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Pulse Shaping in Unipolar OFDM-based Modulation Schemes

Pulse Shaping in Unipolar OFDM-based Modulation Schemes

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institute of Electrical and Electronics Engineers Globecom Workshops

作者： Dobroslav Tsonev Sinan Sinanovic Harald Haas Institute for Digital Communications Joint Research Institute for Signal and Image Processing The University of Edinburgh

ISBN: (纸本)9781467349420

This paper discusses the issue of pulse shaping in unipolar orthogonal-frequency-division-multiplexing-based modulation schemes for intensity modulation/direct detection systems. Three previously presented schemes, asymmetrically clipped optical OFDM, pulse-amplitude-modulated discrete multitone modulation, and unipolar orthogonal frequency division multiplexing, are investigated. The current work demonstrates how both unipolar and bipolar pulse shapes can be used for the generation of unipolar continuous-time signals.

关键词： OFDM Modulation Optical pulse shaping Wireless communication Shape Optical sensors

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A Non-Stationary MIMO Channel Model for High-Speed Train Communication Systems

A Non-Stationary MIMO Channel Model for High-Speed Train Com...

引用

IEEE Conference on Vehicular Technology (VTC)

作者： Ammar Ghazal Cheng-Xiang Wang Harald Haas Mark Beach Xiaofeng Lu Dongfeng Yuan Xiaohu Ge Joint Research Institute for Signal and Image Processing Heriot-Watt University Edinburgh UK Joint Research Institute for Signal and Image Processing University of Edinburgh Edinburgh UK Department of Electrical & Electronic Engineering University of Bristol Bristol UK Huawei Technologies Co. Ltd. Xi'an China School of Information Science and Engineering Shandong University Jinan China Department of Electronics and Information Engineering Huazhong University of Science and Technology Wuhan Hubei China

This paper proposes a non-stationary wideband geometry-based stochastic model (GBSM) for multiple-input multiple-output (MIMO) high-speed train (HST) channels. The proposed model has the ability to investigate the non-stationarity of HST environment caused by the high speed movement of the receiver. Based on the proposed model, the space-time-frequency (STF) correlation function (CF) and STF local scattering function (LSF) are derived for different taps. Numerical results show the non-stationarity of the proposed channel model.

关键词： Channel models Wireless communication MIMO Mathematical model Educational institutions Doppler effect Antenna measurements

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Energy-Efficient Subcarrier-and-Bit Allocation in Multi-User OFDMA Systems

Energy-Efficient Subcarrier-and-Bit Allocation in Multi-User...

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IEEE Vehicular Technology Conference

作者： Fourat Haider Cheng-Xiang Wang Harald Haas Erol Hepsaydir Xiaohu Ge Joint Research Institute for Signal and Image Processing Heriot-Watt University Edinburgh EH14 4AS UK Joint Research Institute for Signal and Image Processing University of Edinburgh Edinburgh EH9 3JL UK Hutchison 3G UK 20 Grenfell Rd. Maidenhead SL6 1EH UK Department of Electronics and Information Engineering Huazhong University of Science and Technology Wuhan 430074 Hubei China

ISBN: (纸本)9781467309899

Energy efficiency is becoming increasingly important for wireless communication systems in order to minimize carbon footprint of wireless networks and to increase the battery life of mobile terminals. The spectral-energy efficiency trade-off is of primary significance to determine how much energy per bit is required in a wireless communication system to achieve a specific spectral efficiency. In this paper, we study energyefficient resource allocation scheme for Orthogonal Frequency- Division Multiple Access (OFDMA) systems with multiple users. The trade-off between spectral and energy efficiencies is analyzed under the constraint of maintaining the fairness among users. We first formulate the energy-efficient optimization problem as an integer fractional programming. We then apply an iterative fractional method to simplify the problem to integer linear programming (ILP) problem. Simulation results demonstrate that the impact of user's quality of service (QoS) is minor on the energy efficiency when a large spectral efficiency is required.

关键词： Energy-Efficient Subcarrier-and-Bit Allocation Multi-User OFDMA Systems Energy efficiency Wireless communication systems spectral efficiency Battery Life Bit rate OFDMA Consumers Wireless networks Quality of service Resource utilization User chargeback systems UIS(Computer)

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Performance analysis of indoor OFDM optical wireless communication systems

Performance analysis of indoor OFDM optical wireless communi...

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IEEE Conference on Wireless Communications and Networking

作者： Raed Mesleh Hany Elgala Harald Haas Electrical Engineering Department and Sensor Networks and Cellular Systems (SNCS) research Center University of Tabuk Tabuk Saudi Arabia Jacobs University Bremen Bremen Germany Institute for Digital Communications Joint Research Institute for Signal and Image Processing University of Edinburgh Edinburgh UK

In this paper, the performance of indoor OFDM (orthogonal frequency division multiplexing) optical wireless (OW) communication systems in the presence of LED (light emitting diode) clipping distortions is analyzed. Two indoor OW OFDM techniques are considered. An ACO-OFDM (asymmetrically clipped optical OFDM) system produces half-wave symmetry time signal at the output of the OFDM modulator by special assignment of subcarriers. Therefore, bipolar-unipolar conversion is achieved by clipping the signal at the zero level at the expense of data rate reduction. The second technique, called DCO-OFDM (DC-biased optical OFDM), assigns data to all possible subcarriers to increase the data rate. However, half-wave symmetry signals cannot be achieved and a DC bias is needed to convert the bipolar signal to a unipolar signal before modulating the LED intensity. The performance of these systems, in terms of average electrical OFDM signal power versus bit-error-ratio (BER), DC power consumption, and transmitted optical power in the presence of additive white Gaussian noise (AWGN) channel and considering a practical LED model, are studied. Analytical results are validated through Monte Carlo simulation results and the results demonstrate close match. The results clearly highlight that LED clipping has significant impact on the performance of these systems and system design should consider optimizing the OFDM signal power, DC bias point, and LED dynamic range.

关键词： OFDM Light emitting diodes Optical distortion Optical sensors Optical modulation Noise

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A non-stationary geometry-based stochastic model for MIMO high-speed train channels

A non-stationary geometry-based stochastic model for MIMO hi...

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International Conference on ITS Telecommunications (ITST)

作者： Ammar Ghazal Cheng-Xiang Wang Harald Haas Mark Beach Raed Mesleh Dongfeng Yuan Xiaohu Ge Mohamed Khaled Chahine Joint Research Institute for Signal and Image Processing Heriot-Watt University Edinburgh UK School of Information Science and Engineering Shandong University Jinan China Joint Research Institute for Signal and Image Processing University of Edinburgh Edinburgh UK Department of Electrical & Electronic Engineering University of Bristol Bristol UK Sensor Networks and Cellular Systems (SNCS) Research Center University of Tabuk Tabuk Saudi Arabia Department of Electronics and Information Engineering Huazhong University of Science and Technology Wuhan Hubei China Faculty of Mechanical and Electrical Engineering Damascus University Syria

In this paper, a non-stationary wideband geometry-based stochastic model (GBSM) is proposed for multiple-input multiple-output (MIMO) high-speed train (HST) channels. The proposed model employs multiple confocal ellipses model, where the received signal is a superposition of the line-of-sight (LoS) and single-bounced rays. Because of the time-varying feature of angles of arrival (AoAs), angles of departure (AoDs), and LoS angle, the proposed GBSM has the ability to investigate the non-stationarity of HST environment caused by the high speed movement of the receiver. From the proposed model, the local spatial cross-correlation function (CCF) and the local temporal autocorrelation (ACF) are derived for different taps. Numerical results and analysis show that the proposed channel model is capable of characterizing the time-variant HST wireless channel.

关键词： Channel models MIMO Wireless communication Educational institutions Correlation Antennas Rail transportation

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Base station energy consumption for transmission optimised spatial modulation (TOSM) in correlated channels

Base station energy consumption for transmission optimised s...

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IEEE International Workshop on Computer-Aided Modeling, Analysis, and Design of Communication Links and Networks, CAMAD

作者： Xiping Wu Sinan Sinanović Marco Di Renzo Harald Haas Institute for Digital Communications Joint Research Institute for Signal and Image Processing School of Engineering University of Edinburgh Edinburgh UK French National Centre for Scientific Research (CNRS) Laboratory for Signals and Systems (LSS) École Supérieure d'Électricité (SUPELEC) Gif-sur-Yvette France

Radio frequency (RF) chains are responsible for a large percentage of the total BS energy consumption and each RF chain can only support one activated transmit antenna at a time. This fact greatly benefits spatial modulation (SM) since at any given time instance only one antenna in an array is active. The proposed transmission optimised spatial modulation (TOSM) is an adaptive SM scheme which trades off the spatial constellation size with the signal constellation size to minimise the average bit error probability (ABEP) for a given channel correlation. It outperforms fixed-SMscheme for different channel correlation degrees. In this paper, we construct a single RF chain BS based on TOSM which has low complexity and high energy-efficiency. Simulation results show that for a given spectral efficiency of 6 bits/s/Hz and two receive antennas, the proposed scheme outperforms 2×2 V-BLAST by at least 3.8 dB in energy consumption.

关键词： Radio frequency Energy consumption Correlation Fading Constellation diagram Transmitters

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A power saving dual-hop architecture based on hybrid spatial modulation

A power saving dual-hop architecture based on hybrid spatial...

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Asilomar Conference on signals, Systems & Computers

作者： Athanasios Stavridis Sinan Sinanović Marco Di Renzo Harald Haas Institute for Digital Communications Joint Research Institute for Signal and Image Processing School of Engineering University of Edinburgh UK Laboratory of Signals and Systems (L2S) French National Center for Scientific Research (CNRS) école Superieure d'EJectricite (SUPELEC) University of Paris-Sud XI France

ISBN: (纸本)9781467350501

In this paper, we propose a novel Dual-Hop Decode-and-Forward (DF) architecture based on Multiple-Input Multiple-Output (MIMO) Zero Forcing (ZF) precoding and Spatial Modulation (SM) that employs a centralized or a distributed detection algorithm at the Relay Nodes (RNs). Using Tikhonov Regularization (TR) we form a precoding technique that turns out to reduce significantly the transmitted power at the Source Node (SN) under certain scenarios. Moreover, the use of TR enables our scheme to communicate in channels with low and medium correlation at the first hop without a Bit Error Rate (BER) penalty. Finally, we extend our scheme in order to take into account realistic Channel State Information (CSI) at the the Source Node (SN).

关键词： TR ZF MIMO

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The UC4G wireless MIMO testbed

The UC4G wireless MIMO testbed

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2012 IEEE Global Communications Conference (GLOBECOM)

作者： Pat Chambers Xuemin Hong Zengmao Chen Cheng-Xiang Wang Mark Beach Harald Haas Joint Research Institute for Signal and Image Processing Heriot-Watt University Edinburgh UK School of Information Science and Technology Xiamen University Xiamen Fujian China Department of Electrical & Electronic Engineering University of Bristol Bristol UK University of Edinburgh Edinburgh UK

ISBN: (纸本)9781467309202

This paper presents a wireless multiple-input/multiple-output (MIMO) testbed for the UK-China Science Bridges Project: R&D on Beyond Fourth Generation (B4G) Wireless Mobile Communications (UC4G). An introductory review of other approaches is first presented and then subsequently the motivation, architecture and specifications of the UC4G testbed are outlined. The flexibility of operation, versatility of function and modular design of the UC4G testbed are shown to be its key benefits.

关键词： REMEDIAL DESIGN MODULAR DESIGN Flexibility Specifications multiple input multiple output systems wireless Wireless mobile communication

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Transmission energy consumption in MIMO systems under inter-cell interference

Transmission energy consumption in MIMO systems under inter-...

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Wireless Advanced

作者： Ku, Ivan Wang, Cheng-Xiang Thompson, John Grant, Peter Joint Research Institute for Signal and Image Processing Heriot-Watt University Edinburgh EH14 4AS United Kingdom Joint Research Institute for Signal and Image Processing University of Edinburgh Edinburgh EH9 3JL United Kingdom

ISBN: (纸本)9781457701092

We investigate the base station (BS) downlink transmission energy for a multiple-input multiple-output (MIMO) communication system operating under an inter-cell interference environment with the receiver equipped with interference cancellation (IC) capability. It is demonstrated that, besides the number of antennas, receiver IC techniques can have an influence on the required BS transmission energy of a MIMO communication system. Specifically, the choice of receiver IC technique impacts the transmission energy more when the number of receive antennas is small. On the other hand, the transmission energy converges to a minimum value regardless of the type of receiver IC technique used when the number of receive antennas is large enough. We also show that inter-cell interference contributed by adjacent BSs have a detrimental effect on the performance of traditional IC techniques, causing the desired BS to use higher transmission energy to maintain the signal quality. © 2011 IEEE.

关键词： Energy efficiency

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Transmit Precoding for Receive Spatial Modulation Using Imperfect Channel Knowledge

Transmit Precoding for Receive Spatial Modulation Using Impe...

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IEEE Vehicular Technology Conference

作者： Athanasios Stavridis Sinan Sinanovi? Marco Di Renzo Harald Haas Institute for Digital Communications Joint Research Institute for Signal and Image Processing School of Engineering The University of Edinburgh EH9 3JL Edinburgh UK Laboratory of Signals and Systems (L2S) French National Center for Scientific Research (CNRS) E?ole Supérieure d'électricité (SUPéLEC) University of Paris-Sud XI (UPS) 3 rue Joliot-Curie 91192 Gif-sur-Yvette (Paris) France

ISBN: (纸本)9781467309899

In this paper, motivated by the relatively new concept of Spatial Modulation (SM), we are addressing the problem of Receive-Spatial Modulation (R-SM) under two cases of imperfect channel knowledge at the transmitter side. In the first case, we adopt a statistical model for the channel uncertainties, whereas in the second one a worst-case approach is followed and the channel uncertainties are expressed as a bounded set. Based on Zero-Forcing (ZF) precoding and using standard tools from optimization theory, we derive closed form solutions that turn out to be robust. Simulation results show that the proposed schemes have a performance close to the perfect channel knowledge scenario in low and mid-low SNRs. Furthermore, these designs can be applied to wide range of channels with different correlation states combined with a transmit power gain.

关键词： Transmit Precoding Receive Spatial Modulation Imperfect Channel Knowledge

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