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This paper carries out the first-ever study of the feasibility of using chaos shift keying (CSK) in a Multiple-Input, Multiple-Output (MIMO) channel. To that end, an Alamouti space time code scheme is combined with the CSK system for 2 transmit and 2 receiver antennas. Once the design of CSK-MIMO system is presented, the performance of the proposed system is analyzed in a mono-user case. An exact...
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...
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 work, a new closed form physical channel fading model, which we term m-n distribution, is introduced. The m-n distribution includes many distributions known in literature as special cases such as Rayleigh, Weibull, Nakagami-m, generalized gamma distributions, etc and their reciprocal distributions. Its statistical properties such as Laplace, Mellin moment generating functions and fractional...
Increasing the accuracy of munitions can be accomplished in various ways. One method is to use on-board guidance systems that can steer a missile to within meters or less of its target. However, this approach is expensive. A less costly more inaccurate alternative is the spin stabilization approach. These systems lack close-loop flight control and many of the sophisticated sensor found in on-board...
This paper presents a performance of the UWB system in a time hopping binary pulse position ultra-wideband modulation scheme (TH BPPM-UWB) in the presence of an AWGN channel. This performance was illustrated using an analytical method based on the evaluation of the bit error probability versus signal to noise ratio(SNR). We have extend the method used in a one user environment to the multi-user environments...
This paper presents a method for the evaluation of the bit error probability of a time hopping binary pulse amplitude ultra-wideband modulation scheme. We will also study different pulse waveforms applicable in the context of UWB to see the characteristics of each one and the contribution they can provide when used in UWB applications.
The Mahalanobis metric was proposed by extending the Mahalanobis distance to provide a probabilistic distance for a non-normal distribution. The Mahalanobis metric equation is a nonlinear second order differential equation derived from the equation of geometrically local isotropic independence, which is proposed to define normal distributions in a manifold. In this paper we provide experimental results...
An exact mathematical model which explains the important characteristics of the probability density function (PDF) of the multiple access interference (MAI) in time-hopping UWB (TH-UWB) systems is discussed. The proposed model accurately foresees impulses, singularities, and heavy tails found in the distribution of the MAI. Also, it discloses precisely why a Gaussian approximation for the MAI in TH-UWB...
Currently, among the main three affectors of transmission quality (represented by the mean probability of a bit error) for a particular digital modulation format, such as eg. GMSK, fast fading seems to be by far mostly dealt with, in particular, analytically, while such an analysis for the other two aspects, namely, slow fading and quasideterministic attenuation of the signal is usually too complex,...
In this paper we derive optimal power allocation (PA) in space and time that minimizes BER for transmitter selection in multi-input-single-output (MISO) Rayliegh fading channels assuming perfect channel state information (CSI) is available at receiver and transmitter. This power allocation scheme achieves exponential diversity order with a single RF front end and requires feedback of the best channel...
In this paper we derive optimal power allocation scheme that minimizes bit error rate (BER) while satisfying the average power constraint and peak to average power ratio (PAPR) constraint (which translates to minimizing the PAPR). The power allocation is done in space and time for multiple-input single-output (MISO) systems over Rayleigh flat fading channels assuming perfect channel state information...
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