Download now Free registration required
Today, both spread spectrum and automatic equalization of randomly varying linear channel distortions are well-worn tools underlying cellular telephony, high-speed modems and other workhorse practices. But in the early 1950s, attempts to build communication links in which the signal alphabet consisted of wideband pseudorandom waveforms were frustrated by two problems: how to store at physically separate locations clean, synchronized copies of the same waveform, and then how to mitigate the big problem with short-wave communication, the arrival at the receiver of many variously-delayed copies of the transmission, when only one of them was wanted.
- Format: PDF
- Size: 142.5 KB