Digital retro-directive communication system and method thereof

摘要

The present invention relates to a digital retro-directive system and method thereof for receiving incoming signals from a transmitting source by means of at least two antennas and transmitting outgoing signals back, substantially simultaneously, towards said transmitting source through said at least two antennas irrespective of the location of one antenna with respect to another and without calculating phase differences between said outgoing signals.

主权项

1. A system configured to transmit a signal back towards a transmitting source, the system comprising:
a) a retro directive apparatus composed of a single corner reflector carrying a plurality of antennas at either surface thereof; and b) a plurality of communication units each communication unit connected to a corresponding one of the antennas, the communication unit comprising:
b.1. a receiver for receiving a signal from a transmitting source;b.2. an Analog-to-Digital (A/D) unit for sampling the received signal for a predefined period of time, giving rise to signal samples;b.3. a digital memory unit for storing the signal samples of said received signal in its memory in a given sampling order, on a time scale;b.4. a processing unit for reconstructing a signal by using said signal samples as data carriers, giving rise to a reconstructed digital signal;b.5. a Digital-to-Analog (D/A) unit for converting said reconstructed digital signal to a reconstructed analog signal to be transmitted; andb.6. a transmitter for transmitting said reconstructed analog signal to be reflected from said corner reflector back towards said transmitting source substantially simultaneously from each of said at least two antennas;wherein said processing unit for reconstructing a signal is configured to:
decide about at least one sub-group of wideband signal samples, independently of the bandwidth and modulation of said transmitted signal, that are sampled within said predefined period of time; perform spectral decomposition of signal samples, giving rise to a set of frequency components; modulate each of said frequency components of said set by means of a modulation unit; reconstruct said signal by using said signal samples as data carriers, giving rise to a reconstructed digital signal; and modulate said reconstructed digital signals utilizing each of said frequency components of said set, respectively.