This chapter is dedicated to nonexhaustive extensions of the turbo principle turned toward interleaving pattern generation in a scalable way, advanced turbo-equalization and turbo-MIMO techniques intended to enhance performance using accurate channel estimation.
The turbo concept will be extended to other digital signal processing of wireless communications to improve receiver performance. Joachim Hagenauer presents an overview of the “turbo principle” applied to wireless communications [HAG04] and its extension to coded MIMO and pre-coded QAM symbols with irregular channel codes. The “turbo principle” is a general principle in decoding and detection where digital processing is integrated in a local loop characterized by two inputs and one output. One of the inputs uses the receiver information and the second one exploits the digital processing of the local loop structure issuing from the previous iteration associated with the feedback of the extrinsic information of the digital signal processing. The turbo processing involves a dedicated transmitter structure described as a parallel or a serially concatenated ...