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An analog scrambling scheme which does not expand bandwidth, Part II: Continuous time

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The techniques developed in Part I[1] for discrete-time analog scrambling are applied to the problem of scrambling band-limited continuous-time signals or waveforms. The idea behind the waveform scrambler is to sample the waveform (which is assumed to be band-limited) at a rate exceeding the Nyquist rate. The resulting sequence of samples is band-limited in the sense of Part I. The discrete-time scrambler described in Part I is applied to this sequence to produce a nearly band-limited scrambled sequence. A scrambled waveform is formed by modulating the amplitudes of a chain of pulses. This scrambled waveform can be transmitted over a band-limited channel, and the original unscrambled waveform can be recovered at the receiver.

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Information Theory, IEEE Transactions on  (Volume:25 ,  Issue: 4 )