Title :
A quadratic sigmoid neural decision feedback equalizer for nonlinear digital magnetic recording channels
Author :
Choi, Sooyong ; Ong, Sunghwan ; You, Cheolwoo ; Hong, Daesik
Author_Institution :
Dept. of Electr. Eng., Yonsei Univ., Seoul, South Korea
Abstract :
A new neural equalizer is proposed in order to compensate for intersymbol interference (ISI) and to mitigate nonlinear distortions in digital magnetic recording systems and to strengthen the bit error rate (BER) performance of conventional neural decision feedback equalizer (NDFE). The proposed quadratic sigmoid neural decision feedback equalizer (QSNDFE) uses a quadratic sigmoid function as the activation function of the neural networks. We present some computer simulation results of the BER performance in nonlinear digital magnetic recording channels-the nonlinear Lorentzian channel model and the partial erasure model. The BER performance of QSNDFE is compared to that of conventional decision feedback equalizer (DFE) and conventional NDFE. Also, the characteristics of MSE (mean square error) of each equalizer is analyzed. It is shown that the QSNDFE outperforms both DFE and NDFE
Keywords :
backpropagation; decision feedback equalisers; digital magnetic recording; intersymbol interference; multilayer perceptrons; nonlinear distortion; BER performance; ISI compensation; MSE; NDFE; QSNDFE; activation function; bit error rate; computer simulation results; intersymbol interference; mean square error; multilayer perceptron; neural decision feedback equalizer; nonlinear Lorentzian channel model; nonlinear digital magnetic recording channels; nonlinear distortions; partial erasure model; quadratic sigmoid function; quadratic sigmoid neural DFE; quadratic sigmoid neural decision feedback equalizer; Bit error rate; Decision feedback equalizers; Digital magnetic recording; Interference; Magnetic analysis; Multilayer perceptrons; Neural networks; Neurofeedback; Nonlinear distortion; Telecommunications;
Conference_Titel :
Global Telecommunications Conference, 1998. GLOBECOM 1998. The Bridge to Global Integration. IEEE
Conference_Location :
Sydney,NSW
Print_ISBN :
0-7803-4984-9
DOI :
10.1109/GLOCOM.1998.776682
