Non Linear Adaptive Filter for Interference Suppression
نویسندگان
چکیده
Radio Frequency (RF) interference is inherent in all wireless systems and is one of the most significant design parameters of cellular and other mobile systems. In this paper, it is shown that how a non-linear adaptive Volterra filter (Polynomial filter where input and output signals are related through Volterra series) helps track the statistics of the input data and dynamics of a direct sequence spread spectrum (DSSS) system. Comparison between LMS (Least Mean Square) and RLS (Recursive Least Square) algorithms, used in filter adaptation process is shown. Results show that adaptive RLS Volterra filter based DSSS receiver is very efficient in suppressing the broadband BPSK interference.
منابع مشابه
NBI Suppression in Non-Linear UWB Channels using Second Order CPP-ANF
UWB systems are continuously affected by narrow band interference (NBI) emanating from traditional sources for which its mitigation continues to be a challenging issue. This is more so if the channels are considered to be non-linear which in reality is the actual scenario. NBI suppression is an essential element for achieving appropriate quality of service (QoS) and ensuring link reliability. H...
متن کاملPerformance of adaptive linear interference suppression in the presence of dynamic fading
Adaptive linear interference suppression for directsequence (DS) code-division multiple access (CDMA) is studied in the presence of timeand frequency-selective fading. Interference suppression is achieved with an adaptive digital filter which spans a single symbol interval. Both decision-directed and blind adaptive algorithms, which do not require a training sequence, are considered. Modificati...
متن کاملPerformance of an LMS Type Receiver for Interference Suppression in Long Code DS-CDMA on Rayleigh Fading Channels
We consider interference suppression for direct sequence code division multiple access systems when long codes are used for spreading. In particular, we evaluate the performance of a Least Mean Square (LMS) type adaptive receiver on AWGN and correlated Rayleigh fading channels. The receiver uses a chip matched filter followed by an adaptive equalizer structure which performs despreading and int...
متن کاملLinear Reduced-Rank Interference Suppression for DS-UWB Systems Using Switched Approximations of Adaptive Basis Functions
In this work, we propose a novel low-complexity reduced-rank scheme and consider its application to linear interference suppression in direct-sequence ultra-wideband (DS-UWB) systems. Firstly, we investigate a generic reducedrank scheme that jointly optimizes a projection vector and a reduced-rank filter by using the minimum mean-squared error (MMSE) criterion. Then a low-complexity scheme, den...
متن کاملAdaptive Antenna Array Receivers for Spread-Spectrum Signals in Non-Gaussian Noise
We consider the problem of recovering a spread-spectrum (SS) signal in the presence of unknown highly correlated spread-spectrum interference and impulsive noise. In terms of basic system and signal model considerations, we assume availability of a narrowband adaptive antenna array that experiences additive white Gaussian noise in time and across elements, as well as impulsive disturbance with ...
متن کامل