TD-SCDMA system base station radio-frequency digital long-drawn optical fiber transmitting method and apparatus

Abstract

This invention is fiber-optical transmission method for drawing far away the TD-SCDMA system base station radio-frequency digit. The radio-frequency signal receiver-transmitter in wireless base station and base band digital signal processing part in wireless base station are separated and drawn far away to antenna neighborhood. After digitizing the intermediate-frequency port of radio-frequency signal receiver-transmitter, the received and transmitted digital data stream signal, controlling or detecting digital signal and referenced clock signal are respectively modulated to corresponding light wavelength. After making the optical signals corresponded to each radio-frequency receiver-transmitter confluent, an optical fiber is used to up-transmitting and down-transmitting respectively. At the receiving end, the confluent signal is split in terms of wavelength. The split signals are demodulated to corresponding digital signals respectively. This invention also provides the radio-frequency signal receiver-transmitter and indoor base station interface card matching this transmission method.

Description

Technical field [0001] The present invention relates to a transmission method and corresponding device used in the third-generation mobile communication TD-SCDMA system after radio frequency digital extension of a base station, and in particular to a method using optical fiber transmission and a corresponding device. Background technique [0002] Chinese Patent Application No. 200510001653.2 provides a technology of "Intermediate Frequency Transmission Method and Intermediate Frequency Interface for Realizing Remote Radio Frequency of Base Station Equipment". After the base station radio frequency is digitally extended in the TD-SCDMA system, the analog intermediate frequency transmission technology is used in various wired and The wireless transmission means connects the remote radio frequency analog transceiver unit with the wireless base station. Among them, for multiple remote radio frequency analog transceiver units, a pair of transmission media can be used to realize the co...

AI Technical Summary

Problems solved by technology

However, the quality of the clock signal obtained in this way cannot meet the requirements of mobile communication.

Moreover, the disadvantage of using the SDH digital intermediate frequency transmission method is that the digital bandwidth generated after digital multiplexing is relatively large (nearly 10Gbps), resulting in high difficulty and high cost.

Therefore, it is mainly used for point-to-point connections at present, and it cannot solve the various connection methods required by actual engineering.

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