Design And Application Of WCDMA ICS PICO Repeater

The repeater is mainly directed against complement base station system can not cover the area coverage, because of its low cost, simple installation,essential in the mobile communication network optimization, and the miniature repeater is used in small and medium-sized regional weak signal and blind area of indoor cellular coverage system (also called vertex cover) equipment, is asignal enhancer. It does not interfere with the indoor base station, is a small area of very effective coverage solution.The wireless repeater self excitation problem station has always been the weak point of Engineering application. Because the donor antenna and there transmission antenna installation location problems often result in isolation is not the problem, if installed properly, will cause serious damage to the repeater, even burning power tube.This topic is combined with my work experience, the repeater equipment design a paragraph can improve this problem, the system with interference cancellation(Interference Cancellation System) function of the ICS repeater, provides to high-speed development of the chip industry for the realization of ICS technology. This paper presents a novel ICS micro repeater scheme, this scheme mainly through the coupling signal end of the antenna output after processed by the chip after the corresponding feedback to the input signal channel, forming interference cancellation loop, so as to achieve the purpose of interference cancellation. In addition, when the offset capability of the proposed scheme cannot meet current environmental requirements, ensure the equipment running without self state by automatically adjusting the uplink and downlink gain.This paper first introduces the purpose of the thesis research background and research, ICS leads from the repeater repeater, and the new ICS techniques are analyzed and discussed comprehensively. Then the design and production of the overall design, key device selection, schematic design and PCB board of the new program. Through the debugging and testing of the indicators of circuit board, verify the theoretical analysis is to offset the effect of expectations, we can know from the experimental results, can improve the isolation between antennas to 15-20dB, and in the laboratory through building simulation environment, to test the ICS micro repeater self excitation conditions in actual interference cancellation effect, can meet the experimental test results. Finally analyzes the offset effect of the equipment used in the actual network, can effectively solve the repeater station in engineering application isolation is not difficult, antenna erection problems. Finally, an application scenario of ICS micro repeater, and applied to the signal has high traffic area signal coverage and blind supplement.