The Effects of Rain Attenuation in a Quasi-Synchronous CDMA Return Link for a Ka-Band Satellite Communication System(Special Section of Fundamentals of Multi-dimensional Mobile Information Network)

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概要

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• Future satellite communication systems will be developed at Ka-band(20/30GHz)owing to the relatively wide frequency allocation and current freedom from terrestrial interference for multimedia services. A serious disadvantage of the Ka-band, however, is the very high atmospheric attenuation in rainy weather. Quasi-synchronous CDMA drastically reduces the effect of self-noise with several interesting features of CDMA for mobile communications such as flexible frequency reuse, the capability of performing soft-handover and a lower sensitivity to interference. This paper evaluates the performance of a quasi-synchronous CDMA return link for a Ka-band geostationary satellite communication system. For a fixed satellite channel whose characteristics depend on weather conditions, the signal envelope and phase for this channel is modeled as Gaussian. The bit error and outage probability, and the detection loss due to imperfect chip timing synchronization is analytically evaluated and the system capacity degradation due to the weather condition is estimated. Two cases of general and worst conditions are evaluated, in which i)rain attenuation ii)nonlinearity of transponder are considered. The two cases consist of the general case in which all users are affected by rainy weather, and the worst case in which only the user of interest, not multiple access interferers, is affected by rain attenuation. The results for the two cases of rainy weather clealry show that quasi-synchronous CDMA eases the power control requirements and has less sensitivity to imperfect power control. When dealing with the impact of the satellite transponder nonlinearity in addition to the rain attenuation, the shift of optimum amplifier operating point is shown so that[E_b/N_o]_<sat>, defined as the sum of the E_b/N_o value required to obtain a BER equal to P_b at a given output backoff(OBO) and the value of the OBO itself, tends to decrease, and higher BER impairment is given, since the rain attenuation results in the same effect as the additive input backoff(IBO) at the satellite transponder input. As the BER increases, the optimum [E_b/N_o]_<sat> and IBO decrease that result in the shift of optimum operating point.

• 社団法人電子情報通信学会の論文
• 1998-07-25

著者

• Whang K‐c

  Yonsei Univ. Seoul Kor

• Kim T‐j

  Electronics And Telecommunications Res. Inst. Daejon Kor

• Hwang Seung-hoon

  Department Of Electronics Engineering Dongguk University-seoul

• Hwang Seung-hoon

  Department Of Electronic Engineering Dongguk University

• WHANG Keum-Chan

  Department of Electrical and Electronic Engineering, Yonsei University

• AHN Jae-Young

  Electronics and Telecommunications Research Institute

• KIM Tae-Joong

  Electronics and Telecommunications Research Institute

• Whang Keum-chan

  Communication System Lab. Department Of Electrical And Electronic Engineering Yonsei University

• Whang Keum-chan

  The Department Of Electrical And Electronic Engineering Yonsei University

• Whang Keum-chan

  Department Of Electrical & Computer Engineering Yonsei University

• Whang Keum-chan

  The Department Of Electrical Engineering Yonsei University

• HWANG Seung-Hoon

  Department of Electrical Engineering, Yonsei University

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