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检索条件"主题词=Modulation coding"

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Hybrid ARQ using modulation Switching

Hybrid ARQ using Modulation Switching

引用

IEEE Conference on Vehicular Technology (VTC)

作者： Bumsoo Park Byung-Jae Kwak Dong Seung Kwon Mobile Telecommunication Research Division Electronics and Telecommunications Research Institute Daejeon South Korea

Multilevel modulation schemes have variations in bit-reliabilities and each has different symbol reliabilities. Choosing the modulation scheme which has the greatest symbol reliability at target SNR on retransmissions offers more chances to get higher Hybrid ARQ performance by making the sum of total bit-reliabilities greater in the entire decoding block. This paper presents a novel Hybrid ARQ scheme which is focused on reducing the number of bits whose reliabilities are low and increasing the total sum of reliabilities of transmitted bits. Proposed Hybrid ARQ scheme achieves more performance gain when in combination with modulation level switching.

关键词： Automatic repeat request Forward error correction Decoding Quadrature amplitude modulation Performance gain Error correction Redundancy Constellation diagram Telecommunication switching modulation coding

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Error probability of BICM in fading channels: Uniform interleaving analysis

Error probability of BICM in fading channels: Uniform interl...

引用

IEEE International Symposium on Information Theory

作者： Alfonso Martinez Albert Guillen i Fabregas Centrum voor Wiskunde en Informatica Amsterdam Netherlands Engineering Department University of Cambridge Cambridge UK

ISBN: (纸本)9781424443123

This paper studies the average error probability of bit-interleaved coded modulation with uniform interleaving in fully-interleaved fading channels. At large signal-to-noise ratio, the dominant pairwise error events are mapped into symbols with Hamming weight larger than one, causing a flattening of the error probability. Closed-form expressions for the error probability with general modulations are provided. For interleavers of practical length, the flattening is noticeable only at very low values of the error probability.

关键词： Error probability Fading Interleaved codes Signal to noise ratio modulation coding Hamming weight Closed-form solution Quadrature phase shift keying Labeling Gaussian noise

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Polarization-multiplexed multilevel LDPC-Coded modulation for optical communication systems

Polarization-multiplexed multilevel LDPC-Coded modulation fo...

引用

European Conference on Optical Communication (ECOC)

作者： Lyubomir L. Minkov Ivan B. Djordjevic Lei Xu Ting Wang Department of Electrical and Computer Engineering University of Arizona Tucson Tucson AZ USA NEC Laboratories of America Inc. Princeton NJ USA

Polarization-multiplexed coded-modulation, with joint coherent MAP detection and soft-iterative decoding, which considers independent symbols transmitted over both polarizations as a super-symbol is proposed. Penalty ... 详细信息

关键词： Optical polarization Optical modulation Optical fiber communication Equalizers Optical receivers Optical transmitters Optical distortion Optical filters Optical noise modulation coding

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Information representation and coding for flash memories

Information representation and coding for flash memories

引用

IEEE Pacific Rim Conference on Communications, Computers and Signal Processing

作者： Anxiao Jiang Jehoshua Bruck Computer Science and Engineering Department Texas A and M University College Station TX USA Electrical Engineering Department California Institute of Technology Pasadena CA USA

ISBN: (纸本)9781424445608

Flash memories are a very widely used type of non-volatile memory. Like magnetic recording and optical recording, flash memories have their own distinct properties. These distinct properties introduce very interesting information-representation and coding problems, which address many aspects of a successful storage system. In this paper, we survey recent results in this area. A focus is placed on rewriting codes and rank modulation.

关键词： Information representation Flash memory Nonvolatile memory Magnetic recording Optical recording Magnetic properties Current measurement Charge measurement modulation coding Tunneling

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The Aladdin-Pythagoras space-time code

The Aladdin-Pythagoras space-time code

引用

IEEE International Symposium on Information Theory

作者： Joseph J. Boutros Hugues Randriambololona Department of Electrical Engineering Texas A and M University Qatar Doha Qatar Computer Science and Networks Department Telecom ParisTech-CNRS LTCI UMR 5141 Paris France

ISBN: (纸本)9781424443123

Our motivation is the design of space-time coding which is optimal under both maximum likelihood and iterative decoding. We describe the construction of new full-rate space-time codes with non-vanishing determinant that satisfy the genie conditions for iterative probabilistic decoding. The problem combining the genie conditions and the rank criterion is rewritten in terms of a quadratic form. The construction over ¿[i] (the cubic lattice) yields a family of codes defined by Pythagorean triples. The space-time code built over ¿[i] and involving the quaternion algebra (i,5/¿(i)) is referred to as the Aladdin-Pythagoras code. The construction over ¿[j] (the hexagonal lattice) also yields a full-rate non-vanishing determinant code that is suitable for iterative decoding on multiple antenna channels.

关键词： Space time codes Iterative decoding Maximum likelihood decoding MIMO Lattices Pairwise error probability Error correction codes modulation coding Computer science education Cities and towns

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Multi-dimensional signal mapping for MIMO-BICM-ID over block fading channels

Multi-dimensional signal mapping for MIMO-BICM-ID over block...

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

作者： Muammar A. Alfasi Yousef R. Shayan Department of Electrical and Computer Engineering Concordia University Montreal Canada

The mapping of coded bits to constellation symbols plays an important role in determining the bit error rate performance of bit interleaved coded modulation systems. In this paper, we investigate the optimization of multi-dimensional mapping for bit interleaved coded modulation with iterative decoding over block fading MIMO channels. To introduce the optimized mappings, cost function is derived based on upper bound on the pairwise error probability. The optimized mappings perform better than the conventional mapping, and other proposed mappings.

关键词： Signal mapping Fading Interleaved codes modulation coding Bit error rate Iterative decoding MIMO Cost function Upper bound Pairwise error probability

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Hybrid Continuous-Time/Discrete-Time Cascade ΣΔ Modulators with Programmable Resonation

Hybrid Continuous-Time/Discrete-Time Cascade ΣΔ Modulators...

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IEEE International Symposium on Circuits and Systems (ISCAS)

作者： Jose M. de la Rosa Alonso Morgado Rocio del Rio Instituto de Microelectrónica de Sevilla IMSE-CNM Parque Tecnológico de la Cartuja CSIC-Universidad de Sevilla Seville Spain

This paper presents novel architectures of hybrid continuous-time/discrete-time cascade SigmaDelta modulators that combine the benefits of both circuit techniques with programmable noise transfer function resonation and unity signal transfer function in all stages. Both local and inter-stage based resonation topologies are synthesized and compared in terms of their circuit complexity, resolution-bandwidth programmability and robustness with respect to circuit implementation. As an application, a multi-standard case study is presented, targeting 5-14 bit programmable effective resolution within a tunable 100 kHz-100 MHz signal bandwidth.

关键词： modulation coding Transfer functions Signal resolution Circuit noise Circuit topology Circuit synthesis Signal synthesis Complexity theory Noise robustness Tunable circuits and devices

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Bit-Interleaved LDPC-Coded modulation with Iterative Demapping and Decoding

Bit-Interleaved LDPC-Coded Modulation with Iterative Demappi...

引用

IEEE Conference on Vehicular Technology (VTC)

作者： Qiuliang Xie Kewu Peng Jian Song Zhixing Yang Tsinghua National Laboratory of Information Science and Technology (TNList) Department of Electronic Engineering Tsinghua University Beijing China

Bit-interleaved coded modulation (BICM) is a sub- optimal scheme from the average mutual information (AMI) point of view due to independent demapping. However, this AMI loss can be neglected for signal constellations with Gray mapping at high coding rates. AMI of amplitude-phase shift keying (APSK) constrained additive white Gaussian noise (AWGN) channel is provided in this paper, which shows that the BICM scheme has considerable loss with APSK constellations since no Gray mapping exists. Bit-interleaved low-density parity-check (LDPC) coded modulation (BILCM) is an excellent scheme and has been employed in many broadcasting and communication systems, however, such scheme also suffers from the independent demapping loss. Therefore, BILCM with iterative demapping and decoding (BILCM-ID) is proposed in this paper to overcome such loss. Simulation results show that the BILCM-ID scheme outweighs BILCM scheme by about 0.5 and 0.3 dB over AWGN channel for 32-APSK constellation at coding rates 2/3 and 4/5, respectively.

关键词： Iterative decoding Ambient intelligence AWGN modulation coding Parity check codes Interleaved codes Mutual information Constellation diagram Signal mapping Additive white noise

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Tighter performance upper bounds for terminated convolutional codes in Rayleigh fading channels

Tighter performance upper bounds for terminated convolutiona...

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International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology, ECTI-CON

作者： Pushpika Wijesinghe Upul Gunawardana Ranjith Liyanapathirana School of Engineering University of Western Ontario NSW Australia

In this paper, we present tighter performance upper bounds for terminated convolutional codes over Rayleigh fading channels with BPSK and QPSK modulation. The performance upper bounds for convolutional codes are generally obtained from the union bound derived from the transfer function. This bound is quite loose for a terminated trellis. In the literature, performance bounds for terminated convolutional codes with BPSK in AWGN environment have been derived using a new weight enumerator obtained from a modified trellis diagram. In this work, we use the modified trellis approach to derive the weight enumerators for rate 1/2 terminated convolutional codes with QPSK modulation and derive tighter upper bounds using that.

关键词： Upper bound Convolutional codes Fading Binary phase shift keying modulation coding Quadrature phase shift keying Transfer functions Bit error rate Hamming distance Error analysis

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A 1.55 GHz to 2.45 GHz center frequency continuous-time bandpass delta-sigma modulator for frequency agile transmitters

A 1.55 GHz to 2.45 GHz center frequency continuous-time band...

引用

IEEE Symposium on Radio Frequency Integrated Circuits (RFIC)

作者： Martin Schmidt Markus Grozing Stefan Heck Ingo Dettmann Manfred Berroth Dirk Wiegner Wolfgang Templ Andreas Pascht Institute of Electrical and Optical Communications Engineering University of Stuttgart Stuttgart Germany Bell Laboratories Alcatel-Lucent Stuttgart Germany

ISBN: (纸本)9781424433773

This paper presents a 4 th order continuous-time bandpass delta-sigma modulator (CT-BPDSM) with a programmable center frequency ranging from 1.55 GHz to 2.45 GHz. The modulator is suited to be applied in multistandard class-S power amplifiers. The circuit features a multifeedback architecture with return-to-zero (RZ) and half-return-to-zero (HRZ) pulses. The loop filters consist of LC-resonators with emitter degenerated input transconductors and Q-enhancement circuits. A configuration register allows to program the resonator input transconductors, the Q-enhancement circuits and the resonator capacitances with 5 bit resolution. Fine tuning of the resonator center frequency is achieved with varactors. The circuit is implemented in a 200 GHz-f T SiGe-bipolar technology. The measured SNR at 2.2 GHz center frequency is 45.5 dB in a bandwidth of 20 MHz. At 1.55 GHz the SNR decreases to 40.7 dB. The measured uplink UMTS-FDD ACLR (adjacent channel leakage power ratio) of the modulator output is 48.4 dB in the first adjacent channel.

关键词： Delta modulation Frequency modulation Transmitters Pulse amplifiers Transconductors modulation coding Power amplifiers Pulse circuits Band pass filters Resonator filters

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