Coded Decision Feedback Signal Processing: An Alternative to Iterative (Turbo) Signal Processing

Abstract — A non-iterative receiver is proposed to achieve near capacity performance on channels with memory. There are two main ingredients in the proposed design- i) the use of a signal processing block which produces optimal soft estimates of the inputs to the channel given all the observations from the channel and some past symbols exactly ii) The use of an encoder structure that ensures that past symbols can be used in the signal processing block in an error free manner through the use of a capacity achieving code for a memoryless channel. The advantages and disadvantages of this receiver compared to turbo signal processing are discussed and it is shown that when the latency constraint is not too strict, the proposed receiver can be a viable alternative to turbo signal processing. I