Spread Spectrum Based on Semiconductor Superlattices True Random Sequence

A setup for information transmission based on physical random sequence spreading method, which is generated by physical random number generator based on room-temperature chaotic oscillations in weakly coupled semiconductor superlattices, is demonstrated. The spreading processing and auto-correlationg theories are investigated in detail. Then, the temporal waveforms and auto-correlation intensity distributions of plaintext information, physical random sequence and spreaded seauence were experimentally tested respectively. Both theoretical and experimental results indicate that the physical random sequence can effectively use to accomplish spread spectrum, which has significant value in the future secure information transmission.