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Coded modulation using superimposed binary codes
 IEEE Trans. Inform. Theory
, 2004
"... Abstract—In this correspondence, we investigate in a comprehensive fashion a onelayer coding/shaping scheme resembling a perfectly cooperated multipleaccess system. At the transmitter, binary data are encoded by either singlelevel or multilevel codes. The coded bits are first randomly interleaved ..."
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Cited by 34 (14 self)
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Abstract—In this correspondence, we investigate in a comprehensive fashion a onelayer coding/shaping scheme resembling a perfectly cooperated multipleaccess system. At the transmitter, binary data are encoded by either singlelevel or multilevel codes. The coded bits are first randomly interleaved and then entered into a signal mapper. At each time, the signal mapper accepts as input multiple binary digits and delivers as output an amplitude signal, where the input are first independently mapped into 2PAM signals (possibly having different amplitudes) and then superimposed to form the output. The receiver consists of an iterative decoding/demapping algorithm with an entropybased stopping criterion. In the special cases when all the 2PAM signals have equal amplitudes, based on an irregular trellis, we propose an optimal softinput–softoutput (SISO) demapping algorithm with quadratic rather than exponential complexity. In the general cases, when multilevel codes are employed, we propose powerallocation strategies to facilitate the iterative decoding/dempaping algorithm. Using the unequal powerallocations and the Gaussianapproximationbased suboptimal demapping algorithm (with linear complexity), coded modulation with high bandwidth efficiency can be implemented. Index Terms—Coded modulation, coding/shaping scheme, iterative decoding/demapping algorithm, iterative multistage decoding, multilevel coding, sigmamapping, softinput–softoutput (SISO) demapping algorithm. I.
Statistical decision making in adaptive modulation and coding for 3G wireless systems
 IEEE Trans. Veh. Technol
, 2005
"... c○James Yang 2002I hereby declare that I am the sole author of this thesis. I authorize the University of Waterloo to lend this thesis to other institutions or individuals for the purpose of scholarly research. I further authorize the University of Waterloo to reproduce this thesis by photocopying o ..."
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Cited by 7 (0 self)
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c○James Yang 2002I hereby declare that I am the sole author of this thesis. I authorize the University of Waterloo to lend this thesis to other institutions or individuals for the purpose of scholarly research. I further authorize the University of Waterloo to reproduce this thesis by photocopying or by other means, in total or in part, at the request of other institutions or individuals for the purpose of scholarly research. ii The University of Waterloo requires the signatures of all persons using or photocopying this thesis. Please sign below, and give address and date. In this thesis, the application of Adaptive Modulation and Coding (AMC) for 3rdGeneration (3G) wireless systems is addressed. A new method for selecting the appropriate Modulation and Coding Schemes (MCS) according to the estimated channel condition is proposed. In this method, a statistical decision making approach is taken to maximize the average throughput while maintaining an acceptable Frame Error Rate (FER). A firstorder finitestate Markov model is used to
Performance of nonuniform Mary QAM constellation on nonlinear channels,” Australian Commun. Theory Workshop
, 2005
"... Abstract — This paper investigates the effects of the nonequiprobable distribution of a high bandwidth efficiency Mary QAM signal constellation on the error performance for nonlinear channels. A simple nonlinear channel model where the phase and amplitude of the transmitted samples are distorted by ..."
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Cited by 3 (1 self)
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Abstract — This paper investigates the effects of the nonequiprobable distribution of a high bandwidth efficiency Mary QAM signal constellation on the error performance for nonlinear channels. A simple nonlinear channel model where the phase and amplitude of the transmitted samples are distorted by a nonlinear function with additive white Gaussian noise (AWGN) in the downlink was simulated. Simulation results for binary turbo coded modulation (TCM) show a 3 dB improvement when the distribution of the signal constellation is nonequiprobable. Index Terms—Nonequiprobable constellation, high order modulation, nonlinear channel, spectral efficiency I.
On the efficiency of transmission strategies for broadcast channels using finite size constellations
 in 21st European Signal Processing Conference (Marrakech, 9–13 Sept 2013
"... In this paper, achievable rates regions are derived for power constrained Gaussian broadcast channel of two users using finite dimension constellations. Various transmission strategies are studied, namely superposition coding (SC) and superposition modulation (SM) and compared to standard schemes ..."
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Cited by 3 (2 self)
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In this paper, achievable rates regions are derived for power constrained Gaussian broadcast channel of two users using finite dimension constellations. Various transmission strategies are studied, namely superposition coding (SC) and superposition modulation (SM) and compared to standard schemes such as time sharing (TS). The maximal achievable rates regions for SM and SC strategies are obtained by optimizing over both the joint probability distribution and over the positions of constellation symbols. The improvement in achievable rates for each scheme of increasing complexity is evaluated in terms of SNR savings for a given target achievable rate or/and percentage of gain in achievable rates for one user with reference to a classical scenario. Index Terms — AWGN broadcast channels, achievable rates region, superposition coding, signal constellations, shaping gains. 1.
Transactions Letters________________________________________________________________ Constellation Shaping for Pragmatic TurboCoded Modulation With High Spectral Efficiency
"... Abstract—We propose a new turboencoding scheme for high spectral efficiency with performance close to the Gaussian channel capacity. The scheme combines nonuniform signaling on a Gaussian channel with pragmatic turbocoded modulation (TCM) for simple and flexible implementation. A variablerate tur ..."
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Abstract—We propose a new turboencoding scheme for high spectral efficiency with performance close to the Gaussian channel capacity. The scheme combines nonuniform signaling on a Gaussian channel with pragmatic turbocoded modulation (TCM) for simple and flexible implementation. A variablerate turbo code is followed by a Huffmann code mapping onto nonequiprobable points in a quadrature amplitude modulation constellation. The rate of the turbo code is matched to the Huffmann code by variable puncturing, such that both the input bit rate and the output symbol rate are constant. It is shown that the new scheme provides shaping gains of 0.6 and 0.9 dB, at rates 2 and 3 b/dimension, respectively, compared with the equiprobable pragmatic TCM, and reach about 1 dB from the continuous input Gaussian channel capacity. Index Terms—high spectral efficiency modulation, signal shaping, turbo codes. I.
RESEARCH Open Access
"... Achievable rates optimization for broadcast channels using finite size constellations under transmission constraints Zeina Mheich1,2,3, Florence Alberge1,2,3 * and Pierre Duhamel1,2,3 In this paper, maximal achievable rate regions are derived for powerconstrained AWGN broadcast channel involving fi ..."
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Achievable rates optimization for broadcast channels using finite size constellations under transmission constraints Zeina Mheich1,2,3, Florence Alberge1,2,3 * and Pierre Duhamel1,2,3 In this paper, maximal achievable rate regions are derived for powerconstrained AWGN broadcast channel involving finite constellations and two users. The achievable rate region is studied for various transmission strategies including superposition coding and compared to standard schemes such as time sharing. The maximal achievable rates are obtained by optimizing over both the joint distribution of probability and over the constellation symbol positions. A numerical solution is proposed for solving this nonconvex optimization problem. Then, we consider several variations of the same problem by introducing various constraints on the optimization variables. The aim is to evaluate efficiency vs. complexity tradeoffs of several transmission strategies, some of which (the simplest ones) can be found in actual standards. The improvement for each scheme is evaluated in terms of SNR savings for target achievable rates or/and percentage of gain in achievable rates for one user compared to a reference scheme. As an application, two scenarios of coverage areas and user alphabets are considered. This study allows to evaluate with practical criteria the performance improvement brought by more advanced schemes.
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"... Schémas pratiques pour la diffusion (sécurisée) sur les canaux sans fils ..."
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