Network-Coded CSI Sharing in MU-MIMO Systems

The patent combines multiple quantized CSI parameters (channel quality information, channel direction information, and precoding matrix information) into a single network-coded composite signal. Nodes perform XOR operations on received quantized CSI from different sources, merging redundant information into compact coded representations that reduce overall transmission overhead while preserving essential channel state knowledge.

The patent introduces network coding as an intermediary process between CSI generation and CSI utilization. Instead of directly transmitting raw quantized CSI between all node pairs, the system uses network-coded composite signals as intermediaries that encapsulate multiple CSI components, thereby reducing the number of direct transmissions required while still enabling global CSI acquisition.

Multiple CSI transmissions are merged into single network-coded composite signals. Instead of requiring separate time slots for each CSI parameter transmission between node pairs, the system combines CQI, CDI, and PMI information into unified coded signals that can be transmitted more efficiently, reducing the total number of time slots required for global CSI acquisition.

The patent performs preliminary network coding operations at the source nodes before transmission. By pre-processing and encoding CSI information into composite signals that contain multiple layers of channel state data, nodes prepare information in advance so that receiving nodes can decode complete CSI sets with fewer subsequent transmissions, thereby reducing overall time slot requirements.

The patent segments the network-coded composite signal into distinct CSI components (CQI, CDI, PMI) that can be independently decoded. Receiving nodes use their locally available quantized CSI to selectively extract and decode only the specific components they need, rather than processing entire composite signals. This segmentation approach reduces decoding complexity by allowing partial processing based on local information availability.

Each receiving node uses its own locally stored quantized CSI as a key to decode the network-coded composite signals it receives. The local CSI serves as a self-contained reference that enables each node to independently extract the specific channel state information it needs without requiring complex centralized decoding or extensive inter-node coordination, thereby reducing overall system decoding complexity.