) block codes, that were originally developed for multi-antenna multi-carrier systems, up to FFT transformations. (c) 2005 Elsevier B.V. All rights reserved.

关键词： space time block coding linear constellation precoding circular delay diversity quasi-orthogonal full antenna diversity modulus-preserving

来源：评论

学校读者我要写书评

暂无评论

Performance of LSE-RLS-based interference cancellation scheme for STBC multiuser systems

引用

ELECTRONICS LETTERS 2002年第25期38卷 1729-1730页

作者： Mahinthan, V Kannan, B Nallanathan, A Natl Univ Singapore Dept Elect & Comp Engn Singapore 119260 Singapore Tele Tech Pk Inst Commun Res Singapore 117674 Singapore

An interference cancellation based on the least square error-recursive least square (LSE-RLS) scheme for space-time block coded (STBC) multiuser systems is presented. This scheme does not require any explicit knowledg... 详细信息

关键词： Scheme Multi access systems space time block coding Interference cancellation

来源：评论

学校读者我要写书评

暂无评论

Unified model for time-domain implementation of space block coded OFDM

引用

ELECTRONICS LETTERS 2009年第25期45卷 1336-U88页

作者： Ahmed, A. Said, F. Kings Coll London Ctr Telecommun Res Div Engn London WC2R 2LS England

A new scheme for time-domain implementation of space-frequency block coded (SFBC) OFDM is derived. The scheme has a block structure similar to that of time-domain implemented space-time block coded (STBC) OFDM, leading to a unified block structure for time-domain implementation of either STBC- or SFBC-OFDM, or for adaptive switching between the two. The new scheme is also shown to have complexity reduction advantages over existing schemes in the literature.

关键词： space-frequency block coding UNIFIED MODEL Scheme Masonry construction Self tuning Orthogonal frequency division multiplexing space time block coding

来源：评论

学校读者我要写书评

暂无评论

Adaptive SR-ARQ combined with STBC in Markov channels

引用

ELECTRONICS LETTERS 2004年第6期40卷 377-378页

作者： Femenias, G Univ Illes Balears Dept Matemat & Informat Balears 07122 Spain

The throughput and packet error rate for a selective-repeat ARQ scheme based on a constant-power variable-rate adaptive M-QAM system combined with orthogonal STBC in Nakagami Markovian channels is analysed. The impact... 详细信息

关键词： dwell time Automatic repeat request space time block coding Markov Throughput Self tuning

来源：评论

学校读者我要写书评

暂无评论

Performance of OFDM-IDMA and OFDM-CDMA architectures over frequency selective MISO channels

Performance of OFDM-IDMA and OFDM-CDMA architectures over fr...

引用

IEEE International Symposium on Antennas and Propagation / USNC/URSI National North American Radio Science Meeting

作者： Belaoura, Widad Ghanem, Khalida Djeddou, Mustapha EMP Commun Syst Lab Algiers Algeria CDTA Syst Architecture Lab Algiers Algeria

ISBN: (纸本)9781479978151

The presence of inter-symbol interference (ISI), in addition to multiple access interference (MAI), severely hampers the performance of a communication system. To overcome such impairments, the OFDM-CDMA and OFDM-IDMA techniques have been proposed. In this paper, the space-time block coding (STBC) scheme is used in the aforementioned OFDM-CDMA and OFDM-IDMA architectures with two transmit antennas, in order to offer an additional reliability of the wireless link. The performance gain over the SISO configuration is demonstrated.

关键词： transmitting antennas space time block coding multiple-input single-output ARCHITECTURE Multiple access interference intersymbolic interference Radio links GSTZ1 gene

来源：评论

学校读者我要写书评

暂无评论

Low PAPR and Spatial Diversity for OFDM Schemes by using L2-Orthogonal CPM ST-Codes with Fast Decoding 6

Low PAPR and Spatial Diversity for OFDM Schemes by using L2-...

引用

IEEE Latin-America Conference on Communications LATINCOM

作者： Hisojo, Miguel Angel Lebrun, Jerome Deneire, Luc Univ Nice Sophia Antipolis CNRS Lab I3S Nice France

ISBN: (纸本)9781479971626

Orthogonal Frequency Division Multiplexing (OFDM) is a popular modulation technique that provides high data rates and good robustness against frequency selective fading. space-time block coding (STBC) is an efficient way to introduce space-time diversity in Multiple-Input Multiple-Output (MIMO) systems. Using non-linear modulations such as Continuous Phase Modulation (CPM) with its constant envelope and continuous phase properties could be a solution to construct MIMO OFDM systems and to avoid the structural limitations of linear codes and alleviate the typical PAPR issue of OFDM. However, a major issue with CPM based systems may remain: the decoding complexity. In this paper, we introduce a new space-time-frequency diversity technique based on L2-orthogonal multi-h CPM space-time codes designed for OFDM transmission. We benchmark these codes under Rayleigh frequency selective channels and show how they achieve full spatial diversity at full rate for any number of antennas, good spectral compactness and also robustness to frequency fading. Furthermore, the decoding complexity is highly reduced and even made linear in the number of antennas thanks to the orthogonality properties.

关键词： MIMO communication OFDM modulation Rayleigh channels antenna arrays computational complexity decoding diversity reception linear codes space-time block codes CPM CPM-based systems L2-orthogonal CPM ST-codes L2-orthogonal multiA CPM space-time codes MIMO OFDM systems OFDM transmission PAPR issue Rayleigh frequency selective channels STBC constant envelope continuous phase modulation continuous phase properties decoding complexity fast decoding frequency selective fading full-spatial diversity modulation technique multiple-input multiple-output systems nonlinear modulation orthogonal frequency division multiplexing orthogonality properties space-time block coding space-time diversity space-time-frequency diversity technique spectral compactness Bit error rate Decoding Frequency diversity Modulation OFDM Transmitting antennas Orthogonal frequency division multiplexing space time block coding linear codes multiple input multiple output systems DEcoding Critical path method continuous phase modulation nonlinear modulation selective fading Frequency diversity transmitting antennas MIMO communication spatial diversity Raleigh fading channels diversity reception

来源：评论

学校读者我要写书评

暂无评论

Embedded space-time block Codes for Concatenated Systems 14

Embedded Space-Time Block Codes for Concatenated Systems

引用

XIV Int Symposium Problems Redundancy Inform Control Syst

作者： Kreshchuk, Alexey Zyablov, Victor Inst Informat Transmiss Problems Moscow Russia

ISBN: (纸本)9781479940509

In this paper we propose new coded modulation for multiple-input and multiple-output (MIMO) communication systems. This coded modulation is a genralised concatenated code. Its inner code is embedded Golden code which we introduce in this paper with a decoding algorithm. Its outer code is a product code with component Reed-Solomon code. We use iterative decoding algorithm for this product code. The performance of the proposed system is estimated with a computer simulation.

关键词： Gold codes MIMO communication Reed-Solomon codes concatenated codes iterative decoding modulation coding product codes space-time block codes MIMO communication systems RS code coded modulation component Reed-Solomon code computer simulation embedded Golden code embedded space-time block codes generalised concatenated code iterative decoding algorithm multiple-input and multiple-output communication systems product code Concatenated codes Decoding Iterative decoding MIMO Modulation space-time codes Vectors Product codes modulation coding Reed-Solomon codes Concatenated codes Iterative decoding MIMO communication Gold codes space-time codes decoding algorithm Computer Simulation multiple input multiple output systems DEcoding space time block coding block codes COMMUNICATION SYSTEMS

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：