Optimum Noise Thresholds in Decision Directed Impulse Noise Mitigation for OFDM
نویسندگان
چکیده
This work was supported by an Australian Research Council (ARC) Large Grant. Abstract—Impulse noise is a significant problem in some OFDM applications including digital television broadcasting. In this paper we study the optimum threshold values for a novel decision directed impulse noise mitigation algorithm. In this algorithm the noise component in each received input sample is estimated based on preliminary decisions on the transmitted data. When the noise estimate if above a given threshold, it indicates that impulse noise is present in the sample and the estimated noise component is subtracted from the input sample before final demodulation. In this paper the optimum threshold levels for varying impulse noise parameters are calculated.
منابع مشابه
An Enhanced Median Filter for Removing Noise from MR Images
In this paper, a novel decision based median (DBM) filter for enhancing MR images has been proposed. The method is based on eliminating impulse noise from MR images. A median-based method to remove impulse noise from digital MR images has been developed. Each pixel is leveled from black to white like gray-level. The method is adjusted in order to decide whether the median operation can be appli...
متن کاملBlind Channel Estimation in Multicellular OFDM Systems
The aim of this paper is to compare the performance of Blind channel Estimation in OFDM with pilot based channel estimation. A blind channel estimation is presented for uncoded OFDM. In this method, four steps is done. The four steps are decision algorithm, channel impulse response estimation, channel frequency response estimation and data recovery. The decision algorithm first makes the primar...
متن کاملReceiver Optimization of the L-Band Digital Aeronautical Communication System
In this thesis, we consider the interference cancellation problem for the broadband digital aeronautical communication system. We investigate the L-band digital aeronautical communication system (L-DACS) in the presence of distance measuring equipment (DME) interference. First, we describe the OFDM receiver of the LDACS1. In addition, we discuss the impacts of the DME spectrum on the subcarrier...
متن کاملCharacterisation of impulse noise effects on space-time block-coded orthogonal frequency division multiplexing (OFDM) signal reception
This correspondence presents the characterisation of impulse noise effects on the space-time blockcoded orthogonal-frequency-division-multiplexing (STBC-OFDM) symbol reception, in which the conventional OFDM system is combined with the antenna-diversity/spatial-diversity in order to achieve the high data transmission rates. The weak impulse noise may be combated by the longer OFDM symbol durati...
متن کاملThe Mitigation of the Effect of Impulsive Noise in OFDM-PLC Systems
This paper proposes an new iterative method to recover the signals corrupted by impulsive noise in MIMO-OFDM systems over In-home PLC. In this iterative technique, preliminary decisions are made to get the impulsive noise detection algorithm for finding the locations and amplitudes of the impulses, and then signal estimation block for approximation the signals for two-branch 2*2 MIMO-OFDM at th...
متن کامل