International Journal of Computer Networks and Communications Security

Volume 3, Issue 12, December 2015

 

 

 

Challenges for a Global Solution Addressing Quality of Service Problems in P2P IPTV Systems
Pages: 432-437 (6) | [Full Text] PDF (248 KB)
I Ullah, W Noor, MJI Khan, J Baber, A Ahmed
Department of Computer Science & IT, University of Balochistan, Quetta
Directorate of IT, SBK Women’s University, Quetta, Balochistan

Abstract - Currently, there are many peer-to-peer (P2P) application layer multicast (ALM) solutions which offer a serious alternative to IP multicast and content delivery networks live video streaming applications. Nonetheless these P2P infrastructures suffer from Quality of Service (QoS) problems due to several causes: dynamics of users’ presence, selfish behavior, latency, bandwidth and geographic distance. Several research works address these problems individually, but none of them provides a global solution. In this paper, we show how a solution based on a multi-agent system can solve this problem and the challenges it has to face.
 
Index Terms - P2P IPTV, Multi-Agent systems, Overlay Networks, Live Video Streaming, Quality of Service

Citation - I Ullah, W Noor, MJI Khan, J Baber, A Ahmed. "Challenges for a Global Solution Addressing Quality of Service Problems in P2P IPTV Systems." International Journal of Computer Networks and Communications Security 3, no. 12 (2015): 432-437.
 

SLM Technique with Hadamard Transform for PAPR Reduction
Pages: 438-441 (4) | [Full Text] PDF (291 KB)
MD Kwesi, J Wang, K Sultan
School of Computer and Communication Engineering, University of Science and Technology Beijing, Beijing, PR China.

Abstract - Peak-to-average power ratio (PAPR) is a major drawback for multicarrier system such as orthogonal frequency division multiplexing (OFDM). Due to increase in PAPR of OFDM signal the power amplifier causes non-linear distortion. In this paper we have proposed a PAPR reduction scheme for OFDM system by modification in conventional selective mapping (SLM) technique with Hadamard transform (HT). Furthermore, the Complementary Cumulative Distribution Function (CCDF) of the PAPR for both the conventional and the Modified SLM are measured and compared.
 
Index Terms - Hadamard Transform, Selective Mapping, Peak-to-Average-Power Ratio

Citation - MD Kwesi, J Wang, K Sultan. "SLM Technique with Hadamard Transform for PAPR Reduction." International Journal of Computer Networks and Communications Security 3, no. 12 (2015): 438-441.
 

Performance evaluation of Matched Filter Detection Based on Non-Cooperative Spectrum Sensing in Cognitive Radio Network
Pages: 442-446 (5) | [Full Text] PDF (366 KB)
PS YAWADA, JW AN
University of Science and Technology Beijing, Department of Communication Engineering, School of Computer and Communication Engineering, Beijing-China.

Abstract - The recent and rapid evolution of wireless technologies has led to a high demand in terms of resources. To solve this prob-lem the idea of cognitive radio has been introduced to facilitate a good spectrum management and efficient use of the spectrum. In this article, a method for the detection of the spectrum with the purpose of detecting the presence of bands of unoccupied frequencies is proposed. The method used is the matched filter. The performance was assessed by using the MATLAB based on the AWGN channel.
 
Index Terms - Performance, Cognitive Radio, Matched Filter Detection, Spectrum sensing, AWGN channel

Citation - PS YAWADA, JW AN. "Performance evaluation of Matched Filter Detection Based on Non-Cooperative Spectrum Sensing in Cognitive Radio Network." International Journal of Computer Networks and Communications Security 3, no. 12 (2015): 442-446.
 

Throughput Analysis of Single Gateway Association in Wireless Mesh Network with Multiple Gateways
Pages: 432-450 (4) | [Full Text] PDF (278 KB)
GJ TRIPATHI, AR MAHAJAN
Research Scholar, Department of CSE, GHRCE, Nagpur (MS), India
Professor & Head, Department of IT, Government Polytechnic, Nagpur (MS), India.

Abstract - Wireless mesh network (WMN) has become widely accepted technology in recent decade. Low cost, simplicity and availability of the Internet without actually getting directly connected to the broadband services, are few of the advantages that can be counted on for popularity of WMN. Mesh nodes get access to the Internet through a special device called Gateway. Even one gateway may be sufficient to provide broadband facility to a number of nodes in its range. With addition of more gateways, the range of covering more nodes is increased. This scenario of multiple gateways leads to improvement in throughput of overall network. But some criteria is required based on which the nodes are to be associated to a gateway. Associating to the nearest gateway may not be always the best choice. We present here an algorithm for associating a node to one of several available gateways. Throughput is one of the key performance metrics for many applications. In this paper we have analyzed the network on this performance metric for nearest gateway scheme and for proposed scheme. The proposed scheme has shown better performance especially for densely populated mesh nodes near gateway.
 
Index Terms - WMN, Gateway, Mesh Node, End to End Delay, Throughput

Citation - GJ TRIPATHI, AR MAHAJAN. "Throughput Analysis of Single Gateway Association in Wireless Mesh Network with Multiple Gateways." International Journal of Computer Networks and Communications Security 3, no. 12 (2015): 432-450.