IEEE Communications Magazine

Issue 5 • May 1990

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  • Multicarrier modulation for data transmission: an idea whose time has come

    Publication Year: 1990, Page(s):5 - 14
    Cited by:  Papers (2244)  |  Patents (483)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1094 KB)

    The general technique of parallel transmission on many carriers, called multicarrier modulation (MCM), is explained. The performance that can be achieved on an undistorted channel and algorithms for achieving that performance are discussed. Ways of dealing with channel impairments and of improving the performance through coding are described, and implementation methods are considered. Duplex opera... View full abstract»

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  • The impact of synchronous digital hierarchy on digital microwave radio: a view from Australasia

    Publication Year: 1990, Page(s):16 - 20
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (471 KB)

    The recently agreed upon synchronous digital hierarchy (SDH) standard, which will provide a means to manage, multiplex, and access various forms of digital traffic in an economical and efficient manner, is described, and it is explained how radio systems can be deployed in SDH networks. This is followed by a discussion on the technical requirements for SDH digital radio relay system equipment. Fre... View full abstract»

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  • Novel applications of cryptography in digital communications

    Publication Year: 1990, Page(s):21 - 29
    Cited by:  Papers (2)  |  Patents (59)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1199 KB)

    A tutorial on digital signatures is presented, covering the basic concepts of public-key cryptography and digital signatures based on public-key techniques. Applications are discussed, including key management for conventional encryption equipment, electronic mail and data interchange, access control and audit trails, software verification and virus detection, counterfeit-proof currency, nuclear t... View full abstract»

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IEEE Communications Magazine, considered by most to be their most important member benefit, provides timely information on all aspects of communications: monthly feature articles describe technology, systems, services, market trends, development methods, regulatory and policy issues, and significant global events.

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Osman Gebizlioglu
Huawei Technologies