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Proceedings of the IEEE

Issue 2 • Date Feb. 2002

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Displaying Results 1 - 10 of 10
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  • Space-time codes and concatenated channel codes for wireless communications [Prolog]

    Page(s): 185 - 186
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  • Synthesis of three-dimensional light fields and applications

    Page(s): 222 - 244
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    The possibility of synthesizing light fields satisfying given requirements within a three-dimensional (3-D) space domain was proposed and demonstrated during recent years. In this paper we present fundamental physical properties characterizing 3-D fields and propose analytical and numerical procedures to synthesize them. These methods solve the proper wave equation under 3-D constraints. Since the manipulation of light is a basic task, this is an effective approach to deal with classical as well as novel problems in optics and photonics technologies. We discuss exciting new potential areas of application and extensions of this concept View full abstract»

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  • The state of the art of electric and hybrid vehicles

    Page(s): 247 - 275
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    In a world where environment protection and energy conservation are growing concerns, the development of electric vehicles (EV) and hybrid electric vehicles (HEV) has taken on an accelerated pace. The dream of having commercially viable EVs and HEVs is becoming a reality. EVs and HEVs are gradually available in the market. This paper will provide an overview of the present status of electric and hybrid vehicles worldwide and their state of the art, with emphasis on the engineering philosophy and key technologies. The importance of the integration of technologies of automobile, electric motor drive, electronics, energy storage, and controls and also the importance of the integration of society strength from government, industry, research institutions, electric power utilities, and transportation authorities are addressed. The challenge of EV commercialization is discussed View full abstract»

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  • In his own words: Alfred Norton Goldsmith

    Page(s): 306 - 310
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    This article presents a short review of the life and work of Alfred Norton Goldsmith, founding editor of the Proceedings of the IRE View full abstract»

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  • Space-time codes and concatenated channel codes for wireless communications

    Page(s): 187 - 219
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    Following a brief historical perspective on channel coding, an introduction to space-time block codes is given. The various space-time codes considered are then concatenated with a range of channel codecs, such as convolutional and block-based turbo codes as well as conventional and turbo trellis codes. The associated estimated complexity issues and memory requirements are also considered. These discussions are followed by a performance study of various space-time and channel-coded transceivers. Our aim is first to identify a space-time code/channel code combination constituting a good engineering tradeoff in terms of its effective throughput, bit-error-rate performance, and estimated complexity. Specifically, the issue of bit-to-symbol mapping is addressed in the context of convolutional codes (CCs) and convolutional coding as well as Bose-Chaudhuri-Hocquenghem coding-based turbo codes in conjunction with an attractive unity-rate space-time code and multilevel modulation is detailed. It is concluded that over the nondispersive or narrow-band fading channels, the best performance versus complexity tradeoff is constituted by Alamouti's twin-antenna block space-time code concatenated with turbo convolutional codes. Further comparisons with space-time trellis codes result in similar conclusions View full abstract»

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  • Introduction to "Certain topics in telegraph transmission theory"

    Page(s): 276 - 279
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    In April 1928, Harry Nyquist published the classic paper, "Certain Topics in Telegraph Transmission Theory" in the Transactions of the American Institute of Electrical Engineers. The paper gives a "mathematical" in addition to an "engineering" point of view of the subject matter. The history of digital communications has proved many of the concepts to be fundamental and they inspired and facilitated future developments in communication theory. As the title indicates, a number of important and interesting topics are considered. In this introduction, the author highlights some, though not all, of the topics and results View full abstract»

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  • Certain topics in telegraph transmission theory

    Page(s): 280 - 305
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    The most obvious method for determining the distortion of telegraph signals is to calculate the transients of the telegraph system. This method has been treated by various writers, and solutions are available for telegraph lines with simple terminal conditions. It is well known that the extension of the same methods to more complicated terminal conditions, which represent the usual terminal apparatus, leads to great difficulties. The present paper attacks the same problem from the alternative standpoint of the steady-state characteristics of the system. This method has the advantage over the method of transients that the complication of the circuit which results from the use of terminal apparatus does not complicate the calculations materially. This method of treatment necessitates expressing the criteria of distortionless transmission in terms of the steady-state characteristics. Accordingly, a considerable portion of the paper describes and illustrates a method for making this translation. A discussion is given of the minimum frequency range required for transmission at a given speed of signaling. In the case of carrier telegraphy, this discussion includes a comparison of single-sideband and double-sideband transmission. A number of incidental topics is also discussed View full abstract»

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H. Joel Trussell
North Carolina State University