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检索条件"主题词=Modulation coding"

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Arbitrary Rate Permutation modulation for the Gaussian Channel

Arbitrary Rate Permutation Modulation for the Gaussian Chann...

引用

IEEE International Symposium on Information Theory

作者： Oliver Henkel Fraunhofer German-Sino Laboratory for Mobile Communications (MCI) Berlin Germany

ISBN: (纸本)9781424413973;1424413974

In this paper non-group permutation modulated sequences for the Gaussian channel are considered. Without the restriction to group codes rather than subsets of group codes, arbitrary rates are achievable. The code construction utilizes the known optimal group constellations to ensure at least the same performance but exploit the Gray code ordering structure of multiset permutations as a selection criterion at the decoder. The decoder achieves near maximum likelihood performance at low computational cost and low additional memory requirements at the receiver.

关键词： Gaussian channels Maximum likelihood decoding modulation coding Maximum likelihood detection History Tin Mobile communication Reflective binary codes Computational efficiency Mathematical programming

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Trellis-Coded Balanced Space-Time Block Code Selection

Trellis-Coded Balanced Space-Time Block Code Selection

引用

IEEE Signal Processing and Communications Applications (SIU)

作者： Selami Sahin Mehmet E. Celebi Umit Aygolu TÜBITAK Ulusal Elektronik ve Kriptoloji Araştirma Enstitüsü Gebze Kocaeli Turkey Elektrik-Elektronik Fakültesi Elektronik ve Haberleşme Mühendisliği Bölümü Istanbul Teknik Üniveristesi Maslak Istanbul Turkey

In this paper, a trellis coded balanced space-time block code selection scheme (TC/BSTBCS) which is obtained by using balanced space-time block code selection (BSTBCS) with super-orthogonal space-time trellis coding (SOSTTC) is proposed for wireless communication. As a result of using the transmission matrices of BSTBCS - instead of Alamouti code in SOSTTC - at states of trellis structures with various types, various trellis structures are obtained. The performances of trellis structures which are obtained by coding gain distance (CGD) analysis for BPSK modulation are investigated with computer simulations. It is observed that the diversity advantages from BSTBCS is superior than CGD criterion.

关键词： Block codes Binary phase shift keying Quadrature phase shift keying Wireless communication Performance gain Performance analysis modulation coding Computer simulation

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Performance of Scheduling Algorithms for HSDPA

Performance of Scheduling Algorithms for HSDPA

引用

International Conference on Communications and Networking in China (CHINACOM)

作者： Matthias Malkowski Andreas Kemper Xiaohua Wang Communication Networks RWTH Aachen University Aachen Germany

The high speed downlink packet access (HSDPA) is one of the newest extensions to the Universal Mobile Telecommunications System (UMTS). HSDPA allows for higher data rates due to new adaptive modulation and coding (AMC) techniques, a hybrid automatic repeat request (H-ARQ) protocol and a fast scheduling algorithm. The fast scheduling, taking into account the current channel conditions of each user, contributes significantly to the performance of HSDPA by the so called multiuser diversity gain. Within the scope of this paper several scheduling algorithms are introduced and are analyzed with respect to both, the overall system performance and the individual user quality of service (QoS) constraints. Results illustrate the trade-off between the conflicting targets of high cell throughput and the delay requirements for real-time services.

关键词： Scheduling algorithm Multiaccess communication Quality of service Downlink 3G mobile communication modulation coding Automatic repeat request Access protocols Diversity methods Performance analysis

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Enumerative Encoding with Non-Uniform modulation Constraints

Enumerative Encoding with Non-Uniform Modulation Constraints

引用

IEEE International Symposium on Information Theory

作者： Mario Blaum Roy D. Cideciyan Evangelos Eleftheriou Rick Galbraith Ksenija Lakovic Thomas Mittelholzer Travis Oenning Bruce Wilson Hitachi Global Storage Technologies San Jose CA USA IBM Zurich Research Laboratory Rüschlikon Switzerland Hitachi Global Storage Technologies Inc. Rochester MN USA Hitachi Global Storage Technologies Rochester MN USA

ISBN: (纸本)9781424413973;1424413974

A reverse concatenation scheme based on an efficient modulation encoder satisfying non-uniform constraints, a systematic Reed-Solomon encoder and a partial symbol interleaver is presented. This architecture achieves very tight modulation constraints and minimizes error propagation and rate loss. The modulation constraints considered are of the same type as the constraints that have been used in generalized partial-response maximum-likelihood (PRML) detection systems. A class of codes that is based on serial concatenation of a prefix-constrained code and two interleaved enumerative codes with non-uniform constraints is proposed. Specific rate-199/200 PRML(G, I) codes are constructed.

关键词： Encoding modulation coding Detectors Maximum likelihood detection Interleaved codes Maximum likelihood decoding Error correction codes Reed-Solomon codes Magnetic modulators Laboratories

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Antenna Selection, Diversity coding and Spatial Multiplexing in Cooperative Wireless Networks

Antenna Selection, Diversity Coding and Spatial Multiplexing...

引用

Asilomar Conference on Signals, Systems & Computers

作者： Ozgur Oyman Feng Xue Intel Research USA

We propose novel antenna selection and link adaptive space- time modulation algorithms to support cooperative wireless networks composed of access points and user devices with multi-antenna elements. Well-known point-to-point multiple-input multiple-output (MIMO) antenna selection and link adaptation algorithms are extended, with slight modifications, to be applicable over a cooperative wireless network architecture; in which multiple transmitters are simultaneously communicating with a destination terminal. For these algorithms, a criterion based on the minimum Euclidean distance metric is used to select antennas and spatial modes (cooperative diversity and cooperative multiplexing) following the estimation of the instantaneous channel state and its feedback over a low-bandwidth feedback channel. Finally, we will present numerical results to empirically validate that our cooperative antenna selection and link adaptation algorithms yield almost equivalent performance to that achieved by MIMO antenna selection and link adaptation algorithms.

关键词： Wireless networks MIMO Signal processing algorithms Adaptive arrays Transmitters Wireless sensor networks Transmitting antennas State feedback Bandwidth modulation coding

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Structured Lattice Space-Time Trellis Coded modulation

Structured Lattice Space-Time Trellis Coded Modulation

引用

IEEE International Symposium on Information Theory

作者： K. Raj Kumar Giuseppe Caire EE Dept University of Southern California Los Angeles CA USA

ISBN: (纸本)9781424413973

This paper addresses the issue of the design of Space-Time (ST) codes for long block-lengths that have good coding gain and minimal decoding complexity. A general technique to encode information onto cosets and points of a sequence of nested lattices is used to construct ST trellis coded modulation (TCM) schemes with good coding and shaping gains, and is termed as structured lattice space-time trellis coded modulation (S-LaST TCM). These codes permit low complexity minimum mean-squared error generalized decision feedback equalizer (MMSE-GDFE) lattice decoding. Code construction examples are presented, and simulation results reveal excellent performances.

关键词： Lattices modulation coding Decoding Signal to noise ratio OFDM modulation MIMO Algebra Decision feedback equalizers Frequency Fading

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Space-time codes with controllable ML decoding complexity for any number of transmit antennas

Space-time codes with controllable ML decoding complexity fo...

引用

IEEE International Symposium on Information Theory

作者： Naresh Sharma Pavan R. Pinnamraju Constantinos B. Papadias Tata Institute of Fundamental Research Mumbai India Indian Institute of Technology New Delhi India Athens Information Technology Center Athens Greece

ISBN: (纸本)9781424413973;1424413974

We construct a class of linear space-time block codes for any number of transmit antennas that have controllable ML decoding complexity with a maximum rate of 1 symbol per channel use. The decoding complexity for M transmit antennas can be varied from ML decoding of 2 lceillog2 Mrceil-1 symbols together to single symbol ML decoding. For ML decoding of 2 lceillog2 Mrceil-n (n = 1,2,hellip) symbols together, a diversity of min(M, 2 lceillog2 Mrceil-n+1 ) can be achieved. Numerical results show that the performance of the constructed code when 2 lceillog2 Mrceil-1 symbols are decoded together is quite close to the performance of ideal rate-1 orthogonal codes (that are non-existent for more than 2 transmit antennas).

关键词： Space time codes Decoding Transmitting antennas Block codes Symmetric matrices Space technology Information technology Bandwidth Receiving antennas modulation coding

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Ultrasonic Imaging Detective System Based on Spread Spectrum Technology

Ultrasonic Imaging Detective System Based on Spread Spectrum...

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International Conference on Wireless Communications, Networking and Mobile Computing (WiCom)

作者： Lina Cao Yinjing Guo Wenhong Lu Mingyuan Yao Zhengjie Wang Hongyu Sun College of Information and Electrical Engineering Shandong University of Science and TechnologyQingdao China

In this paper introduce spared spectrum technology into ultrasonic imaging. Analyze how to modulate ultrasonic with the spread spectrum technology, introduce imagining restoration method, and then use this technology to detective the structure of five mine wells. Firstly, use pseudorandom codes to modulate ultrasonic signal before it is sent out, and then demodulate echo to obtain the time difference. Secondly, apply gradual linear iterative method and QR decomposition of least squares method to restore image. Analyze the image with computer we can obtain the structure of objects. Experiment verified introduce spared spectrum technology into ultrasonic imaging can improve the resolution and accuracy.

关键词： Ultrasonic imaging Spread spectrum communication Image analysis Image restoration Ultrasonic variables measurement modulation coding Equations Image resolution Signal resolution Ultrasonic transducers

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On the Acquisition Ambiguity for Galileo BOC(n,n) Modulated Signals

On the Acquisition Ambiguity for Galileo BOC(n,n) Modulated ...

引用

IEEE International Conference on Communications (ICC)

作者： G. Avellone M. Frazzetto E. Messina Advanced Systems Technology STMicroelectronics Catania Italy

Binary offset carrier, BOC, modulated signals are at the moment candidates both for new civil (free) signal in GPS update and for part of the European Global Navigation Satellite System (GNSS) Galileo. They present better multipath mitigation and, potentially, better tracking characteristic but they have a multiple peak autocorrelation function. These secondary peaks could introduce problems both in acquisition and tracking stage, when usual approaches are employed at the receiver. Several possible strategies for mitigating lock ambiguities in acquisition and tracking, related to secondary peaks, have been presented in the past for BOC modulated signals. In this contribution we focus our attention on BOC(n,n) modulated signal, and analyze in detail the acquisition ambiguity problem versus the acquisition approach. We also present performance comparison (detection probability, probability of lock on secondary auto-correlation peaks) considering several test variables for the acquisition process. All the results are presented for the L1 Galileo signal format.

关键词： Testing Global Positioning System Autocorrelation Signal synthesis Satellite navigation systems Signal analysis modulation coding Performance analysis Performance evaluation Communications Society

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Bit-Interleaved Coded modulation for the Relay Channel Using Bilayer LDPC Codes

Bit-Interleaved Coded Modulation for the Relay Channel Using...

引用

Canadian Workshop on Information Theory (CWIT)

作者： Peyman Razaghi Marko Aleksic Wei Yu Department of Electrical and Computer Engineering University of Toronto Canada

This paper describes a coding scheme for approaching the maximum theoretical decode-and-forward rate for the relay channel in the high signal-to-noise ratio (SNR) regime. The proposed scheme is based on a concatenation of bit-interleaved coded modulation (BICM) and a specially designed bilayer low-density parity-check (BLDPC) code that works simultaneously at two different SNRs. It is shown that the proposed BICM-BLDPC scheme provides a close-to-optimal performance for the relay channel at high SNRs, with a gap of 0.5 dB to the theoretical limit, at a bit error rate of 10 -1 .

关键词： Interleaved codes modulation coding Parity check codes Digital relays Decoding Bit error rate Quadrature amplitude modulation Signal to noise ratio Turbo codes Labeling

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