Skip to main content


Subcarrier Group Assignment for MC-CDMA Wireless Networks

Article metrics

  • 852 Accesses

  • 5 Citations


Two interference-based subcarrier group assignment strategies in dynamic resource allocation are proposed for MC-CDMA wireless systems to achieve high throughput in a multicell environment. Least interfered group assignment (LIGA) selects for each session the subcarrier group on which the user receives the minimum interference, while best channel ratio group assignment (BCRGA) chooses the subcarrier group with the largest channel response-to-interference ratio. Both analytical framework and simulation model are developed for evaluation of throughput distribution of the proposed schemes. An iterative approach is devised to handle the complex interdependency between multicell interference profiles in the throughput analysis. Illustrative results show significant throughput improvement offered by the interference-based assignment schemes for MC-CDMA multicell wireless systems. In particular, under low loading conditions, LIGA renders the best performance. However, as the load increases BCRGA tends to offer superior performance.



  1. 1.

    Yee N, Linnartz J-P, Fettweis G: Multi-Carrier-CDMA in indoor wireless networks. Proceedings of IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC '93), September 1993, Yokohama, Japan 109-113.

  2. 2.

    Tabulo M, Laurenson D, McLaughlin S, Al-Susa E: A linear programming algorithm for a grouped MC-CDMA system. Proceedings of the 58th IEEE Vehicular Technology Conference (VTC '03), October 2003, Orlando, Fla, USA 3: 1463-1467.

  3. 3.

    Van Nee R, Prasad R: OFDM for Wireless Multimedia Communications. Artech House Publishers, Norwood, Mass, USA; 2000.

  4. 4.

    Cai X, Zhou S, Giannakis GB: Group-orthogonal multicarrier CDMA. IEEE Transactions on Communications 2004,52(1):90-99. 10.1109/TCOMM.2003.822174

  5. 5.

    Chuxiang L, Xiaodong W: Adaptive subchannel allocation in multiuser MC-CDMA systems. Proceedings of IEEE Global Telecommunications Conference (GLOBECOM '04), November-December 2004, Dallas, Tex, USA 4: 2503-2507.

  6. 6.

    Sampath PK, Cam H, Natarajan A: Power and subcarrier allocation for multirate MC-CDMA system. Proceedings of the 58th IEEE Vehicular Technology Conference (VTC '03), October 2004, Orlando, Fla, USA 3: 1900-1902.

  7. 7.

    Lee YH, Bar-Ness Y: Transmission power adaptations in MC-CDMA communications over Rayleigh fading channels. Proceedings of IEEE Wireless Communications and Networking Conference (WCNC '04), March 2004, Atlanta, Ga, USA 3: 1589-1594.

  8. 8.

    Nunes M, Santos J, Rodrigues A, Punt J, Nikokaar H, Prasad R: Effects of downlink intercell interference on MC-CDMA system performance. Proceedings of the 9th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC '98), September 1998, Boston, Mass, USA 3: 1050-1054.

  9. 9.

    Debbah M: Capacity of a downlink MC-CDMA multi-cell network. Proceedings of IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP '04), May 2004, Montreal, Que, Canada 4: 761-764.

  10. 10.

    Gilhousen KS, Jacobs IM, Padovani R, Viterbi AJ, Weaver LA Jr., Wheatley CE III: On the capacity of a cellular CDMA system. IEEE Transactions on Vehicular Technology 1991,40(2):303-312. 10.1109/25.289411

  11. 11.

    Evans JS, Everitt D: On the teletraffic capacity of CDMA cellular networks. IEEE Transactions on Vehicular Technology 1999,48(1):153-165. 10.1109/25.740079

  12. 12.

    Kim DK, Sung DK: Capacity estimation for an SIR-based power-controlled CDMA system supporting ON-OFF traffic. IEEE Transactions on Vehicular Technology 2000,49(4):1094-1101. 10.1109/25.875216

  13. 13.

    Gallager R: Information Theory and Reliable Communications. John Wiley & Sons, New York, NY, USA; 1968.

  14. 14.

    Baum KL, Kostas TA, Sartori PJ, Classon BK: Performance characteristics of cellular systems with different link adaptation strategies. IEEE Transactions on Vehicular Technology 2003,52(6):1497-1507. 10.1109/TVT.2003.819445

  15. 15.

    Lai J, Mandayam NB: Minimum duration outages in Rayleigh fading channels. IEEE Transactions on Communications 2001,49(10):1755-1761. 10.1109/26.957397

  16. 16.

    Qiu X, Chawla K: On the performance of adaptive modulation in cellular systems. IEEE Transactions on Communications 1999,47(6):884-895. 10.1109/26.771345

  17. 17.

    Kaiser S: OFDM-CDMA versus DS-CDMA: performance evaluation for fading channels. Proceedings of the IEEE International Conference on Communications (ICC '95), June 1995, Seattle, Wash, USA 3: 1722-1726.

  18. 18.

    Rappaport T: Wireless Communications: Principle and Practice. 2nd edition. Prentice-Hall, Upper Saddle River, NJ, USA; 2001.

Download references

Author information

Correspondence to Tallal El Shabrawy.

Rights and permissions

Open Access This article is distributed under the terms of the Creative Commons Attribution 2.0 International License (, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Reprints and Permissions

About this article


  • Group Assignment
  • Assignment Scheme
  • Dynamic Resource
  • Large Channel
  • Minimum Interference