Light a grill or preheat a grill pan. In a small bowl, mix the sweet smoked paprika with the pure ancho chile powder, light brown sugar, cumin, coriander, cayenne pepper, 1/2 teaspoon of salt and ¼ teaspoon of black pepper. Brush the shrimp with the canola oil and season all over with the spice mixture. Grill the shrimp over moderately high heat, turning once, until they are lightly charred and cooked through, about 4 minutes total.