Abstract
In this paper, an efficient frequency-domain equalizer (FDE) scheme based on minimum mean-square error interference canceling category is proposed for the high-order Faster-Than-Nyquist (FTN). Turbo-like iterative decoding architecture is used to achieve better performance without imposing excessive computational complexity. The details and the proof of soft-decision FDE are given in this paper, and the formulations of FDE employing high-order modulations are also given. The simulation results demonstrate that while 16QAM is applied, FTN systems with FDE can obtain 0.55dB performance gain compared to Nyquist systems with the same spectrum efficiency. In addition, the FDE-FTN system just loses about 0.1dB compared with the MAP-FTN system, while the computational complexity of FDE is only 4.3% of MAP Equalize. Thus, the proposed FDE is a low-complexity and efficient algorithm for the high-order FTN systems.
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