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Performance of Iterative Soft Decision Feedback Equalizers for Single-Carrier Transmission
Taehyun Jeon,Seokhyun Yoon,Kyungho Kim(김경호) 대한전기학회 2017 Journal of Electrical Engineering & Technology Vol.12 No.3
In this paper, we consider iterative soft-decision feedback equalizers (sDFE), a.k.a. turbo equalizers for single-carrier transmission. Turbo equalizer takes log-likelihood ratio (LLR) feedback from channel decoder and convert the LLR into symbol estimates and variances to be used for the LLR update at the sDFE. Specifically, we consider both time domain and frequency-domain sDFE and compare their performances. The results shows that frequency-domain sDFE performs better than time-domain one and also that considerable gain can be obtained especially when the channel has deep nulls.