Sequence allocation and power control in CDMA systems

Transmitter adaptation in the form of power control has been applied in current CDMA systems. The goal of this project, we investigate the performance of power control schemes applicable to some multiuser receivers, such as the MMSE and decision-feedback receivers.

While power control is a vital part of adapting the transmitters, it does not exploit the full potential of transmitter adaptation. If the transmitted signals are chosen or adapted suitably, interference between different user signals can be minimized and hence the performance of the system improves. In this work, we consider transmitter adaptation in the form of adapting the spreading sequences as well as the powers of the users in a DS-CDMA system. Adaptive algorithms are developed to solve the optimization problem of choosing a set of signature sequences with minimum total power so that the SNR targets of the users are met. A variant of this optimization problem in a multicarrier setting is also investigated.

Sponsors: ONR and ORAU

Publications

  1. L. Gao and T. F. Wong, "Power Control and Spreading Sequence Allocation in a CDMA Forward Link," IEEE Transactions on Information Theory, vol. 50, no. 1, pp. 105-124, Jan. 2004.
  2. T. F. Wong and T. M. Lok , "Transmitter adaptation in multicode DS-CDMA Systems," IEEE Journal on Selected Areas in Communications, vol. 19, no. 1, pp. 69-82, Jan. 2001.
  3. T. M. Lok and T. F. Wong, "Transmitter and Receiver Optimization in Multicarrier CDMA Systems," IEEE Transactions on Communications, vol. 48, no. 7, pp. 1197-1207, July 2000.
  4. A. F. Almutairi, S. L. Miller, H. A. Latchman, and T. F. Wong, "Power Control Algorithm for MMSE Receiver Based CDMA Systems," IEEE Communications Letters, vol. 4, no. 11, pp. 346-348, Nov. 2000.
  5. L. Gao and T. F. Wong, "Sequence Optimization in CDMA Point-to-point Transmission with Multipath," in Proceedings of the IEEE Vehicular Technology Conference (VTC Fall'02), vol. 4, Vancouver, Canada, pp. 2303-2307, Sep. 2002.
  6. L. Gao and T. F. Wong, "Iterative Construction of Spreading Sequences in CDMA Forward Link," in Proceedings of the IEEE Vehicular Technology Conference (VTC Fall'02), vol. 1, Vancouver, Canada, pp. 515-519, Sep. 2002.
  7. Y. Liu and T. F. Wong, "Power control algorithms for MMSE receivers in CDMA systems," in Proceedings of the IEEE Vehicular Technology Conference (VTC Fall'02), vol. 3, pp. 1749-1753, Vancouver, Canada, Sep. 2002.
  8. L. Gao and T. F. Wong, "Joint transmitter-receiver adaptive forward-link DS-CDMA system," in Proceedings of the IEEE Global Telecommunications Conference (GLOBECOM '01), vol. 2, pp. 1297-1301, San Antonio, TX, Nov. 2001.
  9. L. Gao and T. F. Wong, "RLS-based adaptive multicode CDMA system," in Proceedings of the IEEE Wireless Communications and Networking Conference (WCNC '00), vol. 3, pp. 1506-1510, Chicago, IL, Sep. 2000.
  10. T. F. Wong and T. M. Lok, "Spreading sequence adaptation in multicode CDMA Systems," in Proceedings of the IEEE International Conference on Communications (ICC '00), vol. 3, pp. 1375-1379, New Orleans, LA, June 2000.
  11. A. F. Almutairi, H. A. Latchman, T. F. Wong, and S. L. Miller, "MMSE based fully distributed power control algorithm," in Proceedings of the IEEE Military Communications Conference (MILCOM '99), vol. 1, pp. 167-171, Atlantic City, NJ, Nov. 1999.
  12. T. M. Lok and T. F. Wong, "Transmitter and Receiver Optimization in MC-CDMA Systems," in Proceedings of the IEEE Wireless Communications and Networking Conference (WCNC '99), vol. 3, pp. 1567-1571, New Orleans, LA, Sep. 1999.

*Download these papers


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Last modified: 8/29/01