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A Retransmission Power Adjustment Scheme for Performance Enhancement in DS/SSMA ALOHA with Packet Combining

Seo Hanbyul    (School of Electrical Engineering, Seoul National University   ); Park Seongyong    (Samsung Electronics Co. Ltd.   ); Lee Byeong Gi    (School of Electrical Engineering, Seoul National University  );
  • 초록

    In this paper, we present a retransmission power adjustment (RPA) scheme for DS/SSMA ALOHA packet radio systems with packet combining. In the proposed RPA scheme, retransmission power is adjusted in such a way that the erroneously-received packet can be recovered with a minimized interference to other user packets. We analyze the performance of the system with the RPA by employing the equilibrium point analysis (EPA), and confirm that the results obtained from the EPA are very close to the simulation results in low power cases. Simulation results demonstrate that the RPA scheme brings forth performance gain in the throughput and the average delay while saving a significant amount of transmission power. We also investigate the stability of the system from the EPA results, and conclude that the system becomes stable as the offered load increases or the level of retransmission power decreases.


  • 주제어

    Direct-sequence spread-spectrum multiple access (DS/SSMA) .   equilibrium point analysis (EPA) .   hybrid automatic repeat request (HARQ) .   packet combining .   retransmission power adjustment.  

  • 참고문헌 (12)

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    11. ?A. Annamalai, R. S. C. Wong, and V. K. Bhargava, 'Throughput enhancement of a slotted DS-CDMA ALOHA with packet combining,' in Proc. IEEE Pacific Rim Conf. Communications, Computers and Signal processing, Aug. 1997, pp. 506-510 
    12. ?D. Tuninetti and G. Caire, 'The throughput of some wireless multiaccess systems,' IEEE Trans. Inform. Theory, vol. 48, pp. 2773-2785, Oct. 2002 

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