Compared with the traditional RF and IF pulls distant technology the baseband optical pulls distant technology has some obvious superiority,especially in feeder line processing and choice of station site it has become the main pulls distant technology in 3G network such as TD SCDMA.Refering to the baseband optical pulls distant technology in 3G network the paper proposes a scheme which is suitable for the digital microwave relay system.The design uses high performance Gigabit chip 88E1111 and 1.25G optical transceiver SSFF3151 to compelete the baseband interface.The signal transmits to the remote through the digital fiber and restores the radio frequency signal.This paper introduces 88E1111 s principle performance interface the hardware circuit design principles as well as part of the concrete implementation and schematic diagrams.The scheme satisfies the baseband transmision in the stability and the error rate aspect.It can be used in kinds of digital microwave relay systems.

Baseband optical based on Gigabit.pdf

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