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检索条件"主题词=Space-time coding"

共 730 条记录，以下是631-640 订阅

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Performance analysis of cooperative space-time coded systems

Performance analysis of cooperative space-time coded systems

引用

65th IEEE Vehicular Technology Conference

作者： Chu, L. Yuan, J. Univ New S Wales Sch Elect Engn & Telecommun Sydney NSW 2052 Australia

ISBN: (纸本)9781424402656

In this paper we analyze the performance of a general user cooperative space-time coded system in wireless network. The upper bound of the pairwise error probability (PEP) is derived, on slow, quasi-slow and fast fading channels. From the upper bounds, we show that cooperative space-time coded system in wireless network can achieve full cooperation diversity gain and coding gain. Based on the performance analysis, we formulate a generalized space-time code design criteria to construct better codes for user cooperation systems.

关键词： user cooperation cooperation diversity space-time coding fading channel

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A Fast Encoding Algorithm for a MIMO System with Finite-bit Feedback

A Fast Encoding Algorithm for a MIMO System with Finite-bit ...

引用

5th International Conference on Wireless Communications, Networking and Mobile Computing

作者： Wang, Haiquan Zhao, Zhijin Hangzhou Dianzi Univ Sch Commun Engn Hangzhou Zhejiang Peoples R China Hangzhou Dianzi Univ Coll Commun Engn Hangzhou Zhejiang Peoples R China

ISBN: (纸本)9781424436927

A MIMO system with finite-bit feedback based on fixed constellations is considered. For this system, an optimal operating system with maximum-likehood (ML)-decoding is demonstrated, and furthermore, to reduce encoding complexity, an asymptotic optimal operating system is also proposed. Theoretical analysis and simulations show that our encoding method has much less complexity than existing encoding methods.

关键词： beamforming fixed constellations finite-bit feedback MIMO space-time coding

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Rank metric and Gabidulin codes in characteristic zero

Rank metric and Gabidulin codes in characteristic zero

引用

IEEE International Symposium on Information Theory (ISIT)

作者： Augot, Daniel Loidreau, Pierre Robert, Gwezheneg Ecole Polytech INRIA Saclay Ile De France Palaiseau France Univ Rennes 1 DGA & IRMAR Rennes France Univ Rennes 1 IRMAR Rennes France

ISBN: (纸本)9781479904464

We transpose the theory of rank metric and Gabidulin codes to the case of fields of characteristic zero. The Frobenius automorphism is then replaced by any element of the Galois group. We derive some conditions on the automorphism to be able to easily transpose the results obtained by Gabidulin as well and a classical polynomial-time decoding algorithm. We also provide various definitions for the rank-metric.

关键词： space-time coding Gabidulin codes rank metric skew polynomials Ore rings algebraic decoding number fields

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EXPERIMENTAL PERFORMANCE EVALUATION OF BLIND CHANNEL ESTIMATION FOR ORTHOGONAL space-time BLOCK CODES

EXPERIMENTAL PERFORMANCE EVALUATION OF BLIND CHANNEL ESTIMAT...

引用

IEEE Sensor Array and Multichannel Signal Processing Workshop

作者： Havary-Nassab, Veria Shahbazpanahi, Shahram Grami, Ali Gershman, Alex B. Univ Ontario Inst Technol Fac Engn & Appl Sci Oshawa ON Canada Tech Univ Darmstadt Commun Syst Grp Darmstadt Germany

ISBN: (纸本)9781424422401

In this paper, we use a 4 x 4 MIMO testbed to investigate the experimental performance of the blind channel estimation technique presented in [1]. The operating frequency throughout all experiments was selected to be 2.47 GHz and the transmission bandwidth was 20 MHz. Our experimental results show that the performance of the blind technique can be very close to that of non-blind training based receiver which uses a significant bandwidth overhead as compared to the blind approach developed in [1].

关键词： Blind channel estimation MIMO communications MIMO testbed space-time coding experimental results

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A Low-Complexity Near-ML Detector for a 3 x n_R Hybrid space-time Code 9

A Low-Complexity Near-ML Detector for a 3 x <i>n<sub>R</sub>...

引用

9th IEEE Latin-American Conference on Communications (LATINCOM)

作者： Cortez, Joaquin Bazdresch, Miguel Longoria-Gandara, Omar Inst Tecnol Sonora Dept Elect Engn Obregon Mexico Rochester Inst Technol Elect Comp & Telecom Engn Tech Dept Rochester NY 14623 USA ITESO Univ Dept Elect Syst & IT Guadalajara Jalisco Mexico

ISBN: (纸本)9781538620984

In a MIMO wireless communications system, a space-time block code specifies how the data symbols are transmitted over different antennas at different time instants. A hybrid space-time code attempts to obtain some of the available diversity and multiplexing gains, achieving low error probability and high data rate. The LD STBC-VBLAST hybrid code layers one spatial-multiplexing antenna (to increase the data rate) and one Alamouti encoder (to provide diversity). A low-complexity, nearly optimum decoder algorithm for LD STBC-VBLAST is presented. Its error probability is comparable to that of a maximum-likelihood detector, with much lower computational complexity. The performance of the detector is evaluated over both uncorrelated and correlated channels. It is shown that the proposed decoder remains nearly optimum despite channel correlation.

关键词： space-time coding Near-ML detectors Correlated Channels

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MISO Single-Carrier System with Feedback Channel Information for Narrowband PLC Applications

MISO Single-Carrier System with Feedback Channel Information...

引用

IEEE International Symposium on Power Line Communications and Its Applications

作者： de Campos, Fabricio P. V. Machado, Renato Ribeiro, Moises V. de Campos, Marcello L. R. Univ Fed Rio de Janeiro Elect Engn Program COPPE POB 68504 BR-21945970 Rio De Janeiro Brazil Univ Fed Juiz de Fora Dept Elect Engn BR-36036 Juiz De Fora MG Brazil

ISBN: (纸本)9781424437917

Nowadays, the use of multiple-input multiple-output (MIMO) concepts is being investigated to improve performance of power line communication (PLC) systems, however few attentions have being put on how it can be applied to improve narrowband technologies based upon single-carrier (SC) modulation. In this paper, a multiple-input single-output (MISO)-SC system for narrowband PLC is devised and the applicability of feedback channel information into the MISO-SC system is considered. Simulation results with outdoor PLC channels and additive noise composed of background and impulsive components indicate that the MISO-SC system with partial feedback channel information can surpass the performances of MISO-SC without feedback and SISO-SC system with and without feedback channel.

关键词： Partial feedback channel information MIMO power line communication single-carrier modulation space-time coding

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Design rules for extended super-orthogonal space-time trellis codes

Design rules for extended super-orthogonal space-time trelli...

引用

Canadian Conference on Electrical and Computer Engineering

作者： Hartling, Elizabeth Rivera Chan, Francois Jafarkhani, Hamid Royal Mil Coll Canada Dept Elec & Comp Eng Kingston ON K7K 7B4 Canada Univ Calif Irvine Dept Elec Eng & Comp Sci Irvine CA 92697 USA

ISBN: (纸本)9781424416424

Super-orthogonal space-time trellis codes (SOSTTCs) can be systematically designed by computer by using the generator matrix representation. However, an exhaustive search becomes prohibitively complex as the number of states or the constellation size increases. Even for 8PSK, the complexity would be prohibitive. In this paper, it is shown that the number of matrices that generate unique codes and satisfy the set-partitioning rules is significantly smaller than the total number of possible matrices. Rules for the design of the generator matrices so that set-partitioning rules are satisfied are proposed. These rules lead to significant complexity reductions and are required for MPSK or MQAM SOSTTCs and codes with more than two transmit antennas. New QPSK and 8PSK SOSTTCs with spectral efficiencies of 2 and 3 b/s/Hz, respectively, which outperform previously known codes are presented.

关键词： diversity MIMO (Multiple-Input Multiple Output) space-time coding super-orthogonal codes

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An Alamouti-Based Path Selection Strategy for Multihop Relay Communications

An Alamouti-Based Path Selection Strategy for Multihop Relay...

引用

IEEE Region 10 Conference on TENCON 2010

作者： Butcharoen, Smich Pirak, Chaiyod King Mongkuts Univ Technol N Bangkok Sirindhorn Int Thai German Grad Sch Engn Bangkok Thailand

ISBN: (纸本)9781424468904

In this paper, we propose a modified Alamouti-based path selection (MAPS) strategy for multihop relay communication systems, and investigate a system performance in comparison with single path selection (SPS) and Alamouti-based path selection (APS) strategies. We also investigate the effect of a channel quality on the system performance when a channel is presumably good in the first hop and the last hop, respectively. Simulation results indicate that the proposed strategy achieves a better performance and gain more diversity than APS and SPS strategies. In addition, when the channel quality in the first hop is good, the system performance is superior to the case of good channel quality in the last hop.

关键词： Multi-hop Relay space-time coding Decode and forward Path selection Cooperative Communications

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Differential super-quasi-orthogonal space-time trellis codes

Differential super-quasi-orthogonal space-time trellis codes

引用

66th IEEE Vehicular Technology Conference

作者： Wang, Jun Qian, Jing Dou, Junhui Liu, Shouyin Jang, Seong-Hyun Chong, Jong-Wha Huazhong Normal Univ Dept Elect & Inf Engn Wuhan 430079 Peoples R China Hanyang Univ Coll Informat & Commun Seoul 133791 South Korea

ISBN: (纸本)9781424402632

This paper proposes a new differential super-quasi-orthogonal space-time trellis codes (SQOSTTC) with single-symbol maximum-likelihood (ML) decoding. Firstly, a new joint constellation, which can be used to construct a unitary matrix for quasi-orthogonal space-time block code (QOSTBC), is designed. Secondly, based on the joint constellation and criterion of maximizing the coding gain distance (CGD), set-partitioning is done. Finally, we introduce the simple single-symbol maximum-likelihood (ML) decoding. Simulation results show that our differential SQOSTTC can get better performance than the differential super-orthogonal space-time trellis code (SOSTTC) 151 with four transmit antennas at the transmission rate of 1.5 bits/s/Hz and lower decoding complexity than the differential super-pseudo-orthogonal space-time trellis codes (SPOSTTC) [13] and the differential SOSTTC [14] at the transmission rate of 2 bits/s/Hz.

关键词： space-time coding differential modulation super-quasi-orthogonal space-time trellis code joint constellation

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Partitioned Pseudo-Retrodirective Arrays for Capacity Expansion of Backscatter Communication Channels 12

Partitioned Pseudo-Retrodirective Arrays for Capacity Expans...

引用

IEEE International Conference on RFID (RFID)

作者： Varner, Michael A. Alhassoun, Mohammad Durgin, Gregory D. Georgia Inst Technol Sch Elect & Comp Engn 777 Atlantic Dr Atlanta GA 30332 USA

ISBN: (纸本)9781538614563

This paper presents the effects of partitioning scattering arrays with specific attention to retrodirective structures. By segmenting large arrays, total data transmission can be drastically increased while severely reducing design concerns associated with retrodirective feed networks. The behavior of partitioned retrodirective arrays is observed and quantified from link budget, information theory, and time-varying beam-forming perspectives. A retrodirective device is measured and it's characteristics used to simulate time-varying beam-forming behavior when used as a module in a partitioned pseudo-retrodirective array. The significant increase in range and channel capacity due to these structures will enable RFID systems that operate in microwave and millimeter wave regimes.

关键词： Partitioned scatterer arrays retrodirectivity pseudo-retrodirectivity beam-forming space-time coding capacity expansion backscatter radio MIMO

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