Receiver Circuit DMRS Interference Cancellation

The patent converts the harmful interference between non-orthogonal DMRS ports into a beneficial signal by estimating and subtracting the interfering signal components. The receiver estimates channel responses for multiple DMRS ports including interferers, reconstructs the interfering signals using these channel estimates, and subtracts them from the received signal. This transforms the harmful interference into a predictable and removable component, allowing non-orthogonal ports to be used without performance degradation.

The patent applies preliminary action by estimating channel responses for all DMRS ports (including interferers) before the actual data detection process. The receiver performs channel estimation, signal reconstruction, and interference subtraction in advance, creating a cleaned signal that is then used for straightforward data detection. This preliminary processing separates the complex interference cancellation task from the main detection flow, making the overall system more manageable despite the added complexity.

The patent applies segmentation by dividing the channel estimation process into separate stages for different DMRS ports. The receiver estimates channel responses for each DMRS port individually (including both desired and interfering ports), then uses these separate estimates to reconstruct and subtract interfering signals. This segmented approach allows accurate channel estimation for multiple ports without requiring a single overly complex estimation algorithm, making the processing more manageable while maintaining high accuracy.