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Elektronik ve Haberleşme Mühendisliği Bölümü Yayın Koleksiyonu

Permanent URI for this collectionhttps://hdl.handle.net/20.500.12416/260

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Browsing Elektronik ve Haberleşme Mühendisliği Bölümü Yayın Koleksiyonu by Author "17573"

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    Publication
    Citation Count: Şafak, A; Preveze, B., "Analysis of delay factors for voice over WiMAX", 23rd International Symposium On Computer And Information Sciences, (2008).
    Analysis of delay factors for voice over WiMAX
    (IEEE, 2008) Şafak, A.; Preveze, B.; 17573
    This paper presents the results of our computer simulation for delays experienced by voice packets over WiMAX 802.16e protocol running over an enterprise packet network connected to public internet. In the simulation we analyzed the effect of packet size, core network link speed, internet service provider link speed, wireless network link speed, wireless distance, base station range, and distance in internet parameters that effect the amount of delay in a WiMAX embedded IP network. In this study, all the delay parameters are fixed to their default values and current parameter values are changed so that the delay is varied between minimum and maximum values in uniformly distributed 100 steps and the delay is plotted in each step. Total fixed delays can be considered as minimum delay and variable delay corresponds to the maximum delay that can occur under the given conditions. All other fixed and variable delay parameters such as switching delays, packetization delays, contention delays and the delays caused by buffers etc. are also taken into account. The results indicate that among these delays WiMAX base station range and the number of base stations play the most decisive role.
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    Conference Object
    Citation Count: Preveze, Barbaros; Şafak, A. (2010). "Comparison of ant colony and fastest path algorithms for fixed and variable number of nodes in multi-hop networks", SIU 2010 - IEEE 18th Signal Processing and Communications Applications Conference,18th IEEE Signal Processing and Communications Applications Conference, SIU 201022 April 2010 through 24 April 2010, pp. 535-537.
    Comparison of ant colony and fastest path algorithms for fixed and variable number of nodes in multi-hop networks
    (2010) Preveze, Barbaros; Şafak, A.; 17573
    In this study, the fastest path algorithm which is known as a routing method from source to destination and Ant colony method which is known to be adaptable to the dynamic changes in the network are compared for average hop counts, power consumption and packet arrival delays by implementing a mobile network simulation. Even the average hop counts for both algorithms reach to almost same value at the simulation results, since it is seen that the fastest path algorithm provides less packet delay and less power consumption with respect to Ant colony algorithm , it is thought that fastest path algorithm may be more useful than Ant colony algorithm for real time voice or video packet transmissions. ©2010 IEEE.
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    Article
    Citation Count: Preveze, B., Şafak, A. (2012). Effects of routing algorithms on novel throughput improvement of mobile ad hoc networks. Turkish Journal Of Electrical Engineering And Computer Sciences, 20(4), 507-522. http://dx.doi.org/10.3906/elk-1008-723
    Effects of routing algorithms on novel throughput improvement of mobile ad hoc networks
    (TUBİTAK Scientific&Technical Research Council Turkey, 2012) Preveze, Barbaros; Şafak, Aysel; 17573
    A cognitive method called most congested access first (MCAF), minimizing the packet loss ratio and improving the throughput of a multihop mobile WiMAX network, is proposed. MCAF combines both the time division multiple access and the orthogonal frequency division multiple access methods. MCAF additionally uses spectral aid and buffer management methods, which air proposed in this paper, to manage both spectrum. access and packets in the buffers. By using these novel methods, real-time video and voice packet transmission is achieved, data packet loss rate is minimized, and the system throughput per node is improved. Effects of fastest path and ant colony routing algorithms on throughput improvement methods are investigated. It is shown that the fastest path routing algorithm, provides higher throughput values than the ant colony routing algorithm
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    Conference Object
    Citation Count: Preveze, Barbaros; Şafak, Aysel (2010). "Power consumption of novel throughput improvement methods", 2010 7th National Conference on Electrical, Electronics and Computer Engineering, ELECO 2010, 2 December 2010through 5 December 2010, pp. 676-679.
    Power consumption of novel throughput improvement methods
    (2010) Preveze, Barbaros; Şafak, Aysel; 17573
    The novel proposed method as a combination of Time Division Multiple Access (TDMA) and Orthogonal Frequency Division Multiple Access (OFDMA) called Orthogonal Frequency Division Most Congested Access First (OFDMCAF) provides spectrum sharing, buffer management and improves the throughput. In this work the power consumed by activating each cognitive method is analyzed in addition to the throughput improvement provided by each method used with OFDMCAF. It is shown at the end of the analysis that activation of each method also decreases the average power consumption even the same routing algorithm is used in all cases.
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    Book Part
    Citation Count: Preveze, Barbaros (2015). "Throughput Improvement in Mobile Ad Hoc Networks Using Cognitive Method", MULTIMEDIA OVER COGNITIVE RADIO NETWORKS: ALGORITHMS, PROTOCOLS, AND EXPERIMENTS, pp. 403-421.
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    Publication
    Citation Count: Preveze, Barbaros; Şafak, Aysel, "Throughput maximisation of different signal shapes working on 802.16e mobile multihop network using novel cognitive methods", Recent Trends In Wireless And Mobile Networks, Vol.84, (2010).
    Throughput maximisation of different signal shapes working on 802.16e mobile multihop network using novel cognitive methods
    (Springer-Verlag Berlin, 2010) Preveze, Barbaros; Şafak, Aysel; 17573
    This study proposes cognitive methods for managing the multimedia packet traffic of 802.16e system providing the dynamic spectrum sharing by TDM & OFDMA under heavy traffic conditions. The cognitive techniques are used in order to maximize the throughput of a system having different signal shapes such as video, voice or data packets. All real time voice and video packets transmissions have been provided with full success where the loss rate of data packets has been minimized using the cognitive methods. By these methods buffers are managed successfully for the given parameters, optimum buffer sizes have been formulized and it's shown that we brought the throughput up to its calculated theoretical limits for multi-hop mobile wimax (802.16e).