Signal transmission system and signal transmission method

Abstract

The embodiment of the invention provides a signal transmission system and method, and relates to the field of communication. The signal transmission system comprises a main unit device, a far-end frequency conversion device and a coaxial network. The main unit device is used for carrying out up-conversion processing on each channel signal in the multi-channel digital baseband signals and carryingout combination processing on the processed multi-channel intermediate frequency signals with different frequencies to obtain a first combined intermediate frequency signal. The coaxial network is used for transmitting the first combined intermediate frequency signal to far-end frequency conversion equipment. The far-end frequency conversion device is used for carrying out branching processing onthe received first combined intermediate frequency signals, carrying out up-conversion processing on each path of branched intermediate frequency signals to obtain radio frequency signals with carrierfrequency specified by an operator, and sending the multiple paths of radio frequency signals through an antenna. Similarly, the processing process is opposite to the signal receiving direction. According to the signal transmission system, a frequency division multiplexing mode is adopted, and the MIMO function can be supported under the condition that an existing coaxial network does not need tobe upgraded.

Description

technical field [0001] The present application relates to the technical field of communications, and in particular, to a signal transmission system and a signal transmission method. Background technique [0002] When communication operators (such as China Mobile, China Unicom or China Telecom) build wireless access networks, in addition to considering deploying macro base stations outdoors in the form of cellular, they also need to consider indoor (such as office buildings, residences, shopping malls, hospitals, schools and gymnasiums) etc.) signal coverage issues. Unlike open outdoor venues, due to the presence of various occlusions and reflectors indoors, antennas often need to be densely deployed indoors to achieve indoor signal coverage without dead spots. However, if each antenna is equipped with a base station device, the entire project cost will be too expensive. In order to reduce the cost of indoor coverage deployment, a distributed antenna system (DAS) emerges as ...

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Problems solved by technology

[0004] However, with the increase of carrier frequency (such as 5G signal), this traditional DAS indoor distribution solution has the following defects: the original devices of the coaxial network generally do not support new frequency bands, and when the carrier frequency increases, it is necessary to update the original It is difficult for the current DAS system to support the MIMO (Multiple-Input Multiple-Output) function between the base station and the mobile terminal. For example, when transmitting the signal of the 2T2R base station, it is necessary to add another set of coaxial network

However, these solutions all abandon the transmission medium of the original coaxial network, and the replacement of the transmission medium will bring huge time and money costs

[0006] In addition, the prices of the near-end and remote devices of these alternatives are relatively expensive, which will further increase the difficulty of deploying wireless communication systems (such as 5G communication systems)

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