Contents
System Specification:
As I said earlier, we are just going to focus on the way signals are transmitted so as to avoid interference and data loss or in their presence minimize it. The system essentially consists of the input or data signal- [x(t)], pseudo noise sequence generator which generates a signal [p(t)] that is unique. Then there is a modulator which modulates the product of the above two signals [y(t)]. This modulated signal is transmitted and at the receiver it is demodulated and the original data signal recovered. There are no particular requirements on the data signal but the pseudo noise needs to have certain properties that help in better transmission.
Working:
As we have stated earlier it works on the principle of Spread Spectrum Technology. In this transmission technique, at the transmitter end, a pseudo – noise code, which is independent of the information data, is employed as a modulation waveform to “spread” the signal energy over a bandwidth much greater than the signal information bandwidth. At the receiver end, the spread signal is received and demodulated using the same pseudo – noise code. This operation is called as Despreading.
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