Long term evolution-interference cancellation system (LTE-ICS) and method

Abstract

The invention discloses a long term evolution-interference cancellation system (LTE-ICS) and method. The system comprises an analog-digital conversion (ADC) module, a first complex frequency mixing processing unit, a direct digital control (DDC) module, an interference cancellation system (ICS) echo self-cancellation module, a digital up conversion (DUC) module, a second complex frequency mixing processing unit and a digital-analog conversion (DAC) module, which are sequentially connected with one another; and the system is characterized in that the ICS echo self-cancellation module comprises a first accumulator unit, a gain control unit, a delay unit, an XCORR module, a least mean square (LMS) module and a second accumulator unit; the input end of the first accumulator unit is connected to the output end of the DDC module and the output end of the second accumulator unit, and the output end of the first accumulator unit is connected to the input end of the gain control unit; the output end of the gain control unit is connected with the input end of the XCORR module and the input end of the delay unit; and the output end of the delay unit is connected to the input end of the XCORR module and the input end of the LMS module, the output end of the XCORR module is connected to the input end of the LMS module, and the output end of the LMS module is connected to the input end of the second accumulator unit. The system and the method are used for the self cancellation of the interference of a LTE wireless co-channel repeater.

Description

technical field [0001] The invention belongs to the field of radio transmission, and relates to a fourth-generation mobile communication system (4G) LTE wireless co-frequency repeater, in particular to an interference self-elimination system and method applied to an LTE wireless co-frequency repeater. Background technique [0002] With the rapid development of my country's mobile communication industry and the continuous increase in research and development of the fourth-generation mobile communication system (4G), the number of mobile communication users is increasing, so that the cellular planning is getting smaller and smaller, and the location of the base station is getting lower and lower; The repeater is an extremely effective device used to make up for the lack of coverage of the base station in the mobile network, expand the coverage of the base station, and fill in the blind area of ​​coverage. [0003] Among them, the LTE wireless same-frequency repeater, as a commo...

AI Technical Summary

Problems solved by technology

In a conventional LTE wireless same-frequency repeater, for TDD mode or FDD mode, the donor antenna will inevitably receive signals from the retransmission antenna under the condition of limited isolation, and these signals are reflected back to the donor through multipath After the antenna, it will cause interference to the work of the repeater and affect the quality of the waveform. When the feedback signal is greater than the original input signal, it will cause the repeater to self-excite. In serious cases, the repeater system will collapse or even burn out the power amplifier. ; Since the frequency of the echo signal is the working frequency of the repeater itself, this kind of interference cannot be processed in the frequency domain by conventional filtering

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