@article{(Open Science Index):https://publications.waset.org/pdf/10430,
	  title     = {Optimization of Quantization in Higher Order Modulations for LDPC-Coded Systems},
	  author    = {M.Sushanth Babu and  P.Krishna and  U.Venu and  M.Ranjith},
	  country	= {},
	  institution	= {},
	  abstract     = {In this paper, we evaluate the choice of suitable
quantization characteristics for both the decoder messages and the
received samples in Low Density Parity Check (LDPC) coded
systems using M-QAM (Quadrature Amplitude Modulation)
schemes. The analysis involves the demapper block that provides
initial likelihood values for the decoder, by relating its quantization
strategy of the decoder. A mapping strategy refers to the grouping of
bits within a codeword, where each m-bit group is used to select a
2m-ary signal in accordance with the signal labels. Further we
evaluate the system with mapping strategies like Consecutive-Bit
(CB) and Bit-Reliability (BR). A new demapper version, based on
approximate expressions, is also presented to yield a low complexity
hardware implementation.},
	    journal   = {International Journal of Electronics and Communication Engineering},
	  volume    = {6},
	  number    = {1},
	  year      = {2012},
	  pages     = {75 - 81},
	  ee        = {https://publications.waset.org/pdf/10430},
	  url   	= {https://publications.waset.org/vol/61},
	  bibsource = {https://publications.waset.org/},
	  issn  	= {eISSN: 1307-6892},
	  publisher = {World Academy of Science, Engineering and Technology},
	  index 	= {Open Science Index 61, 2012},