Reduced complexity turbo equalization by means of hard output channel decoding

The turbo equalization principle, first proposed by C. Douillard et al. (1995), is a powerful receiver scheme to remove intersymbol interference (ISI) caused by a frequency selective channel. Conventional turbo equalization algorithms combine equalization and soft output channel decoding in an iterative process. Based on the turbo equalization scheme by means of soft ISI cancellation advanced by A. Glavieux et al. (1997), we propose a turbo equalization scheme which uses hard instead of soft output channel decoding. This reduces the implementation complexity significantly. Simulation results for the presented approach are compared to the conventional turbo equalization scheme using soft ISI cancellation.