Scale Time Offset Robust Modulation (STORM) in a Code Division Multiaccess Environment

Authors: David M. Jenkins Jr.

Abstract:

Scale Time Offset Robust Modulation (STORM) [1]– [3] is a high bandwidth waveform design that adds time-scale to embedded reference modulations using only time-delay [4]. In an environment where each user has a specific delay and scale, identification of the user with the highest signal power and that user-s phase is facilitated by the STORM processor. Both of these parameters are required in an efficient multiuser detection algorithm. In this paper, the STORM modulation approach is evaluated with a direct sequence spread quadrature phase shift keying (DS-QPSK) system. A misconception of the STORM time scale modulation is that a fine temporal resolution is required at the receiver. STORM will be applied to a QPSK code division multiaccess (CDMA) system by modifying the spreading codes. Specifically, the in-phase code will use a typical spreading code, and the quadrature code will use a time-delayed and time-scaled version of the in-phase code. Subsequently, the same temporal resolution in the receiver is required before and after the application of STORM. In this paper, the bit error performance of STORM in a synchronous CDMA system is evaluated and compared to theory, and the bit error performance of STORM incorporated in a single user WCDMA downlink is presented to demonstrate the applicability of STORM in a modern communication system.

Keywords: Pseudonoise coded communication, Cyclic codes, Code division multiaccess

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1073433

References:

[1] D. M. Jenkins, "Scale Time Offset Robust Modulation for code division multiaccess," in IEEE Military Communications Conference, pp. 1-4, October 2009.
[2] P. S. Wyckoff, R. K. Young, and D. McGregor, "Scale Time Offset Robust Modulation," in IEEE Military Communications Conference, pp. 330-335, October 2003.
[3] P. S. Wyckoff and R. K. Young, "Comparing STORM and matched filtering for Part 15 indoor multi-path communication channels," in IEEE Consumer Communications and Networking Conference, pp. 347-351, January 2004.
[4] Y. Chao and R. A. Scholtz, "Optimal and suboptimal receivers for ultrawideband transmitted reference systems," in IEEE Global Telecommunications Conference, vol. 2, pp. 759-763, December 2003.
[5] R. M. Gagliardi, "A geometrical study of transmitted reference communication systems," IEEE Transactions on Communication Technology, vol. 12, pp. 118-123, December 1964.
[6] M.-H. Chung and R. A. Scholtz, "Comparison of transmitted- and stored-reference systems for ultra-wideband communications," in 2004 IEEE Military Communications Conference, vol. 1, pp. 521-527, October 2004.
[7] M. R. Karim and M. Sarraf, W-CDMA and CDMA2000 for 3G Mobile Networks. McGraw-Hill, 2002.
[8] R. K. Young, Wavelet Theory and Applications. Kluwer Academic Publishers, 1993.
[9] W. D. T. Davies, System Identification for Self-Adaptive Control. Wiley- Interscience, 1970.
[10] T. Kasami, "Weight distribution formula for some class of cyclic codes." University of Illinois, April 1966. Coordinated Science Laboratory Report R-285.
[11] R. Gold, "Maximal recursive sequences with 3-valued recursive crosscorrelation functions," IEEE Transactions on Information Theory, vol. IT-14, pp. 154 - 156, 1968.
[12] N. K. Bose, Digital Filters; Theory and Applications. Krieger, 1993.
[13] S. S. Argawal and D. W. Matolak, "Quadrature phase shift keying direct sequence-spread spectrum code division multiple access with disparate quadrature chip and data rates," in Proceedings of the 38th Southeastern Symposium on System Theory, pp. 118-122, March 2006.
[14] M. B. Pursley, "Performance evaluation of phase coded spread spectrum communication - part I system analysis.," IEEE Transactions on Communications, vol. 25, no. 8, pp. 795-799, 1977.
[15] A. Richardson, WCDMA Design Handbook. Cambridge University Press, 2005.
[16] M. C. Jeruchim, P. Balaban, and K. S. Shanmugan, Simulation of Communication Systems Modeling, Methodology and Techniques. Kluwer Academic Publishers, 2000. Second Edition.
[17] J. G. Proakis, M. Salehi, and G. Bauch, Contemporary Communications Systems Using Matlab and Simulink. Thomson Brooks Cole, 2004. Second Edition.