For a mobile communication system, the function of a mobile communication transmitter is to process the input information (including voice and data) of the terminal through baseband processing, modulate it to a specified carrier according to a certain modulation method, and then amplify the power before transmitting it from the antenna. The working principle of the transmitter is as follows: the voice or data information to be transmitted is sent to the baseband processing section of the transmitter for baseband processing. The content of baseband processing includes speech amplification, analog-to-digital conversion, encoding, encryption, frame structure formation, etc. The signal processed by baseband is sent to the modulation circuit for modulation according to a certain modulation method. The modulation methods of mobile communication can be divided into three categories: amplitude modulation, frequency modulation, and phase modulation, but each category can have multiple different methods. Commonly used methods include AM, FM, MSK, GMSK, DPSK, QPSK, π/4-QPSK, QAM, etc. The modulated carrier is usually not at the transmission frequency, so it needs to be mixed and moved to the transmission frequency. The function of a frequency synthesizer is to provide a high-precision and highly stable frequency source, which generates different frequencies under the control of the control processing circuit and sends them to the mixing circuit, moving the carrier frequency to the desired RF. Finally, the RF signal passes through a filtering circuit and a power amplifier circuit and is sent to the antenna for transmission. The control processing circuit includes microprocessors, memory, logic control, timing generation and control, etc. Due to differences in the content, modulation methods, implementation performance, and functions of information processing, mobile communication transmission opportunities have different specific forms and implementation plans. The function of a mobile communication receiver is to select and amplify the required signal from the RF signal received by the antenna, demodulate it according to a certain modulation method, and then send the demodulated signal to the baseband for processing, restoring it to the original voice signal or data information output. The working principle is as follows: The front-end of the receiver sends the weak signal received by the antenna into the RF tuning amplification circuit, selects the required frequency signal and amplifies it, then enters the mixing circuit, moves the carrier frequency to the intermediate frequency, and enters the intermediate frequency amplification stage. The intermediate frequency amplification stage can include secondary mixing and secondary intermediate amplifier, reducing the signal carrying information to a suitable intermediate frequency. At present, mobile communication receivers mostly adopt secondary frequency conversion schemes, with the first intermediate frequency selected higher to facilitate image frequency suppression. The commonly used first intermediate frequencies include 10.7MHz, 21.4MHz, 58.1MHz, etc; The second intermediate frequency is selected lower to facilitate adjacent channel interference suppression. Some mobile communication receivers may also adopt a triple frequency conversion scheme. The useful signal is processed by the intermediate frequency circuit and sent to the demodulation circuit. The demodulation circuit demodulates the signal according to a certain modulation method, and then sends the demodulated signal to the baseband processing circuit for processing. Contrary to the content of transmitter baseband processing, the content of receiver baseband processing includes decoding, decryption, digital to analog conversion, and speech amplification. Similarly, mobile communication receivers also come in different specific forms and implementation schemes