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Broadband interference excision for software-radio spread-spectrum communications using time-frequency distribution synthesis

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3 Author(s)
S. R. Lach ; Dept. of Electr. Eng., Villanova Univ., PA, USA ; M. G. Amin ; A. R. Lindsey

A new method is introduced for interference excision in spread-spectrum communications that is conducive to software-radio applications. Spare processing capacity in the receiver permits the use of time-frequency techniques to synthesize a nonstationary interference from the time-frequency domain using least squares methods. The synthesized signal is then subtracted from the incoming data in the time domain, leading to jammer removal and increased signal-to-interference-and-noise ratio at the input of the correlator. The paper focuses on jammers with constant modulus that are uniquely described by their instantaneous frequency characteristics. With this a priori knowledge, the jammer signal amplitude is restored by projecting each sample of the synthesized signal to a circle representing its constant modulus. With the phase matching provided by the least squares synthesis method and amplitude matching underlying the projection operation, a significant improvement in receiver performance/bit-error rates is achieved over the case where no projection is performed. Software-radio aspects including computational complexity and processing modes are also discussed

Published in:

IEEE Journal on Selected Areas in Communications  (Volume:17 ,  Issue: 4 )