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Codeword Metric Calculation scheme for Outer Code in Overloaded MIMO-OFDM System 81

Codeword Metric Calculation Scheme for Outer Code in Overloa...

引用

81st IEEE Vehicular Technology Conference (VTC Spring)

作者： Doi, Yoshihito Sanada, Yukitoshi Keio Univ Dept Elect & Elect Engn Yokohama Kanagawa 223 Japan

ISBN: (纸本)9781479980888

This paper presents a codeword metric calculation scheme in two step joint decoding of block coded signals in an overloaded multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) system. In the previous literature, the two step joint decoding scheme has been proposed for the complexity reduction of joint maximum likelihood decoding in the overloaded MIMO system. However, the two step decoding scheme has not been combined with an outer code. The selection of the candidate codewords in the inner block code may not always be able to provide the metric of a binary coded symbol for the outer code. The metric of the binary coded symbol calculated in the first stage is used in the proposed scheme. It is shown that the proposed two step decoding scheme shows better performance than a bit flipping based scheme and reduces the complexity by about 0.013 for 4 signal streams with the cost of bit error rate degradation within 0.5dB.

关键词： computational scheme multiple input multiple output systems decoding scheme Metric Metronidazole Bit error rate codeword Codes maximum likelihood decoding Orthogonal frequency division multiplexing

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Achieving the Han-Kobayashi inner bound for the quantum interference channel 2012

Achieving the Han-Kobayashi inner bound for the quantum inte...

引用

IEEE International Symposium on Information Theory

作者： Sen, Pranab Tata Inst Fundamental Res Sch Technol & Comp Sci Mumbai 400005 Maharashtra India

ISBN: (纸本)9781467325790

We construct an encoding and decoding scheme achieving the Chong-Motani-Garg inner bound [1] for a two sender two receiver interference channel with classical input and quantum output. This automatically gives a similar inner bound for sending classical information through an interference channel with quantum inputs and outputs without entanglement assistance. Our result matches the best known inner bound for the interference channel in the classical setting. Achieving the Chong-Motani-Garg inner bound, which is known to be equivalent to the Han-Kobayashi inner bound [3], answers an open question raised recently by Fawzi et al. [4]. Our encoding strategy is the standard random encoding strategy. Our decoding strategy is a sequential strategy where a receiver loops through all candidate messages trying to project the received state onto a 'typical' subspace for the candidate message under consideration, stopping if the projection succeeds for a message, which is then declared as the guess of the receiver for the sent message. On the way to our main result, we show that random encoding and sequential decoding strategies suffice to achieve rates up to the mutual information for a single sender single receiver channel, and the standard inner bound for a two sender single receiver multiple access channel, for channels with classical input and quantum output. Besides conceptual simplicity, a sequential decoding strategy is space efficient, and may have additional efficiency advantages in some settings. We prove our inner bounds using two new technical tools-a non-commutative union bound to analyse the decoding error probability, and a geometric notion of approximate interesection of two conditionally typical subspaces.

关键词： sequential decoding Guess Interference channels decoding scheme Error probability quanta encoding strategy Bound Receivers

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Memory Sharing Techniques for Multi-standard High-throughput FEC Decoder 14

Memory Sharing Techniques for Multi-standard High-throughput...

引用

International Conference on Embedded Computer Systems - Architectures, Modeling, and Simulation (SAMOS)

作者： Wu, Zhenzhi Liu, Dake Beijing Inst Technol Sch Informat & Elect Beijing 100081 Peoples R China Linkoping Univ Dept Elect Engn SE-58183 Linkoping Sweden

ISBN: (纸本)9781479937707

Nowadays multi-standard wireless baseband, Convolutional Code (CC), Turbo code and LDPC code are widely applied and need to be integrated within one FEC module. Since memory occupies half or even more area of the decoder, memory sharing techniques for area saving purpose is valuable to consider. In this work, several memory merging techniques are proposed. A non-conflict access technique for merged path metric buffer is proposed. The results show that 41% of total memory bits are saved when integrating three different decoding schemes including CC (802.11a/g/n), LDPC (802.11n and 802.16e) and Turbo (3GPP-LTE). Synthesis result with 65nm process shows that the merged memory blocks consume merely 1.06mm(2) of the chip area.

关键词： low density parity check codes memory block FEC Regimen decoders Memory Memory Access to technology decoding scheme

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Color image encryption using TSRSC associated with DWT 5

Color image encryption using TSRSC associated with DWT

引用

5th International Conference on Confluence - The Next Generation Information Technology Summit (Confluence)

作者： Singh, Abhishek Banaras Hindu Univ Fac Sci DST Ctr Interdisciplinary Math Sci Varanasi 221005 Uttar Pradesh India

ISBN: (纸本)9781479942367

With an abridged introductory note on the discrete wavelet transform (DWT) and random shift cipher (RSC), this paper attempts to study a technique for color image encoding and decoding scheme using two stage random shift cipher (TSRSC) associated with DWT. In this approach, keys and the arrangement of RSC parameters are compulsory. The formula for total number of keys in encoding process of color image is given. The capability of this proposed technique can be analyse by conclusion.

关键词： Ciphers Color decoding Discrete wavelet transforms Encoding Encryption Image coding discrete wavelet transform cryptography image coding color image decoding Passwords Keys Keys Cays decoding scheme coding Cipher

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A Novel Circuit to Optimize Access Time and decoding schemes in Memories

A Novel Circuit to Optimize Access Time and Decoding Schemes...

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International Conference on VLSI Design

作者： Sanjeev Kumar Jain Krishna Srivastva Sanjiv Kainth R&D group Virage Logic

ISBN: (纸本)9781424455416

As the microprocessor speed increases from 500MHz to IGHz and beyond, SOC designers are forced to innovate new schemes in their use of cache memory for high speed access. In this paper, clock to wordline path delay is optimized using a novel circuit design technique. Using this novel circuit, clock to word line path delay is optimized by 2.5 times at worst case corner. For a typical memory instance frequently used in cache memories) whose access time is of the order of 800ps and where read and write operation occurs in the same clock cycle, overall access time is improved by 18% at worst case corner. For this case, write margin is improved by 2.26 times at worst case corner for write operation. A decoding scheme is also discussed in this paper which describes how to choose the best pre-decoding and post-decoding schemes based on minimum pre-decoded lines, minimum stack size in post decoder and maximum granularity of x-decoders.

关键词： Storage access times write operation corners decoding scheme design techniques clock cycle decoders Memory Cache memory

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An Enhanced Fruit Fly Optimization for the Flexible Job Shop Scheduling Problem with Lot Streaming

An Enhanced Fruit Fly Optimization for the Flexible Job Shop...

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第37届中国控制会议

作者： Tao Meng Jun-hua Duan Quan-ke Pan Qing-da Chen Ju-tao Guo School of Mechatronic Engineering and Automation Shanghai University School of Mathematical Science Liaocheng University Computer Center Shanghai University State Key Laboratory of Synthetic Automation for process Industries Northeastern University Shanghai Spaceflight Precision Machinery Institute

In this work, we propose an enhanced fruit fly optimization（En FFO） to solve the flexible job shop scheduling problem with the consideration of lot streaming, the criterion of which is total flowtime minimization. In En FFO, the multi-swarm scheme is utilized to balance the exploitation and exploration ability. To better match the two sub-problems in FJSP, we introduce new solution representation and decoding scheme. In addition, considering characteristics of multi-swarm FFO and FJSP, adaptive search scheme and information interaction tactics are presented to strengthen search performance of the algorithm. Finally, comparisons with recent algorithms verify the superiority of the proposed En FFO for the considered problem.

关键词： Fruit Fly Optimization Flexible Job Shop Scheduling Lot Streaming Total Flowtime decoding scheme

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Physical-Layer Network Coding in Coded OFDM Systems with Multiple-Antenna Relay

Physical-Layer Network Coding in Coded OFDM Systems with Mul...

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IEEE Vehicular Technology Conference

作者： Meng Wu Dirk Wiibben Armin Dekorsy Department of Communications Engineering Otto-Hahn-Allee 1 University of Bremen 28359 Bremen Germany

ISBN: (纸本)9781467363365

In this paper physical layer network coding (PLNC) in two-phase two-way relaying networks using coded orthogonal frequency division multiplexing (OFDM) transmission is investigated. After receiving the superimposed signal from both sources, the relay estimates the XOR-based network coded signal, which is broadcast back to the sources. Assuming that the relay is equipped with multiple antennas, the uplink transmission forms a multiple-input multiple-output (MIMO) system, which allows the application of MIMO detection technologies. To this end, the impact of employing multiple antennas at the relay on different detection and decoding schemes under investigations is studied and compared with respect to mutual information (MI). Numerical simulations verify our theoretical analysis.

关键词： PLNC OFDM MIMO Orthogonal frequency division multiplexing multiple input multiple output systems relay multiple antenna hierarchical network Physical layer decoding scheme Network coding

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Remote estimation subject to packet loss and quantization noise

Remote estimation subject to packet loss and quantization no...

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IEEE Annual Conference on Decision and Control

作者： S. Dey A. Chiuso L. Schenato Dept. of Electrical & Electronic Engineering The University of Melbourne Parkville VIC 3052 Australia Department of Information Engineering University of Padova Via Gradenigo 6/b 35131 Padova Italy

ISBN: (纸本)9781467357159

In this paper we consider the problem of designing coding and decoding schemes to estimate the state of a scalar stable stochastic linear system in the presence of a wireless communication channel between the sensor and the estimator. In particular, we consider a communication channel which is prone to packet loss and includes quantization noise due to its limited capacity. We study two scenarios: the first with channel feedback and the second with no channel feedback. More specifically, in the first scenario the transmitter is aware of the quantization noise and the packet loss history of the channel, while in the second scenario the transmitter is aware of the quantization noise only. We show that in the first scenario, the optimal strategy among all possible linear encoders corresponds to the transmission of the Kalman filter innovation similarly to the differential pulse-code modulation (DPCM). In the second scenario, we show that there is a critical packet loss probability above which it is better to transmit the state rather than the innovation. We also propose a heuristic strategy based on the transmission of a convex combination of the state and the Kalman filter innovation which is shown to provide a performance close to the one obtained with channel feedback.

关键词： quantization noise Packet loss differential pulse code modulation Technological Innovations Awareness decoding scheme optimal strategy

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An efficient decoding implementation of PCGC with lower error floor

An efficient decoding implementation of PCGC with lower erro...

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IET 8th International Conference on Wireless, Mobile &Multimedia Networks

作者： Hui Xue Lijun Zhang School of Electronics and Information Engineering Beijing Jiaotong University Beijing China

Parallel Concatenated Gallager codes usually has error floor phenomenon due to insufficient use of extrinsic information. We propose an effective serial decoding scheme to lower error floor of component LDPC codes thr... 详细信息

ISBN: (纸本)9781839531637

关键词： PARALLEL CONCATENATTED ERROR FLOOR LDPC CODES PEG error floor DOWEL Polyethylene Glycols decoding Simulation results Codes low density parity check codes decoding scheme

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LT Network Codes

LT Network Codes

引用

IEEE International Conference on Distributed Computing Systems

作者： Mary-Luc Champel Kevin Huguenin Anne-Marie Kermarrec Nicolas Le Scouarnec Technicolor FRISA/Universite de Rennes 1 INRIA Rennes - Bretagne Atlantique

ISBN: (纸本)9781424472611;9780769540597

Network coding has been successfully applied in large-scale content dissemination systems. While network codes provide optimal throughput, its current forms suffer from a high decoding complexity. This is an issue when applied to systems composed of nodes with low processing capabilities, such as sensor networks. In this paper, we propose a novel network coding approach based on LT codes, initially introduced in the context of erasure coding. Our coding scheme, called LTNC, fully benefits from the low complexity of belief propagation decoding. Yet, such decoding schemes are extremely sensitive to statistical properties of the code. Maintaining such properties in a fully decentralized way with only a subset of encoded data is challenging. This is precisely what the recoding algorithms of LTNC achieve. We evaluate LTNC against random linear network codes in an epidemic content-dissemination application. Results show that LTNC increases communication overhead (20%) and convergence time (30%) but greatly reduces the decoding complexity (99%) when compared to random linear network codes. In addition, LTNC consistently outperforms dissemination protocols without codes, thus preserving the benefit of coding.

关键词： Network Code Codes Level Trigger Network coding decoding scheme encode data Linear networks Belief propagation decoding labeling scheme

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