© 2002 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.

IEEE Transactions on Wireless Communications
Volume 1 Number 1, January 2002

Table of Contents for this issue

Complete paper in PDF format

Interference Control and Chip Waveform Design in Multirate DS-CDMA Communication Systems

Tao Luo, Student Member, IEEE Subbarayan Pasupathy, Fellow, IEEE and Elvino S. Sousa Senior Member, IEEE

Page 56.

Abstract:

We study the interference effects in a multirate DS-code-division multiple-access (CDMA) system. Optimum chip waveform selection with arbitrary shapes is analyzed using a time domain approach. The problem is posed as an interference minimization problem under energy and time-bandwidth constraints and prolate spheroidal wave functions are used to arrive at a solution. Various factors affecting the interference are identified and the trade-off between competing factors is analyzed. The effect of the interchip interference on the optimum chip waveform design is also quantified under a practical bandwidth constraint. We study the benefits of employing two different chip waveforms for two classes of users. We compare the performance of systems employing two different chip waveforms with that of a single-chip waveform system such as IS-95. We show that when the power imbalance is large, it is advantageous to employ two different chip waveforms for different classes of users.

References

  1. J. S. Lee and L. E. Miller, CDMA Systems Engineering Handbook, Boston, MA: Artech House, 1998.
  2. J. B. Anderson, T. Aulin and C. E. Sundberg, Digital Phase Modulation, New York: Plenum, 1986.
  3. M. A. Landolsi and W. E. Stark, "DS-CDMA chip waveform design for minimal interference under bandwidth, phase and envelope constraints", IEEE Trans. Commun., vol. 47, pp.  1737-1746, Nov.  1999.
  4. P. I. Dallas and F. N. Pavlidou, "Innovative chip waveforms in microcellular DS/CDMA packet mobile radio", IEEE Trans. Commun., vol. 44, pp.  1413-1416, Nov.  1996.
  5. T. F. Wong, T. M. Lok and J. S. Lehnert, "Asynchronous multiple-access interference suppression and chip waveform seletion with aperiodic random sequences", IEEE Trans. Commun., vol. 47, pp.  103-114, Jan.  1999.
  6. V. M. DaSilva and E. S. Sousa, "Multicarrier orthogonal CDMA signals for quasisynchronous communication systems", IEEE J. Select. Areas Commun., vol. 12, pp.  842-852, June  1994.
  7. R. Srinivasan, U. Mitra and R. L. Moses, "Design and analysis of receiver filters for multiple chip-rate DS-CDMA systems", IEEE J. Select. Areas Commun., vol. 17, pp.  2096-2109, Dec.  1999.
  8. D. Slepian and H. O. Pollak, "Prolate spheroidal wave functions, fourier analysis and uncertainty-I", Bell Syst. Tech. J., vol. 40, no. 1, pp.  43-64, Jan.  1961.
  9. T. Coleman, M. A. Branch and A. Grace, Optimization Toolbox, Natick, MA: The MathWorks, Inc, 1999.
  10. C. Flammer, Spheroidal Wave Functions, Stanford, CA: Stanford Univ. Press, 1957.
  11. A. J. Viterbi, CDMA: Principles of Spread Spectrum Communication, Reading, MA: Addison-Wesley, 1995 .
  12. J. G. Proakis, Digital Communications, 3rd ed.   New York: McGraw-Hill, 1995.
  13. H. Leib and S. Pasupathy, "Digital transmission performance of standard analog filters", IEEE Trans. Commun., vol. 40, pp.  42-50, Jan.  1992.
  14. T. Luo, "Interference suppression techniques in multi-rate CDMA communication systems", Ph.D. dissertation, Dept. Elect. Comput. Eng., Univ. Toronto, Canada, 2001 .
  15. A. M. Monk, M. Davis, L. B. Milstein and C. W. Helstrom, "A noise-whitening approach to multiple access noise rejection-Part I: theory and background", IEEE J. Select. Areas Commun., vol. 12, pp.  817-827, June  1994.