Method and device for suppressing noise floor signal rise
A signal and digital signal technology, applied in the transmitter/receiver for shaping network, line failure/interference reduction, baseband system components, etc. Accumulation and other problems, to achieve the effect of less computation, reduced delay, and improved operating efficiency
Active Publication Date: 2017-04-12
SHENZHEN GRENTECH RF COMM LTD
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Problems solved by technology
[0005] The addition of the repeater can really improve the network coverage and expand the network coverage. However, due to the cascading use of multi-level equipment, the accumulation of the system floor noise results in an increase in the floor noise.
Excessively high noise floor will reduce the receiving sensitivity of the base station, and make the uplink and downlink signals in the coverage area seriously unbalanced, and problems such as call drop will occur during the communication process
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[0033] The present invention will be described below in conjunction with the drawings. It should be appreciated that the method and application scenarios of the present invention for suppressing the rise of noise floor signals are not limited to repeaters and room distribution systems.
[0034] refer to figure 1 , in the downlink, the radio frequency signal coupled from the base station or from the remote radio unit (RRU) becomes a digital signal after being processed by the first down-conversion module 10 and the first analog-to-digital converter 11, and the digital signal undergoes signal processing After the digital down-converter 121 in unit 12 completes splitting, half-band filtering, extraction, and low-noise suppression, the digital up-converter 131 in the signal processing unit 13 completes interpolation, half-band filtering, and frequency synthesis to restore the spectrum structure Afterwards, it is converted into an analog signal in the first digital-to-analog conve...
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The invention relates to a method and a device for restraining ground noise signal in a broadband system from upraising. The method comprises the following steps: performing frequency mixing on a radio frequency signal from a mobile terminal or a base station and DDC (Digital Down Convertor) on a digital signal after analog-to-digital conversion, namely, moving central frequency of the digital signal to zero intermediate frequency, dividing a signal of the zero intermediate frequency into two branches, performing first half-band filtration on the two branches, and performing N-time extraction filtration on a signal after the first half-band filtration; performing ground noise restraining processing on a signal after N-time extraction filtration; performing DUC (Digital Up Convertor) processing on a signal after the ground noise restraining processing, namely, performing N-time interpolation filtration on the signal after N-time extraction filtration, performing second half-band filtration on a signal after N-time interpolation filtration, mixing and combining the frequency of the signal after the second half-band filtration, and recovering a frequency spectrum structure of a combiner signal. By adopting the method and the device, the network quality is improved, the system time delay is reduced, and the system efficiency is improved.
Description
[0001] 【Technical field】 [0002] The present invention relates to the technical field of communications, and more specifically, to a method for suppressing the rise of noise floor signals and a device applying the method. The method for suppressing the rise of noise floor signals is especially suitable for broadband systems. [0003] 【Background technique】 [0004] Wireless network coverage is an important part of network construction. With the diversification of coverage environments, traditional base station coverage can no longer meet the needs of modern network construction. In order to expand the coverage of the base station and enhance the coverage effect of the base station, operators introduce repeaters in the wireless coverage environment. The repeater is generally composed of an access end and a remote end, which can directly couple the radio frequency signal of the base station end, use network cables, optical fibers, etc. to complete the signal transmission, and c...
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IPC IPC(8): H04L25/03H04L25/08
Inventor 徐雅静孔明明周国勇
Owner SHENZHEN GRENTECH RF COMM LTD