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Performance Analysis of an Adaptive Threshold Hybrid Double-Dwell System with Antenna Diversity for Acquisition in DS-CDMA Systems

Authors: H. Krouma, M. Barkat, K. Kemih, M. Benslama, Y. Yacine

Abstract:

In this paper, we consider the analysis of the acquisition process for a hybrid double-dwell system with antenna diversity for DS-CDMA (direct sequence-code division multiple access) using an adaptive threshold. Acquisition systems with a fixed threshold value are unable to adapt to fast varying mobile communications environments and may result in a high false alarm rate, and/or low detection probability. Therefore, we propose an adaptively varying threshold scheme through the use of a cellaveraging constant false alarm rate (CA-CFAR) algorithm, which is well known in the field of radar detection. We derive exact expressions for the probabilities of detection and false alarm in Rayleigh fading channels. The mean acquisition time of the system under consideration is also derived. The performance of the system is analyzed and compared to that of a hybrid single dwell system.

Keywords: Adaptive threshold, hybrid double-dwell system, CA-CFAR algorithm, DS-CDMA.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1081822

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References:


[1] Polydoros and C. L. Weber, "A unified approach to serial search spreadspectrum code acquisition-Part I : General theory," IEEE Transaction Communication, vol.COM-32, no.5, May 1984.
[2] E. A. Sourour, S. C. Gupta, "Direct-sequence spread-spectrum parallel acquisition in a fading mobile channel, "IEEE Transaction communication, vol.COM-38, no. 7, July 1990.
[3] C. Baum and V. Veeravalli, "Hybrid acquisition schemes for direct sequence CDMA systems," IEEE, International Conference on Communications, 1994, vol. 3, pp. 1433-1437.
[4] W. Zhuang, "Noncoherent hybrid parallel PN code acquisition for CDMA mobile communications," IEEE Transaction on Vehicular Technology, vol. 45, no. 4, p. 643-656, 1996.
[5] Polydoros, and C. L. Weber," A unified approach to serial search spread spectrum code acquisition-Part II: A matched filter receiver," IEEE Transaction Communication, vol. 32, no. 5, pp. 550-560, May 1994.
[6] J. Linatti, "On the threshold setting principles in code acquisition of DSSS signals," IEEE Journal on Selected Areas in Communications, vol.18, no.1, p. 62-72, January 2000.
[7] H. Oh, D. Han, and C. Kim, "An environmental robust PN code acquisition architecture in DS-CDMA systems," CIC 2000, vol, , Seoul, Korea, Nov 2000, pp. 201-205.
[8] H. Kim, I. Song, Y. Lee, S. Kim, and Y. Kim, "Double-dwell serialsearch PN code acquisition using a non parametric detection in DS/CDMA systems," MILCOM 1999-IEEE Military Communications Conference, no.1, October 1999, pp.571-574.
[9] D.M. Dicarlo, and C.L. Weber, "Multiple dwell serial acquisition of direct sequence signals acquisition," IEEE Transaction Communication, vol. 31, no. 5, p. 650-659, 1983.
[10] R. Rick and L. Milstein, "Parallel acquisition of spread-spectrum signals with antenna diversity," IEEE Transaction Communication, vol. COM- 45, no. 8, p. 903-905, 1997.
[11] Y. Tokgoz, B. D. Rao, M. Wengler, and B. Judson, "Performance analysis of optimum combining in antenna array systems with multiple interferers in flat Rayleigh fading," IEEE Transaction communication, vol. 52, no. 7, pp. 1047-1050, July 2004.
[12] H. Sock, C. Hyun, and D. Seog, "Adaptive hybrid PN code acquisition with antenna diversity in DS-CDMA systems," IEEE Transaction Communication, vol. E85-B. no. 4, p. 716-721, April 2002.
[13] Viterbi, CDMA principles of spread spectrum communication, Addison- Wesley, Massachusetts, 1995.