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This commit introduces a dedicated simulation environment to validate the uplink MU-MIMO joint processing framework. It models a scenario where a single gNB serves multiple spatially multiplexed UEs sharing the exact same time and frequency resources. The simulator executes the complete physical layer baseband pipeline: - PUSCH data generation and LDPC encoding per UE - OFDM modulation (TX) - Signal propagation through a multi-path channel model - OFDM demodulation (RX) at the gNB - Joint PUSCH decoding, equalization, and spatial demultiplexing Performance metrics such as scrambling errors and BLER per UE is evaluated at the end of the simulation. Signed-off-by: Rakesh Mundlamuri <rakesh.mundlamuri@openairinterface.org>