Method and system for transmitting GSM/TD-SCDMA signals by cat5
A TD-SCDMA, Category 5 line technology, applied in transmission systems, wireless communications, electrical components, etc., can solve the problem of limited working bandwidth of Category 5 lines, and achieve the effect of reducing system complexity and cost
Active Publication Date: 2015-07-15
CHINA YOUKE COMM TECH
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[0002] Category 5 line-to-home products use the user's original network cable to achieve mobile signal home coverage, which has been recognized by operators. China Mobile is the largest operator in China, and it also operates 2G GSM network and 3G TD-SCDMA network. Therefore, It is required to transmit GSM signal and TD-SCDMA signal at the same time in a set of Category 5 line equipment, but 1 / 2 / 3 / 6 four cores of the user's network cable have been used to transmit Ethernet signals, and only 4 / 5 / 7 / 8 four cores
It is required to transmit GSM and TD-SCDMA signals in the same pair of wire cores, and frequency division multiplexing must be used. However, due to the limited working bandwidth of the five types of lines, the working frequency is limited between 0 and 100MHz, while the upper and lower GSM Uplink signals need to occupy 2*19MHz frequency resources, and TD-SCDMA uplink and downlink signals also need to occupy 2*15MHz frequency resources. There is no sufficient frequency guard interval to ensure the safe coexistence of the two systems, so signal processing is required to ensure The device works normally
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[0021] This embodiment provides a method for transmitting GSM / TD-SCDMA signals using Category 5 lines. The method is to use baseband synchronization in the near-end unit of Category 5 lines to realize the synchronization of input TD-SCDMA signals, and then control the RF switch. Switching sequence, the uplink and downlink time slot signals of TD-SCDMA are respectively sent to two different radio frequency links for modulation, and then transmitted to the remote unit of the category 5 line through the network cable, and then demodulated by the remote unit of the category 5 line The frequency is restored to the TD-SCDMA radio frequency signal of the same frequency by circuit up-conversion; at the same time, this method uses the analog companding and despreading technology to compress the GSM signal with a bandwidth of 19MHz to a frequency range of 3MHz and transmit it in the network cable. Then despread and restore to 19MHz.
[0022] In order to allow those skilled in the art to...
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The invention relates to a method and a system for transmitting GSM / TD-SCDMA dual-module mobile signals by cat5, wherein the TD-SCDMA signal chain converts the time division TD-SCDMA signals into frequency division signals by base band synchronous circuit and modulating circuit, and then transmits the uplink and downlink signals of the TD-SCDMA by different middle frequencies; meanwhile, the method and system utilizes companding technology, which reduces occupied bandwidth of the GSM signals, restrains the frequency domain interference between the GSM signals and TD-SCDMA signals and realizes the safe share of the dual-module signals of the GSM signals and the TD-SCDMA signals.
Description
technical field [0001] The invention relates to the technical field of wireless communication, in particular to a method and system for transmitting GSM / TD-SCDMA dual-mode mobile signals by using Category 5 lines. Background technique [0002] Category 5 line-to-home products use the user's original network cable to achieve mobile signal home coverage, which has been recognized by operators. China Mobile is the largest operator in China, and it also operates 2G GSM network and 3G TD-SCDMA network. Therefore, It is required to transmit GSM signal and TD-SCDMA signal at the same time in a set of Category 5 line equipment, but 1 / 2 / 3 / 6 four cores of the user's network cable have been used to transmit Ethernet signals, and only 4 / 5 / 7 / 8 four cores. According to the operator's requirement that active equipment must be traceable and controllable, 4 / 5 two cores are used to transmit RS485 monitoring signals, and only 7 / 8 two cores are left, and GSM and TD must be transmitted at the ...
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IPC IPC(8): H04W16/20H04B1/7073
Inventor 赖克中张健荣陈群峰谭金生江秀清
Owner CHINA YOUKE COMM TECH