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Journal of Communications and Networks

Issue 1 • Date Feb. 2009

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Displaying Results 1 - 19 of 19
  • [Front cover]

    Publication Year: 2009, Page(s): c1
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  • [Front inside cover]

    Publication Year: 2009, Page(s): c2
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  • Mitigation techniques of channel collisions in the TTFR-based asynchronous spectral phase-encoded optical CDMA system

    Publication Year: 2009, Page(s):1 - 10
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1757 KB) | HTML iconHTML

    In this paper, we propose a chip-level detection and a spectral-slice scheme for the tunable-transmitter/fixed-receiver (TTFR)-based asynchronous spectral phase-encoded optical code-division multiple-access (CDMA) system combined with time-encoding. The chip-level detection can enhance the tolerance of multiple access interference (MAI) because the channel collision does not occur as long as there... View full abstract»

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  • Performance analysis of multicarrier code select CDMA system for PAPR reduction in multipath channels

    Publication Year: 2009, Page(s):11 - 19
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1370 KB) | HTML iconHTML

    Multicarrier direct sequence code division multiple access (MC DS-CDMA) is an attractive technique for achieving high data rate transmission. This is valid regardless of whether or not the potentially large peak-to-average power ratio (PAPR) is an important factor for its application. On the other hand, code select CDMA (CS-CDMA) is an attractive technique with constant amplitude transmission of m... View full abstract»

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  • Implementation-friendly QRM-MLD using trellis-structure based on Viterbi algorithm

    Publication Year: 2009, Page(s):20 - 25
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (921 KB) | HTML iconHTML

    The maximum likelihood detection with QR decomposition and M-algorithm (QRM-MLD) has been presented as a suboptimum multiple-input multiple-output (MIMO) detection scheme which can provide almost the same performance as the optimum maximum likelihood (ML) MIMO detection scheme but with the reduced complexity. However, due to the lack of parallelism and the regularity in the decoding structure, the... View full abstract»

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  • A minimum data-rate guaranteed resource allocation with low signaling overhead in multi-cell OFDMA systems

    Publication Year: 2009, Page(s):26 - 35
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (733 KB) | HTML iconHTML

    In this paper, we investigate how to do resource allocation to guarantee a minimum user data rate at low signaling overhead in multi-cell orthogonal frequency division multiple access (OFDMA) wireless systems. We devise dynamic resource allocation (DRA) algorithms that can minimize the QoS violation ratio (i.e., the ratio of the number of users who fail to get the requested data rate to the total ... View full abstract»

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  • QoS packet-scheduling scheme for VoIP services in IEEE 802.16e systems

    Publication Year: 2009, Page(s):36 - 41
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (817 KB) | HTML iconHTML

    The IEEE 802.16 wireless metropolitan area network (WMAN) standard is designed to correct expensive communication costs in CDMA-based mobile communication systems and limited coverage problems in wireless LAN systems. Thus, the IEEE 802.16e standard can provide mobile high-speed packet access between mobile stations and the Internet service provider through the base station with cheap communicatio... View full abstract»

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  • Optimum superimposed training for mobile OFDM systems

    Publication Year: 2009, Page(s):42 - 46
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (814 KB) | HTML iconHTML

    Superimposed training (SIT) design for estimating of time-varying multipath channels is investigated for mobile orthogonal frequency division multiplexing (OFDM) systems. The design of optimum SIT consists of two parts: The optimal SIT sequence is derived by minimizing the channel estimates' mean square error (MSE); the optimal power allocation between training and information data is developed by... View full abstract»

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  • A study of connectivity in MIMO fading ad-hoc networks

    Publication Year: 2009, Page(s):47 - 56
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (970 KB) | HTML iconHTML

    We investigate the connectivity of fading wireless ad-hoc networks with a pair of novel connectivity metrics. Our first metric looks at the problem of connectivity relying on the outage capacity of MIMO channels. Our second metric relies on a probabilistic treatment of the symbol error rates for such channels. We relate both capacity and symbol error rates to the characteristics of the underlying ... View full abstract»

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  • Self organization of sensor networks for energy-efficient border coverage

    Publication Year: 2009, Page(s):57 - 71
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2916 KB) | HTML iconHTML

    Networking together hundreds or thousands of cheap sensor nodes allows users to accurately monitor a remote environment by intelligently combining the data from the individual nodes. As sensor nodes are typically battery operated, it is important to efficiently use the limited energy of the nodes to extend the lifetime of the wireless sensor network (WSN). One of the fundamental issues in WSNs is ... View full abstract»

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  • Effect of head of the line blocking on session initiation protocol session establishment delays

    Publication Year: 2009, Page(s):72 - 83
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2322 KB) | HTML iconHTML

    We have studied the effect of head of the line blocking (HOLB) on session initiation protocol (SIP) session establishment delays. Our results are based on experiments performed in a test bed and on the public Internet. We used the stream control transmission protocol (SCTP) as a transport for SIP because SCTP can be configured to suffer or to avoid HOLB. Our experiments show that the effect of HOL... View full abstract»

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  • Analysis of link error effects in MANET address autoconfiguration protocols

    Publication Year: 2009, Page(s):84 - 93
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (750 KB) | HTML iconHTML

    This paper focuses on message complexity performance analysis of mobile ad hoc network (MANET) address autoconfiguration protocols (AAPs) in reference to link errors generated by mobile wireless nodes. An enhancement was made using a proposed retransmission limit, S, to be computed for error recovery (based on the link error probability), to measure message complexity of AAPs in reference to the l... View full abstract»

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  • Call for papers

    Publication Year: 2009, Page(s): 1
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  • Call for papers

    Publication Year: 2009, Page(s): 1
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  • Call for papers

    Publication Year: 2009, Page(s): 1
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  • [Advertisement]

    Publication Year: 2009, Page(s): 1
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  • Copyright transfer form

    Publication Year: 2009, Page(s): 1
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  • Journal of Communications and Networks (JCN)

    Publication Year: 2009, Page(s): c3
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  • [Back cover]

    Publication Year: 2009, Page(s): c4
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Aims & Scope

The Journal of Communications and Networks is published six times per year, and is committed to publishing high-quality papers that advance the state-of-the-art and practical applications of communications and information networks.

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
Anthony Ephremides
University of Maryland