Journal of Communications and Networks

Issue 2 • June 2007

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

    Publication Year: 2007, Page(s): c1
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  • [Front inside cover]

    Publication Year: 2007, Page(s): c2
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  • MIMO-OFDM and its application

    Publication Year: 2007, Page(s):109 - 111
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (277 KB) | HTML iconHTML

    In the last decade, we have witnessed revitalization of multi-carrier techniques, and in particular orthogonal frequency division multiplexing (OFDM) for wireless applications. For wireless applications, an OFDM air-interface is of interest, because it can turn a wideband frequency selective channel into narrowband frequency flat channels. This makes the receiver design particularly easy since it ... View full abstract»

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  • Margin adaptive optimization in multi-user MISO-OFDM systems under rate constraint

    Publication Year: 2007, Page(s):112 - 117
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (605 KB) | HTML iconHTML

    In this paper, we focus on the total transmission power minimization problem for downlink beamforming multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems while ensuring each user's QoS requirement. Although the linear integer programming (LIP) solution we formulate provides the performance upper bound of the margin adaptive (MA) optimization problem, it ... View full abstract»

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  • Link adaptation and selection method for OFDM based wireless relay networks

    Publication Year: 2007, Page(s):118 - 127
    Cited by:  Papers (17)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1144 KB) | HTML iconHTML

    We propose a link adaptation and selection method for the links constituting an orthogonal frequency division multiplexing (OFDM) based wireless relay network. The proposed link adaptation and selection method selects the forwarding, modulation, and channel coding schemes providing the highest end-to- end throughput and decides whether to use the relay or not. The link adaptation and selection is ... View full abstract»

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  • Combined opportunistic beamforming methodology

    Publication Year: 2007, Page(s):128 - 135
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (748 KB) | HTML iconHTML

    A combined opportunistic multiple beamforming method is presented that the first beam is designed with an aid of channel state information using uplink mid-amble and other beams are orthogonally generated to the first beam sequentially. The power allocation with SINR feedback increases overall throughput for the de- centralized systems. The advantages of the proposed scheme is that the first beam ... View full abstract»

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  • Optimal bit allocation adaptive modulation algorithm for MIMO system

    Publication Year: 2007, Page(s):136 - 140
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (742 KB) | HTML iconHTML

    In this paper, an adaptive minimum transmit power modulation scheme under constant data rate and fixed bit error rate (BER) for the multiple-input multiple-output (MIMO) system is proposed. It adjusts the modulation order and allocates the transmit power to each spatial sub-channel when meeting the user's requirements at the cost of minimum transmission power. Compared to the other algorithm, it c... View full abstract»

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  • MIMO precoding in 802.16e WiMAX

    Publication Year: 2007, Page(s):141 - 149
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1130 KB) | HTML iconHTML

    Multiple-input multiple-output (MIMO) transmit precoding/beamforming can significantly improve system spectral efficiency. However, several obstacles prevent preceding from wide deployment in early wireless networks: The significant feedback overhead, performance degradation due to feedback delay, and the large storage requirement at the mobile devices. In this paper, we propose a preceding method... View full abstract»

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  • Theory and design of near-optimal MIMO OFDM transmission system for correlated multipath Rayleigh fading channels

    Publication Year: 2007, Page(s):150 - 158
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (674 KB) | HTML iconHTML

    We consider channel-coded multi-input multi-output (MIMO) orthogonal frequency-division multiplexing (OFDM) transmission and obtain a condition on its signal for it to attain the maximum diversity and coding gain. As this condition may not be realizable, we propose a suboptimal design that employs an orthogonal transform and a space-frequency interleaver between the channel coder and the multi-ant... View full abstract»

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  • Interference mitigation technique for the sharing between IMT-advanced and fixed satellite service

    Publication Year: 2007, Page(s):159 - 166
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (987 KB) | HTML iconHTML

    In this paper, we propose an efficient and robust interference mitigation technique based on a nullsteering multi-user multiple-input multiple-output (MU-MIMO) spatial division multiple access (SDMA) scheme for frequency sharing between IMT-advanced and fixed satellite service (FSS) in the 3400-4200 and 4500-4800 MHz bands. In the proposed scheme, the pre-existing preceding matrix for SDMA unitary... View full abstract»

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  • Design of unequal error protection for MIMO-OFDM systems with hierarchical signal constellations

    Publication Year: 2007, Page(s):167 - 176
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1176 KB) | HTML iconHTML

    In multimedia communication systems, efficient trans- mission system design should incorporate the use of matching unequal error protection (UEP), since source coders exhibit unequal bit error sensitivity. In this paper, we present UEP schemes which exploit differences in bit error protection levels in orthogonal frequency division multiplexing (OFDM) systems over frequency selective fading channe... View full abstract»

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  • Exact error and outage probability formulas for Alamouti space time code 2 × J

    Publication Year: 2007, Page(s):177 - 184
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1180 KB) | HTML iconHTML

    Alamouti space-time code (STC) is a part of the UMTS-WCDMA standard. However, up to the best of our knowledge no exact closed-form outage and bit error probability (BEP) formulas for this famous code exists. Evaluating its performance through simulations is time-consuming and therefore, there should be analytical performance graphs to serve as a reference which are derived in this paper for cohere... View full abstract»

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  • Robust multiuser detection based on least p-norm state space filtering model

    Publication Year: 2007, Page(s):185 - 191
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (787 KB) | HTML iconHTML

    Alpha stable distribution is better for modeling impulsive noises than Gaussian distribution in signal processing. This class of process has no closed form of probability density function and finite second order moments. In general, Wiener filter theory is not meaningful in SaSG environments because the expectations may be unbounded. We proposed a new adaptive recursive least p-norm Kalman filteri... View full abstract»

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  • Performance analysis of synchronous downlink MC-CDMA with precoding and frequency offset

    Publication Year: 2007, Page(s):192 - 197
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (792 KB) | HTML iconHTML

    We analyze the performance of code division multiple access (CDMA) system with multicarrier (MC) that employs precoding in synchronous downlink channels. Even though considerable efforts are undergoing for frequency offset estimation and correction, it is inevitable for the system to bear the remaining frequency offset. Therefore it is important to predict accurately the system performance in the ... View full abstract»

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  • Dynamic survivable routing for shared segment protection

    Publication Year: 2007, Page(s):198 - 209
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1803 KB) | HTML iconHTML

    This paper provides a thorough study on shared segment protection (SSP) for mesh communication networks in the complete routing information scenario, where the integer linear program (ILP) in [1] is extended such that the following two constraints are well addressed: (a) The restoration time constraint for each connection request, and (b) the switching/merging capacity constraint at each node. A n... View full abstract»

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  • Call for papers

    Publication Year: 2007, Page(s): 1
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  • Call for papers

    Publication Year: 2007, Page(s): 1
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  • Call for papers

    Publication Year: 2007, Page(s): 1
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  • [Back cover]

    Publication Year: 2007, 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