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Journal of Communications and Networks

Issue 2 • Date June 2008

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Displaying Results 1 - 22 of 22
  • Front cover

    Publication Year: 2008, Page(s): c1
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  • Inside front cover

    Publication Year: 2008, Page(s): c2
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  • Wireless cooperative transmission

    Publication Year: 2008, Page(s):113 - 117
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (70 KB) | HTML iconHTML

    Wireless cooperative transmission is a fast emerging technical field, in which significant progress has been made since the inception of the fundamental works [1], [2] to unveil the advantages of the cooperative transmit diversity. Cooperative transmission provides several unique capabilities such as the macro-diversity, inference coordination-and-mitigation, minimum energy networking, and simple ... View full abstract»

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  • Inter-sector beamforming with MMSE receiver in the downlink of TDD cellular systems

    Publication Year: 2008, Page(s):118 - 126
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (934 KB) | HTML iconHTML

    The use of beamforming is effective for users in limited power environments. However, when it is applied to the downlink of a cellular system with universal frequency reuse, users near the sector boundary may experience significant interference from more than one sector. The use of a minimum mean square error (MMSE)-type receiver may not sufficiently cancel out the interference unless a sufficient... View full abstract»

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  • Cooperative interference mitigation using fractional frequency reuse and intercell spatial demultiplexing

    Publication Year: 2008, Page(s):127 - 136
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1613 KB) | HTML iconHTML

    For mobile wireless systems with full frequency reuse, co-channel interference near the cell coverage boundaries has a significant impact on the signal reception performance. This paper addresses an approach to efficiently mitigate the effect of downlink co-channel interference when multi-antenna terminals are used in cellular environments, by proposing a signal detection strategy combined with a ... View full abstract»

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  • Traffic asymmetry balancing in OFDMA-TDD cellular networks

    Publication Year: 2008, Page(s):137 - 147
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2129 KB) | HTML iconHTML

    This paper proposes a novel approach to interference avoidance via intercell relaying in cellular OFDMA-TDD (orthogonal frequency division multiple access — time division duplex) systems. The proposed scheme, termed asymmetry balancing, is targeted towards next-generation cellular wireless systems which are envisaged to have ad hoc and multi-hop capabilities. Asymmetry balancing resolves th... View full abstract»

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  • A technique to exploit cooperation for packet retransmission in wireless ad hoc networks

    Publication Year: 2008, Page(s):148 - 155
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (986 KB) | HTML iconHTML

    In wireless data communication systems, retransmission of an erroneous packet is inevitable due to the harsh communication environment. In this paper, an efficient retransmission scheme using cooperation from neighboring nodes is investigated. In the cooperative retransmission scheme, an erroneous packet is transmitted to the destination by cooperative nodes which have favorable channels. This coo... View full abstract»

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  • Power allocation for OFDM-based cooperative relay systems

    Publication Year: 2008, Page(s):156 - 162
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (867 KB) | HTML iconHTML

    Cooperative relays can provide spatial diversity and improve performance of wireless communications. In this paper, we study subcarrier power allocation at the relays for orthogonal frequency division multiplexing (OFDM)-based wireless systems. For cooperative relay with amplify-and-forward(AF) and decode-and-forward (DF) algorithms, we investigate the impact of power allocation to the mutual info... View full abstract»

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  • Performance of distributed MISO systems using cooperative transmission with antenna selection

    Publication Year: 2008, Page(s):163 - 174
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1439 KB) | HTML iconHTML

    Performance of downlink transmission strategies exploiting cooperative transmit diversity is investigated for distributed multiple-input single-output (MISO) systems, for which geographically distributed remote antennas (RA) in a cell can either communicate with distinct mobile stations (MS) or cooperate for a common MS. Statistical characteristics in terms of the signal-to-interference-plus-noise... View full abstract»

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  • Effect of cooperative and selection relaying schemes on multiuser diversity in downlink cellular systems with relays

    Publication Year: 2008, Page(s):175 - 185
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1197 KB) | HTML iconHTML

    In this paper, we investigate the effect of cooperative and selection relaying schemes on multiuser diversity in downlink cellular systems with fixed relay stations (RSs). Each mobile station (MS) is either directly connected to a base station (BS) and/or connected to a relay station. We first derive closed-form solutions or upper-bound of the ergodic and outage capacities of four different downli... View full abstract»

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  • A comparison of TDMA, dirty paper coding, and beamforming for multiuser MIMO relay networks

    Publication Year: 2008, Page(s):186 - 193
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (976 KB) | HTML iconHTML

    A two-hop multiple-input multiple-output (MIMO) relay network which comprises a multiple antenna source, an amplify-and-forward MIMO relay and many potential users are studied in this paper. Consider the achievable sum rate as the performance metric, a joint design method for the processing units of the BS and relay node is proposed. The optimal structures are given, which decompose the multiuser ... View full abstract»

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  • Rate bounds for MIMO relay channels

    Publication Year: 2008, Page(s):194 - 203
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (793 KB) | HTML iconHTML

    This paper considers the multi-input multi-output (MIMO) relay channel where multiple antennas are employed by each terminal. Compared to single-input single-output (SISO) relay channels, MIMO relay channels introduce additional degrees of freedom, making the design and analysis of optimal cooperative strategies more complex. In this paper, a partial cooperation strategy that combines transmit-sid... View full abstract»

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  • Minimum energy cooperative path routing in all-wireless networks: NP-completeness and heuristic algorithms

    Publication Year: 2008, Page(s):204 - 212
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (832 KB) | HTML iconHTML

    We study the routing problem in all-wireless networks based on cooperative transmissions. We model the minimum-energy cooperative path (MECP) problem and prove that this problem is NP-complete. We hence design an approximation algorithm called cooperative shortest path (CSP) algorithm that uses Dijkstra's algorithm as the basic building block and utilizes cooperative transmissions in the relaxatio... View full abstract»

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  • A simple cooperative transmission protocol for energy-efficient broadcasting over multi-hop wireless networks

    Publication Year: 2008, Page(s):213 - 220
    Cited by:  Papers (22)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (820 KB) | HTML iconHTML

    This paper analyzes a broadcasting technique for wireless multi-hop sensor networks that uses a form of cooperative diversity called opportunistic large arrays (OLAs). We propose a method for autonomous scheduling of the nodes, which limits the nodes that relay and saves as much as 32% of the transmit energy compared to other broadcast approaches, without requiring global positioning system (GPS),... View full abstract»

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  • Zone-based self-organized clustering with Byzantine agreement in MANET

    Publication Year: 2008, Page(s):221 - 227
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1032 KB) | HTML iconHTML

    The proposed zone-based self-organized clustering broadcasts neighbor information to only a zone with the same ID. Besides, the zone-based self-organized clustering with unique IDs can communicate securely even if the state transition of nodes in zone-based self-organized clustering is threatened by corrupted nodes. For this security, the Byzantine agreement protocol with proactive asynchronous ve... View full abstract»

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  • Call for papers

    Publication Year: 2008, Page(s): 1
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  • Call for papers

    Publication Year: 2008, Page(s): 1
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  • Call for papers

    Publication Year: 2008, Page(s): 1
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  • Call for papers

    Publication Year: 2008, Page(s): 1
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  • [Advertisement]

    Publication Year: 2008, Page(s): 1
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  • Journal of Communications and Networks (JCN)

    Publication Year: 2008, Page(s): c3
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  • Back cover

    Publication Year: 2008, 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