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PIERS Online
Vol. 3
No. 8
2007
pp: 1298-1302Research on Asymmetric Characteristics of Mobile Communications System Based on Electromagnetic RadiationWeidong Wang, Yinghai Zhang, Kaijie Zhou, and Heng Zhang doi:10.2529/PIERS070320050317 Downloads: 1474 Abstract:It's well known that data traffic brings asymmetry which is called Service Asymmetry (SA) to mobile communications system. This paper discusses asymmetry between uplink and downlink in mobile communications system in a new aspect --- in view of the effects of electromagnetic radiation to human body, which is termed as Electromagnetic Asymmetry (EA). It's stated that both EA and SA should be taken into account, but EA has higher priority to SA. By calculating, it's concluded that under the restriction of electromagnetic radiation, the downlink data rate should be much higher than that of uplink. It is demonstrated that to adapt to EA and SA, the equivalent bandwidth of uplink should be narrower than that of downlink in view of duplex techniques including FDD and TDD.References:1. Holma, H. and A. Toskala, WCDMA for UMTS-Radio Access for Third Generation Mobile Communications, John Wiley & Sons, Ltd., 2000. 2. Povey, G. J. R., "A review of time division duplex-CDMA techniques [C]," 1998 IEEE 5th International Symposium on Spread Spectrum Techniques and Applications, 1998. 3. Stevens, P., "Operator design and planning issues for UMTS networks," UMTS --- The R&D Challenges (Ref. No. 1998/496), IEE Colloquium, 3/1-3/5, 23 Nov., 1998. 4. Esmailzadeh, R. and M. Nkagawa, TDD-CDMA for Wireless Communications, Artech House, 2002. 5. Liu, Y., Electromagnetic Biology Effect, Beijing University of Posts and Telecommunications, Jan., 2002. 6. Sun, Z., P. Liu, and Z. Qing "FDTD analysis on influence of electromagnetic radiation of mobile communication terminal to human body,". Shantou University bulletin 7. Kang, G., X. Zhu, and C. Wang "Electromagnetic dose analysis of monopole mobile phone acting on human body,". Beijing University bulletin |
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