Patent ID: 7154934
Filing Date: 2006-12-26
Classification: H04B

Abstract:
1. A communications system, comprising: a transmission unit cornprising: a noise source for generating a noise signal; a signal generator connected to the noise source and generating a colored noise like preamble from at least the noise signal; a modulator connected to the signal generator for modulating the colored noise like preamble; a switching device having at least a first input, a second input and an output, the first input being connected to the modulator; an ISM spread spectrum modulator connected to the second input of the switching device and providing an ISM transmission signal; and a transmitter connected to the output of the switching device wherein when the switching device is in a first position the colored noise-like preamble is provided as a transmitter output signal and when the switching device is in a second position the ISM transmission signal is provided as the transmitter output signal wherein the colored noise-like preamble is transmitted by the transmitter before the ISM transmission signal; a receiving unit comprising: an antenna for receiving the transmitter output signal transmitted by the transmission unit, the antenna adjusting an antenna pattern for improving reception of the transmitter output signal by the transmission unit; a signal processor connected to the antenna, the antenna producing an antenna output signal including the antenna pattern and the transmitter output signal, the signal processor evaluating the antenna output signal and determining at least the presence of the colored noise-like preamble in the antenna output signal.