Title :
Comments on “Bitwise Log-Likelihood Ratios for Quadrature Amplitude Modulations”
Author :
Papaharalabos, Stylianos ; Mathiopoulos, P. Takis ; Martina, Maurizio ; Masera, Guido
Author_Institution :
Lab. of Wireless Commun., Nat. Centre for Sci. Res. `Demokritos´, Athens, Greece
Abstract :
With reference to a recently published letter, the purpose of our contribution is two-fold. Firstly, to point out that, what is referred to as a new approximation function MinC (see Eqs. (5)-(8) of Park, 2015) has been previously published (see Eq. (12) of Papaharalabos et al., 2009). Secondly, we present additional related published works of ours, which have further investigated the subject of bitwise log-likelihood ratio (LLR) simplification in soft-output decoding, but have not been mentioned in Park, 2015.
Keywords :
approximation theory; decoding; quadrature amplitude modulation; approximation function; bitwise log-likelihood ratios; quadrature amplitude modulations; soft-output decoding; Chebyshev approximation; Complexity theory; Decoding; Demodulation; Jacobian matrices; Quadrature amplitude modulation; Jacobian logarithm; Soft-output demodulation/decoding; bitwise log-likelihood ratio (LLR); bitwise loglikelihood ratio (LLR);
Journal_Title :
Communications Letters, IEEE
DOI :
10.1109/LCOMM.2015.2480080
