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Impact of 4G wireless link configurations on VoIP network performance

Impact of 4G wireless link configurations on VoIP network pe...

引用

International Symposium on Wireless Communication Systems (ISWCS)

作者： Stefan Alfredsson Anna Brunstrom Mikael Sternad Computer Science Karlstad University Karlstad Sweden Signals and Systems University of Uppsala Uppsala Sweden

The performance of applications in wireless networks is partly dependent upon the link configuration. Link characteristics varies with frame retransmission persistency, link frame retransmission delay, adaptive modulation strategies, coding, and more. The link configuration and channel conditions can lead to packet loss, delay and delay variations, which impact different applications in different ways. A bulk transfer application may tolerate delays to a large extent, while packet loss is undesirable. On the other hand, real-time interactive applications are sensitive to delay and delay variations, but may tolerate packet loss to a certain extent. This paper contributes a study of the effect of link frame retransmission persistency and delay on packet loss and latency for real-time interactive applications. The results indicate that a reliable retransmission mechanism with fast link retransmissions in the range of 2-8 ms is sufficient to provide an upper delay bound of 50 ms over the wireless link, which is well within the delay budget of voice over IP applications.

关键词： Delay OFDM Telecommunication traffic Throughput Wireless networks Internet telephony Proposals Computer science Application software modulation coding

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Channel aware scheduling in MIMO based WLANs in the presence of channel uncertainty

Channel aware scheduling in MIMO based WLANs in the presence...

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International Symposium on Wireless Communication Systems (ISWCS)

作者： Jelena Mirkovic Bernhard Walke Jordi Gomez Garcia ComNets Faculty 6 RWTH Aachen University Aachen Germany

In this paper system level performance evaluation of channel aware schedulers that apply previously presented multiple input-multiple output (MIMO) link adaptation algorithms is given. The analyzed schedulers operate in single-user (SU) and in multi-user (MU) mode, and adapt either only modulation and coding scheme, or MIMO scheme in addition. The performance evaluation is done by comparative analysis of saturation throughput achievable by different schedulers, investigating the impact of MU diversity and channel uncertainty.

关键词： MIMO Uncertainty modulation coding Physical layer Signal processing algorithms Receiving antennas Scheduling algorithm Throughput Quality of service Space technology

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Golden space-time block coded modulation

Golden space-time block coded modulation

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IEEE (first ITW conference of the year) Information Theory Workshop (ITW)

作者： Laura Luzzi Ghaya Rekaya-Ben Othman Jean-Claude Belfiore Emanuele Viterbo Télécom ParisTech-École Nationale Supérieure des Télécommunications Paris France DEIS-Università della Calabria Rende Cosenza Italy

We consider a block coded modulation scheme for a 2 times 2 MIMO system over slow fading channels, where the inner code is the Golden Code. The scheme is based on a set partitioning of the Golden Code using two-sided ideals. A lower bound for the minimum determinant is given by the minimum Hamming distance. Performance simulations show that our GCRS schemes achieve a significant gain over the uncoded Golden Code.

关键词： modulation coding Block codes Fading Algebra Hamming distance MIMO Hamming weight Error correction codes Reed-Solomon codes Helium

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Rate adaptive modulation with MIMO mode switching between spatial multiplexing and diversity

Rate adaptive modulation with MIMO mode switching between sp...

引用

International Symposium on Information Theory and Its Applications, ISITA

作者： Chanhong Kim Jungwoo Lee Graduate School of Electrical Engineering Seoul National University Seoul South Korea Faculty of Electrical Engineering Seoul National University Seoul South Korea

ISBN: (纸本)9781424420681

Multiple-input multiple-output (MIMO) systems give high data rates through spatial multiplexing or diversity using space-time codes. We propose a rate-adaptive modulation scheme combined with mode switching between spatial multiplexing and orthogonal space-time block coding. We first find out which modulation level and mode maximize the spectral efficiency with a given target bit error ratio (BER). If the rates of the two MIMO modes are the same, we select one mode which gives lower BER than the other. We also propose a simple mode switching algorithm using effective SNR and constellation specific constant. Numerical results demonstrate improvement over each fixed mode with adaptive modulation in terms of average spectral efficiency.

关键词： MIMO Diversity reception modulation coding Block codes Bit error rate Transmitters Feedback Communication switching Switches Fading

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Designing a unified speech/audio codec by adopting a single channel harmonic source separation module

Designing a unified speech/audio codec by adopting a single ...

引用

International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： Sang-Wook Shin Chang-Heon Lee Hyen-O Oh Hong-Goo Kang School of Electrical and Electronic Engineering Yonsei University South Korea Digital TV Laboratory LG Electronics Inc. South Korea

This paper proposes a unified speech/audio codec by adopting a single channel harmonic separation module as a pre-processor. A modulation frequency analysis method is used for harmonic separation, and the separated components are first encoded by an appropriate codec, e.g. speech codec. The error between input and the encoded signal is re- encoded by another codec. Though any type of codec can be used for the purpose, we adopt two state-of-the-art international standards (AMR-WB and HE-AAC) to provide an interoperability option. The amount of allocated bits to each stage is controlled by a power ratio of separated harmonic components to input signal. Subjective listening tests verify the consistency of the proposed method in speech, music and mixed signal inputs.

关键词： Speech codecs Source separation Frequency modulation modulation coding Harmonic analysis Speech analysis Code standards Power system harmonics Testing Multiple signal classification

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Orthogonal Frequency Division Multiplexing (OFDM)

Orthogonal Frequency Division Multiplexing (OFDM)

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China-Japan Joint Microwave Conference

作者： Waziha Kabir Electrical Electronics & Communication Engineering Engineering MIST Rupayan Palace Dhaka Bangladesh

ISBN: (纸本)9781605608037

In broadband wireless system, the signal energy is scattered and reflected from objects in the environment, components of the signal arriving at the receiver are spread out over a longer period of time than is desirable. The challenge is then to provide a high-performance reliable data link that can operate with the restricted receiver power levels, severe channel fading due to multipath reflections and interfering energy from other devices nearby. With OFDM, it is possible to use a differential coding/differential detection either in the time or frequency domain depending on the condition of transmission channels with the adoption of DQPSK as a method of subcarrier modulation. This paper proposes an approximate derivation method of the bit error rate (BER) in DQPSK/OFDM system over frequency non-selective Nakagmai-Rice and Rayleigh fading channels. The validity of this equation is confirmed from the fact that the BER derived from this approximate equation coincides with that from the computer simulation, even when the system parameters, for example Doppler frequency, Rician parameter and so on, are varied. This paper will also review where OFDM is applicable and future applications.

关键词： Bit error rate Fading Equations Rayleigh scattering Power system reliability Reflection Frequency domain analysis modulation coding OFDM modulation Computer simulation

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Impacts of CFO, IQ Imbalance and Phase Noise on the system performance in OFDM systems

Impacts of CFO, IQ Imbalance and Phase Noise on the system p...

引用

The 11th IEEE International Conference on Communications Systems(第11届电子和电气工程师协会国际通信系统会议)(IEEE ICCS 2008)

作者： Rong Zhang Edward K.S.Au Roger S.Cheng Wireless IC System Design Center HKUST Fok Ying Tung Graduate SchoolNanshaChina Modulation and Coding Department Institute for Infocomm ResearchA*STARSingapore Department of Electronic and Computer Engineering The Hong Kong University of Science and Technology

OFDM systems are sensitive to front-end imperfections including CFO, IQ imbalance and phase noise. In practice, these imperfections are inevitable and would lead to significant performance degradation. In this paper, a general closed-form expression on average signal-to-interference-and-noise ratio (SINR) over multipath fading channels is derived for performance evaluation. When additive white Gaussian noise channels and flat fading channels are considered, the expression reduces to an exact expression and a tight upper bound, respectively. Our results show that the average SINR is inversely proportional to these front-end non-idealities.

关键词： Phase noise System performance OFDM modulation Signal to noise ratio Fading AWGN modulation coding Degradation Closed-form solution Additive white noise

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Hardware implementation of software radios

Hardware implementation of software radios

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Proceedings of the Mosharaka International Conference on Communications, Signals and coding, MIC-CSC

作者： Mohamed Nezami Mamoun Private University for Science & Technology Syria

This presentation will deal with the concept of building software radios (SDR) for multi-standard communication terminals. First the session will cover the subsystem details of software radios. Signal transmission and reception in in both transmitters and receivers will be covered. Various aspects of digital signal processing algorithm implementations will then be covered. Topics such as modulation and demodulation, coding and decoding, linearization, synchronization will be dealt with in details. Finally a wide overview of commercially available SDR implementation platforms for research purposes will be presented.

关键词： Hardware Software radio Radio transmitters Digital signal processing Signal processing algorithms modulation coding Demodulation Decoding Biographies Strontium

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Harmonic optimization in multi-level inverters using harmony search algorithm

Harmonic optimization in multi-level inverters using harmony...

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National Proceedings Power and Energy Conference (PECon)

作者： B. Majidi H. R. Baghaee G. B. Gharehpetian J. Milimonfared M. Mirsalim Department of Engineering Saint Mary''s University San Antonio TX USA Center of Excellence in Power Engineering Amirkabir University of Technology슠 Tehran Iran

This paper presents a new method to optimize harmonic stepped waveform for multi-level inverters using harmony search algorithm. The method has the benefit of high rate of convergence and precision compared to other conventional optimization methods. The proposed technique can be applied to multi-level inverters with any number of levels. The goal of optimization is to eliminate some low order harmonics and to maintain the fundamental component at the desired value. As a case study, the method is applied and tested on a 13-level inverter. Simulation results show the effectiveness and flexibility of the proposed method.

关键词： Power harmonic filters Space vector pulse width modulation Pulse width modulation inverters Equations modulation coding Voltage Optimization methods Power system harmonics Genetic algorithms Newton method

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Adaptation Combined Spatial Multiplexing and Diversity Techniques for Adaptive MIMO-OFDM System

Adaptation Combined Spatial Multiplexing and Diversity Techn...

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

作者： Yu Zhang Naitong Zhang Information Technolog Harbin Institute of Technology School of Electronics Harbin China

An adaptive modulation and coding (AMC) and adaptive antenna grouping (AAG) architecture for multi-input multi-output orthogonal frequency-division multiplexed (MIMO- OFDM) system was proposed to effectively eliminate or resist various fading in wireless channels and to offer best tradeoff between transmission reliability and capacity. This combining scheme is not only adaptively to modulate to transmit more information over subcarriers but also adaptively to find the optimal STC/SM grouping scheme according to the estimated SNR. The simulation shows that the BER and throughput performance of the AMC and AAG MIMO-OFDM system outperform the conventional MIMO-OFDM and the AMC MIMO-OFDM system.

关键词： Adaptive systems OFDM modulation Diversity reception modulation coding Adaptive arrays Transmitting antennas Frequency division multiplexing Resists Fading Samarium

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