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Journal of Communications and Networks

Issue 1 • Date Feb. 2011

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

    Publication Year: 2011, Page(s): c1
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  • [Inside front cover]

    Publication Year: 2011, Page(s): c2
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  • Word-based FCSRs with fast software implementations

    Publication Year: 2011, Page(s):1 - 5
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (530 KB) | HTML iconHTML

    Feedback with carry shift registers (FCSRs) over 2-adic number would be suitable in hardware implementation, but they are not efficient in software implementation since their basic unit (the size of register cells) is 1-bit. In order to improve the efficiency we consider FCSRs over 2 -adic number (i.e., FCSRs with register cells of size ℓ-bit) that produce ℓ bits a... View full abstract»

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  • Narrowband signal localization based on enhanced LAD method

    Publication Year: 2011, Page(s):6 - 11
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (661 KB) | HTML iconHTML

    In this paper, an enhanced localization algorithm based on double thresholds (LAD) is proposed for localizing narrow band signals in the frequency domain. A simplified LAD method is first studied to reduce the computational complexity of the original LAD method without performance loss. The upper and lower thresholds of the simplified LAD method are directly calculated by running the forward conse... View full abstract»

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  • Ternary codes from modified Jacket matrices

    Publication Year: 2011, Page(s):12 - 16
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (741 KB) | HTML iconHTML

    In this paper, we construct two families Cm* and C̃m* of ternary (2m, 3m, 2m-1) and (2m 3m+1, 2m-1) codes, for m = 1, 2, 3, ⋯, derived from the corresponding families of modified ternary Jacket matrices. These codes are close to the Plotkin bound and have a very easy decoding procedure. View full abstract»

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  • CREEC: Chain routing with even energy consumption

    Publication Year: 2011, Page(s):17 - 25
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1476 KB) | HTML iconHTML

    A convergecast is a popular routing scheme in wireless sensor networks (WSNs) in which every sensor node periodically forwards measured data along configured routing paths to a base station (BS). Prolonging lifetimes in energy-limited WSNs is an important issue because the lifetime of a WSN influences on its quality and price. Low-energy adaptive clustering hierarchy (LEACH) was the first attempt ... View full abstract»

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  • A novel optimization-based approach for minimum power multicast in wireless networks

    Publication Year: 2011, Page(s):26 - 31
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (803 KB) | HTML iconHTML

    In this paper, we formulate the minimum power multicast problem in wireless networks as a mixed integer linear programming problem and then propose a Lagrangean relaxation based algorithm to solve this problem. By leveraging on the information from the Lagrangean multiplier, we could construct more power efficient routing paths. Numerical results demonstrate that the pro- posed approach outperform... View full abstract»

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  • Enhanced throughput and QoS fairness for two-hop IEEE 802.16j relay networks

    Publication Year: 2011, Page(s):32 - 42
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3221 KB) | HTML iconHTML

    Frequency reuse among relay stations (RSs) in a down- link access zone is widely adopted for throughput enhancement in IEEE 802.16j relay networks. Since the areas covered by the RSs or the base station (BS) may overlap, some mobile stations (MSs) at the border between two neighboring transmitting stations (RS or BS) using an identical frequency band may suffer severe interference or outage. This ... View full abstract»

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  • Analysis of three-phase multiple access with continual contention resolution (TPMA-CCR) for wireless multi-hop ad hoc networks

    Publication Year: 2011, Page(s):43 - 49
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (788 KB) | HTML iconHTML

    In this paper, a new medium access control (MAC) protocol entitled three-phase multiple access with continual contention resolution (TPMA-CCR) is proposed for wireless multi-hop ad hoc networks. This work is motivated by the previously known threephase multiple access (TPMA) scheme of Hou and Tsai [2] which is the suitable MAC protocol for clustering multi-hop ad hoc net- works owing to its benefi... View full abstract»

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  • Opportunistic relaying based spectrum leasing for cognitive radio networks

    Publication Year: 2011, Page(s):50 - 55
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (711 KB) | HTML iconHTML

    Spectrum leasing for cognitive radio (CR) networks is an effective way to improve the spectrum utilization. This paper presents an opportunistic relaying based spectrum leasing for CR networks where the primary users lease their frequency band to the cognitive users. The cognitive users act as relays for the primary users to improve the channel capacity, and this improved capacity is used for the ... View full abstract»

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  • On the performance of the block-based selective OFDM decode-and-forward relaying scheme for 4G mobile communication systems

    Publication Year: 2011, Page(s):56 - 62
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1047 KB) | HTML iconHTML

    In this paper, we propose a block-based selective orthogonal frequency division multiplexing (OFDM) decode-and-forward relaying scheme for 4G mobile communication systems. In the scheme, an OFDM symbol is divided into blocks and one relay is selected for each block. Theoretical outage performance and error performance are analyzed and evaluated. A unified outage expression is given for our scheme ... View full abstract»

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  • Fixed-complexity sphere encoder for multi-user MIMO systems

    Publication Year: 2011, Page(s):63 - 69
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (805 KB) | HTML iconHTML

    In this paper, we propose a fixed-complexity sphere encoder (FSE) for multi-user multi-input multi-output (MU-MIMO) systems. The proposed FSE accomplishes a scalable tradeoff between performance and complexity. Also, because it has a parallel tree-search structure, the proposed encoder can be easily pipelined, leading to a tremendous reduction in the preceding latency. The complexity of the propos... View full abstract»

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  • The unified UE baseband modem hardware platform architecture for 3GPP specifications

    Publication Year: 2011, Page(s):70 - 76
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1896 KB) | HTML iconHTML

    This paper presents the unified user equipment (UE) baseband modulation and demodulation (modem) hardware platform architecture to support multiple radio access technologies. In particular, this platform selectively supports two systems; one is HEDGE system, which is the combination of third generation partnership project (3GPP) Release 7 high speed packet access evolution (HSPA+) and global syste... View full abstract»

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  • Call for papers

    Publication Year: 2011, Page(s): 1
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  • Call for papers

    Publication Year: 2011, Page(s): 1
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  • Call for papers

    Publication Year: 2011, Page(s): 1
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  • [Advertisement]

    Publication Year: 2011, Page(s): 1
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  • [Back inside cover]

    Publication Year: 2011, Page(s): c3
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  • [Back cover]

    Publication Year: 2011, 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