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Downlink power control in multi-code CDMA for mobile medicine

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Abstract

In this paper, we propose a downlink power-control mechanism to be applied in a multi-code code division multiple access (CDMA) mobile medicine system. The mobile medicine system can provide (i) measured blood pressure and body temperature, (ii) medical signals measured by the electrocardiogram (ECG) device, (iii) mobile patient’s history, (iv) G.729 audio signals, (v) Joint Photographic Experts Group 2000 Medical images and Moving Picture Experts Group 4 charge-coupled device sensor video signals. By utilizing a multi-code CDMA spread spectrum communication system with downlink power-control strategy, it is possible for this system to meet the quality of service requirements of a mobile medicine network. In addition, such a system can maximize the resource utilization. For different messages to be sent, the power is controlled according to the requisite bit error rate (BER). Higher transmission power is given to the media with lower BER requirement. Numerical analysis shows that the ratios of transmission power for voice, video, and data virtual channels is approximately 1:2:13 when the BERs for voice, video, and data are 10∧(− 3), 10∧(− 4), and 10∧(− 7), respectively. This power ratio is similar to the ratio of signal-to-noise plus interference power ratio for voice, video, and data during transmission. For the purpose of verifying the proposed argument, a simulation has been done and the results match the derivation very well.

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Acknowledgments

The authors acknowledge the support of the grant from the National science Council of Taiwan NSC 93-2218-E-019-024 as well as 93-2219-E-009-009 and the valuable comments of the reviewers.

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Authors and Affiliations

  1. Department of Electrical Engineering, National Taiwan-Ocean University, Pei-Ning Road, Keelung, Taiwan, 202-24, ROC

    Chin-Feng Lin, Hsin-Wang Lee & Shih-Ii Hung

  2. Department of Communication Engineering, National Chiao-Tung University, Ta Hsueh Road, Hsinchu, 300, Taiwan, ROC

    Wen-Thong Chang

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  1. Chin-Feng Lin
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  2. Wen-Thong Chang
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Correspondence to Chin-Feng Lin.

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Lin, CF., Chang, WT., Lee, HW. et al. Downlink power control in multi-code CDMA for mobile medicine. Med Bio Eng Comput 44, 437–444 (2006). https://doi.org/10.1007/s11517-006-0058-9

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  • DOI: https://doi.org/10.1007/s11517-006-0058-9

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