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LINC(Linear Amplifier Using Nonlinear Components)技术是使用非线性的功放来实现信号的线性放大。LINC技术克服了传统线性化技术的效率低,带宽窄的问题,理想情况下能够达到100%的效率。信号分离是LINC的关键技术,信号分离的特性严重影响了LINC合成信号的性能。根据LINC技术信号分离原理,采用CORDIC算法来实现输入信号的幅相分离,将输入的调幅调相的变包络信号分离成两路恒包络调相信号。同时采用了一种优化的信号分离算法,把初步分离的两路数据进行角度比较,根据选择最小夹角原则重新分配两路数据,达到改进信号包络的目的。对信号分离过程进行仿真验证,表明信号的恒包络特点得到了显著改善,最后使用FPGA实现。
LINC (Linear Amplifier Using Nonlinear Components) technology is the use of non-linear amplifier to achieve linear amplification of the signal. LINC overcomes the problem of low efficiency and narrow bandwidth of the conventional linearization technology, and can achieve 100% efficiency under ideal conditions. Signal separation is the key technology of LINC. The characteristics of signal separation seriously affect the performance of LINC synthesis signal. According to the principle of signal separation of LINC technology, the CORDIC algorithm is used to realize the amplitude and phase separation of the input signal, and the input amplitude and phase modulation variable envelope signal is separated into two channels of constant envelope phase modulation signal. At the same time, an optimized signal separation algorithm is adopted to compare the initially separated two channels of data and redistribute the two channels according to the principle of selecting the smallest angle to achieve the purpose of improving the signal envelope. Simulation of the signal separation process simulation shows that the constant envelope characteristics of the signal has been significantly improved, and finally the use of FPGA implementation.