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Communications Letters, IEEE

Issue 12 • Date Dec. 2004

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Displaying Results 1 - 15 of 15
  • Table of contents

    Publication Year: 2004 , Page(s): c1
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  • IEEE Communications Letters publication information

    Publication Year: 2004 , Page(s): c2
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  • Unified framework for linear MIMO transceivers with shaping constraints

    Publication Year: 2004 , Page(s): 697 - 699
    Cited by:  Papers (17)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (136 KB) |  | HTML iconHTML  

    This letter considers optimum linear transceivers for MIMO channels under a general framework based on Schur-concave and Schur-convex cost functions, subject to shaping constraints on the transmit covariance matrix. Such constraints may be useful, for example, to impose spectral masks in cable systems, to control the power transmitted along certain directions in wireless systems, or to limit the d... View full abstract»

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  • Extended orthogonal polyphase codes for multicarrier CDMA system

    Publication Year: 2004 , Page(s): 700 - 702
    Cited by:  Papers (10)  |  Patents (5)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (216 KB) |  | HTML iconHTML  

    The Complete Complementary (CC) codes have been able to improve the performance of multicarrier CDMA system for both downlink and uplink transmission. However, the number of users supported by CC code design is limited as its family size is relatively small. In this letter, an extension to CC codes using Zadoff-Chu sequence is proposed. The proposed codes are able to support large number of users ... View full abstract»

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  • Adaptive traffic prediction based access control in wireless CDMA systems supporting integrated voice/data/video services

    Publication Year: 2004 , Page(s): 703 - 705
    Cited by:  Papers (9)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (168 KB) |  | HTML iconHTML  

    An access control protocol is proposed for integrated voice/data/video code-division multiple-access (CDMA) systems. The protocol involves predicting the residual capacity available for non-real-time data services in reverse link (mobile to base station). Two estimation schemes, a static estimation scheme and a dynamic estimation scheme, are proposed for predicting the residual capacity, the numbe... View full abstract»

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  • Call blocking probability for heterogeneous and asymmetrical traffics in a TD-CDMA system

    Publication Year: 2004 , Page(s): 706 - 708
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (216 KB) |  | HTML iconHTML  

    We develop a mathematical model to analyze call-level performance of radio channel allocation of TD-CDMA systems supporting multitype heterogeneous and asymmetrical traffic. The mathematical model has multidimensional operations using random vectors or matrices to deal with multiple types of traffic and asymmetrical up-and-down transmission directions separately. Employing the mathematical model, ... View full abstract»

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  • Highly accurate simple closed-form approximations to lognormal sum distributions and densities

    Publication Year: 2004 , Page(s): 709 - 711
    Cited by:  Papers (47)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (240 KB) |  | HTML iconHTML  

    Sums of lognormal random variables occur extensively in wireless communications, in part, because a shadowing environment is well modeled by a lognormal distribution. A closed-form expression does not exist for the sum distribution and, furthermore, it is difficult to numerically calculate the distribution. Numerous approximations exist that are based on approximating a sum of lognormal random var... View full abstract»

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  • Multiple source Cooperation diversity

    Publication Year: 2004 , Page(s): 712 - 714
    Cited by:  Papers (24)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (120 KB) |  | HTML iconHTML  

    We propose a new class of cooperative diversity schemes based on joint coding of the data of multiple wireless users. These schemes can achieve high diversity orders and high code rates. View full abstract»

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  • Improved progressive-edge-growth (PEG) construction of irregular LDPC codes

    Publication Year: 2004 , Page(s): 715 - 717
    Cited by:  Papers (63)  |  Patents (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (136 KB) |  | HTML iconHTML  

    Progressive-edge-growth (PEG) algorithm is known to construct low-density parity-check codes at finite block lengths with very good performance. In this letter, we propose a very simple modification to PEG construction for irregular codes, which considerably improves the performance at high signal-to-noise (SNR) ratios with no sacrifice in low-SNR performance. View full abstract»

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  • Performance analysis of broadcasting schemes in mobile ad hoc networks

    Publication Year: 2004 , Page(s): 718 - 720
    Cited by:  Papers (8)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (184 KB) |  | HTML iconHTML  

    Numerous broadcasting schemes have been proposed to alleviate the broadcast storm problem in high-density ad hoc networks. Little work has been done to model and analyze these schemes. We consider the popular counter-based and distance-based schemes in a unit-disk network model. Through the rigorous theoretic analysis, we achieve statistic results that reveal the relations between network paramete... View full abstract»

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  • List of reviewers

    Publication Year: 2004 , Page(s): 721 - 728
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  • 2004 Index

    Publication Year: 2004 , Page(s): 729 - 751
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  • IEEE Communications Letters Information for authors

    Publication Year: 2004 , Page(s): 752
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  • IEEE Communications Society Information

    Publication Year: 2004 , Page(s): c3
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  • IEEE Communications Letters blank page

    Publication Year: 2004 , Page(s): c4
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Aims & Scope

IEEE Communications Letters  is aimed at satisfying the need for rapid dissemination of information, offering a vehicle for authors to expose their results to be used in future developments. This ensures early recognition of work. 

 

 

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Meet Our Editors

Editor-in-Chief
George K. Karagiannidis
Aristotle University of Thessaloniki
Greece