How the Framework of Expectation Propagation Yields an Iterative IC-LMMSE MIMO Receiver

Based on the expectation propagation framework, the authors derive a MIMO detector that consists of an Interference Cancellation (IC) step, followed by Linear Minimum Mean Square Error (LMMSE) filtering. The distinguishing feature of their algorithm, compared to conventional IC-LMMSE detectors for iterative MIMO receivers, is the way how they compute the symbol statistics that are used in the IC and LMMSE steps. In an earlier publication, it has been shown empirically that full posterior feedback from the decoder to the IC-LMMSE detector can outperform the usual choice of extrinsic feedback, which seems to contradict the Turbo principle.

Provided by: Institute of Electrical and Electronics Engineers Topic: Mobility Date Added: Oct 2011 Format: PDF

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