Enhanced system architecture for rugged wide band data transmission

In this paper, an enhanced architecture for wide band data transfer based on a true differential modulation is presented, showing extremely high resistance against dispersion and fading due to multi-path propagation. The proposed system operates well with minor frequency stabilizing requirements and is characterized by a low part count. Since the modulation is based on the phase difference between two propagating modes, spread spectrum techniques are easily implemented. Experimental results of a transmission over a distance of 45 m with a single carrier frequency using noise to spread the spectrum are presented for a data rates of up to 25 MBit/s. Furthermore, the system is resistant against Doppler shifts and small banded jamming, so that it can be used to improve data transfer rates in mobile systems.