Performance Analysis of Fiber-Optic Millimeter-Wave Band Radio Subscriber Loop

Hiroshi HARADA  Hee-Jin LEE  Shozo KOMAKI  Norihiko MORINAGA  

IEICE TRANSACTIONS on Communications   Vol.E76-B    No.9    pp.1128-1135
Publication Date: 1993/09/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Fiber-optic Microcelluler Radio Communication System and Their Technologies)
Category: System and Network Matters
optimum modulation,  available capacity,  rainfall attenuation,  AGC,  millimeter-wave band radio subscriber loop,  

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This paper proposes a new subscriber distribution method called FTTA (Fiber To The Area), which uses millimeter-wave radio band to connect subscribers with base station and optical fiber to connect base station with control station in order to obtain broad-band transmission. Usually two main causes of signal degradation, i.e., rainfall attenuation on radio channel and intermodulation distortion on optical channel are considered in this system. Taking into considerations of these two factors, we analyze the available capacity of FTTA system for various 22nQAM modulation levels. The analysis clarifies that there exists an optimum modulation level that can maxize the available capacity, and AGC circuit in the base station is useful to compensate the rainfall attenuation. It is shown that 18.0Gbps is available under the optimum modulation method of the 64QAM with AGC and 12.0Gbps under the 16QAM without AGC when 20 carriers are used.