Robust Multiuser Detection in Chaotic Communication Systems over Non-gaussian Fading Channels

Abstract

In this article, we deal with the problem of robust code division multiple access (CDMA) signal detection in a chaotic communication system transmitting across a Non-gaussian fading channel. Since the performance of robust multiuser detector depends on the selection of M-estimator and the spreading sequences, a new influence function is used to derive an improved robust detector for the problem of data detection in CDMA impulsive fading channels using chaotic spreading. Numerical results show that the proposed robustification offers improved performance over Huber’s minimax detector and outperforms the DPSK decorrelating detector, particularly when the channel is highly impulsive.

Keywords:

• Chaotic modulation
• Fading
• Influence function
• M-estimation
• Non-gaussian noise
• Robust multiuser detection

Additional information

Notes on contributors

B.V.S.S.N. Raju

B. V. S. S. N. Raju received the B.E degree in electronics and communications engineering from Osmania University, Hyderabad, India, in 1990, M.E degree in control systems from Andhra University, Visakhapatnam, India, in 1997. He is working in the department of ECE, SRKR engineering college, Bhimavaram, Andhra Pradesh, since 1992, and presently he is a professor.

Currently, he is working toward Ph.D in Osmania University. His research interests are in the area of robust multiuser detection and chaos-based digital communication systems.

E-mail: [email protected]

K. Deergha Rao

K. Deergha Rao received his B.E (Elect. Engg.). and M.E(Control Systems) degrees from Andhra University, Visakhapatnam, India, in 1977 and 1980, respectively, and Ph.D. degree in electronics and communication engineering from Osmania University, Hyderabad, India, in 1993. He is a senior member of IEEE. He is the chairman of communications and Signal processing societies joint chapter of IEEE Hyderabad Section.

He is presently a professor in the Research and Training Unit for Navigational Electronics, Osmania University. He served as a postdoctoral fellow and part-time professor from March 1999 to March 2003 in the Dept. of ECE, Concordia University, Montreal, Canada. As part-time professor, he has taught the courses Digital Signal Processing and Channel coding to the Master and Ph.D students at, Concordia University.

He has presented papers at IEEE International conferences several times in USA, Switzerland, and Russia. His research interests include GPS signal processing, Wireless channel coding, Blind Equalization, Robust Multiuser detection, OFDM UWB signal processing, Image processing, Cryptosystems, VLSI signal processing. So far, one Ph.D was awarded under his guidance and presently nine students are working toward Ph.D under his guidance. He has more than 100 publications to his credit including 56 publications in IEEE journals and conference proceedings.

E-mail: [email protected]