BASE STATION TRANSMISSION AND RECEPTION PERFORMANCE ANALYZING APPARATUS IN CDMA SYSTEM

摘要

PURPOSE: A base station transmission and reception performance analyzing apparatus in a CDMA system is provided to improve an attenuation characteristic in testing a characteristic and implement an optimum single tone testing environment by installing a terminal duplexer and a band pass filter between a base station and a terminal and giving a sufficient isolation to thereby provide a similar testing environment as a radio link environment. CONSTITUTION: A cavity duplexer(11) receives an RF signal from a main path of a base station(1) and outputs it to a high power attenuator(12). The high power attenuator(12) receives an RF signal having a great absolute level from the cavity duplexer(11). The first variable attenuator(13) receives the RF signal attenuated to below an absolute level from the high power attenuator(12). A terminal duplexer(100) receives the RF signal from the first variable attenuator(13) and outputs it to a terminal(2). A band-pass filter(200) receives the RF signal from the terminal duplexer(100). A splitter(15) splits the RF signal received from the band-pass filter(200) into the first path and the second path and outputs them to the first AWGN(Adaptive White Gaussian Noise)(16) and the second AWGN(23). The first AWGN(16) applies an external noise to the RF signal inputted through the first path. The second variable attenuator(17) receives the RF signal through the first AWGN(16). The first noise signal generator(18) generates a radio interference signal for a single tone testing. The second noise signal generator(19) generates a radio interference signal for a double-tone testing along with the radio interference signal outputted from the first noise signal generator(18). The second combiner(20) receives the radio interference signals from the first noise signal generator(18) and the second noise signal generator(19). The third combiner(21) adds the radio interference signal received from the second combiner(20) to the RF signal received from the second variable attenuator(17) and outputs the RF signal to the third variable attenuator(22).