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Fractional Frequency Reuse in Optical Wireless Cellular Networks

Fractional Frequency Reuse in Optical Wireless Cellular Netw...

引用

IEEE International Symposium on Personal, Indoor and Mobile Radio Communications

作者： Cheng Chen Nikola Serafimovski Harald Haas Institute for Digital Communications Joint Research Institute for Signal and Image Processing The University of Edinburgh EH9 3JL Edinburgh UK

ISBN: (纸本)9781467362337

Interference coordination in optical wireless cellular networks using different frequency reuse techniques are discussed and compared in this paper. On the one hand, full frequency reuse maximises the system throughput at the cost of poor celledge user performance. On the other hand, cluster-based static resource partitioning offers good cell-edge user performance at the cost of low system throughput. Fractional frequency reuse (FFR) is introduced as a compromise between cell-edge user performance and the system throughput with low system complexity. Simulation results show that a guaranteed user throughput of 5.6 Mbps and an average area spectral efficiency (ASE) of 0.3389 bps/Hz/m~2 are achieved by the FFR optical wireless system with appropriate power control factors. These results show considerable throughput improvement compared to both benchmark systems. It is also shown that by adjusting the LED transmission optical power of a system using visible light spectrum, the illumination requirement for an office room can be satisfied without extra lighting facilities.

关键词： optical wireless communications fractional frequency reuse co-channel interference and orthogonal frequency division multiple access

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Exploiting User Movement Patterns to Enhance Energy Efficiency in Wireless Networks

Exploiting User Movement Patterns to Enhance Energy Efficien...

引用

IEEE International Symposium on Personal, Indoor and Mobile Radio Communications

作者： Stefan Videv John S. Thompson Harald Haas Institute for Digital Communications Joint Research Institute for Signal and Image Processing The University of Edinburgh EH9 3JL Edinburgh UK

ISBN: (纸本)9781467362337

This paper presents an initial study on how to model user mobility in a wireless cellular network scenario. The model provides realistic patterns of movement between a number of locations. The aforementioned mobility model is built upon to introduce a base station (BS) energy efficient power state control algorithm (EESC) that is able to provide significant energy savings for the simulated scenario. Erratic subsequent on and off BS behavior is avoided by referring to an average loading curve, generated for each BS during a learning period, when making decisions. Moreover, BSs are turned off only when the users can be handed off to nearby cells with a predefined maximum allowed predicted loss in data rate. The resulting system is able to deliver an energy consumption reduction between 36% and 11% over an always on benchmark for the simulated scenarios. There is negligible loss in terms of achieved data rate per user.

关键词： Patterns Enhance benchmark

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A Comparison between DCO-OFDMA and Synchronous One-Dimensional OCDMA for Optical Wireless Communications

A Comparison between DCO-OFDMA and Synchronous One-Dimension...

引用

IEEE International Symposium on Personal, Indoor and Mobile Radio Communications

作者： John Fakidis Dobroslav Tsonev Harald Haas Institute for Digital Communications Joint Research Institute for Signal and Image Processing The University of Edinburgh EH9 3JL Edinburgh UK

ISBN: (纸本)9781467362337

In this paper, a comparison between direct-current-biased optical orthogonal frequency-division multiple-access (DCO-OFDMA) and synchronous one-dimensional (1-D) optical code-division multiple-access (OCDMA) is performed for optical wireless communication (OWC). Line-of-sight (LOS) channel conditions are considered in an indoor downlink scenario. The bit-error ratio (BER) performance is investigated in an additive white Gaussian noise (AWGN) channel under the conditions of equal spectral and power efficiency. For DCO-OFDMA and 1-D OCDMA, the negative-level clipping effect and multiple-access interference (MAI) are considered, respectively. For the OCDMA scheme, the categories of optical orthogonal codes (OOCs) and unipolar Walsh-Hadamard codes (WHCs) are employed. The time-division multiple-access (TDMA) is also represented in the context of synchronous OCDMA by the use of identity matrices. In order to enhance the 1-D OCDMA spectral efficiency, unipolar M-ary pulse amplitude modulation (M-PAM) is employed. The BER performance versus the average electrical signal-to-noise ratio (SNR) per bit is illustrated both for the single and the multiple-user communication using Monte Carlo simulations.

关键词： Comparison between DCO-OFDMA Synchronous One-Dimensional OCDMA Optical Wireless Communications

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Direct Transmit Antenna Selection for Transmit Optimized Spatial Modulation

Direct Transmit Antenna Selection for Transmit Optimized Spa...

引用

IEEE Vehicular Technology Conference

作者： Xiping Wu 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 French National Centre for Scientific Research (CNRS) Laboratory for Signals and Systems (LSS) école Supérieure d'électricité (SUPELEC) 3 rue Joliot-Curie 91192 Gif-sur-Yvette (Paris) France

ISBN: (纸本)9781467361866

To improve the performance of spatial modulation (SM) over correlated MIMO channels, transmit optimized spatial modulation (TOSM) has been proposed recently. It trades off traditional signal constellation diagrams with spatial constellation diagrams to minimize the average bit error probability (ABEP). After the optimum number of transmit antennas is determined, the specific antennas need to be carefully chosen from the entire array to provide a minimum ABEP. Like in conventional transmit antenna selection (TAS) schemes, the problem can be solved by an exhaustive search. However, this results in an unaffordable complexity especially when the spectral efficiency is high. In this paper, we propose a creative TAS approach for TOSM. Given a required number of antennas, the novel technique determines the selection solution based on circle packing. Simulation results show that for various channel correlations and spectral efficiencies, the proposed method achieves performance results close to exhaustive search with a gap of less than 0.3 dB. The complexity is reduced to an extremely low level.

关键词： Realistic circle packing (RCP) transmit antenna selection (TAS) transmit optimized spatial modulation (TOSM) correlated MIMO average bit error probability (ABEP)

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An enhanced solutioning design for military tactical voice communication systems

An enhanced solutioning design for military tactical voice c...

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2012 7th IEEE Conference on Industrial Electronics and Applications, ICIEA 2012

作者： Lim, Wee-Tong Singh, Hargobind Sinanović, Sinan Haas, Harald Faculty of Engineering National University of Singapore Singapore Singapore Joint Research Institute for Signal and Image Processing University of Edinburgh United Kingdom

ISBN: (纸本)9781457721175

Great emphasis has always been placed on military communication especially in the wireless spectrum. There is a need for more robust links with higher probability of intercept at the reception end and lower bit error rate (BER) at the transmission front. This is coupled with the requirement to have minimum exposure to loss or distortion of information. In this paper, we propose an enhanced solutioning design based on receiver and transmitter implementation to develop a wider encompassing solution. The receiver implementation will include the integration of a Speech Enhancement System (SES) where methods for noise estimation and reduction will be briefly introduced. The emphasis is on the employment of Arc-Tangent Square Root (ATSR) nonlinear device in the speech enhancement module for harmonic regeneration. For transmitter implementation, we propose a new modulation scheme - Simultaneous Spatial Modulation (SSM) - that reduces power consumption for the same bit error rate (BER) or given the same power, reduces transmission error, thereby increasing the rate of effective communication. Simulation results are presented to verify the effectiveness of the proposed modulation scheme. © 2012 IEEE.

关键词： Transmitters

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Energy Evaluation of Spatial Modulation at a Multi-Antenna Base Station

Energy Evaluation of Spatial Modulation at a Multi-Antenna B...

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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 Edinburgh UK School of Engineering and Built Environment Glasgow Caledonian University Glasgow UK Laboratory of Signals and Systems (L2S) French National Center for Scientific Research (CNRS) école Supérieure d'électricité (SUPéLEC) University ofParis-Sud XI (UPS) Paris France

ISBN: (纸本)9781467361866

In this paper, we aim to study the Energy Efficiency (EE) of Spatial Modulation (SM) at different Base Stations (BSs) taking into account the total power consumption. Compared to conventional Multiple-Input Multiple-Output (MIMO) schemes, SM benefits from a single Radio Frequency (RF) chain which results in decreased power supply (W), higher EE (Mbits/J), and reduced complexity. Using the fundamental limits of Shannon capacity, we show that SM achieves a range of average data rates with only a fraction, which can be as low as 24% for four transmit antennas, of the total power supply of conventional MIMO. In addition, we demonstrate that the EE of the studied schemes is maximized for a certain average data rate and that SM achieves the highest EE among them. Finally, we note that a BS employing SM can be up to 67% more energy efficient compared to a BS under a conventional MIMO transmission scheme, for four transmit antennas.

关键词： EE SM BSs

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Spectral-Energy Efficiency Tradeoff in Multicell Cellular Networks with Adaptive Relay Cooperation

Spectral-Energy Efficiency Tradeoff in Multicell Cellular Ne...

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IEEE Global Communications Conference

作者： Ivan Ku Cheng-Xiang Wang John Thompson Joint Research Institute for Signal and Image Processing Heriot-Watt University Joint Research Institute for Signal and Image Processing University of Edinburgh

ISBN: (纸本)9781467309202

By observing that the relay stations (RSs) will receive a signal replica of the users' transmissions during the broadcast phase, we propose an adaptive relay cooperation scheme. The RSs will utilize the readily available signal replica and the additional diversity naturally inherent in them to either perform cooperative multipoint (COMP) relaying or remain silent with only the direct transmission being considered. We investigate this scheme in a 7 cell network to demonstrate system level capacity and energy efficiency improvements. Results show that the proposed scheme outperforms the conventional adaptive relay scheme and is able to benefit from the more aggressive full bandwidth frequency reuse plan at low relay transmit power.

关键词： Green communication Adaptive relay cooperation MIMO Spectral-energy efficiency tradeoff multiple input multiple output systems relay SPECTRAL ENERGY Transmitter power Cellular networks multicell Self tuning Scheme tradeoffs

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Optimum signal Shaping in OFDM-based Optical Wireless Communication Systems

Optimum Signal Shaping in OFDM-based Optical Wireless Commun...

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IEEE Vehicular Technology Conference

作者： Svilen Dimitrov Harald Haas Institute for Digital Communications Joint Research Institute for Signal and Image Processing The University of Edinburgh

ISBN: (纸本)9781467318808

In this paper, a framework for optimum signal shaping in multi-carrier modulation is presented for optical wireless communications (OWC). The two fundamental multi-carrier transmission schemes based on orthogonal frequency division multiplexing (OFDM), direct-current-biased optical OFDM (DCO-OFDM) and asymmetrically clipped optical OFDM (ACO-OFDM), are studied. The optimum signal shaping is denned as optimum biasing and optimum scaling of the time domain signal within the optical power constraints of the transmitter front-end. These include the boundaries of the limited linear dynamic range, such as minimum and maximum radiated optical power, and the desired average optical power level. As a result, the minimum required electrical signal-to-noise ratio (SNR) to maintain a target bit-error ratio (BER) is obtained for a desired multilevel quadrature amplitude modulation (M-QAM) scheme and a given combination of optical power constraints. The average optical power is varied over dynamic ranges of 10 dB, 20 dB and 30 dB. With the increase of the dynamic range and for a major portion of the average optical power levels, DCO-OFDM demonstrates a lower minimum electrical SNR requirement for a target BER as compared to ACO-OFDM for modulation orders with similar spectral efficiencies.

关键词： signal shaping Optimization DCO-OFDM ACO-OFDM Optical wireless communication signal shaping average optical power signal to noise ratios Orthogonal frequency division multiplexing Dynamic range Wireless communication systems TIME-DOMAIN Multicarrier modulation Optical wireless multilevel quadrature amplitude modulation Optimum optical

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Novel Unipolar Orthogonal Frequency Division Multiplexing (U-OFDM) for Optical Wireless

Novel Unipolar Orthogonal Frequency Division Multiplexing (U...

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IEEE Conference on Vehicular Technology (VTC)

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

A novel modulation technique coined U-OFDM is proposed. U-OFDM uses different time sample states and an innovative rearrangement of the Orthogonal Frequency Division Multiplexing (OFDM) frame which allow for the creation of unipolar OFDM signals required for Optical Wireless Communication (OWC) with Light Emitting Diodes (LEDs). In comparison to similar techniques like DC-biased Optical OFDM (DCO-OFDM) and Asymmetrically Clipped Optical OFDM (ACO-OFDM), U-OFDM is both optically and electrically more power efficient in an Additive White Gaussian Noise (AWGN) channel, which is prevalent in an optical wireless system.

关键词： OFDM Wireless communication Time domain analysis Demodulation Bit error rate Optical receivers

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Energy efficient resource allocation in wireless systems with control channel overhead

Energy efficient resource allocation in wireless systems wit...

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IEEE Wireless Communications and Networking Conference Workshops (WCNCW)

作者： Stefan Videv Harald Haas John S. Thompson Peter M. Grant School of Engineering Joint Research Institute for Signal and Image Processing University of Edinburgh Edinburgh UK

This paper presents a novel resource scheduling technique named Time Compression Mode (TCoM) that allows energy aware schedulers to decrease the energy consumption within orthogonal frequency division multiple access (OFDMA) type systems - for example the Long Term Evolution (LTE) system. TCoM allows users whose energy consumption is dominated by control channel overhead, to reduce their overall energy expenditure by reducing the number of resource blocks (RBs) allocated to them. This leads to an overall reduction in the used energy due to the decrease in energy used for overhead transmission. To ensure correct operation, TCoM has to be coupled with an energy aware scheduler. This combination not only reduces the used energy, but is also able to increase the achieved user data rate. Simulation results show that the data rate performance is equivalent for 86.8% of the users, however the remaining 13.2% enjoy approximately double the data rate delivered by the benchmark. The overall used energy is decreased by 26% on average. These results are achieved for an future base station (BS) overall hardware efficiency model.

关键词： Resource management Interference Radio frequency Modulation signal to noise ratio Hardware Energy consumption

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