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检索条件"主题词=Modulation coding"

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A Novel Link Performance Prediction Method for Coded MIMO-OFDM Systems

A Novel Link Performance Prediction Method for Coded MIMO-OF...

引用

IEEE Conference on Wireless Communications and Networking

作者： I. Stupia F. Giannetti V. Lottici L. Vandendorpe University of Pisa Pisa Italy Université Catholique de Louvain Louvain-la-Neuve Belgium

Coded multi-antenna and multi-carrier techniques combined together with link resources adaptation algorithms are the key technologies toward efficient high-data-rate communications over wireless fading channels. The practicability of this concept, however, requires that the transmitter can perform accurate and simple evaluation of the actual link performance. This paper contributes with a novel method specifically developed to predict the link performance of bit-interleaved coded MIMO- OFDM links, which offers improved accuracy at the price of lower complexity when compared with conventional techniques. Its effectiveness is confirmed through extensive simulation results obtained over typical wireless channel environments.

关键词： Prediction methods modulation coding Fading Transmitters MIMO AWGN Signal to noise ratio OFDM Predictive models Interleaved codes

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A new multicode interference cancellation method for HSDPA system

A new multicode interference cancellation method for HSDPA s...

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IEEE Pacific Rim Conference on Communications, Computers and Signal Processing

作者： Sungbong Kim Seunghwan Kim Changtaek Shin Jinyong Lee Younglok Kim Department of Electronic Engineering Sogang University Seoul South Korea

ISBN: (纸本)9781424445608

This paper proposes a new multicode interference cancellation algorithm which uses frequency responses of the channelization codes used in HSDPA system. The proposed algorithm estimates the multicode interference components at the chip rate, and then it improves the detection performance e by removing the estimated interferences from received signal. The computer simulation shows that the receiver adapting the proposed algorithm decreases the receiving power by 6.0 dB to achieve 10 -2 uncoded BER compared with conventional LMMSE algorithm.

关键词： Interference cancellation Multiaccess communication AWGN Downlink Power system modeling modulation coding Fading RAKE receivers Equations Biotechnology

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Probabilistic Data Detection for Probe-Based Storage Channels in the Presence of Jitter

Probabilistic Data Detection for Probe-Based Storage Channel...

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IEEE International Conference on Communications (ICC)

作者： H. Pozidis G. Cherubini IBM Research Zurich Research Laboratory Ruschlikon Switzerland

Probe-storage devices employ large arrays of probes to write/read data in parallel in some storage medium. Because of their inherent parallelism and the independence of data retrieved from different probes, these devices lend themselves naturally to low-density parity-check (LDPC) codes and associated soft/iterative decoding techniques. In this paper, a concatenated coding scheme for a particular probe-storage channel is presented that comprises an inner (d, k)-constrained code and an outer LDPC code, and the problem of probabilistic data retrieval for this channel is addressed. In particular, soft information is generated by explicitly accounting for the channel output statistics in the presence of jitter and additive noise, based on derived analytical expressions.

关键词： Jitter Parity check codes Iterative decoding modulation coding Probes Concatenated codes Error correction codes Information retrieval System performance Probability

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Iterative Partial PIC for Convolutionally Coded Multi-Carrier DS-CDMA

Iterative Partial PIC for Convolutionally Coded Multi-Carrie...

引用

International Conference on Computational Intelligence and Software Engineering (CiSE)

作者： Guoxiong Xu Quanhang Liu Sch. of Electron. Inf. Zhongyuan Univ. of Technol. Zhengzhou China

In this paper, we consider convolutionally coded multi-carrier DS-CDMA and propose turbo partial parallel interference cancellation (PPIC) and decoding, which is termed turbo PPIC/decoding. We make analysis and simulations for turbo PPIC/decoding by the computer. The simulation results shows that turbo PPIC/decoding, whether with a priori LLR feedback or with a posteriori LLR feedback, obtains the most dominant performance improvement for the first three iterations, but up to the fourth iteration, the performance improves little, and for the same number of iterations, turbo PPIC/decoding with a posteriori LLR feedback outperforms that with a priori LLR feedback in performance. We also compare turbo PPIC /decoding with turbo PIC/decoding which was previously discussed, which shows that Turbo PPIC /decoding is dominantly superior to Turbo PIC /decoding in performance.

关键词： Convolutional codes Multiaccess communication Iterative decoding Multiuser detection Interference cancellation Multiple access interference Feedback Convolution Computational modeling modulation coding

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Coded M-PSK modulation using Convolutional Self-Doubly Orthogonal Codes

Coded M-PSK Modulation using Convolutional Self-Doubly Ortho...

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IEEE Conference on Vehicular Technology (VTC)

作者： Christian Cardinal Bakitanga-Florian Mvutu Department of Electrical Engineering École Polytechnique de Montréal Montreal QUE Canada

In this paper, coded modulation technique based on the use of convolutional self-doubly orthogonal codes (CSO 2 C) and threshold iterative decoding is presented. Two different methods of coded modulation are considered. The first approach is based on a conventional pragmatic scheme. In the second approach, all information bits are coded and a simpler Gray coding is used for the bit-to-symbol mapping. Simulation results indicate that for a bit error rate of 10 -5 , the pragmatic 8-PSK coded modulation scheme with R = 2/3 coding rate provides a coding gain of 3 dB as compared with the error performances of the uncoded QPSK system. The simulation results also demonstrate that by using the second approach, a larger coding gain of 4.5 dB is obtained when compared with uncoded QPSK modulation.

关键词： modulation coding Convolutional codes Iterative decoding Quadrature phase shift keying Delay Bit error rate Performance gain Bandwidth

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Queuing Analysis on Adaptive Transmission in MIMO Systems with Imperfect CSI

Queuing Analysis on Adaptive Transmission in MIMO Systems wi...

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IEEE Conference on Vehicular Technology (VTC)

作者： Xin Liao Luting Kong Jun Jiang Ping Zhang Key Laboratory of Universal Wireless Communications Ministry of Education Beijing University of Posts and Telecommunications Beijing China

The adaptive transmission jointly considering adaptive modulation and coding (AMC) and automatic repeat request (ARQ) has been applied to MIMO systems to provide high spectral efficiency and link robustness. However, the adaptive transmission requires knowledge of the channel state information (CSI) and in practice perfect CSI is rarely available. In this paper, under the condition of finite-length buffer, the queuing characteristics of the Zero-Forcing (ZF) detection MIMO systems combining with adaptive transmission in the presence of imperfect CSI are analyzed. We use Markov-chain-based analytical framework to investigate the performance of the systems and derive the close form expressions for the throughput, packet loss rate and average delay, from which we can maximize the overall system throughput under the specified QoS constraints through numerical search. The simulation results demonstrate the verification of the performance analysis.

关键词： Queueing analysis MIMO Automatic repeat request Performance analysis Throughput modulation coding Robustness Channel state information Adaptive systems Performance loss

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Adaptively switching between CSMA and SD-CSMA in multi-antenna based Ad Hoc Networks

Adaptively switching between CSMA and SD-CSMA in multi-anten...

引用

MILCOM, Military Communications Conference

作者： Pengkai Zhao Ajit Warrier Oscar Takeshita Weijun Zhu Babak Daneshrad Electrical Engineering Department UCLA-CA Los Angeles CA USA Silvus Technologies Inc. Los Angeles CA USA

ISBN: (纸本)9781424452385

Carrier sense multiple access (CSMA) is the conventional medium access method used in wireless ad hoc networks. it can be enhanced as a space-division based CSMA (namely, SD-CSMA) by using multi-antenna techniques, which allows concurrent link communications in the network. In this paper, we present a MAC design that can adaptively switch between CSMA and SD-CSMA in multi-antenna based ad hoc networks. We first investigate the CSMA mode and the SD-CSMA mode by considering several practical constraints from MIMO physical layer, which include imperfect channel estimation, modulation and coding scheme, MMSE detection, power constraint and packet length. We then propose a selection criterion that adaptively switches between CSMA and SD-CSMA based on current wireless channels among nodes. Simulation results verify that the proposed design can outperform both the CSMA mode and the SD-CSMA mode in terms of aggregate throughput.

关键词： Multiaccess communication Ad hoc networks Switches Communication switching Mobile ad hoc networks MIMO Physical layer Channel estimation modulation coding Aggregates

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Performance Analysis of a Semi-fixed Mapping Scheme for VoIP Services in Wireless OFDMA Systems

Performance Analysis of a Semi-fixed Mapping Scheme for VoIP...

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International Conference on Wireless and Mobile Communications (ICWMC)

作者： Jaewoo So Department of Electronic Engineering Sogang University Seoul South Korea

Informing users about new resource assignments has to be broadcast, thus generating a substantial amount of the mapping overhead that influences the system throughput. In particular, the performance of voice-over-Internet protocol (VoIP) services is seriously affected by the mapping overhead because the VoIP packet size is small. In order to reduce the mapping overhead, a semi-fixed mapping scheme based on the periodicity of VoIP traffic was introduced. However, up to now, the detailed operation and the analysis of the semi-fixed mapping scheme have not been studied. This paper develops analytical and simulation models and evaluates the performance of a semi-fixed mapping scheme for VoIP services in wireless orthogonal frequency division multiple access systems.

关键词： Performance analysis Traffic control Analytical models Resource management Media Access Protocol Broadcasting Frequency conversion modulation coding Downlink Wireless communication

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Lattices are everywhere

Lattices are everywhere

引用

Information Theory and Applications Workshop, ITA

作者： Ram Zamir EE-Systems Tel-Aviv University Israel

ISBN: (纸本)9781424439904

As bees and crystals (and people selling oranges in the market) know it for many years, lattices provide efficient structures for packing, covering, quantization and channel coding. In the recent years, interesting links were found between lattices and coding schemes for multi-terminal networks. This tutorial paper covers close to 20 years of my research in the area; of enjoying the beauty of lattice codes, and discovering their power in dithered quantization, dirty paper coding, Wyner-Ziv DPCM, modulo-lattice modulation, distributed interference cancelation, and more.

关键词： Lattices Quantization AWGN Crystals Channel coding modulation coding Interference cancellation Additive white noise H infinity control Information theory

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SCM-Based Retransmission Scheme in Multi-Hop Relay Networks

SCM-Based Retransmission Scheme in Multi-Hop Relay Networks

引用

IEEE Conference on Vehicular Technology (VTC)

作者： Jiming Chen Shan Jin Research & Innovation Center Alcatel Shanghai Bell Corporation Limited Shanghai China

Recently, there has been an upsurge of interest in multi-hop relay in both academia and industry. By breaking a long-distance low-quality link into two or more high-quality segments, multi-hop relay is introduced to enable traffic/signaling forwarding between base station and mobile user with the benefits of throughput enhancement and coverage extension. In this paper, we propose a novel retransmission method, named SCM-based retransmission scheme, which is designed to take advantage of the multi-hop nature of the cellular network. Practically, we show that the proposed scheme improves performance with respect to its current solutions in terms of throughput, and cell latency.

关键词： Spread spectrum communication Relays Throughput Delay modulation coding Technological innovation Telecommunication traffic Decoding Downlink Base stations

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