Interstellar communication: The case for spread spectrum

Interstellar Communication: The Case for Spread Spectrum

Spread spectrum, widely employed in modern digital wireless terrestrial radio systems, chooses a signal with a noise-like character and much higher bandwidth than necessary. This paper advocates spread spectrum modulation for interstellar communication, motivated by robust immunity to radio-frequency interference (RFI) of technological origin in the vicinity of the receiver while preserving ful...

Interstellar Spread Spectrum Communication: Receiver Design for Plasma Dispersion

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The Case for Spread-spectrum Signaling in Interstellar Messaging

A particular challenge for SETI searches is choosing the type of signal to seek. Past applications of communication theory to this issue have failed to infer any credible concrete characteristics of a signal on the basis of standard measures of detection sensitivity such as detection and false alarm probabilities. However, these efforts have also ignored radiofrequency interference, which is a ...

Design of a High Range, High Efficiency Spread Spectrum Transmitter for Audio Communication Applications

This work proposes a direct sequence spread spectrum transmitter with high transmission range and efficiency for audio signals. It is shown that by choosing high process gain for spread spectrum signal the data could reach a range of 55km in the 2.4GHz ISM band. By employing a light modulation scheme, we have a relaxed SNR requirement for having a low bit error rate (BER) which translates to re...

Principles of Spread-spectrum Communication Systems Principles of Spread-spectrum Communication Systems