General memory polynomial (GMP) digital pre-distortion circuit based on lookup table (LUT)

The invention relates to the technical field of wireless communication. The invention discloses a general memory polynomial (GMP) digital pre-distortion circuit based on a lookup table (LUT). The method comprises: firstly, expressing a GMP pre-distortion system as u (n) = w (n) + f (n) + b (n), then arranging the expressions of w (n), f (n) and b (n), and using a lookup table function LUT (| x (n)|) to reduce the usage amount of multipliers in an FPGA. According to the invention, the LUT is used to replace a large number of multiplication operations, so that the usage amount of multipliers can be greatly reduced, the usage amount of multipliers is not increased by increasing nonlinear orders, and the system is convenient to realize expansion. 本发明涉及无线通信技术领域，本发明公开了一种基于查找表LUT的一般记忆多项式GMP数字预失真电路，先将一般记忆多项式GMP预失真系统表示为u(n)＝w(n)+f(n)+b(n)，再对w(n)、f(n)和b(n)的表达式进行整理，并利用查找表函数LUT(|x(n)|)减少FPGA中乘法器的使用量。本发明利用查找表LUT来代替大量乘法运算的方式，可大大减少乘法器的使用量，且增加非线性阶数可不增加乘法器的用量，便于系统实现扩展。