CHANNEL ESTIMATION THROUGH DYNAMIC PORT ALLOCATION IN UPLINK TRANSMISSION FOR MULTI-USER, MULTIPLE-INPUT, MULTIPLE-OUTPUT (MU- MIMO) SYSTEMS

1 . A method of enabling transmission of uplink signal in a Multi-User Multiple Input Multiple-Output (MU-MIMO) system through dynamic DM-RS port allocation in a 5G New Radio network, the method comprising:

creating ( 502 ), by a priority Quality of Service (QoS) scheduler, a scheduling information and a scheduling decision for MU-MIMO Scheduling of a plurality of User equipment's (UE's);

transmitting ( 504 ) the scheduling information as Downlink Control Indicator (DCI) payload bits over a Physical Downlink Control Channel (PDCCH) to the one or more paired UEs;

Demultiplexing ( 506 ), by a demultiplexer (UE DE−MUX ), one of more paired UEs of the plurality of UE's based on the scheduling information;

performing ( 508 ) a Physical Uplink Shared Channel (PUSCH) Modulation based on the scheduling information extracted from the PDCCH from the one or more paired UEs;

performing ( 510 ) Cyclic Redundancy Check (CRC) encoding and bit processing of the DCI payload bits obtained from each of the one or more UE's;

performing ( 512 ), at a receiver, at least one of data modulation mapping, layer mapping, precoding and resource mapping of a processed DCI payload bit data;

performing ( 514 ) antenna resource remapping and beam combining on the PUSCH channel; and

selecting ( 516 ), by a resource de-mapper at the receiver, DM-RS references from a received DM-RS sequence or and the PUSCH payload for channel estimation; and

obtaining ( 518 ), by a channel estimator unit, at the receiver improved channel estimates by dynamically reducing a despreading factor in Variable Spreading Factor Orthogonal Cover Code (VSFOCC) based on a Partial port occupancy (P-Poi) at a Base-station,

wherein the channel estimates obtained are interpolated ( 520 ) using a liner or DFT interpolator to estimate the channel over N PRB subcarriers.

2 . The method of claim 1 , further comprising:

inputting the determined channel estimates to an equalizer module; and

performing one or more of demodulation, scrambling, Low-Density Parity-Check (LDPC) processing and CRC detachment of the inputted channel estimates.

3 . The method of claim 1 , wherein the scheduling decisions comprises at least one of user pairing details, user layers, Modulation and Coding Scheme (MCS) assignment and resource assignment across time frequency grids.

4 . The method of claim 1 , wherein bit processing comprises at least one of Code Block segmentation, LDPC Encoding, Rate-Matching, Code-block concatenation and Scrambling at ULSCH (Uplink transport block).

5 . The method of claim 4 , further comprising:

performing a Hybrid automatic repeat request (HARQ) Process for each transport block by storing different Redundancy version (RV) of the data for each code-block corresponding to the ULSCH for retransmission; and

scheduling HARQ retransmissions based on CRC failure and data corresponding to HARQ process data maintained in a HARQ buffer.

6 . The method of claim 1 , wherein the Scheduling Aware UE Port Mapper performs port assignment for reference signal (DM-RS) ports based on a Scheduling Information structure, where the Scheduling Information structure to assign the DM-RS ports comprises data layers, allocated MCS and the number of antenna ports.

7 . The method of claim 1 , wherein channel estimation is performed through at least one of least square, OCC de-spreading, frequency domain interpolation and denoising and time axis interpolation of DMRS reference signals.

8 . The method of claim 1 , wherein the PUSCH resources to be mapped to time-frequency grid is derived from the Scheduling Information.

9 . The method of claim 1 , wherein the priority QoS scheduler creates the scheduling information based on the PHY measurements and buffer status of the uplink PDI from the higher layers.

10 . The method of claim 1 , wherein the PUSCH data generated from the one or more UEs are combined through a Precoder, mapped to antennae through Antenna Mapping and subjected to orthogonal frequency-division multiplexing (OFDM) Modulation and Radio Processing at the UE.

11 . A Multi-User Multiple Input Multiple-Output (MU-MIMO) system ( 400 ) for enabling transmission of uplink signal through dynamic DM-RS port allocation in a 5G New Radio (NR) network, the system comprising:

a transmitter ( 402 ) comprising of:

a priority Quality of Service (QoS) scheduler ( 404 ) to:

generate a scheduling information and a scheduling decision for MU-MIMO Scheduling of a plurality of User equipment's (UE's);

transmit the scheduling information as Downlink Control Indicator (DCI) payload bits over a Physical Downlink Control Channel (PDCCH) to one or more paired UEs;

a demultiplexer (UE DE−MUX ) ( 406 ) to demultiplex one of more paired UEs of the plurality of UE's based on the scheduling information;

a Physical Uplink Shared Channel (PUSCH) Modulation unit ( 408 ) to perform a PUSCH modulation based on the scheduling information extracted from the PDCCH from the one or more paired UEs;

a Cyclic Redundancy Check (CRC) Unit ( 410 ) to perform Cyclic Redundancy Check (CRC) encoding and bit processing of the DCI payload bits obtained from each of the one or more paired UEs; and

a receiver comprising of:

a Scheduling Aware UE Port Mapper Unit ( 416 ) to:

perform at least one of data modulation mapping, layer mapping, precoding and resource mapping of a processed DCI payload bit data;

perform antenna resource remapping and beam combining on the PUSCH channel; and

select DM-RS references from a received DM-RS sequence or and the PUSCH payload for channel estimation; and

a channel estimator unit ( 418 ) to obtain improved channel estimates by dynamically reducing a despreading factor in Variable Spreading Factor Orthogonal Cover Code (VSFOCC) based on a Partial port occupancy (P-Poi) at a Base-station,

an interpolator ( 420 ) to interpolate the channel estimates obtained to estimate the channel over N PRB subcarriers.

12 . The system ( 400 ) of claim 11 , wherein the channel estimator unit ( 418 ) is further configured to:

input the determined channel estimates to an equalizer module; and

perform one or more of demodulation, scrambling, Low-Density Parity-Check (LDPC) processing and CRC detachment of the inputted channel estimates.

13 . The system ( 400 ) of claim 11 , wherein the scheduling decisions comprises at least one of user pairing details, user layers, Modulation and Coding Scheme (MCS) assignment and resource assignment across time frequency grids.

14 . The system ( 400 ) of claim 11 , wherein bit processing comprises at least one of Code Block segmentation, LDPC Encoding, Rate-Matching, Code-block concatenation and Scrambling at ULSCH (Uplink transport block).

15 . The system ( 400 ) of claim 14 , wherein the Scheduling Aware UE Port Mapper Unit is further configured to:

perform a Hybrid automatic repeat request (HARQ) Process for each transport block by storing different Redundancy version (RV) of the data for each code-block corresponding to the ULSCH for retransmission; and

schedule HARQ retransmissions based on CRC failure and data corresponding to HARQ process data maintained in a HARQ buffer.

16 . The system ( 400 ) of claim 11 , wherein the Scheduling Aware UE Port Mapper Unit performs port assignment for reference signal (DM-RS) ports based on a Scheduling Information structure, where the Scheduling Information structure to assign the DM-RS ports comprises data layers, allocated MCS and the number of antenna ports.

17 . The system ( 400 ) of claim 11 , wherein the channel estimator unit performs channel estimation through at least one of least square, OCC de-spreading, frequency domain interpolation and denoising and time axis interpolation of DMRS reference signals.

18 . The system of claim 11 , wherein the PUSCH resources to be mapped to time-frequency grid is derived from the Scheduling Information.

19 . The system of claim 11 , wherein the priority QoS scheduler creates the scheduling information based on the PHY measurements and buffer status of the uplink PDU from the higher layers.

20 . The system of claim 11 , wherein the PUSCH data generated from the one or more UEs are combined through a Precoder, mapped to antennae through Antenna Mapping and subjected to orthogonal frequency-division multiplexing (OFDM) Modulation and Radio Processing at the UE.