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This paper provides a simplified design scheme for the control of a class of nonlinear systems in strict-feedback form by incorporating dynamic surface control (DSC) method into an adaptive fuzzy logic system. The DSC method overcomes the problem of ldquoexplosion of complexityrdquo in the traditional backstepping design. Fuzzy logic system (FLS) is used to approximate the nonlinear uncertainty. Adaptation...
This paper examines the effect of relay-assisted soft handover on the performance of the uplink communication in the third generation mobile networks. We focus on users which are traveling over two cell boundaries in a cellular infrastructure and operating over the same frequency band. We consider a scheme in which the relay is requested to cooperate only if the mobile source fails in its soft handover...
In this paper a macrodiversity system with two microdiversity system is considered. Microdiversity system is used to reduce the effects of Rayleigh fading to the system performance and macrodiversity system is used to reduce the effects of gamma fading to the system performance. Rayleigh density function is used to describe amplitude of received signal and gamma density function is used to model the...
In this paper, a new M-estimator based multiuser detection in asynchronous flat-fading non-Gaussian CDMA channels is considered. A new closed-form expression is derived for the characteristic function of the multiple-access interference signals. Simulation results are provided to prove the effectiveness of the derived bit-error probabilities obtained with this expression in asynchronous flat-fading...
In this paper, the ground-to-air channel model is studied and the simulation results of the model are provided. Then, we implement it in the improved single carrier frequency domain equalization (SC-FDE) system and compare the transmission characteristics in different conditions. Theoretical analysis and simulation results show that the BER performance of the proposed system can reach 10-7 or even...
This paper proposes a simple series form formula of the bit error rate (BER) for DBPSK/OFDM signals under time selective nonlinear fading channels. The proposed approach derives the theoretical BER in the presence of non-linear distortion and time selective fading effects. Since the BER is represented by the simple series form formula, the proposed approach frees us from the time-consuming computer...
In this paper we derive a lower bound on the bit error rate (BER) for the individual bit streams that can be mapped simultaneously in an hierarchical way onto generalized multilevel quadrature amplitude modulations (M-QAM). The expressions are valid for time-discrete multipath Rayleigh fading environments with imperfect channel estimation and can be regarded as an extension of the well-known matched...
This paper analyzes the performance bound of variable gain relaying over non-identical Nakagami-m fading channel, and the closed-form expressions for average bit error probability (ABEP) of binary phase shift keying (BPSK)modulation and multiple amplitude modulation (M-AM) are derived. Numerical and simulation results show that the deduced performance bound is a tight lower bound especially at medium...
We propose a new classification algorithm, variance considered machine (VCM), by modifying optimal hyperplanes of the support vector machine (SVM). The SVM is a good method to calculate a slope of optimal hyperplanes with maximal margin. However, this algorithm neglects to consider variances and prior probabilities of the data. It can increase probabilities of error. To solve this problem, the VCM...
A problem in large and dynamic networks consists in making available at each node global information about the state of the network. Gossip-based aggregation schemes are a simple yet effective mechanism to solve the problem. However, they have to cope with the dynamics either of the network and the values being aggregated and thus have to integrate specific solutions to deal with them. The contribution...
A bit error rate estimation method based on Parzen series is proposed for coherent detection QPSK transmission systems. Numerical simulation results show the proposed method's consistency with Monte Carlo method while keeping lower computational intensity.
By interpolating between communication theory and synergetics, we provide a bridge to connect the two kinds of subjects. As applications, the capacity formula of multiple input and multiple output (MIMO) Gaussian channels is derived by using the Fokker-Planck Equation of the synergetics, it is in accordance with the Telatar's capacity and gives a physical explanation of the observed channel characteristics...
In this paper, a study of the differential chaos shift keying for discrete time implementations is proposed. Then we analysed the performance of this modulation system. A new approach is considered to compute an exact bit error rate expression. The idea of this approach is to compute the probability density function of the chaotic bit energy and to integrate the bit error rate over all possible values...
In this paper we present a general methodology for the interleaver and code design for QAM-based BICM transmissions. We develop analytical bounds on the bit error rate and we use them to predict the performance of BICM when unequal error protection (UEP) is introduced by the constellation labeling. Based on these bounds, the optimum design of interleaver and code is presented. The improvements obtained...
We consider an amplify-and-forward (AF) cooperative-diversity system where a source node communicates with a destination node directly and indirectly (through multiple relays), in this paper, we analyze the system where N multiple relays that have the strongest signal strength at the destination are selected out of M relays and forward their received data from the source node to the destination node...
In this paper, the performances analysis of cooperative-diversity networks using adaptive decode-and-forward (DF) relaying over independent non-identical flat Nakagami-m fading channels is investigated. We derive closed-form expressions for the error probability, outage probability and average channel capacity, and analyze their dependence on the channel parameters. In adaptive DF relaying, among...
Aggregation operations are important for users to get summarization information in WSN applications. As large numbers of applications only require approximate aggregation results rather than the exact ones, some approximate aggregation algorithms are proposed to save energy. However, the error bounds of these algorithms are fixed and it is impossible to adjust their error bounds automatically. Therefore,...
A random coding theorem for nonlinear additive Gaussian channels is presented. Modeling the channel's nonlinear behavior as a causal, stationary Volterra system and under maximum likelihood decoding, an upper bound on the average error probability is obtained. The proposed bound is deduced by deploying exponential martingale inequalities. Cubic nonlinearities are used as example to illustrate the...
In this paper, we deal with the analytical performance study of spatial multiplexing (SM) multiple-input multiple-output (MIMO) systems experiencing flat Rayleigh fading and log-normal shadowing. We address the problem of finding a tractable expression for the symbol error outage (SEO) in this environment. In order to obtain the SEO, a symbol error probability (SEP) inversion w.r.t. the signal to...
For a three-node cooperative network model we propose a novel relaying strategy, referred to as selective decode-and-forward/ampliy-and-forward (selective DF/AF), and analyze its symbol error rate (SER) performance. In the proposed scheme, the relay always cooperate: when it is able to decode correctly the transmitted information symbols it forwards the decoded information to the destination, when...
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