Broadband interference excision in spread spectrum communication systems via fractional Fourier transform

Akay, Olcay; Boudreaux-Bartels, G.F.

doi:10.1109/acssc.1998.750977

Cited by 32 publications

(13 citation statements)

References 18 publications

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“…The proposed multiplexing scheme can generally be employed whatever there is the need to perform radar tasks and send information to one or multiple receivers, especially in application where nodes are far away from eachc other. FrFT waveforms have already been demonstrated to be suitable for MIMO radar systems [19]- [22], as well as for wireless RF communication [23]- [26], underwater communication [27], [28], interference excision [29] and encryption [30].…”

Section: Introductionmentioning

confidence: 99%

Fractional fourier based waveform for a joint radar-communication system

Gaglione

Clemente

Ilioudis

et al. 2016

2016 IEEE Radar Conference (RadarConf)

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Abstract-The increasing demand of spectrum resources and the need to keep the size, weight and power consumption of modern radar as low as possible, has led to the development of solutions like joint radar-communication systems. In this paper a novel Fractional Fourier Transform (FrFT) based multiplexing scheme is presented as joint radar-communication technique. The FrFT is used to embed data into chirp sub-carriers with different time-frequency rates. Some optimisation procedures are also proposed, with the objective of improving the bandwidth occupancy and the bit rate and/or Bit Error Ratio (BER). The generated waveform is demonstrated to have a good rejection to distortions introduced by the channel, leading to low BER, while keeping good radar characteristics compared to a widely used Linear Frequency Modulated (LFM) pulse with same duration and bandwidth.

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Section: Introductionmentioning

confidence: 99%

Fractional fourier based waveform for a joint radar-communication system

Gaglione

Clemente

Ilioudis

et al. 2016

2016 IEEE Radar Conference (RadarConf)

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“…For nonstationary interference, some other transform may be more suitable [4]. Therefore, the transformation should be adaptive to achieve optimal performance under varying interference conditions.…”

Section: Introductionmentioning

confidence: 99%

“…The receiver is a conventional DS receiver, where interference suppression precedes demodulation [4].…”

Section: Introductionmentioning

confidence: 99%

Transform-selective interference suppression algorithm for spread-spectrum communications

Aromaa

Henttu

Juntti

2005

IEEE Signal Process. Lett.

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An adaptive method for suppressing interference with an unknown model is presented. The method is based on computation of several transforms in parallel and selecting the most suitable one depending on a priori unknown the interference type based on a compression gain (CG) metric, which is related to the interference concentration in the transform domain. It is also possible to estimate the a priori parameters required by some transforms. The method can be expanded to utilize an arbitrary number of transforms. It is shown through computer simulations that the CG is a good metric for choosing the proper domain for interference excision.

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“…The excision process [2,3] is easily realized by masking the bins con taining interference in the domain where the interfer ence and signal are separable. For linear chirp interfer ence excision, the method based on fractional Fourier transform (FRFT) [4] stands out as a good choice be cause FRFT has the ability to confine the interference into a few bins and spread the desired signal over all the bins. However, window function is used to localize 0-7803-8549-7/04/$20.00 © 2004 IEEE the signal in practice.…”

Section: Introductionmentioning

confidence: 99%

“…This windowing operation leads to undesirable side-lobes and the interference does not appear as a single line in the FRFT domain. Remov ing the interference in the side-lobes results in signifi cant performance deterioration, especially when ISR is high [4].…”

Section: Introductionmentioning

confidence: 99%

Broadband interferrence suppression in DS-SS system with modified chirp Fourier transform

Wei¹,

Bi²

The Ninth International Conference onCommunications Systems, 2004. ICCS 2004.

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This paper presents the application of the discrete chirp Fourier transform for interference excision in DS-SS systems. Detailed analysis on the undesirable influence of side-lobes due to windowing operation is provided through both theoretical deviation and experimental results. A new efficient excision method is proposed by using modified DCFT to minimize the distortion from the side-lobes. With a computational complexity in the order of O(Nlog 2 N), the proposed method is shown to achieve a much better performance in terms of bit error rates in the presence of white noise and linear chirp-like interference within a large range of interference to sig nal ratios(ISR).

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Broadband interference excision in spread spectrum communication systems via fractional Fourier transform

Cited by 32 publications

References 18 publications

Fractional fourier based waveform for a joint radar-communication system

Fractional fourier based waveform for a joint radar-communication system

Transform-selective interference suppression algorithm for spread-spectrum communications

Broadband interferrence suppression in DS-SS system with modified chirp Fourier transform

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