Journal of Communication Engineering & Systems
Volume 2, Issue 2 (2012)
Published
Table of contents
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A New Effective MUSIC Algorithm for Direction of Arrival Estimation and Combining It with Beam Forming in Smart Antenna Systems
Abstract: ABSTRACT Smart antenna is now commonly used in communication systems due to its high advantages. Two important functions in smart antenna are direction of arrival estimation and beam forming. The main aim of direction of arrival estimation in smart antenna is to estimate the direction of the signal and based on this angle the beam forming will identify the exact position and phase angle of the antenna. Here we proposed …
Published in Journal of Communication Engineering & Systems · Vol. 2, Issue 2, 2012 · pp. 1–6 Read article
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Handoff Call Queuing in Distributed Dynamic Channel Allocation Strategy
Abstract: ABSTRACT It is important to utilize the channels very efficiently in cellular system as these channels are meager. In this paper, A Distributed Dynamic Channel Allocation (DDCA) strategy is applied for channel allocation in 9-cell system having non-uniform traffic. Square shape cells with nine cell cluster size have been considered for model development with GSM 1800 specification. The model also considers fixed channel reservation (5–15% of total channel per cell) …
Published in Journal of Communication Engineering & Systems · Vol. 2, Issue 2, 2012 · pp. 14–25 Read article
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Performance Analysis of 802.11 MAC Protocol of Wireless Networks under Misbehaving Condition
Abstract: ABSTRACT In this paper the performance of Mac Layer is seen when the number of nodes which are misbehaving increases in the wireless networks. Mobile ad hoc networks depends on the network nodes cooperation in forwarding packets due to the lack of centralized authority. A network node may incline not to cooperate with other nodes in order to save its resources due to selfishness. Here qualnet 5.2 is used for …
Published in Journal of Communication Engineering & Systems · Vol. 2, Issue 2, 2012 · pp. 26–32 Read article
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Review of Adaptive Modulation Recognition Techniques
Abstract: ABSTRACT Rising development in software defined radio (SDR) systems has led to rapid development in adaptive modulation recognition (AMR) techniques. Different order modulations combined with different coding schemes allow sending more bits per symbol, thus achieving higher throughputs and better spectral efficiencies by the use of AMR. The aim of this paper is to study various AMR techniques and compare their advantages and disadvantages to find the most efficient and …
Published in Journal of Communication Engineering & Systems · Vol. 2, Issue 2, 2012 · pp. 33–42 Read article
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Dual Band Suspended Microstrip Right-angled Isosceles Triangular Patch Antenna
Abstract: ABSTRACT In this paper a dualband suspended microstrip right-angled isosceles triangular patch antenna is designed for use in microwave imaging system for breast cancer tumour detection. An approximate design equations are developed and validated by CST Microwave Studio’s simulated result. Here dual band operation is achieved by manipulating fundamental mode and higher mode of microstrip antenna. Tuning of this antenna is achieved at frequency 3.35 GHz and 6.70 GHz which …
Published in Journal of Communication Engineering & Systems · Vol. 2, Issue 2, 2012 · pp. 7–13 Read article