| 摘要 |
PURPOSE:To perform the inverse spread of an SS signal with simple constitution and to keep actual data transmission speed high by performing an inverse spread spectrum processing by applying full-wave rectification on a spread spectrum(SS) communication wave, and generating a frequency twice the original carrier frequency of the communication wave. CONSTITUTION:A spread spectrum(SS) wave spectral-distributed centering the frequency f0 received with a receiver is converged to 2f0 with a full-wave rectifier means 1. In other words, the SS wave is the one in which a carrier with the frequency f0 is spread and modulated with a spread code, and is formed in a waveform to be sent as the carrier as it is when a spread code is set at a high level and the waveform as the carrier whose phase is inverted when the code is set at a low level. Therefore, the wave can be converged as the wave with a fundamental frequency 2f0 by applying the full-wave rectification on the SS wave with the full-wave rectifier means 1, and inverse spread spectrum is completed, Furthermore, data can be demodulated from the wave with the frequency 2f0 by passing the wave through a detector 28. Thereby, the inverse spread of the SS signal can be performed with simple constitution, and the actual data transmission speed can be kept high. |
