A method and a device for transmitting the data over a noisy medium.

摘要

A method and a device for transmitting data within a predetermined frequency range over a noisy medium, wherein a spread spectrum data independent signal formed by a pseudo noise code is mixed with the data to be transmitted for forming a spread spectrum datasignal, which datasignal is modulated and at least 50 % of the power of the modulated datasignal is transmitted within said frequency range, wherein each chip of the data signal to be transmitted is substituted by a wave shaped signal having a raised cosine spectrum, which wave shaped signal is thereafter truncated by means of a truncation window whereby the spectrum broadening is kept limited within said frequency range in order to obtain a further wave shaped signal which is, considered in the time domain, limited within the time of a predetermined period. <IMAGE>