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Today, energy spectrum is in high demand as the usage of the spectrum increase day by day at a tremendous rate; there is a need to find a way to efficiently utilize these scarce resources, cognitive radio is a huge step towards this. An enormous research papers have been published in various international conferences as well as journals in the last few years to make cognitive radio applicable with...
This paper derives the closed-form bit-error-rate (BER) expression for multiple-input multiple-output (MIMO) system with impulsive noise by using bi-parameter Cauchy-Gaussian mixture approximation. So far, little research has been investigated on analyzing MIMO system with impulsive noise, because the closed-form of the probability density function (pdf) of the impulsive noise does not exist except...
In this paper, we propose an extended semidefinite-relaxation (SDR) method for multiple-input multiple-output (MIMO) detection of high-order QAM signals. In the proposed method, high-order QAM constellations are represented by an equivalent virtually-antipodal form. Based on this form, the alphabet relaxation components in the existing SDR formulation can be constrained to the original alphabet set...
For a conventional time-hopping impulse-radio (TH-IR) system, all the pulses corresponding to the same information symbol are transmitted with the same sign. In this paper, we consider a slightly modified TH-IR system in which each user will be assigned a randomly generated binary sequence that modulates the transmitted pulses. We further present a detector based on the likelihood ascent search algorithm...
Linear equalizers (LEs) have been widely adopted for practical systems due to their low computational complexity. However, it is also well known that LEs provide inferior performance relative to a maximum-likelihood equalizer (MLE) or other near-MLEs, because LEs usually cannot collect the diversity order enabled by the transmitter and at the same time they lose mutual information. More importantly,...
In this paper, we propose a robust STBC transmission scheme to combat the timing synchronization errors over frequency-selective multiple-access channels. First, the equivalent channel model in the presence of timing synchronization errors is derived and we find that the synchronization errors result in an equivalent channel model with larger number of correlated channel taps. Based on this correlated...
Orthogonal frequency division multiplexing (OFDM) is the modulation scheme of choice for digital video broadcasting-handheld (DVB-H), which is required to operate under high mobility conditions resulting in significant Inter-carrier Interference (ICI). To mitigate ICI, several cancellation schemes have been proposed but they require reliable channel information at the receiver which is quite challenging...
Orthogonal frequency division multiplexing (OFDM) is the modulation scheme of choice for digital video broadcasting-handheld (DVB-H) which is required to operate under high mobility conditions resulting in significant Inter-Carrier Interference (ICI). Under these conditions, the conventional one-tap per subcarrier channel estimation and equalization is suboptimal since it does not account for ICI...
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