Antenna switching based MIMO scheme for IoT

A multi-user access node for receiving concurrent signals from different users, wherein the concurrent signals are carrying chip sequences at a baseband rate and wherein redundancy is present in the chip sequences, the multi-user access node comprising:

• a plurality of antennas organized in an antenna configuration,
• a main transceiver comprising an analog receiver and an analog to digital converter for converting an incoming signal into a digital signal which comprises incoming chip sequences,
• a switch for switching the main transceiver between the plurality of antennas, and
• a controller configured for:
• initializing the multi-user access node by switching the main transceiver between the plurality of antennas to capture a spatial character of the different users based on unique initialization chip sequences from the different users, and
• separating collided chip sequences transmitted by the different users by switching the main transceiver between the plurality of antennas according to an applied scrambling sequence and by utilizing the spatial character of the different users in combination with the applied scrambling sequence.