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Spectral-energy efficiency tradeoff in Cognitive Radio networks with peak interference power constraints

Spectral-energy efficiency tradeoff in Cognitive Radio netwo...

引用

2011 IEEE 13th International Conference on Communication Technology, ICCT 2011

作者： Haider, Fourat Wang, Cheng-Xiang Hong, Xuemin Haas, Harald Yuan, Dongfeng Hepsaydir, Erol 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 School of Information Science and Engineering Shandong University Jinan 250100 China Hutchison 3G UK 20 Grenfell Rd. Maidenhead SL6 1EH United Kingdom

ISBN: (纸本)9781612843070

Cognitive Radio (CR) is considered as one of the prominent techniques to improve the spectrum utilization by opportunistically sharing the radio spectrum resources with licensed users. This paper concentrates on characterizing the spectral-energy efficiency tradeoff in low and high signal-to-noise ratio (SNR) regimes for interference-tolerant CR networks under peak interference power constraints and in different fading environments. The analysis has been conducted under an assumption that perfect channel state information (CSI) of both primary and secondary receivers is available at the secondary transmitter. Our analysis proves that, in the low SNR regime, the minimum energy per bit required for reliable transmission is characterized by the supremum of the CR fading channel. © 2011 IEEE.

关键词： Cognitive radio

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Minimal average consumption downlink base station power control strategy

Minimal average consumption downlink base station power cont...

引用

IEEE International Symposium on Personal, Indoor and Mobile Radio Communications

作者： Hauke Holtkamp Gunther Auer Harald Haas DOCOMO Euro-Labs Institute for Digital Communications Joint Research Institute for Signal and Image Processing The University of Edinburgh

ISBN: (纸本)9781457713460

We consider single cell multi-user OFDMA down-link resource allocation on a flat-fading channel such that average supply power is minimized while fulfilling a set of target rates. Available degrees of freedom are transmission power and duration. This paper extends our previous work on power optimal resource allocation in the mobile downlink by detailing the optimal power control strategy investigation and extracting fundamental characteristics of power optimal operation in cellular downlink. We find that only a system wide allocation of transmit powers is optimal rather than on link level. The allocation strategy that minimizes overall power consumption requires the transmission power on all links to be increased if only one link degrades. Furthermore, we show that for mobile stations with equal channels but different rate requirements, it is power optimal to assign equal transmit powers with proportional transmit durations. To relate the effectiveness of power control to live operation, we take the power model into consideration which maps transmit power to supply power. We show that due to the affine mapping, the solution is independent of the power model. However, the effectiveness of power control measures is completely dependent on the underlying hardware and the load dependence factor of a base station (instead of absolute consumption values). Finally, we conclude that power control measures in base stations are most relevant in macro stations which have load dependence factor of more than 50%.

关键词： powered models power transmission Power control Downlink Transmitter power Power (Psychology) Energy sources BASE STATION Affine transformation TRANSMITTING flat fading channel link level Resource utilization STATIONS mobile station

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Spectral efficiency analysis of mobile Femtocell based cellular systems

Spectral efficiency analysis of mobile Femtocell based cellu...

引用

2011 IEEE 13th International Conference on Communication Technology, ICCT 2011

作者： Haider, Fourat Wang, Cheng-Xiang Haas, Harald Yuan, Dongfeng Wang, Haiming Gao, Xiqi You, Xiao-Hu Hepsaydir, Erol 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 School of Information Science and Engineering Shandong University Jinan 250100 China School of Information Science and Engineering Southeast University Nanjing 210096 China Hutchison 3G UK 20 Grenfell Rd. Maidenhead SL6 1EH United Kingdom

ISBN: (纸本)9781612843070

In this paper, we propose a new concept called mobile Femtocell (MFemtocell) network, which can be considered as a practical implementation of mobile relays (more precisely, moving networks). MFemtocells can be deployed in moving vehicles, such as trains, buses, or private cars to provide enhanced user throughput, extended coverage, and reduction of the signaling overhead and drop calls. We investigate the spectral efficiency of cellular systems with MFemtocell deployment and two resource partitioning schemes. Simulation results demonstrate that with the deployment of MFemtocells, the spectral efficiency and average user throughput can significantly be increased while the signaling overhead is reduced. © 2011 IEEE.

关键词： Cost reduction

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Spectral Efficiency Analysis of Mobile Femtocell Based Cellular Systems

Spectral Efficiency Analysis of Mobile Femtocell Based Cellu...

引用

2011 IEEE 13th International Conference on Communication Technology(ICCT 2011)

作者： Fourat Haider Harald Haas Erol Hepsaydir Joint Research Institute for Signal and Image Processing Heriot-Watt UniversityEdinburgh EH14 4ASUK

In this paper,we propose a new concept called mobile Femtocell (MFemtocell) network,which can be considered as a practical implementation of mobile relays (more precisely,moving networks).MFemtocells can be deployed in moving vehicles,such as trains,buses,or private cars to provide enhanced user throughput,extended coverage,and reduction of the signaling overhead and drop *** investigate the spectral efficiency of cellular systems with MFemtocell deployment and two resource partitioning *** results demonstrate that with the deployment of MFemtocells,the spectral efficiency and average user throughput can significantly be increased while the signaling overhead is reduced.

关键词： Femtocell Spectral Efficiency Analysis of Mobile Femtocell Based Cellular Systems Mobile

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On Minimizing Base Station Power Consumption

On Minimizing Base Station Power Consumption

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IEEE Conference on Vehicular Technology (VTC)

作者： Hauke Holtkamp Gunther Auer Harald Haas DOCOMO Euro Laboratories Munich Germany Institute for Digital Communications Joint Research Institute for Signal and Image Processing University of Edinburgh Edinburgh UK

We consider resource allocation over a wireless downlink where Base Station (BS) power consumption is minimized while upholding a set of required link rates. A Power and Resource Allocation Including Sleep (PRAIS) method is proposed that combines resource sharing, Power Control (PC), and Discontinuous Transmission (DTX), such that downlink power consumption is minimized, which can be formed into a convex optimization problem. Unlike conventional approaches that aim at minimizing transmit power, in this work the BS mains supply power is chosen as the relevant metric. Based on a linear power model, which maps a certain transmit power to the necessary mains supply power, we quantify the fundamental limits of PRAIS in terms of achievable BS power savings. The fundamental limits are numerically evaluated on link level for four sets of BS power model parameters representative of envisaged future hardware developments. We establish an expected lower limit for PRAIS of 27W to 68W depending on load per link for BSs installed in 2014, which provides a 61% to 34% gain over conventional resource allocation schemes.

关键词： Power demand Load modeling Bandwidth Adaptation models Resource management IEEE 802.16 Standards Time division multiple access

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Spectral-Energy Efficiency Tradeoff in Cognitive Radio Networks with Peak Interference Power Constraints

Spectral-Energy Efficiency Tradeoff in Cognitive Radio Netwo...

引用

2011 IEEE 13th International Conference on Communication Technology(ICCT 2011)

作者： Fourat Haider Harald Haas Erol Hepsaydir Joint Research Institute for Signal and Image Processing Heriot-Watt UniversityEdinburgh EH14 4ASUK.

Cognitive Radio (CR) is considered as one of the prominent techniques to improve the spectrum utilization by opportunistically sharing the radio spectrum resources with licensed *** paper concentrates on characterizing the spectral-energy efficiency tradeoff in low and high signal-tonoise ratio (SNR) regimes for interference-tolerant CR networks under peak interference power constraints and in different fading *** analysis has been conducted under an assumption that perfect channel state information (CSI) of both primary and secondary receivers is available at the secondary *** analysis proves that,in the low SNR regime,the minimum energy per bit required for reliable transmission is characterized by the supremum of the CR fading channel.

关键词： SNR Spectral-Energy Efficiency Tradeoff in Cognitive Radio Networks with Peak Interference Power Constraints Radio

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Cross-Layer Interference Mitigation for Cognitive Radio MIMO Systems

Cross-Layer Interference Mitigation for Cognitive Radio MIMO...

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IEEE International Conference on Communications (ICC)

作者： Zengmao Chen Cheng-Xiang Wang Xuemin Hong John Thompson Sergiy A. Vorobyov Dongfeng Yuan Joint Research Institute of Signal and Image Processing Heriot-Watt University Edinburgh UK Joint Research Institute of Signal and Image Processing University of Edinburgh Edinburgh UK Department of Electrical and Computer Engineering University of Alberta Edmonton AB Canada School of Information Science and Engineering Shandong University Jinan Shandong China

In this paper, we investigate the interference mitigation from a cross-layer perspective for a cognitive radio (CR) multiple-input multiple-output (MIMO) network coexisting with a primary time-division-duplexing (TDD) system. The channel allocation in the media access control (MAC) layer and a subspace-based precoding scheme in the physical layer of the CR network are jointly considered to minimise the interference to the primary user and maximise the CR throughput. Two distributed cross-layer algorithms, namely, joint iterative channel allocation and precoding (JICAP) and non-iterative channel allocation and precoding (NICAP), are proposed for the cases with and without channel information among CR nodes, respectively. Moreover, a channel estimation scheme is also proposed to enable the NICAP. The effectiveness of the proposed algorithms over non-cross-layer counterpart is demonstrated via simulations.

关键词： Channel allocation Downlink Interference channels Channel estimation Covariance matrix Physical layer

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Uplink interference protection and fair scheduling for power efficient OFDMA networks

Uplink interference protection and fair scheduling for power...

引用

International Workshop on Multi-Carrier Systems & Solutions (MC-SS)

作者： Harald Burchardt Zubin Bharucha Harald Haas Gunther Auer Institute of Digital Communications Joint Research Institute of Signal and Image Processing University of Edinburgh Edinburgh UK DoCoMo Conimunications Laboratories Europe GmbH Munich Germany

In this paper a new method for uplink inter-cell interference coordination (ICIC) in a full frequency reuse system is proposed. The technique is named uplink interference protection (ULIP). ULIP exploits existing reference signals transmitted by all base stations (BSs). The fact that path loss and lognormal shadowing can be considered reciprocal in such frequency-division duplex (FDD) systems is exploited. Therefore, no additional signalling is required for a new mobile station (MS) to estimate the level of inter-cell interference it would cause to ongoing uplink transmissions in neighbouring cells. Using the acquired knowledge, MSs can adjust their transmit power to ensure that existing links are not forced into outage. A scheduling scheme is suggested in which a fair allocation of priority resource blocks (RBs), based on user signal-to-interference-plus-noise ratios (SINRs), enhances both cell-edge throughput and user throughput fairness. Through this, also significant system throughput gains are generated. Finally, it is demonstrated that as a side effect of the interference reductions, considerable energy savings can be achieved.

关键词： Interference signal to noise ratio Throughput Resource management OFDM Phase shift keying Computer architecture

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Impact of Receiver Interference Cancellation Techniques on the Base Station Power Consumption in MIMO Systems with Inter-Cell Interference

Impact of Receiver Interference Cancellation Techniques on t...

引用

IEEE International Symposium on Personal, Indoor and Mobile Radio Communications

作者： Ivan Ku Cheng-Xiang Wang John Thompson Peter Grant 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)9781457713460

In this paper, we investigate the impact of receiver interference cancellation (IC) techniques on the base station (BS) downlink transmission power for a multiple-input multiple-output (MIMO) communication system with inter-cell interference. Besides the power amplifier module whose power consumption is determined by the required transmission power, we also consider the signal processing module when characterizing the total power consumption of the BS. Rather than specifying absolute values, we define the power consumption of the signal processing module as a proportion of the power consumption of the power amplifier module. We investigate the influence of both the signal processing module and receiver IC techniques on the total power consumption of the BS. Results show that besides receiver IC techniques, the power consumed at the signal processing module should not be overlooked when evaluating the BS total power consumption. Particularly, when the power consumption of the signal processing module becomes too dominant, it may contribute more to the increase of the BS total power consumption as compared to the additional power needed by the power amplifier module to combat inter-cell interference. Furthermore, any transmission power savings that are potentially obtained from receive diversity gain and receiver IC techniques may not be justified if the signal processing consumes too much power relative to that of the power amplifier.

关键词： Energy efficiency Inter-cell interference Interference cancellation MIMO

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Secrecy Rate of Time Switched Transmit Diversity System

Secrecy Rate of Time Switched Transmit Diversity System

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IEEE Conference on Vehicular Technology (VTC)

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

Time switched transmit diversity (TSTD) system uses only one out of several transmit antennas at a time in order to exploit the benefit of transmit diversity while keeping the system simple by having only one RF chain. We show that while average rate of such a system remains similar to the capacity of the single transmit antenna, outage secrecy capacity is greatly improved. In particular, as the number of transmit antenna is increased or outage probability decreased, the gains over single antenna system improve significantly - gains of over 20 dB with respect to the single antenna system are achieved for 1% outage rate. Furthermore, the probability of existence of secrecy capacity is improved as well for cases when the main channel has higher SNR than the eavesdropper channel.

关键词： Transmitting antennas signal to noise ratio Wireless communication Gain Capacity planning Fading

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