基于FPGA的LINC发射机的设计

The design of LINC transmitter based on FPGA

随着数字通信的发展,频带利用率高的非恒包络调制技术,如QAM,OFDM等受到越来越多的重视,然而,这些调制技术对功率放大器的线性化要求也越高。对于功放而言,线性与效率是一对矛盾,一方性能的提高,就会引起另一方性能的降低。LINC发射机,在本质上,是一种线性发射机,它能克服功放的非线性所带来的负面影响,并能够利用效率很高的非线性功放。SCS(Signal Components Separator)是LINC发射机实现的关键,本文就着重于基于CORDIC算法的SCS的设计与实现。

With the development of digital communication, non-constant envelope modulation techniques with high frequency efficiency, such as QAM, OFDM, are paid more attention on. However, these modulation techniques require power amplifier with high linearity .For power amplifier, it is a paradox between linearity and efficiency, one is higher, and the other one is lower.LINC transmitter, in nature, is a linear transmitter, which can employ non-linear power amplifier with higher efficiency, and can overcome the side-effect of power amplifier's non-linearity. SCS (signal components separator) is the key of realizing LINC transmitter .This paper takes emphasis on the design and implement of SCS based on CORDIC algorithm.