What is a PAPR machine?

PAPR usually refers to "Peak to Average Power Ratio", which is the ratio of the peak power to the average power of a signal. It is an important parameter for describing signal characteristics, especially in the fields of wireless communication and signal processing.

Definition: PAPR is the ratio of the peak power to the average power of a signal. It is usually expressed in decibels (dB).

Principle: In multi-carrier systems (such as OFDM), multiple subcarrier signals are combined to form a composite signal. When the phases of these subcarriers align at a certain moment, a high peak power is generated, resulting in a high PAPR.

Impact: High PAPR can cause signal distortion and spectral expansion, affecting the performance of communication systems. It may also reduce the efficiency of power amplifiers and increase system energy consumption.

Application: PAPR is very important in the design and optimization of wireless communication systems. By reducing PAPR, the performance and efficiency of the system can be improved, and signal distortion and interference can be reduced.

Measurement: PAPR can be calculated by measuring the peak power and average power of the signal. This usually requires the use of professional measurement equipment, such as a radio frequency power meter.

Technology: To reduce PAPR, various technologies have been developed, such as signal predistortion, selective mapping, and partial transmission sequences. These technologies aim to reduce PAPR by adjusting the phase and amplitude of the signal.

Related technologies: PAPR is closely related to other wireless communication technologies such as MIMO (Multiple Input Multiple Output) and OFDM (Orthogonal Frequency Division Multiplexing). These technologies aim to increase the capacity and efficiency of communication systems.

Standards: In 5G communication standards, PAPR is an important consideration. New waveform technologies such as FBMC, UFMC, and GFDM are being studied to reduce PAPR.