Title :
On the application of chirp modulation in spread spectrum communication systems
Author :
Sarni, Yacine ; Sadoun, Rabah ; Belouchrani, Adel
Author_Institution :
Electr. Eng. Dept., Ecole Nationale Polytechnique, Algiers, Algeria
Abstract :
The paper presents a novel method of enhancing the interference immunity of a direct sequence spread spectrum system. The method is based on applying a chirp signal to modulate the spreaded sequence. At the receiver we apply a time varying filter to recover the transmitted signal. This scheme is well suited for handling stationary as well as non-stationary interference. In addition, our method improves with respect to the conventional system the receiver performance even when the interference is not present. An analytic expression of the receiver SNR is derived. Simulation results show the improvement in terms of the bit error rate of the proposed technique, with respect to the conventional direct sequence spread spectrum
Keywords :
FIR filters; chirp modulation; error statistics; filtering theory; interference suppression; radio receivers; radiofrequency interference; spread spectrum communication; time-varying filters; BER; DS-SS communication systems; FIR filter; bit error rate; chirp modulation; direct sequence spread spectrum system; interference immunity; nonstationary interference; receiver SNR; receiver performance; simulation results; spreaded sequence modulation; time varying filter; transmitted signal recovery; Adaptive filters; Bandwidth; Chirp modulation; Electronic mail; Frequency; Interference; Performance analysis; Signal generators; Signal processing; Spread spectrum communication;
Conference_Titel :
Signal Processing and its Applications, Sixth International, Symposium on. 2001
Conference_Location :
Kuala Lumpur
Print_ISBN :
0-7803-6703-0
DOI :
10.1109/ISSPA.2001.950190
