【摘 要】
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Under the indoor environment,since the attenuation of signal intensity of the mobile phone caused by traversing multiple building walls,the signal strength that the receiver captured is pretty weak.Un
【机 构】
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School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing,China
论文部分内容阅读
Under the indoor environment,since the attenuation of signal intensity of the mobile phone caused by traversing multiple building walls,the signal strength that the receiver captured is pretty weak.Unfortunately,the existing indoor passive location receivers based on CDMA cant capture that weak signal under such circumstances,hence it is urgent to propose a reasonable acquisition method to solve this problem.This paper starts from the existing signalcapture methods based on CDMA communication system,by studying all the uplink channels in this system that are suitable for indoor passive location,finds that RACH (Random Access Channel) signal not only has large transmission power and a sudden strong signal,and very suitable for indoor passive location of signalacquisition [1].However,the existing signal acquisition method in CDMA sys-tem is not suitable for RACH signal acquisition.This paper redesigns the local code generator and the acquisition process,and finally achieved the weak signal acquisition in CDMA system.Experimental results show that this method can not only improve the signal to noise ratio of weak signal acquisition decision,but also has a great reference value for post disaster rescue and rescue detection station research based on CDMA mobile phone.
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