Journal ArticleDOI
Symbol mapping diversity design for multiple packet transmissions
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This paper presents a simple, but effective method of enhancing and exploiting diversity from multiple packet transmissions in systems that employ nonbinary linear modulations such as phase-shift keying (PSK) and quadrature amplitude modulation (QAM).Abstract:
In this paper, we present a simple, but effective method of enhancing and exploiting diversity from multiple packet transmissions in systems that employ nonbinary linear modulations such as phase-shift keying (PSK) and quadrature amplitude modulation (QAM). This diversity improvement results from redesigning the symbol mapping for each packet transmission. By developing a general framework for evaluating the upper bound of the bit error rate (BER) with multiple transmissions, a criterion to obtain optimal symbol mappings is attained. The optimal adaptation scheme reduces to solutions of the well known quadratic assignment problem (QAP). Symbol mapping adaptation only requires a small increase in receiver complexity but provides very substantial BER gains when applied to additive white Gaussian noise (AWGN) and flat-fading channels.read more
Citations
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Journal ArticleDOI
A survey for the quadratic assignment problem
Eliane Maria Loiola,Nair Maria Maia de Abreu,Paulo Oswaldo Boaventura-Netto,Peter M. Hahn,Tania Maia Querido +4 more
TL;DR: This paper presents some of the most important QAP formulations and classify them according to their mathematical sources and gives a detailed discussion of the progress made in both exact and heuristic solution methods, including those formulated according to metaheuristic strategies.
Journal ArticleDOI
Distribution of L-values in gray-mapped M 2 -QAM: closed-form approximations and applications
TL;DR: This paper develops closed form approximations for the probability density function of the reliability metrics (L-values) in bit-interleaved coded modulation (BICM) that are valid for M2-ary quadrature amplitude modulations with binary reflected Gray mapping when the metrics are calculated using the so-called max-log approximation
Journal ArticleDOI
Hybridizing Biogeography-Based Optimization With Differential Evolution for Optimal Power Allocation in Wireless Sensor Networks
TL;DR: This paper aims to develop a numerical solution for the optimal power allocation scheme via a variation of the biogeography-based optimization (BBO) algorithm, which is called the constrained BBO-DE algorithm, a hybridization of a very recently proposed stochastic optimization algorithm.
Journal ArticleDOI
Signal space cooperative communication
TL;DR: Signal space cooperation is introduced, in which cooperation between the source and the relay is achieved using a novel constellation design that enables the relay to extract the required information in order to effectively cooperate in the relay phase.
Journal ArticleDOI
The quadratic three-dimensional assignment problem: Exact and approximate solution methods
Peter M. Hahn,Bum-Jin Kim,Thomas Stützle,Sebastian Kanthak,William L. Hightower,H. Samra,Zhi Ding,Monique Guignard +7 more
TL;DR: An exact solution method based upon a reformulation linearization technique that is one of the best available for solving the quadratic assignment problem (QAP) and is useful for Q3AP instances of size 13 or smaller is presented.
References
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Journal ArticleDOI
Channel coding with multilevel/phase signals
TL;DR: A coding technique is described which improves error performance of synchronous data links without sacrificing data rate or requiring more bandwidth by channel coding with expanded sets of multilevel/phase signals in a manner which increases free Euclidean distance.
Posted Content
Assignment Problems and the Location of Economic Activities
Journal ArticleDOI
Rate-compatible punctured convolutional codes (RCPC codes) and their applications
TL;DR: In this article, the concept of punctured convolutional codes is extended by punctuating a low-rate 1/N code periodically with period P to obtain a family of codes with rate P/(P+l), where l can be varied between 1 and (N-1)P. This allows transmission of incremental redundancy in ARQ/FEC (automatic repeat request/forward error correction) schemes and continuous rate variation to change from low to high error protection within a data frame.
Book
Error Control Systems for Digital Communication and Storage
TL;DR: This work has shown that polynomials over Galois Fields, particularly the Hadamard, Quadratic Residue, and Golay Codes, are good candidates for Error Control Coding for Digital Communication Systems.
Journal Article
Rate-compatible punctured convolutional codes (RCPC codes) and their applications
TL;DR: The concept of punctured convolutional codes is extended by punctuating a low-rate 1/N code periodically with period P to obtain a family of codes with rate P/(P+l), where l can be varied between 1 and (N-1)P.