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检索条件"主题词=modulation coding"

共 7024 条记录，以下是211-220 订阅

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Compressed Rank modulation

Compressed Rank Modulation

引用

50th Annual Allerton Conference on Communication, Control, and Computing (Allerton)

作者： Li, Qing Texas A&M Univ College Stn TX 77840 USA

ISBN: (纸本)9781467345392;9781467345378

We propose a generalization of Rank modulation (RM) scheme, Compressed Rank modulation (CRM) scheme for nonvolatile memories. CRM stores information in the multiset permutation induced by the charge levels of N = Sigma(n)(i=1) m(i) cells: set the ranks of the first m(1) highest charge level cells as 1, the ranks of the next m(2) highest charge level cells are 2, and the ranks of the last m(n) highest charge level cells are n. The only allowed charge-placement method is the minimal-push-up aiming to minimize the increase of highest charge levels, and such minimization of highest charge level increase is defined as rewriting cost. CRM achieves a higher capacity comparing with RM, and maintains its advantages meanwhile. The closed-form formula for rewriting cost, sizes of balls, asymptotical rate analysis for rewriting codes, and one rewriting code construction are presented.

关键词： modulation coding random-access storage

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Rank modulation for Translocation Error Correction 2012

Rank Modulation for Translocation Error Correction

引用

IEEE International Symposium on Information Theory

作者： Farnoud (Hassanzadeh), Farzad Skachek, Vitaly Milenkovic, Olgica UIUC Dept Elect & Comp Engn Urbana IL 61801 USA McGill Univ Dept Elect & Comp Engn Montreal PQ H3A 2A7 Canada

ISBN: (纸本)9781467325790

We consider rank modulation codes for flash memories that allow for handling arbitrary charge drop errors. Unlike classical rank modulation codes used for correcting errors that manifest themselves as swaps of two adjacently ranked elements, the proposed translocation codes account for more general forms of errors that arise in storage systems. Translocations represent a natural extension of the notion of adjacent transpositions and as such may be analyzed using related concepts in combinatorics and rank modulation coding. Our results include deriving the asymptotic capacity of translocation rank codes, construction techniques for asymptotically good codes and a simple decoding algorithm.

关键词： Rank of data modulation coding Chromosome Translocation Codes construction technology flash memories Combinatorics error correction TRANSLOCATION translocation Static form errors profile error

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Noncoherent UWB with Block Coded modulation in Cooperative Communications Systems

Noncoherent UWB with Block Coded Modulation in Cooperative C...

引用

IEEE 16th International Symposium on Consumer Electronics (ISCE)

作者： Wu, Tsan-Ming Hou, Yi-Fang Chung Yuan Christian Univ Dept Elect Engn Chungli 32023 Taiwan

ISBN: (纸本)9781467313568

Recently, the concept of the cooperative communications has been applied extensively for the ultra-wideband (UWB) system. In this paper, the cooperative scheme of the noncoherent UWB impulse radio system with block-coded modulation (BCM) having a codeword matching and signal aggregation (CMSA) detection is discussed under different fading environments, which has not been studied yet. To enlarge the operation range of the USB system, the amplify-and-forward scheme is used as a relay protocol to re-transmit signals from source to destination. Simulation results illustrate that the proposed method performs better than that without a cooperative scheme over the Nakagami-m fading channel.

关键词： COMMUNICATION SYSTEMS Ultra wideband technologies operating range noncoherent modulation coding

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Achievable Information Rates for Nonlinear Satellite Channels in Unidirectional and Bidirectional Relaying

Achievable Information Rates for Nonlinear Satellite Channel...

引用

IEEE Latin-American Conference on Communications (LATINCOM)

作者： Xu, Chenguang Peng, John Wilson, Stephen G. Berger, Toby Univ Virginia Dept Elect & Comp Engn Charlottesville VA 22904 USA

ISBN: (纸本)9781467350808;9781467350792

With an eye toward coded transmission of high-level modulation on satellite links, we study the information-theoretic potential of nonlinear satellite channels, for both single-user per transponder operation and simultaneous two-way, on-frequency relaying to improve spectrum efficiency as much as 100%. We develop an analytic nonlinear model with finite memory for these two scenarios, and compute achievable rate regions, i.e. information rates that are arbitrarily reliable, as a function of link SNR's and input backoff of the nonlinear amplifier. This provides guidance on required SNR and desired amplifier operating point for advanced coded modulation schemes.

关键词： amplifiers modulation coding satellite links

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Receiver Rate Adaptation for MIMO System

Receiver Rate Adaptation for MIMO System

引用

IEEE International Conference on Communications (ICC)

作者： Cui, Hao Chen, Chang Wen SUNY Buffalo Dept CSE Buffalo NY 14260 USA

ISBN: (纸本)9781457720536

This paper presents a novel design of linear random space time coding (LRSTC) scheme. This scheme is able to achieve the dual benefits for MIMO receiver rate adaptation: (1) rateless coding and modulation and (2) approximately universal tradeoff between diversity gain and multiplexing gain. In this scheme, an LRSTC symbol is the superposition of a block of randomly rotated QPSK symbols. Such superposition generates a dense constellation that ensures a high saturation rate. The random rotation guarantees the pseudo-orthogonality between QPSK symbols. Through utilizing the orthogonality of symbols, a power gain can be generated at receiver end. The power gain can be increased by transmitting more LRSTC symbols to the receiver in order to resist stronger noise of the MIMO system. Therefore, the rate can be seamlessly adapted through varying the number of transmitted symbols rather than the adopting conventional strategies in terms of modulation, coding and antenna selection. Moreover, the transmission of LRSTC symbols will span over all of the transmit antennas which allows the spatial diversity to be fully exploited. When the rank of MIMO matrix is greater than 1, more linear independent symbols can be received in each time slot. Hence, multiplexing gain can also be achieved. We have carried out both analysis and simulations to verify this LRSTC design. The simulation results show that LRSTC not only achieves the throughput comparable with the ideal conventional rate adaptation, but also accomplishes a seamless switching between diversity and multiplexing gain.

关键词： multiple input multiple output systems Power gain rate adaptive Signs and symbols Receivers transmitting antennas modulation coding MULTIPLEXOR spatial diversity Simulation results Gain Diversity methods

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LDPC Coded modulation for Rayleigh Fading Channels

LDPC Coded Modulation for Rayleigh Fading Channels

引用

4th International Conference on Wireless Communications and Signal Processing (WCSP)

作者： Li, Jintao Yang, YiBin Yu, Hui Guan, Yunfeng Shanghai Jiao Tong Univ Sch Elect & Elect Engn Shanghai 200030 Peoples R China

ISBN: (纸本)9781467358293;9781467358309

This paper presents a novel scheme of low-densityparity- check (LDPC) coded modulation system called bit-expandinterleaved coded modulation with iterative decoding and demapping (BEICM-ID) over Rayleigh fading channels. In traditional bit-interleaved coded modulation (BICM) schemes and its iterative version, BICM-ID, each bit node is mapped into one single symbol, but in our new BEICM-ID scheme some bit nodes may map into multi symbols, thus diversity is achieved, and since iterative decoding and demapping is used, more mutual information will exchange among bit nodes, check nodes and symbol nodes which may further improve the total error correcting ability. Compared to the BICM and BICM-ID schemes, the proposed coded modulation scheme can achieve a performance gain with different modulation types under Rayleigh fading channels, with 256qam modulation the gain over BICM is about 1.5dB and the gain over BICM-ID is about 0.75dB.

关键词： Raleigh fading channels modulation coding low density parity check codes modulation type Iterative decoding Ganglia Gain Binary digits

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Hybrid FSO/RF Symbol Mappings: Merging High Speed FSO with Low Speed RF through BICM-ID

Hybrid FSO/RF Symbol Mappings: Merging High Speed FSO with L...

引用

IEEE Global Communications Conference (GLOBECOM)

作者： Kumar, Kuldeep Borah, Deva K. New Mexico State Univ Klipsch Sch Elect & Comp Engn Las Cruces NM 88003 USA

ISBN: (纸本)9781467309219;9781467309202

In this paper, we investigate designing of hybrid free space optical (FSO)/radio frequency (RF) symbol mappers using bit-interleaved coded modulation with iterative decoding (BICM-ID) with asymmetric data rates between the FSO and the RF links. Data bits are first encoded with a channel code and the coded bits after an interleaver are mapped to hybrid FSO/RF symbols instead of separate conventional RF symbols and on-off keyed FSO transmissions. Iterative decoding is used at the receiver. An orthogonal evolutionary (OE) algorithm to obtain optimal symbol mappings is used. Two cost functions to be used in the OE algorithm are proposed. For high signal-to-noise ratio (SNR) regime, analytical error bound expressions are used and at the low SNR regime, extrinsic information transfer (EXIT) chart is used for the cost function. The proposed mappings achieve significant gains over conventional mappings. For a hybrid FSO/RF link with an FSO and RF channel use ratio of 10:1, the proposed mapping achieves an optical SNR gain of more than 7 dB over conventional mapping. A good agreement between simulation and analysis results is obtained for the proposed scheme at high SNR.

关键词： amplitude shift keying iterative decoding modulation coding optical links

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Successive Interference Cancelation via Rank-Reduced Maximum Likelihood Detection

Successive Interference Cancelation via Rank-Reduced Maximum...

引用

76th IEEE Vehicular Technology Conference (VTC Fall)

作者： Kwon, Hyukjoon Lee, Jungwon Kang, Inyup Samsung US R&D Ctr Mobile Solut Lab San Diego CA 92130 USA

ISBN: (纸本)9781467318792

This paper proposes a codeword-based iterative detecting and decoding (IDD) algorithm using a rank-reduced maximum likelihood (ML) detector with pre-whitened interference over multiple-input multiple-output (MIMO) channels. This iterative algorithm operates on the principle of successive interference cancelation (SIC) where all the layers per codeword are decoded together at each iteration. The recent wireless standard requires to encode data bits per codeword, not per layer at multiple antennas. Thus, SIC algorithms based on layer-separating detectors could lose joint information between layers in a single codeword. Instead, the proposed algorithm minimizes this loss by using rank-reduced ML detectors over soft feedback. Simulations are performed on a space-time bit-interleaved coded modulation over Rayleigh fading channels, and demonstrate the proposed SIC algorithm is superior to comparable iterative and non-iterative IDD algorithms.

关键词： maximum likelihood detection codeword Interference cancellation wireless standard Iterative algorithms Raleigh fading channels Type 1 Diabetes Mellitus detector modulation coding

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Delay Calibration System For A Two Way Satellite Time & Frequency Transfer Station

Delay Calibration System For A Two Way Satellite Time & Freq...

引用

26th European-Frequency-and-Time-Forum (EFTF) Meeting

作者： Mubarak, Faisal Dierikx, Erik VSL NL-2600 AR Delft Netherlands

ISBN: (纸本)9781467319232

A completely automated system has been designed to calibrate path delays in a two way satellite time and frequency transfer (TWSTFT) ground station. The heart of this delay calibration system is a dual bidirectional up/down converter that converts the modulated pseudo random noise (PRN) code from 70 MHz to Ku-band (10 GHz to 14 GHz) frequencies and vice versa. Besides the usual transmit (Tx) and receive (Rx) paths in the TWSTFT system, the dual bi-directional up/down converter offers two additional independent transmit and receive paths. These additional paths allow performing different independent loop delay measurements within the station from which the individual path delays can be calculated.

关键词： artificial satellites calibration delays frequency measurement microwave measurement microwave receivers modulation coding pseudonoise codes random codes random noise satellite ground stations time measurement

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A DC-Free Multi-Mode Run-Length Limited coding Scheme

A DC-Free Multi-Mode Run-Length Limited Coding Scheme

引用

IEEE Information Theory Workshop (ITW)

作者： Heymann, C. H. Ferreira, H. C. Weber, J. H. Univ Johannesburg Dept E&E Eng Sci Johannesburg South Africa Delft Univ Technol Delft Netherlands

An RDS-minimizing, multi-mode modulation coding scheme, using maximum run-length violating markers and based on the Knuth balancing approach, is applied to run-length limited sequences. Simulations are used to measure... 详细信息

ISBN: (纸本)9781467302234;9781467302241

关键词： labeling scheme run-length limited simulating Spectra modulation coding

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