| 1. |
- Agnihotri, Mohit, et al.
(author)
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Topology formation in mesh networks considering role suitability
- 2016
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In: IEEE Wireless Communications and Networking Conference, WCNC. - : IEEE. - 9781467398145
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Conference paper (peer-reviewed)abstract
- The paper studies various mesh topology formation techniques that can be used to aid the development of large-scale capillary networks. The work focuses on how mesh networks can be established using Bluetooth Low Energy exploiting the heterogeneous characteristics of the devices in the network. A novel algorithm called Topology Formation considering Role Suitability (TFRS) is proposed aiming to maximize the network lifetime. The algorithm employs a newly introduced metric called role suitability metric (RSM) to assign the best role among master, relay and slave to a participating device. The RSM metric is computed from device characteristics including, but not limited to, energy, mobility and computational capability. We use systemlevel simulation to evaluate the performance of the proposed algorithm against a reference under a homogeneous deployment scenario consisting of heterogeneous devices. Results show that the network lifetime can be improved significantly when the topology is formed considering the device characteristics for both master role selection and relay selection. TFRS can achieve 20% to 40% higher network lifetime depending on the deployment characteristics over the reference algorithm.
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| 2. |
- Hu, Sha, et al.
(author)
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Comparison of two channel shortening approaches for MIMO-ISI channels
- 2016
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In: 2016 IEEE Wireless Communications and Networking Conference, WCNC 2016. - 9781467398152 - 9781467398145
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Conference paper (peer-reviewed)abstract
- We consider a multiple-input multiple-output (MIMO) channel with inter-symbol interference (ISI) where signal detection is highly complex due to the large signal state-space dimensionality. A common strategy is to apply a front-end filter (FEF) to eliminate the ISI dimension (i.e. full ISI equalization). This FEF is then followed by a frequency non-selective MIMO detector. However, another, much less researched, strategy is to apply an FEF that eliminates the MIMO dimension and results in a set of parallel ISI channels followed by a bank of parallel single-input single-output (SISO) detectors. Which of the two strategies is better in a Shannon capacity sense? In this paper, we show that the answer to this question depends on system parameters such as SNR, number of antennas, ISI duration, and spatial correlation properties.
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| 3. |
- Makki, Behrooz, 1980, et al.
(author)
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A joint power and information transfer system using retransmissions
- 2016
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In: IEEE Wireless Communications and Networking Conference, WCNC. - 1525-3511. - 9781467398145 ; 2016-September, s. 7565010-
-
Conference paper (peer-reviewed)abstract
- In this paper, we develop a green joint power and information transfer system. To guarantee reliable communication, we implement hybrid automatic repeat request (HARQ) feedback both in the power and information transmission phases. Moreover, with a limit on the packet transmission delay, we derive the optimal power allocation minimizing the energy-constrained outage probability. The simulation and analytical results indicate that the diversity gain of the joint power and information transfer system is the same as the diversity gain of the conventional non-green information transfer systems. Also, the implementation of HARQ improves the power efficiency significantly. For instance, consider a Rayleigh fading channel, outage probability 10-3, code rate 1 nats-per-channel-use and the case where the receiver requires to receive 0.1 Joule-per-channel-use energy per codeword length from the transmitter to process the information. Then, with a maximum of two retransmissions in the power and information transfer phases, the HARQ reduces the average required energy by 4 dB, compared to the open-loop communication setup.
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| 4. |
- Mushtaq, Muhammad Sajid, et al.
(author)
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QoE in 5G Cloud Networks using Multimedia Services
- 2016
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In: 2016 IEEE WIRELESS COMMUNICATIONS AND NETWORKING CONFERENCE. - : IEEE Computer Society. - 9781467398145
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Conference paper (peer-reviewed)abstract
- The 4G standard Long Term Evolution-Advanced(LTE-A) has been deployed in many countries. Now, technologyis evolving towards the 5G standard since it is expecting tostart its service in 2020. The 5G cellular networks will mainlycontain in cloud computing and primarily Quality of Service(QoS) parameters (e.g. delay, loss rate, etc.) influence thecloud network performance. The impact of user perceivedQuality of Experience (QoE) using multimedia services, andapplication significantly relies on the QoS parameters. The keychallenge of 5G technology is to reduce the delay less thanone millisecond. In this paper, we have described a methodthat minimizes the overall network delay for multimediaservices; which are constant bit rate (VoIP) and variablebit rate (video) traffic model. We also proposed a methodthat measures the user’s QoE for video streaming trafficusing the network QoS parameters, i.e. delay and packet lossrate. The performance of proposed QoE method is comparedwith QoV method, and our proposed QoE method performsbest by carefully handle the impact of QoS parameters. Theresults show that our described method successfully reduces theoverall network delays, which result to maximize the user’s QoE.
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| 5. |
- Poulimeneas, Dimitrios, et al.
(author)
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Delay-and diversity-Aware buffer-Aided relay selection policies in cooperative networks
- 2016
-
In: 2016 IEEE Wireless Communications and Networking Conference. - : Institute of Electrical and Electronics Engineers (IEEE). - 1525-3511. - 9781467398145
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Conference paper (peer-reviewed)abstract
- In this paper, we propose novel relay selection policies that aim at reducing the average delay by incorporating the buffer size of the relay nodes into the relay selection process. More specifically, we propose two delay-Aware protocols that are based on the max-link relay selection protocol. First, a delay-Aware only approach while it reduces the delays considerably it starves the buffers and increases the outage probability of the system. Towards this end, we propose a delay-and diversity-Aware buffer-Aided relay selection policy that aims at reducing the average delay considerably and at the same time maintaining good diversity. The protocols are analyzed by means of Markov Chains and expressions for the outage, throughput and delay are derived. The performance and use of our proposed algorithms is demonstrated via extensive simulations and comparisons.
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| 6. |
- Tran, Hung Vinh, et al.
(author)
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On Throughput and Quality of Experience in Cognitive Radio Networks
- 2016
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In: 2016 IEEE WIRELESS COMMUNICATIONS AND NETWORKING CONFERENCE. - : IEEE. - 9781467398145
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Conference paper (peer-reviewed)abstract
- In this paper, a performance analysis for cognitive radio networks (CRNs) under the outage probability constraint of the primary user and peak transmit power constraint of the secondary user is conducted. Given an automatic repeat request protocol, analytical expressions for the packet delay and throughput of the CRN are derived. Most importantly, these expressions can be used to understand the quality of experience on web services which are assumed to be offered by the considered CRN.
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| 7. |
- Yajnanarayana, Vijaya, et al.
(author)
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IR-UWB detection and fusion strategies using multiple detector types
- 2016
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In: IEEE Wireless Communications and Networking Conference, WCNC. - : Institute of Electrical and Electronics Engineers (IEEE). - 9781467398145
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Conference paper (peer-reviewed)abstract
- Optimal detection of ultra wideband (UWB) pulses in a UWB transceiver employing multiple detector types is proposed and analyzed in this paper. To enable the transceiver to be used for multiple applications, the designers have different types of detectors such as energy detector, amplitude detector, etc., built in to a single transceiver architecture. We propose several fusion techniques for fusing decisions made by individual IR-UWB detectors. In order to get early insight into theoretical achievable performance of these fusion techniques, we assess the performance of these fusion techniques for commonly used detector types like matched filter, energy detector and amplitude detector under Gaussian assumption. These are valid for ultra short distance communication and in UWB systems operating in millimeter wave (mmwave) band with high directivity gain. In this paper, we utilize the performance equations of different detectors, to device distinct fusion algorithms. We show that the performance can be improved approximately by 4 dB in terms of signal to noise ratio (SNR) for high probability of detection of a UWB signal (> 95%), by fusing decisions from multiple detector types compared to a standalone energy detector, in a practical scenario.
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