By Topic

Communications Magazine, IEEE

Issue 5 • Date May 1991

Filter Results

Displaying Results 1 - 4 of 4
  • VLSI for analog/digital communications

    Page(s): 25 - 30
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (600 KB)  

    Present trends and future prospects are discussed, emphasizing the prospects for fuller VLSI integration of low-power digital radio, for applications such as in-building wireless radio receivers. The main concern is with the front end of the receiver, including continuous-time analog and sampled analog VLSI filtering, and technologies that can mix analog and digital on the same chip. Prospects for the use of bipolar complementary metal-oxide semiconductor (BiCMOS) technology in communications are examined. Continuous-time monolithic filtering is discussed. As an example of a central receiver/transmitter component that one would like to integrate monolithically, the frequency synthesizer is considered.<> View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Recent advances in DSP systems

    Page(s): 32 - 45
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1542 KB)  

    Some of the advances that have contributed to the realization of communication systems with programmable digital signal processors (DSPs) are described. DSP architectures are examined, covering the performance improvements resulting from advances in circuitry as well as in architecture. Architectural advances discussed are parallel processing, function generation, integrating analog circuits, and sigma-delta analog-to-digital conversion. DSP applications to high-speed modems, trellis-coded modulation, and echo cancellation are examined. The DSP implementation of a V.32 modem is described.<> View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • High-speed parallel Viterbi decoding: algorithm and VLSI-architecture

    Page(s): 46 - 55
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1147 KB)  

    The Viterbi algorithm (VA) is considered as an example of a fairly complex algorithm that needs to be implemented for high-speed applications. A brief introduction to the algorithm is given, and the state of the art of high-speed Viterbi decoders is reviewed. The three principal levels of introducing additional parallelism into an algorithm-bit level, word level, and algorithm level-are outlined, and a solution for the VA at the bit level is indicated.<> View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A general-purpose framework for CAD algorithms

    Page(s): 56 - 62
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (471 KB)  

    The demands imposed by large circuits on computer-aided design (CAD) systems are discussed, showing how each can be met. In particular, it is shown how a CAD system can handle many tools, accommodation different design environments, provide a flexible interface, provide user-specified constraints, and be platform independent. A complete system, called the Electric VLSI Design System which exhibits all of these features is described.<> View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.

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.

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
Sean Moore
Centripetal Networks