Views: 0 Author: Site Editor Publish Time: 2022-10-10 Origin: Site
The high data transmission rate required by the wifi antenna communication system makes people devote themselves to the research and development of more advanced and efficient coding and modulation technologies to improve the efficiency of wireless frequencies, and also puts forward more stringent requirements for rf front-end. The efficiency and linearity of power amplifier are a set of contradictory indicators, which must be coordinated to optimize the communication system performance.
LINC (Linear Amplification Using Non linear Components) technology is a transmission technology that can meet the requirements of both high efficiency and high linearity. The architecture of LINC transmitter technology was first proposed by Chirex in 1935. However, due to the complexity of using analog circuits to realize trigonometric functions and square root circuits, Wifi antennas did not receive enough attention to LINC technology until 1974, when Cox in North America first described it under the name of LINC. LINC technology is to decompose an amplitude and phase modulation signal into two constant envelope phase modulation signals, and then through two power amplifiers with the same characteristics, Z will synthesize the two signals into an initial variable envelope signal for output. LINC technology uses a high efficiency nonlinear power amplifier to amplify the constant envelope phase modulation signal, which can avoid the adverse effects caused by the nonlinearity of the power amplifier, thus ensuring the high linearity and high efficiency of the transmitter. Theoretically, the efficiency of power amplifier can reach 100%, which is of great significance for the non constant envelope modulation technology. The input signal is separated into two channels of constant envelope signal SCS (Signal Component Separate), which plays a key role in transmitter performance. In this paper, the SCS algorithm will be described, and through the analysis and comparison of different implementation circuits, a less resource consuming implementation method will be proposed. At the same time, the LINC system is simulated.
