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检索条件"主题词=Modulation Coding"

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EXIT chart analysis of iteratively detected and SVD-assisted broadband MIMO-BICM schemes

EXIT chart analysis of iteratively detected and SVD-assisted...

引用

International Conference on Microwaves, Radar and Wireless Communications

作者： César Benavente-Peces Andreas Ahrens E.U.I.T de Telecomunicación Universidad Politécnica de Madrid Madrid Spain Business and Design Department of Electrical Engineering and Computer Science Hochschule Wismar University of Technology Wismar Germany

In this contribution the number of activated MIMO layers and the number of bits per symbol are jointly optimized under the constraint of a given fixed data throughput and integrity. In general, non-frequency selective MIMO links have attracted a lot of research and have reached a state of maturity. By contrast, frequency selective MIMO links require substantial further research, where spatio-temporal vector coding (STVC) introduced by Raleigh seems to be an appropriate candidate for broadband transmission channels. In analogy to bit-interleaved coded irregular modulation, a broadband MIMO-BICM scheme is introduced, where different signal constellations and mappings are used within a single codeword. Extrinsic Information Transfer (EXIT) charts are used for analyzing and optimizing the convergence behaviour of the iterative demapping and decoding. Our results show that in order to achieve the best bit-error rate, not necessarily all MIMO layers have to be activated.

关键词： MIMO Constraint optimization Throughput Frequency Interleaved codes modulation coding Constellation diagram Signal mapping Information analysis Convergence

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LDPC codes for rank modulation in flash memories

LDPC codes for rank modulation in flash memories

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IEEE International Symposium on Information Theory

作者： Fan Zhang Henry D. Pfister Anxiao Jiang Electrical and Computer Engineering Department Texas A and M University College Station TX USA Computer Science and Engineering Department Texas A and M University College Station TX USA

ISBN: (纸本)9781424478903;9781424469604

An LDPC code is proposed for flash memories based on rank modulation. In contrast to previous approaches, this enables the use of long ECCs with fixed-length modulation codes. For ECC design, the rank modulation scheme is treated as part of an equivalent channel. A probabilistic model of the equivalent channel is derived and a simple high-SNR approximation is given. LDPC codes over integer rings and finite fields are designed for the approximate channel and a low-complexity symbol-flipping verification-based (SFVB) message-passing decoding algorithm is proposed to take advantage of the channel structure. Density evolution (DE) is used to calculate decoding thresholds and simulations are used to compare the low-complexity decoder with sum-product decoding.

关键词： Parity check codes modulation coding Flash memory Decoding Error correction codes Nonvolatile memory Algorithm design and analysis Tunneling Computer science Galois fields

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Some aspects regarding radio resources management in multi-antenna systems

Some aspects regarding radio resources management in multi-a...

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Conference on Microwave Techniques, COMITE

作者： Ancuţa Moldovan Tudor Palade Irina Vermeşan Rebeca Colda Ana-Maria Piştea Dept. of Communications Technical University of Cluj-Napoca Cluj-Napoca Romania

In this paper, multi-antennas transmission techniques, based on spatial multiplexing and space diversity, are considered as means to enhance the performance of WLANs systems. Link adaptation is introduce in order to determine the most appropriate PHY configuration in terms of achievable throughput and error performance, for different configuration of transmit and receive antennas, modulation scheme and coding rates. The physical layer parameters selection is done according to the application requirements, in the attempt to efficiently use the available radio resources.

关键词： Resource management Physical layer Throughput MIMO Receiving antennas Wireless LAN modulation coding Error analysis Wireless communication Transmitters

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Research and Simulation of PPM modulation and Demodulation System on Spatial Wireless Optical Communication

Research and Simulation of PPM Modulation and Demodulation S...

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Photonics and Optoelectronics, SOPO

作者： Xuan Fu Guifen Chen Tingting Tang Yunguo Zhao Peng Wang Yuhuan Zhang Shenyang Inst. of Eng. Shenyang China Changchun Univ. of Sci. & Technol. Changchun China

For the development of the information age, it needs to establish high transmission rate, great information, wide covering space communication network systems. The space-satellite communication using the extremely short wave length light wave is the best plan to realize the high code rate communication. High code rate modulation is one of the key technologies to realize free-space optical communication system. The free-space optical communication system wants to realize high-power and wide range of communication which requires high-rate modulation laser transmitter. PPM (Pulse Position modulation) has been widely used in free-space optical communication system because of its advantages such as high power efficiency, transmission efficiency and strong anti-jamming capability.

关键词： Demodulation Wireless communication Optical fiber communication Space technology Pulse modulation Communication networks Ultraviolet sources modulation coding Optical transmitters Optical pulses

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Downlink Transmission in Multi-Carrier Systems with Reduced Feedback

Downlink Transmission in Multi-Carrier Systems with Reduced ...

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IEEE Conference on Vehicular Technology (VTC)

作者： Yuanye Wang Klaus I. Pedersen Troels B. Sorensen Preben E. Mogensen University of Aalborg Aalborg Denmark

in this paper we address the problem of reducing the feedback for the downlink transmission in multi-carrier systems. In these systems multiple Component Carriers (CCs) are aggregated together to form a wide spectrum. Consequently, a large feedback overhead is required to report the channel quality information over such a wide bandwidth. We first generalize two existing feedback reduction techniques, and then propose a new one. These techniques use different feedback schemes across the CCs, or allow some CCs to be un-reported, for the purpose of reducing the amount of feedback. Performance for the investigated techniques is evaluated in a realistic system setting with different traffic conditions and terminal categories. Based on the obtained results, the selection of proper feedback reduction technique under different load conditions can be made. The findings are useful for reducing the feedback overhead in future generation wireless communication systems that operate over multiple CCs.

关键词： Downlink Feedback Throughput Automatic repeat request Protocols modulation coding Error analysis Channel estimation Transmitters Genetic expression

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A Noncoherent Coded MPSK Scheme with Near-Capacity Performance for Channels with Fast Phase Variation

A Noncoherent Coded MPSK Scheme with Near-Capacity Performan...

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IEEE Conference on Vehicular Technology (VTC)

作者： Yen-Ming Chen Yeong-Luh Ueng Ying-Chen Chao Department of Electrical Engineering National Tsing Hua University Hsinchu Taiwan

In this paper, we propose to approach the capacity limit for channels with fast phase variation by using a serial concatenation scheme with an outer turbo encoder and an inner block modulator. A distinct feature of the proposed transmission scheme is that coded symbols from adjacent codewords are interleaved into the same input vectors of the block modulator. At the receiver, we not only perform the iterative noncoherent demodulation and decoding algorithm, but also exchange extrinsic information between adjacent codewords due to the codeword interleaved structure. It is shown through the extrinsic information transfer (EXIT) chart that the resultant block demodulator and channel decoder can match well with each other, and can achieve a near-capacity performance.

关键词： Demodulation Iterative decoding modulation coding Transmitters Maximum likelihood decoding AWGN channels Parity check codes Coherence Gaussian noise Phase modulation

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Combining of Forward and Backward Multiple-Symbol Differential Sphere Decoding for Turbo Coded System

Combining of Forward and Backward Multiple-Symbol Differenti...

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IEEE Conference on Vehicular Technology (VTC)

作者： Ching-Chi Lo Szu-Lin Su Telecom Technology Center Kaohsiung County Taiwan R.O.C Department of Electrical Engineering National Cheng Kung University Tainan City Taiwan R.O.C

Abstract-It is known that multiple-symbol differential detection can enhance the performance of coded differential phase shift keying (DPSK) systems over a correlated flat fading channel, but have exponential complexity. In this paper, the proposed scheme, Forward/Backward-MSDSD (FB-MSDSD), consisted of MAP-MSDSD, channel estimation and soft demodulation can reduce the complexity by dividing the original detection interval into forward and backward processes. The simulation runs show that compared with SISO MSDSD scheme, the proposed scheme has similar bit error rate but lower complexity.

关键词： Turbo codes Demodulation Iterative decoding Detectors Channel estimation Space technology modulation coding Bit error rate Differential quadrature phase shift keying Fading

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IPTV over satellite with Adaptive and Variable coding and modulation

IPTV over satellite with Adaptive and Variable Coding and Mo...

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International Symposium on Communications and Information Technologies (ISCIT)

作者： NamKyung Lee Hyun Woo Lee Won Ryu Electronics and Telecommunications Research Institute DaeJeon Korea Electronics and Telecommunications Research Institute Daejeon Daejeon KR

ISBN: (纸本)9781424445219

In this paper, we tried to use satellite link for providing IPTV services. The common satellite link uses fixed-size packets as MPEG-2 TS which has much redundancy. If a satellite communication system support IPTV, it must adopt ACM/VCM(ACM, adaptive coding and modulation, VCM, variable coding and modulation) mode for reducing fixed size packet redundancies. This paper describes the requirements for IPTV service using satellite communication systems.

关键词： IPTV Satellites modulation coding

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Distributed Space-Time 4CPFSK Trellis Codes for Amplify & Forward Relaying

Distributed Space-Time 4CPFSK Trellis Codes for Amplify & Fo...

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International Conference on Communication Theory, Reliability, and Quality of Service, CTRQ

作者： Ali Serdar Demiroglu Ibrahim Altunbas Mehmet Ertugrul Çelebi Technology Development Department Nortel Netaş Istanbul Türkiye Electronics & Communication Department Istanbul Technical University Istanbul Türkiye

Continuous phase frequency shift keying is a power/bandwidth efficient modulation technique, hence, attractive for use in relay/cooperative systems employing inexpensive nonlinear power amplifiers. We investigate optimum distributed space-time 4-ary continuous phase frequency shift keying trellis codes for amplify & forward relaying method and propose novel codes for relay transmission systems. The error performances of the classical and novel codes are investigated for one and two-relay systems using various transmission protocols.

关键词： Convolutional codes Relays Power system relaying Continuous phase modulation Frequency shift keying modulation coding Cooperative systems Transmitting antennas Power system reliability Fading

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Codes in permutations and error correction for rank modulation

Codes in permutations and error correction for rank modulati...

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IEEE International Symposium on Information Theory

作者： Alexander Barg Arya Mazumdar Department of ECE and Institute for Systems Research University of Maryland College Park USA Dobrushin Mathematical Laboratory Institute for Problems of Information Transmission Russian Academy of Science Moscow Russia

Codes for rank modulation have been recently proposed as a means of protecting flash memory devices from errors. We study basic coding theoretic problems for such codes, representing them as subsets of the set of permutations of n elements equipped with the Kendall tau distance. We derive several lower and upper bounds on the size of codes. These bounds enable us to establish the exact scaling of the size of optimal codes for large values of n. We also show the existence of codes whose size is within a constant factor of the sphere packing bound for any fixed number of errors.

关键词： Error correction codes modulation coding Tin Flash memory Hamming distance Protection Upper bound Statistics Aging Writing

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