A General Order Reduction Method of Wideband Digital Predistortion Model Using Attention Mechanism

Algorithm 1

Training of the order reduction method

Definition:

 1. Construct the structure of the order reduction method;

 2. Obtain the training data, including the input and output data of the training;

 3. Define as the cost function of training.

Training of the method:

 1. Initialization:

  1) Set the learning rate , and the training parameters , , ;

  2) Initialize vector and ;

  3) Initialize coefficients .

 2. Training:

Loop:

  1) Calculate the output of the attention module from Equation (17);

  2) Calculate model output from Equation (19);

  3) Calculate the cost function from Equation (20);

  4) Calculate vector and ;

  5) Update coefficients .

End