correct some compiling error
add the discussion about NDR
add the second optimization problem
clean some error in the smooth fitting section
clean some grammar problem
small word change
finishing the paragraph on tikhonov regularization
change the equation error of the Tikhonov regularization
change method to conjugate gradient
Merge branch 'master' of https://git.cased.de/git/lpndss
finish l1 regularization on to effect of modulation
finish discussion on power change and modulation order
correct some wrong claim in D and E
grammar checking
onto experiment
finish the first two subsection in experiments