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Communications Magazine, IEEE

Issue 5 • Date May 1995

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Displaying Results 1 - 7 of 7
  • LAN emulation on an ATM network

    Page(s): 70 - 85
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1640 KB)  

    The authors evaluate architecture alternatives relating to the provision of a LAN emulation service over a connection-oriented ATM network, and present the LAN emulation architecture as actually adopted by the ATM Forum LANE SWG. The role of servers is discussed as is the provision of broadcast/multicast services View full abstract»

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  • The software radio architecture

    Page(s): 26 - 38
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    As communications technology continues its rapid transition from analog to digital, more functions of contemporary radio systems are implemented in software, leading toward the software radio. This article provides a tutorial review of software radio architectures and technology, highlighting benefits, pitfalls, and lessons learned. This includes a closer look at the canonical functional partitioning of channel coding into antenna, RF, IF, baseband, and bitstream segments. A more detailed look at the estimation of demand for critical resources is key. This leads to a discussion of affordable hardware configurations, the mapping of functions to component hardware, and related software tools. This article then concludes with a brief treatment of the economics and likely future directions of software radio technology View full abstract»

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  • IEEE Project 802.14: standards for digital convergence

    Page(s): 20 - 23
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    The resurgence of interest in the combination of fiber and coaxial cable has led it to the acronym HFC, for hybrid fiber-coaxial, since it is no longer just the province of cable TV. Many telephone operating companies in North America, Europe, and Asia are moving rapidly to install this type of cable plant, both for its high capacity and for its relative simplicity and ease of maintenance. This is both to provide conventional telephone service, TV distribution, and the emerging information services that come under the information highway umbrella. In response, last year the IEEE 802.6 committee spun off a new group, Project 802.14, devoted to providing standards for the use of the HFC cable plant in supporting both traditional and new services View full abstract»

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  • Direction finding and “smart antennas” using software radio architectures

    Page(s): 62 - 68
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    Operational tests and demonstrations of systems based on software radios are currently being performed in the 800 MHz mobile cellular radio band. These field trials are for mobile unit geolocation systems and adaptive phased array “smart antenna” applications. The geolocation system trials are in response to the demand for high confidence geolocation of mobile units for enhanced emergency 911 service and for use in the US Department of Transportation's Intelligent Vehicle Highway System (NHS) initiative. The smart antenna array application addresses the cellular service providers' need for more user channel capacity and/or geographic coverage from existing base station installations. Software radio architectures were selected because of their ability to provide superior performance at low life cycle cost. These systems use 4 to 8 wideband coherent channels and fully characterize the arriving RF energy to either geolocate the emitter or to maximize the carrier-to-interference ratio View full abstract»

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  • Analog-to-digital converters and their applications in radio receivers

    Page(s): 39 - 45
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    Rapid advances in hardware development of analog-to-digital converters (ADCs) have paved the way for development of radio receivers using digitization at the IF, and in some cases, at the RF. The constraints placed on these receivers due to hardware limitations of these devices are discussed and some examples of high-speed, state-of-the-art ADCs are given View full abstract»

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  • The DSP bottleneck

    Page(s): 46 - 54
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    The stumbling blocks in development of a commercially usable software radio have been the availability of hardware, in particular the fast DSP required. As high performance ADCs have become available commercially, with the sample rates and spurious free dynamic ranges required, hybrid techniques using specialized digital hardware, operating under software control, have become more common View full abstract»

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  • Speakeasy: the military software radio

    Page(s): 56 - 61
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    The Speakeasy Phase II radio will use programmable processing to emulate more than 15 existing military radios. Speakeasy is a challenge, even with recent advancements in DSP technologies. The benefits, however, make the challenge highly worthwhile View full abstract»

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Aims & Scope

IEEE Communications Magazine covers all areas of communications such as lightwave telecommunications, high-speed data communications, personal communications systems (PCS), ISDN, and more.

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Editor-in-Chief
Sean Moore
Centripetal Networks