Bidirectional data communication system, in particular exploiting a CDMA coding and two unidirectional data buses

A communication system, comprising:

• a first data bus configured to transport a first data signal according to a first transmission direction;
• a second data bus configured to transport a second data signal according to a second transmission direction different from the first transmission direction;
• a synchronization-bus configured to transport a synchronization signal;
• a first transceiver unit;
• and
• at least one first resource coupled to the first transceiver unit (P1), configured to generate a first local signal to be transmitted on the first and/or second data bus;
• wherein the first transceiver unit comprises:
• a first receiver coupled to the first data bus to receive the first data signal;
• a second receiver coupled to the second data bus to receive the second data signal;
• a first transmitter coupled to the first data bus;
• a second transmitter coupled to the second data bus;
• a first synchronization module coupled to the synchronization bus to receive the synchronization signal;
• a first demodulator having an input coupled to the first receiver and an output coupled to the first resource, configured to perform a demodulation of the first data signal;
• a second demodulator having an input coupled to the second receiver and an output coupled to the first resource, configured to perform a demodulation of the second data signal received by the second receiver;
• a first modulator having an input coupled to the first resource and an output coupled to the first and second transmitters, configured to receive the first local signal from the first resource and perform a modulation of the first local signal, generating as output a first modulated signal;
• said second transmitter being configured to transmit the first modulated data signal on the second data bus according to said second transmission direction;
• wherein the first transmitter is configured to sum the first modulated signal to the first data signal received by the first receiver from the first data bus, generating a third data signal, and transmit the third data signal on the first data bus according to said first transmission direction and in compliance with a synchronism defined by the synchronization signal;
• and
• wherein the second transmitter is configured to sum the first modulated signal to the second data signal received by the second receiver from the second data bus, generating a fourth data signal, and transmit the fourth data signal on the second data bus according to said second transmission direction and in compliance with said synchronism.