## Adaptive Time-Varying Cancellation of Wideband Interferences in Spread-Spectrum Communications Based on Time-Frequency Distributions (1999)

Venue: | IEEE Trans. Signal Processing |

Citations: | 7 - 0 self |

### BibTeX

@ARTICLE{Barbarossa99adaptivetime-varying,

author = {Sergio Barbarossa and Anna Scaglione and Student Member},

title = {Adaptive Time-Varying Cancellation of Wideband Interferences in Spread-Spectrum Communications Based on Time-Frequency Distributions},

journal = {IEEE Trans. Signal Processing},

year = {1999},

volume = {47},

pages = {957--65}

}

### OpenURL

### Abstract

The aim of this paper is to propose an adaptive method for suppressing wideband interferences in spread spectrum (SS) communications. The proposed method is based on the time--frequency representation of the received signal from which the parameters of an adaptive time-varying interference excision filter are estimated. The approach is based on the generalized Wigner--Hough transform as an effective way to estimate the instantaneous frequency of parametric signals embedded in noise. The performance of the proposed approach is evaluated in the presence of linear and sinusoidal FM interferences plus white Gaussian noise in terms of SNR improvement factor and bit error rate (BER).

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Citation Context ...ttern recognition applied to TFD to recognize the signal “signature” expressed through its instantaneous frequency curve. The tool used for pattern recognition is the generalized Hough transform (=-=HT) [4] for-=- its capability of detecting arbitrary shapes. The method was named Wigner–Hough transformation (WHT) [5]. Given a signal , its WHT is defined as WHT (5) where denotes the Wigner–Ville distributio... |

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Citation Context ...m.ing.uniroma1.it; annas@infocom.ing.uniroma1.it). Publisher Item Identifier S 1053-587X(99)02136-4. 1053–587X/99$10.00 © 1999 IEEE Several works deal with the suppression of narrowband interferenc=-=es [13]-=-, [18], [19], [25]. Indeed, SS systems offer a good interference rejection capability for narrowband interferences. In fact, an SS sequence is not easily predictable because it appears to be noise-lik... |

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Citation Context ...d track the useful signal, instead of the interference, with obvious shortcomings. In this work, we propose an extension of the method proposed in [2] using the so-called Wigner–Hough transform (WHT=-=) [5]-=-. The method assumes that i) the interference has constant amplitude (or is the sum of constant amplitude signals) and that ii) the instantaneous frequency assumes a known parametric form (but the par... |

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Citation Context ...appears to be noise-like (unless the code is known, of course). Conversely, if the interference is a predictable process, it can be predicted from the observation and then canceled (see, for example, =-=[16]-=- or [25] and the references therein). The situation is more complicated in the presence of wideband interferences. Two models have been considered for wideband interferences: white noise [20] and line... |

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Citation Context ... annas@infocom.ing.uniroma1.it). Publisher Item Identifier S 1053-587X(99)02136-4. 1053–587X/99$10.00 © 1999 IEEE Several works deal with the suppression of narrowband interferences [13], [18], [19=-=], [25]-=-. Indeed, SS systems offer a good interference rejection capability for narrowband interferences. In fact, an SS sequence is not easily predictable because it appears to be noise-like (unless the code... |

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Citation Context ...e performance of time–frequency based approaches in the analysis of constant amplitude signals embedded in additive white Gaussian noise (AWGN) were proposed in [5] and [15] for linear FM signals, i=-=n [7]-=- and [14] for polynomial-phase signals, and in [6] for the more general class of instantaneous frequency laws expressed in a parametric form. Examples of sinusoidal and hyperbolic FM signals were cons... |

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Citation Context ...e situation is more complicated in the presence of wideband interferences. Two models have been considered for wideband interferences: white noise [20] and linear FM signals (chirp signals) [1], [2], =-=[8]-=-, [11]. From the jammer point of view, the choice between these two categories of signals depends on different requirements or constraints. White noise signals are impossible to predict and then cance... |

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Citation Context ...erein). The situation is more complicated in the presence of wideband interferences. Two models have been considered for wideband interferences: white noise [20] and linear FM signals (chirp signals) =-=[1]-=-, [2], [8], [11]. From the jammer point of view, the choice between these two categories of signals depends on different requirements or constraints. White noise signals are impossible to predict and ... |

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Citation Context ...on. Possible ways to improve the performance of time–frequency based approaches in the analysis of constant amplitude signals embedded in additive white Gaussian noise (AWGN) were proposed in [5] an=-=d [15]-=- for linear FM signals, in [7] and [14] for polynomial-phase signals, and in [6] for the more general class of instantaneous frequency laws expressed in a parametric form. Examples of sinusoidal and h... |

1 |
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Citation Context ...uation is more complicated in the presence of wideband interferences. Two models have been considered for wideband interferences: white noise [20] and linear FM signals (chirp signals) [1], [2], [8], =-=[11]-=-. From the jammer point of view, the choice between these two categories of signals depends on different requirements or constraints. White noise signals are impossible to predict and then cancel, and... |

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Citation Context ... modulus signals, can be tracked and then canceled, working in the time-frequency domain. A parallel approach based on time-scale or multiresolution representations was proposed by Tazebay and Akansu =-=[21]–[-=-23]. The multiresolution-based method is linear, whereas Amin’s method is nonlinear. However, it is known that for particular classes of signals, e.g., chirp signals, the analysis based ons958 IEEE ... |

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Citation Context ..., an adaptive filter was used to track and cancel chirp-like interferences in SS systems. Preliminary works on the cancellation of chirp interferences using adaptive filters were presented in [8] and =-=[24]-=-. In particular, Glisic et al. found out that the performance of the adaptive canceler degrades as the chirp sweep rate increases [11]. Quite recently, Amin proposed a novel approach for suppressing c... |