Low Complexity Soft Decision Feedback Equalizer for Multilevel Modulation
This letter presents a soft decision feedback equalizer (SDFE), for multilevel modulation. In contrast to common turbo principle which only uses the extrinsic information from the decoder, the SDFE can be used in the channel equalizer for calculation of the a posteriori probability (APP) by collecting information of the entire block as in maximum aposteriori probability (MAP) algorithm. Replaced hard decision with soft decision reduces the effects of the error propagation. Meanwhile, In contrast to common soft DFE for only BPSK, The SDFE can be used for multilevel modulation, such as MPSK or QAM. Simulation results confirm the superiority of the new proposed equalizer comparing with current low complexity Turbo equalizers with hard decision for High-level modulation.
MMSE equalizer soft feedback decision feedback equalizer, multilevel modulation.
HE Hui-ying CHEN Shao-chang
College of Electrical and information Naval University of Engineering Wuhan, Hubei, P.R.China College of Electrical Engineering Naval University of Engineering Wuhan, Hubei, P.R.China
国际会议
武汉
英文
79-81
2010-05-21（万方平台首次上网日期，不代表论文的发表时间）