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 a corresponding device used after the base station radio frequency is digitally remoted in the third-generation mobile communication TD-SCDMA system, specifically a method using optical fiber transmission and a corresponding device. Background technique [0002] Chinese patent application number 200510001653.2 provides a technology of "IF transmission method and IF interface for base station equipment to realize remote radio frequency". Wireless transmission means connect the remote radio frequency analog transceiver unit to the wireless base station. Among them, multiple remote radio frequency analog transceiver units can use a pair of transmission media to realize various connection methods including star, chain and ring. In this method, the base station modulates the analog intermediate frequency signal between each radio frequency transceiver at an intermediate frequency carrier frequency,...

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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