Adaptive ARQ protocols for CDMA packet radio networks

The main objective of this research is to design data-link layer protocols, which can adjust to different channel conditions adaptively, for DS-CDMA packet radio networks. The type-II hybrid ARQ protocol is suggested as a good compromise between system performance and complexity. The system performance and stability of a slotted DS-CDMA network employing the type-II hybrid ARQ protocol are studied in detail.

The power efficiency of a CDMA link can be significantly enhanced by optimally selecting the set of spreading sequences employed under the constraint that a prescribed level of SNR performance is achieved. We propose a type-I hybrid ARQ protocol which makes use of the optimally selected spreading sequences in the physical layer to allow simultaneous transmission of multiple packets over a CDMA link. With a proper resource allocation scheme, the proposed type-I hybrid ARQ protocol provides significant improvement on the link throughput.

Sponsors: ONR and SCEEE

Publications

  1. Q. Zhang, T. F. Wong, and J. S. Lehnert, "Performance of a Type-II Hybrid ARQ Protocol in Slotted DS-SSMA Packet Radio Systems," IEEE Transactions on Communications, vol 47, no. 2, pp. 281-290, Feb. 1999.
  2. Q. Zhang, T. F. Wong, and J. S. Lehnert, "Buffered Type-II Hybrid ARQ Protocol for Slotted DS-SSMA Packet Radio Systems," International Journal of Wireless Information Networks, vol. 5, no. 3, pp. 203-217, July 1998.
  3. T. F. Wong, L. Gao, and T. M. Lok, "A type-I hybrid ARQ protocol over optimal-sequence CDMA link," in Proceedings of the IEEE Military Communications Conference (MILCOM '00), vol. 2, pp. 559-563, Los Angeles, CA, Oct. 2000.
  4. S. Subramanian and T. F. Wong, "Transmission scheduling scheme for multirate multicode CDMA networks," in Proceedings of the IEEE Military Communications Conference (MILCOM '99), vol. 1, pp. 403-407, Atlantic City, NJ, Nov. 1999.
  5. Q. Zhang, T. F. Wong, and J. S. Lehnert, "Stability of a Type-II Hybrid ARQ Protocol for Slotted DS-SSMA Packet Radio Systems,"in Proceedings of the IEEE Conference on Computer Communications (INFOCOM '98), vol. 3, pp. 1301-1308, San Francisco, CA, Apr. 1998.
  6. Q. Zhang, T. F. Wong, and J. S. Lehnert, "Adaptive Coding for Slotted DS-SSMA Packet Radio Systems," in Proceedings of the IEEE Military Communications Conference (MILCOM '97), vol. 1, pp. 291-295, Monterey, CA, Nov. 1997.

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Last modified: 8/29/01