Channel estimation, throughput and fairness for multi-user, multipleinput, multiple-output (MU-MIMO) systems through dynamic port allocation

A multi-user, multiple-input, multiple-output (MU-MIMO) system to improve channel estimation in 5G New Radio Network, the system comprises:

• a transmitter comprising:
• a Scheduler aware UE port allocation unit to allocate one or more MU-MIMO ports to a plurality of code division multiplexing (CDM) groups for a plurality of UE users;
• a code selection unit to perform code selection according to a number of MU-MIMO ports assigned in the plurality of CDM groups, where a Code Division Multiplexing (CDM) group is a set of time-frequency resources where MU-MIMO ports are multiplexed using orthogonality of codes;
• a scheduler aware UE port mapping unit to allot a reduced de-spreading factor for the users based on the Modulation and Coding Scheme (MCS) and a total number of scheduled user information received from the Scheduler aware UE port allocation unit;
• and
• a spreading factor unit to determine the spreading factor for the allocated one or more MU-MIMO ports in each of the plurality of CDM groups;
• a signalling unit to transmit Downlink Control Information (DCI) signalling of a Partial Port Occupancy (P-Poi) information for each User Equipment;
• and
• a receiver comprising:
• a channel estimator unit to perform channel estimation with variable spreading factor orthogonal cover codes (VSFOCC) de-spreading based on a Partial Port Occupancy (P-Poi) assigned for each of the MU-MIMO ports;
• and
• an interpolator to interpolate the obtained channel estimates over a number of Physical Resource blocks, (NPRB), wherein the interpolator is one of a linear or DFT interpolator, where interpolation along with VSFOCC de-spreading increases performance gain for channels.