| 摘要 |
PURPOSE: A radio channel simulation method and an apparatus for analyzing performance of CDMA mobile communication system are provided to simulate various radio environments in a test center by simple controlling through a personal computer and discover any shortcomings at early stage and facilitate improving a performance by repeatedly performing simulation containing a handoff function in a development stage of a system. CONSTITUTION: Interference generators(112,121) generate additive white Gaussian noise to make an interference effect by a different user and a different base station in a backward and forward channel. The noise is applied in two mode, of which one applies the noise on a radio channel by the absolute amount to test an influence of the interference according to a traffic change in a neighboring cell or the same cell, and the other charges an applied amount of the noise while constantly maintaining a signal-to-noise ratio. Fading emulators(111,122) converts a signal so that a fading effect can be contained in an input signal similarly to an actual radio environment. The fading emulators(111,122) constructs the maximum 6 multiple paths by channels and controls a time delay, a power attenuation, a mobility speed of a mobile station and a fading distribution. A radio variable attenuator(130) emulates a path loss of the radio channel. Program attenuators(133,134) and fixed attenuators(131,132) are positioned at a forward and a backward radio link between two base stations(BTS1,BTS1) and the mobile station(MS) to control an attenuation amount. The program attenuators control the relative size of the attenuation amount by links formed between the base stations and the mobile station and emulates the path loss differentiated depending on the position of the mobile station. A controller(140) remotely controls the interference generators(112,121), the fading emulators(111,122) and the radio variable attenuator(130) by using a GPIB interface.
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