Towards reconstruction of unlensed, intrinsic CMB power spectra from
  lensed map
  We propose a method to extract the unlensed, intrinsic CMB temperature and
polarization power spectra from the observed (i.e., lensed) spectra. Using a
matrix inversion technique, we demonstrate how one can reconstruct the
intrinsic CMB power spectra directly from lensed data for both flat sky and
full sky analyses. The delensed spectra obtained by the technique are
calibrated against the Code for Anisotropies in the Microwave Background (CAMB)
using WMAP 7-year best-fit data and applied to WMAP 9-year unbinned data as
well. In principle, our methodology may help in subtracting out the E-mode
lensing contribution in order to obtain the intrinsic B-mode power.
