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检索条件"主题词=Modulation coding"

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On Low-Density MIMO Codes

On Low-Density MIMO Codes

引用

IEEE International Conference on Communications (ICC)

作者： F. Kienle Microelectronic Systems Design Research Group University of Kaiserslautern Kaiserslautern Germany

Multiple antenna systems are promising approaches to increase the data rate of wireless communication systems. There, modulated symbols are multiplexed on multiple transmission antennas. Typically an outer error correcting code is used additionally to ensure a desired quality of service for a given data rate. An appropriate communications performance can be achieved by iterative decoding, where probabilistic information are exchanged between outer decoder and the MIMO demodulator. However, in this case the MIMO demodulator has to calculate probabilistic soft-output values for each bit which can be very complex. In this paper we present a new class of linear block codes named low-density MIMO codes which reduces the complexity of the MIMO soft-demodulator and the outer channel decoder inherently by code design without decreasing the data rate of the overall system. These LDMC codes can have a better communications performance then state of the art solutions with a order of magnitude smaller decoding complexity.

关键词： MIMO Demodulation Iterative decoding Parity check codes Transmitting antennas Receiving antennas Sparse matrices Quality of service Block codes modulation coding

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A pragmatic labeling design of MIMO BICM-ID systems based on EXIT chart

A pragmatic labeling design of MIMO BICM-ID systems based on...

引用

IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)

作者： Tsang-Wei Yu Chung-Hsuan Wang Wern-Ho Sheen Department of Communication Engineering National Chiao Tung University Hsinchu Taiwan Department of Information and Communication Engineering Chao Yang University of Technology Taichung Taiwan

We propose a pragmatic labeling design based on the extrinsic information transfer (EXIT) chart for bit-interleaved coded modulation with iterative decoding on multiple-input-multiple-output channels. In our design, the EXIT chart is used to determine a candidate set of labelings which have representative demapper transfer curves. Then, a procedure to generate these labelings is provided based on the genetic algorithm. Given fixed channel code and signal-to-noise ratio (SNR), we can search within this candidate set for a most-suitable labeling to minimize the bit-error-rate (BER) with low complexity. Simulation results show that the labeling chosen from the candidate set exhibits a controllable BER performance gap compared to the optimal labeling found through exhaustive search. Besides, even though the channel code or the SNR is changed, the same candidate set can still be directly adopted to reduce the time on re-searching a new labeling.

关键词： Labeling MIMO Bit error rate Iterative decoding Design engineering Interleaved codes modulation coding Genetic algorithms Signal to noise ratio Optimal control

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A WiMAX Physical Layer Use for Emergency Audio Communications

A WiMAX Physical Layer Use for Emergency Audio Communication...

引用

IEEE International Conference on Wireless and Mobile Computing, Networking And Communications (WiMob)

作者： Nicolas Fourty Thierry Val Anne Wei LATTIS-EA4155 Université de Toulouse France

Placed in the context of emergency communication situations, where all network infrastructures are totally down, the audio communication is required in the first hours. This paper presents a new WiMAX PHY layer model used to determine thresholds for modulation profile switching in order to enhance the communication robustness or throughput. The model used in this paper is our implemented WiMAX model using Adaptive modulation and coding (AMC) schemes. Two channel models and two WiMAX modulation profiles are studied using two different audio samples. The simulation results obtained and confirmed by listening experiments, have demonstrated that the audio quality is improved in terms of perceived noise. Thus, the new criterion using WiMAX radio is well suited for emergency communications.

关键词： WiMAX Physical layer Mobile communication Mathematical model modulation coding Quality of service Emergency services Certification Broadcasting Mobile computing

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Performance analysis of multitone direct-sequence spread spectrum in the presence of carrier frequency offset

Performance analysis of multitone direct-sequence spread spe...

引用

International Conference on Communications and Networking in China (CHINACOM)

作者： Hongxiang Li David W. Matolak Department of Electrical & Computer Engineering North Dakota State University Fargo ND USA School of Electrical Engineering & Computer Science Ohio University Athens OH USA

It is well known that accurate synchronization is more critical in multicarrier systems than in single carrier systems. Here we provide new analytical and computer simulation results for performance of MT-DS-SS signaling in the presence of imperfect carrier synchronization, modeled as frequency offset with Gaussian statistics. We investigate performance as a function of frequency offset standard deviation, the number of subcarriers and per-subcarrier processing gain. Random spreading codes are used, and we assume coherent BPSK modulation. Comparisons between simulations and analysis show excellent agreement, and also show the expected increased sensitivity of MT-DS-SS to frequency offset, compared with single-carrier DS-SS.

关键词： Performance analysis Spread spectrum communication Frequency synchronization Signal analysis Computer simulation Statistical analysis Performance gain Binary phase shift keying modulation coding Analytical models

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Modified Log-MAP Algorithm for Simplified Decoding of Turbo and Turbo TCM Codes

Modified Log-MAP Algorithm for Simplified Decoding of Turbo ...

引用

IEEE Conference on Vehicular Technology (VTC)

作者： Stylianos Papaharalabos Michal Sybis Piotr Tyczka P. Takis Mathiopoulos Institute of Space Applications and Remote Sensing (ISARS) National Observatory of Athens Penteli Greece Wireless Communications Poznan University of Technology Poznan Poland

A novel method for approximating the optimal max* operator in Log-MAP decoding of turbo and turbo trellis-coded modulation (TTCM) codes is presented. The max* operation is performed on n>2 rather than on only two inputs, as it is in the conventional approach. The approximation uses a very simple max operation and a look-up table (LUT) with only eight stored values. Complexity comparison reveals a significant reduction in the number of operations required per decoding step for the presented approximation, as compared with the conventional Log-MAP decoding. Performance evaluation results are presented for both turbo and TTCM codes, showing the near-optimal performance of the novel approach.

关键词： Turbo codes Iterative decoding modulation coding Table lookup Wireless communication Bit error rate Degradation Concatenated codes Convolutional codes Remote sensing

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Scheduling strategies for non-binary LDPC codes

Scheduling strategies for non-binary LDPC codes

引用

IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)

作者： Sanae El Hassani Marie-Hélène Hamon Pierre Pénard Orange Labs Cesson-Sévigné Cedex France

Non-binary LDPC codes are promising error correcting codes for short and moderate block lengths. These codes demonstrate interesting performances in high order fields, though are more complex to decode. As for binary LDPC codes, decoding scheduling can be optimized to improve performance. In this paper, a simulation-based approach is used for different scheduling policies in the non-binary case in order to point out possible performance gains for these codes. An optimization of decoding scheduling is also proposed and exhibits about 20% complexity reduction in error-floor region, thus promising interesting gains if combined with advanced dynamic scheduling strategies.

关键词： Parity check codes Decoding modulation coding Performance gain Dynamic scheduling Galois fields Power generation Error correction codes Belief propagation Binary phase shift keying

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A Novel Carrier Frequency Offset Tracking Scheme in MQAM-OFDM Systems

A Novel Carrier Frequency Offset Tracking Scheme in MQAM-OFD...

引用

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

作者： Lijun Ge Yingxin Zhao Yu'ang Jin Wenqi Li Hong Wu Department of Communication Engineering College of Information Technical Science Nankai University Tianjin China

A novel carrier frequency offset tracking scheme for multilevel quadrature amplitude modulation-orthogonal frequency division multiplexing (MQAM-OFDM) systems is proposed using a designed conjugate code composed of MQAM mapping values and their complex conjugates which can also reduce peak-to-average power ratio (PAPR). The peak power is reduced by phase cancellation in the conjugate pairs avoiding accumulation of too much same phase subcarriers. A likelihood function is deduced from the conjugate code to estimate the phase offset caused by carrier frequency offset (CFO). A novel multicarrier phase locked loop (MPLL) is described tracking the frequency offset in time and frequency domain. The algorithm performance was investigated in a designed system showing that the proposed scheme can reduce the PAPR of the system effectively and track the frequency offset in high precision.

关键词： Peak to average power ratio Frequency estimation Amplitude modulation Frequency modulation modulation coding Quadrature amplitude modulation Frequency division multiplexing Phase estimation Phase locked loops Tracking loops

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A Characterisation of HSDPA Capacity Using EXIT Chart Techniques

A Characterisation of HSDPA Capacity Using EXIT Chart Techni...

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International Conference on Next Generation Mobile Applications, Services and Technologies (NGMAST)

作者： Abiodun O. Sholiyi Biljana Badic Rob M. Joyce Tim O'Farrell School of Engineering Swansea University Swansea UK School of Electronic & Electrical Engineering University of Leeds Leeds UK

High-Speed Downlink Packet Access (HSDPA) is currently in use as 3.5G operating at various transmission rates with a peak rate of 14.4MMBit/s. Turbo code with higher order modulation is used in channel coding and modulation. In this paper the extrinsic information transfer chart (EXIT chart) analysis has been applied as a tool to evaluate the performance of High Speed Downlink Packet Access (HSDPA) with turbo encoding. It has been shown that the UMTS turbo code is not fully utilizing the capacity of the channel as the throughput is less than the attainable capacity of the channel. The performance evaluation is based on analysis for QPSK modulation and code rate 1/2 and 1/3 respectively.

关键词： Multiaccess communication modulation coding Downlink Turbo codes Performance analysis Channel capacity Channel coding Information analysis 3G mobile communication Throughput

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Emulation of MBOC in GALILEO with SIMULINK

Emulation of MBOC in GALILEO with SIMULINK

引用

Congress on Image and Signal Processing, CISP

作者： Li-chun Hao Qi Zhao School of Electronics and Information Engineering Beijing Aeronautics and Astronautics University Beijing China

A new form of signals will be adopted by GALILEO in its signals of E1 *** is the important technology to produce the new signals. Firstly the definition of MBOC and the performance of its spectrum is introduced in this paper , then on the basis of exposition of the fundamental principle to the technology of MBOC, basing on the technology of Matlab/Simulink , a way to set up simulation model of MBOC in the environment of Matlab is presented, the feasibility is inspected and verified in terms of theory, specific meaning of guidance will be given by this technology. The effectiveness of MBOC has been shown in the results of actual running.

关键词： Emulation Global Positioning System modulation coding Frequency Time domain analysis Density functional theory Space technology Mathematical model Hafnium Interference

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Insertion rate and optimization of redundancy of constrained systems with unconstrained positions

Insertion rate and optimization of redundancy of constrained...

引用

IEEE International Symposium on Information Theory

作者： Hiroshi Kamabe Department of Information Science Gifu University Gifu Japan

ISBN: (纸本)9781424443123

It was recently shown that the code rate of a simple coding scheme is better than a previously established maxentropic bound for the Wijngaarden-Immink reversed modulation and error control scheme(W-I coding scheme). This paper analyzes code rates of coding schemes for a given insertion rate of the W-I coding scheme using finite state transition diagrams. A new coding scheme is proposed and a new bound for the code rate of the W-I coding scheme is derived. It is proved that the new bound is better than the maxentropic bound when the insertion rate is 1/2.

关键词： Constraint optimization Error correction codes Redundancy Binary sequences Digital recording Information science modulation coding Error correction Control systems Magnetic heads

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