By Topic

Journal of Communications and Networks

Issue 1 • Date March 2007

Filter Results

Displaying Results 1 - 20 of 20
  • [Front cover]

    Publication Year: 2007, Page(s): c1
    Request permission for commercial reuse | PDF file iconPDF (58 KB)
    Freely Available from IEEE
  • [Front inside cover]

    Publication Year: 2007, Page(s): c2
    Request permission for commercial reuse | PDF file iconPDF (59 KB)
    Freely Available from IEEE
  • Subsidiary maximum likelihood iterative decoding based on extrinsic information

    Publication Year: 2007, Page(s):1 - 10
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1234 KB) | HTML iconHTML

    This paper proposes a multimodal generalized Gaussian distribution (MGGD) to effectively model the varying statistical properties of the extrinsic information. A subsidiary maximum likelihood decoding (MLD) algorithm is subsequently developed to dynamically select the most suitable MGGD parameters to be used in the component maximum a posteriori (MAP) decoders at each decoding iteration to derive ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Comprehensive analysis of turbo TCM over two typical channels

    Publication Year: 2007, Page(s):11 - 17
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1183 KB) | HTML iconHTML

    In this paper, system performance of turbo trellis coded modulation (turbo TCM) is presented and analyzed through computer simulations over two typical channels, namely additive white Gaussian noise (AWGN) and Rayleigh fading channels. We use and compare different mapping strategies based on Ungerboeck partitioning (UP), block partitioning (BP), mixed partitioning (MP), Gray partitioning (GP), and... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A square root normalized LMS algorithm for adaptive identification with non-stationary inputs

    Publication Year: 2007, Page(s):18 - 27
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2945 KB) | HTML iconHTML

    The conventional normalized least mean square (NLMS) algorithm is the most widely used for adaptive identification within a non-stationary input context. The convergence of the NLMS algorithm is independent of environmental changes. However, its steady state performance is impaired during input sequences with low dynamics. In this paper, we propose a new NLMS algorithm which is, in the steady stat... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Intersymbol decorrelating detector for asynchronous CDMA systems

    Publication Year: 2007, Page(s):28 - 33
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (670 KB) | HTML iconHTML

    Estimated channel information, especially multipath length and multipath channel of the desired user, is necessary for most previously reported linear blind multiuser detectors in code division multiple access (CDMA) systems. This paper presents a new blind intersymbol decorrelating detector in asynchronous CDMA systems, which uses the cross correlation matrix of the consecutive symbols. The propo... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • BER performance of OFDM combined with TDM using frequency-domain equalization

    Publication Year: 2007, Page(s):34 - 42
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1341 KB) | HTML iconHTML

    Orthogonal frequency division multiplexing (OFDM) combined with time division multiplexing (TDM), in this paper called OFDM/TDM, can overcome the high peak-to-average-power ratio (PAPR) problem of the conventional OFDM and improve the robustness against long time delays. In this paper, the bit error rate (BER) performance of OFDM/TDM in a frequency-selective Rayleigh fading channel is evaluated by... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Enhanced client polling with multilevel pre-fetching algorithm for wireless networks

    Publication Year: 2007, Page(s):43 - 49
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1096 KB) | HTML iconHTML

    The implementation of client polling as a weak cache coherence mechanism has two major drawbacks: Firstly, the cache may return a stale copy if the object is changed in the origin server while the cached copy is considered valid. Secondly, the cache can invalidate a cached copy that is still valid in the server. Therefore, we propose a multilevel pre-fetching (MLP) in conjunction with the client p... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Chip-interleaved self-encoded multiple access with iterative detection in fading channels

    Publication Year: 2007, Page(s):50 - 55
    Cited by:  Papers (20)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1014 KB) | HTML iconHTML

    We propose to apply chip interleaving and iterative detection to self-encoded multiple access (SEMA) communications. In SEMA, the spreading code is obtained from user bit information itself without using a pseudo noise code generator. The proposed scheme exploits the inherent diversity in self encoded spread spectrum signals. Chip interleaving not only increases the diversity gain, but also enhanc... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A scalable and robust approach to collaboration enforcement in mobile ad-hoc networks

    Publication Year: 2007, Page(s):56 - 66
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (997 KB) | HTML iconHTML

    Mobile ad-hoc networks (MANETs) have attracted great research interest in recent years. Among many issues, lack of motivation for participating nodes to collaborate forms a major obstacle to the adoption of MANETs. Many contemporary collaboration enforcement techniques employ reputation mechanisms for nodes to avoid and penalize malicious participants. Reputation in- formation is propagated among ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Dual diversity over correlated Ricean fading channels

    Publication Year: 2007, Page(s):67 - 74
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (982 KB) | HTML iconHTML

    The performance of dual diversity receivers operating over correlated Ricean fading channels is analyzed. Using a previously derived rapidly converging infinite series representation for the bivariate Ricean probability density function, analytical expressions for the statistics of dual-branch selection combining, maximal-ratio combining, and equal-gain combining output signal-to-noise ratio (SNR)... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Reduced complexity signal detection for OFDM systems with transmit diversity

    Publication Year: 2007, Page(s):75 - 83
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (987 KB) | HTML iconHTML

    Orthogonal frequency division multiplexing (OFDM) systems with multiple transmit antennas can exploit space-time block coding on each subchannel for reliable data transmission. Spacetime coded OFDM systems, however, are very sensitive to time variant channels because the channels need to be static over multiple OFDM symbol periods. In this paper, we propose to mitigate the channel variations in th... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Steiner tree compilation of multicast under differentiated services constraints

    Publication Year: 2007, Page(s):84 - 92
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1236 KB) | HTML iconHTML

    This paper deals with the creation of multicast trees in a differentiated services (DiffServ) domain. Initially, we model the integration problems of multicast & DiffServ and give a general description of our framework for multicast provisioning in DiffServ domains. Within this framework, we introduce a novel heuristic algorithm which calculates the multicast trees efficiently. The multicast t... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Survivable traffic grooming in WDM ring networks

    Publication Year: 2007, Page(s):93 - 104
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (895 KB) | HTML iconHTML

    Traffic grooming, in which low-rate circuits are multiplexed onto wavelengths, with the goal of minimizing the number of add-drop multiplexers (ADMs) and wavelengths has received much research attention from the optical networking community in recent years. While previous work has considered various traffic models and network architectures, protection requirements of the circuits have not been con... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Call for papers

    Publication Year: 2007, Page(s): 1
    Request permission for commercial reuse | PDF file iconPDF (67 KB)
    Freely Available from IEEE
  • Call for papers

    Publication Year: 2007, Page(s): 1
    Request permission for commercial reuse | PDF file iconPDF (50 KB)
    Freely Available from IEEE
  • IEEE copyright transfer form

    Publication Year: 2007, Page(s): 1
    Request permission for commercial reuse | PDF file iconPDF (32 KB)
    Freely Available from IEEE
  • [Advertisement]

    Publication Year: 2007, Page(s): 1
    Request permission for commercial reuse | PDF file iconPDF (49 KB)
    Freely Available from IEEE
  • Journal of Communications and Networks (JCN)

    Publication Year: 2007, Page(s): c3
    Request permission for commercial reuse | PDF file iconPDF (39 KB)
    Freely Available from IEEE
  • [Back cover]

    Publication Year: 2007, Page(s): c4
    Request permission for commercial reuse | PDF file iconPDF (51 KB)
    Freely Available from IEEE

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