By Terry Edwards
Explores and demystifies the radio and light-weight frequency applied sciences essential to fulfill the ever-increasing call for for swifter, greater skill broadband communications this day and into the twenty first century. DLC: Broadband conversation platforms.
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Additional info for Gigahertz and Terahertz Technologies for Broadband Communications (Satellite Communications)
The concept of bandwidth efficiency, referred to above, is extremely important. Additionally, the choice of carrier frequency is also highly significant. 40 Gigahertz and Terahertz Technologies for Broadband Communications Most wireless systems, particularly cellular mobiles and cordless phones, utilize carrier frequencies up to a maximum of around 2 GHz (2,000 MHz). This maximum is dictated by a combination of technical and economic parameters. In Chapter 1 we noted that as the carrier (or bearer) frequency rises so also the beamwidth decreases, that is, antennas become increasingly directional.
Here P1, P2, P3 … Pn are the frames, packets, or cells and there is some analogy with FDM in that the actual time intervals extend downwards as the TDM level increases. At the most basic telephone or ex-modem data transmission level, the time intervals could be in the milliseconds (ms) to microseconds ranges. As the multiplexing proceeds to higher levels so the channel time intervals decrease down to the nanosecond (ns), then picosecond (ps), and finally the extremely small femtosecond (fs) intervals.
Many people could be forgiven for imagining that this was practically the ultimate or at least that channel capacities would simply go on increasing—but not much else. Then, originally at CERN in the late 1980s, a guy named Tim Berners-Lee invented HTML—and the world of telecommunications was changed forever with what inevitably followed, namely the Internet. Meanwhile very high-speed broadband systems using fiber optics, satellites, and terrestrial configurations were planned and these would definitely be making a dramatic improvement in terms of getting on to the Internet.