Hybrid digital radio-relay system
申请(专利)号： EP19930308038
专利号： EP0597588A2 主分类号： H04B7/155 申请权利人： NIPPON
TELEGRAPH AND TELEPHONE CORPORATION 公开国代码： EP 优先权国家： JP
摘 要：
In a digital radio-relay system having a transmitting terminal station (10), at least one repeater station (100), and a
receiving terminal station (50), a repeater station (100) is a non-regenerative repeater station which does not
regenerate a digital signal in order to simplify and reduce cost of the system, while keeping excellent signal quality in transmission. Each repeater station has a plurality of sub-units relating to respective sub-system signals each having a plurality of carriers (A, B, C) so that
frequency spectrum of each sub-system signal is allocated on frequency axis based upon frequency division multiplex system. A repeater station (50) having a first frequency converter (112) to convert received radio frequency to IF frequency, bandpass filters (132) for deriving one of carriers (A, B, C) in each sub-system signal, amplifiers (134) to amplify thus derived carrier (A, B, C) on IF band stage,
申请日： 1993-10-08 公开公告日： 1994-05-18
分类号： H04B7/155 发明设计人： KAGAMI, OSAMU;
MORITA, KOZO; WANANABE, KAZUJI 申请国代码： EP
优先权： 19921009 JP
296662/92; 19921009 JP 296661/92
摘 要 附 图：
and a second frequency converter (138) to convert the IF frequency to radio frequency, has a common reference
oscillator (104) which generates reference frequency which is common divisor of all the local frequencies for all the radio
frequencies of all the sub-system signals, and, only one of upper heterodyne signals and lower heterodyne signals are taken in all the frequency conversions, so that distortion in each relay section is added in-phase, and that leaked noise (A', B', C') caused by said bandpass filters is added to original carrier (A, B, C) in-phase. All the distortion thus added in the relay sections can be compensated by a
transversal equalizer (65) in the receiving terminal station. Therefore, excellent signal quality is obtained although a
simple non-regenerative repeater station is used. 主权项：
(1) A hybrid digital radio-relay system comprising; ???a transmitting terminal sta
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Hybrid digital radio-relay system
