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【期刊论文】Coded Modulation Using Superimposed Binary Codes
马啸, Xiao Ma and Li Ping, Member, IEEE
IEEE TRANSACTIONS ON INFORMATION THEORY, VOL.50, NO.12, DECEMBER 2004,-0001,():
-1年11月30日
In this correspondence, we investigate in a comprehensivefashion a one-layer coding/shaping scheme resembling a perfectly cooperatedmultiple-access system. At the transmitter, binary data areencoded by either single-level or multilevel codes. The coded bits are firstrandomly interleaved and then entered into a signal mapper. At each time,the signal mapper accepts as input multiple binary digits and deliversas output an amplitude signal, where the input are first independentlymapped into 2-PAM signals (possibly having different amplitudes) andthen superimposed to form the output. The receiver consists of an iterativedecoding/demapping algorithm with an entropy-based stopping criterion.In the special cases when all the 2-PAM signals have equal amplitudes,based on an irregular trellis, we propose an optimal soft-input–soft-output(SISO) demapping algorithm with quadratic rather than exponentialcomplexity. In the general cases, when multilevel codes are employed,we propose power-allocation strategies to facilitate the iterative decoding/dempaping algorithm. Using the unequal power-allocations andthe Gaussian-approximation-based suboptimal demapping algorithm(with linear complexity), coded modulation with high bandwidth efficiencycan be implemented.
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【期刊论文】Power allocations for multilevel codingwith sigma mapping
马啸, X. Ma and L. Ping
ELECTRONICS LETTERS 13th May 2004 Vol.40 No.10,-0001,():
-1年11月30日
A recursive power-allocation method for multilevel coding systemswith sigma mapping is proposed. With the proposed power allocation,it is possible to design iteratively decodable capacity-approachingcodes with high bandwidth efficiency by using binary turbo-likecodes.
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