Hi all,

In linear MIMO ZF or MMSE, the LLR is calculated by detected signal power over both interference noise power and white noise power. 

In nonlinear MIMO ZF-SIC and MMSE-SIC, the interference noise is cancelled by decision feedback. However, the cancellation may be incorrect, if the decision in the previous layer is error. Hence, the LLR, I think that, is calculated by detected signal power over both white noise power and error decision feedback variance.

However, I dont know how to calculate this LLR.

Does anyone know the solution or provide some references to me?