ISSN : 1796-2021
Volume : 3    Issue : 5    Date : October 2008

Man-Made Noise Evaluation for Cryogenic Receiver Front-End
Shoichi Narahashi, Kei Satoh, Yasunori Suzuki, Tetsuya Mimura, and Toshio Nojima
Page(s): 54-61
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This paper presents measured results of manmade noise impact on an cryogenic receiver
front-end (CRFE) in urban and suburban areas in the 2-GHz band with amplitude probability
distribution (APD). The CRFE comprises a high-temperature superconducting filter,
cryogenically-cooled low-noise amplifier, and highly-reliable cryostat. The CRFE is expected to be
an effective and practical approach to attain efficient frequency utilization and to improve the
sensitivity of mobile base station receivers. It is important to measure the characteristics of
man-made noise in typical cellular base station antenna environments and confirm their impact on
the CRFE reception with APD because if man-made noise has a stronger effect than thermal noise,
the CRFE would fail to offer any improvement in sensitivity. The measured results suggest that the
contribution of man-made noise in the 2-GHz band can be ignored as far as Wideband Code
Division Multiple Access (W-CDMA) system is concerned. The manmade noise is also measured in
the VHF-band for comparison with the 2-GHz band environment.

Index Terms
cryogenic receiver front-end, man-made noise, amplitude probability distribution, wideband code
division multiple access