A Novel Digital Predistortion Identification Algorithm Based on Variable Forgetting Factor Recursive Least Square Method

Figure 9

Constellation diagram after predistortion.

(a) Without DPD constellation diagram

(b) With DPD (RLS) constellation diagram

(c) With DPD (VFFRLS (1)) constellation diagram

(d) With DPD (VFFRLS (2)) constellation diagram

(e) With DPD (NVFFRLS) constellation diagram