Abstract
Abstract In many medical image devices, dc noise often prevents normal diagnosis. In wireless capsule endoscopy systems, multipath fadingthrough indoor wireless links induces inter-symbol interference (ISI) and indoor electric devices generate impulsive noise in the receivedsignal. Moreover, dc noise, ISI, and impulsive noise are also found in optical fiber communication that can be used in remote medicaldiagnosis. In this paper, a blind signal processing method based on the biased probability density functions of constant modulus errorthat is robust to those problems that can cause error propagation in decision feedback (DF) methods is presented. Based on this propertyof robustness to error propagation, a DF version of the method is proposed. In the simulation for the impulse response of optical fiberchannels having slowly varying dc noise and impulsive noise, the proposed DF method yields a performance enhancement of approx-imately 10 dB in mean squared error over its linear counterpart.
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