Simulation And Model Analysis About The Human Body Effect In CDMA Indoor Distributed System

CDMA indoor distribution system is the main signal cover solutionto solve indoor coverage and divert talking load. Indoor system adoptssmall-power antennas to achieve space coverage. Due to building loss,user body effects and moving influence, the downlink signal in CDMAindoor system exist significant fading. There exist several issues to bedetailed analyzed regarding human body effect in commercial network.This paper is based on the common indoor system transmissionmodel. By designing a scenario simulating actual user telecommunicating,this paper measures the received power of the cell phone under the indoorsystem on different stationary position with and without human bodyinfluence. By processing the received data, we can fit the test data intospecific model such as ITU-R.P1238and K-M model, which confirmsthe effectiveness of the experiment plan and related data.On this basis, I improve the experiment by adding a constant speedmoving scenario to simulate the exact cell phone talking scene. Byprocessing and analyzing the received data, I collect the characteristicfading curve under these specific scenes and accurately modify the keyparameter in fitted model. The human body effect varies from4dB to10dB with different cell position. The static model fits best with theoptimized ITU-R.P1238model while the moving model fits theKeenan-Motley model.In the end of this study, I sum up the key parameters of signaltransmitting model under several common talking scenes and raiseoptimizing suggestions for indoor system antenna location.