CDMA base station system

A code division multiple access (CDMA) base station system, comprising:

• a transmitter configured to modulate and transmit a first signal through a first antenna, said first signal passing through a transmission frequency band filter;
• a receiver configured to receive and demodulate a second signal through a second antenna, said second signal being converted to a frequency band by a receiving frequency converter;
• a radio frequency (RF) characteristic analyzer coupled to monitor and analyze an output signal of each of the transmitter and the receiver and determine an extent of signal degradation, and to provide a monitoring signal based on the level of degradation, the RF characteristic analyzer comprising a first analyzing circuit including a first analog-to-digital (A/D) converter coupled to convert an output of the frequency band filter into a digital signal, and a second analyzing circuit that includes a second A/D converter coupled to convert an output of the frequency converter into a digital signal,
• wherein the RF characteristic analyzer is coupled to the frequency band filter and the receiving frequency converter and includes transmission and reception band rejection filters to respectively filter out unwanted signals outputted from the frequency band filter and the receiving frequency converter, the RF characteristic analyzer determining whether the unwanted signals are increasing or decreasing, and
• wherein the first analyzing circuit and the second analyzing circuit further comprise:
• a differentiator coupled to receive the digital output signal of the associated first or second A/D converter and generate a differentiated output signaL
• an integrator coupled to receive the digital output signal of the associated first or second A/D converter and generate an integrated output signal.

A radio frequency (RF characteristic analyzer for a communications system, comprising:

• an input/output module, coupled to the communications system;
• a first analyzing circuit coupled to receive and analyze a transmission signal of the communications system through the input/output module;
• a second analyzing circuit coupled to receive and analyze a reception signal of the communications system through the input/output module;
• and
• an alarm circuit coupled to receive analyzed data from the first and second analyzing circuits, and configured to provide at least one alarm message according to the analyzed data,
• wherein the first analyzing circuit comprises:
• an analog-to-digital (A/D) converter coupled to receive the transmission signal and convert it into a digital output signal;
• a differentiator coupled to receive the digital output signal of the A/D converter and generate a differentiated output signal;
• an integrator coupled to receive the digital output signal of the A/D converter and generate an integrated output signal.

A base station system, comprising:

• a radio frequency (RF) characteristic analyzer configured to monitor and analyze output signals of a transmission frequency band filter and a receiving frequency converter so as to determine if a call quality of the base station is going to, the RF characteristic analyzer comprising a first analyzing circuit including a first analog-to-digital (A/D) converter coupled to convert an output of the frequency band filter into a digital signal, and a second analyzing circuit that includes a second A/D converter coupled to convert an output of the frequency converter into a digital signal;
• and
• an alarm circuit configured to generate at least one alarm if the RF characteristic analyzer determines the call quality is going to deteriorate,
• wherein the RF characteristic analyzer is coupled to the frequency band filter and the receiving frequency converter and includes transmission and reception band rejection filters to respectively filter out unwanted signals outputted from the frequency band filter and the receiving frequency converter, the RF characteristic analyzer determining whether the unwanted signals are increasing or decreasing
• wherein the first analyzing circuit and the second analyzing circuit further comprise:
• a differentiator coupled to receive the digital output signal of the associated first or second A/D converter and generate a differentiated output signal;
• an integrator coupled to receive the digital output signal of the associated first or second A/D converter and generate an integrated output signal.