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"Well informed people know it is impossible to transmit the voice over wires, and that were it possible to do so, the thing would be ofno practical value. " from an editorial in the Boston Post -1865 Fortunately for the telecommunications industry, the unknown author of the above statement turned out to be very mistaken indeed. Even as he spoke, Alexander Graham Bell was achieving the impossible, with a host of competing inventors close behind. The communications revolution which ensued has changed the way in which we live and work, and the way in which we view the world around us. Wired telephone lines now encircle the globe, allowing instantaneous transmission of voice and data. Events from Times Square to Red Square are now as accessible as events on the local courthouse lawn. The advent of wireless communications has extended Bell's revolution to another domain. Personal communications promises voice, data and images which are accessible everywhere. Although predictions are dangerous, a look back over the last decade reveals spectacular growth. In the United States alone, there are now over 50 million cordless phones in use throughout the country -at least one cordless phone for every 3 households - and nearly 20 million pocket pagers. U. S. Cellular telephone service, launched commercially in 1984, has experienced 30-40% annual growth rates despite a sluggish economy.
Sommario
I Propagation Equalization and Interference Rejection.- 1. Measured 900 MHz Complex Impulse Responses in Mountainous Terrain: Relationship to Topographical Map Data.- 2. Blind Adaptive Antenna Arrays for Increased Capacity in Cellular Communications.- 3. Reverse Channel Performance Improvements in CDMA Cellular Communication Systems Employing Adaptive Antennas.- 4. A New Equalizer for Wideband OFDM Over a Frequency-Selective Fading Channel.- 5. Recent Developments in Applying Neural Nets to Equalization and Interference Rejection.- 6. Direct Sequence Spread Spectrum Interference Rejection Using Vector Space Projection Techniques.- 7. Solving the Near-Far Problem: Exploitation of Spatial and Spectral Diversity in Wireless Personal Communication Networks.- II PCS Applications.- 8. A Narrowband PCS Advanced Messaging System.- 9. Multicarrier Permutation Modulation for Narrowband PCS.- 10. Video Compression for Wireless Communications.- III Code Division Multiple Access.- 11. A Low-Power Handheld Frequency-Hopped Spread Spectrum Transceiver Hardware Architecture.- 12. An Overview of Broadband CDMA.- 13. Performance of Direct-Sequence Code-Division Multiple-Access Using Trellis-Coded Orthogonal Signalling.- 14. Noncoherent Spread Spectrum Receiver with Joint Detection and Synchronization Using Modified Matched FIR Filters.- 15. Optimum Acquisition Method Using Parallel Partial Correlator for Spread Spectrum Communication.- IV Simulation, Coding and Multiple Access.- 16. Importance Sampling Methodologies for Simulation of Wireless Communication Links.- 17. Markov Models for Burst Errors in Radio Communications Channels.- 18. Application of Variable-Rate Convolutional Code for Mobile Communications.- 19. Reservation Versus Demand-Assignment Multiplex Strategies for Packet Voice Communication Systems.- V Perspectives on Wireless Communication.- 20. The First Antenna and Wireless Telegraph, Personal Communications System (PCS), and PCS Symposium in Virginia.- 21. Mobile Communications: An IC Designer's Perspective.- 22. Network Connection & Traffic Interchange Agreements - A Wireless Personal Communications Opportunity.- 23. Whither Personal Communications.
Riassunto
"Well informed people know it is impossible to transmit the voice over wires, and that were it possible to do so, the thing would be ofno practical value. In the United States alone, there are now over 50 million cordless phones in use throughout the country -at least one cordless phone for every 3 households - and nearly 20 million pocket pagers.
