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The orthogonal frequency division multiplexing signals based on the offset quadrature amplitude modulation (OFDM/OQAM) with pulse shaping are cyclostationary. Utilization of the cyclostationarity provides significant advantages in detection, identification, synchronization, and parameter estimation of these signals. In this paper, a matrix-based, stochastic method for the cyclic spectral analysis...
This paper describes a joint detection and classification of OFDM/QAM, OFDM/OQAM and SC-FDMA signals, using their cyclic frequency domain profiles of spectral correlation density. Detection and classification are performed by introducing corresponding HMMs of these signals. Some performances of the considered joint detection and classification of these signals, obtained using software simulation models,...
This paper describes a joint detection and classification of OFDM/QAM and OFDM/OQAM signals using their cyclic frequency domain profiles of spectral correlation. Detection is threshold-based, and corresponding HMMs of these signals have been used for their classification. Some performances of the considered signal detection and classification, obtained using software simulation models, are shown,...
Some system aspects and research challenges and limitations of existing spectrum sensing techniques are highlighted and discussed. New concept of joint spatio-temporal spectrum sensing based on one-step direct localization methods, developed by authors as possible answer to given challenges, is shortly presented.
Integration of wideband joint spatio-temporal spectrum sensing in wireless cellular system (coherent and non-coherent variant) is proposed as preliminary innovative idea. It provides that cellular systems as licensed users should use unoccupied licensed frequency bands assigned to other licensed users. Such cognitive properties integrated in cellular systems should improve their performances both...
An approach for fine determination of transmitting antenna positions in distributed antenna system used for UWB indoor self-localization is proposed. Proposed solution is based on the ranging of the transmitting antennas by the use of the high-resolution MUSIC based method developed by authors for UWB self-localization. Performances of the proposed solution are illustrated by experimental results...
The localisation of wideband signals emitters can be performed using one-step techniques. Most of the one-step techniques or direct position determination methods are based on the spectral correlation matrix estimation. In order to improve accuracy of the emitter localisation, we investigate two approaches: coherent and noncoherent direct position determination of wideband signals. Using these two...
A new, matrix-based, stochastic method for cyclic spectral analysis of MB-OFDM signals, based on their Markov chain representation, is proposed. Explicit expression for the cyclic spectrum of these signals is derived. Some theoretical and simulation results for the spectral correlation characterization of MB-OFDM signals are presented, as well.
In this paper we consider the development of wideband direction finder for VHF/UHF frequency band, taking into account the number of antenna elements in the antenna array, and the number of RF channels in the wideband receivers. Two variants of the wideband direction finder have been considered. In the first case, the number of RF channels is equal to number of antenna elements in the antenna array...
This paper shows possibilities of cyclostationary analysis of wideband signal used in impulse radio systems. The cyclostationary analysis is introduced in order to estimate parameters of wideband signals, for synchronization purposes and for impulse radio system settings of both transmitting and receiving block. The simulations have shown that using cyclostationary analysis is possible to estimate...
Cyclic spectral analysis of OFDM/OQAM signals with cyclostationary signature is performed by the proposed matrix-based stochastic method based on their Markov chain representation. An exact expression for the cyclic spectrum of these signals is derived, and the corresponding cyclic features are analyzed.∗
In this paper, we propose a one-step signal selective direct position algorithm of wideband cyclostationary signals. The proposed algorithm for signal selective direct positioning determination is based on estimation of spectral cyclic correlation matrix in frequency domain and it does not require any knowledge of the optimal time lag parameter which appears in the similar algorithms in time domain...
A new method for direct self-localization of IR UWB nodes in indoor scenarios is proposed. The localization system consists of a reference node with synchronized spatially distributed antennas that transmit the same UWB impulse sequence used for self-localization. The nodes that perform selflocalization have perfect knowledge of antenna locations and UWB impulse waveform. The superposition of the...
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