The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Automatic modulation classification (AMC) conducted by a single receiver plays a crucial role in spectrum monitoring and signal interception. To improve the accuracy of feature based AMC, a novel multi-cumulant based modulation classification scheme using uniform linear array is proposed in this paper. Moreover, two methods are formulated to combine the signal from different antenna branches, i.e...
This paper presents the performance of V-BLAST and STBC on MIMO-OFDM.V-BLAST is superior in terms of spectral efficiency and bit error rate. The performance analysis of V-BLAST based multiple input multiple output orthogonal frequency division multiplexing (MIMO-OFDM) system also analyzed with respect to bit error rate per signal to noise ratio (BER/SNR) for various detection techniques i.e. zero...
Recently, the idea of regularization received a lot of interest in signal processing with ill-conditioned problems. In this paper, instead of using the traditional sphere decoding (LSD) technique, regularized LSD detection techniques have been used for block data transmission systems (BDTS). The first regularization scheme that has been used is Tikhonov regularization (L2-regularization) which is...
Heterogeneous Networks deployment is considered one of the most promising enhancements to support future network capacity requests. However, access points densification means high frequency reuse and requires efficient interference management policies. This paper considers a coordinated scheduling/coordinated beamforming approach to deal with the intercell interference, and proposes optimal and heuristic...
In this paper, we study the density evolution analysis of spatially coupled low-density parity-check (SC-LDPC) codes over binary input additive white Gaussian noise (BIAWGN) channels under the belief propagation (BP) decoding algorithm. Using reciprocal channel approximation and Gaussian approximation, we propose averaging techniques for the density evolution of SC-LDPC codes over BIAWGN channels...
We investigate the optimal power and rate allocation for multilayer transmission using the broadcast approach over a fading amplify-and-forward relay channel. The source uses multilayer source coding with successive refinement where the layers are transmitted using superposition coding at the source with optimal rate and power allocation. The destination applies successive interference cancellation...
Directional communication is a key element in the sustenance of high data rate links in millimeter wave communications, and can be realized using antenna beamforming. To reduce training overhead and establish a reliable link in indoor millimeter wave communications, the beam switching technique is adopted with an objective to identify the optimal transmit-receive beam pair that maximizes the signal-to-noise...
Scarcity of the radio frequency spectrum available for use by the vast number of wireless devices is already a challenge faced by ubiquitous communication networks, including the Internet of Things. The Cognitive Radio (CR) technology provides promising solutions to address part of such challenges. CR is based on allowing the so-called holes, the spectrums that remain unoccupied by their licensed...
A hybrid direct sequence and frequency hopping (DSFH) spread spectrum signal can greatly improve ranging precision and jamming resisting capability in spacecraft TT and C (Tracking, Telemetry and Command). The frequency hopping adds another searching dimension to acquisition and increases the acquisition complexity. Therefore, this paper designs a phase-compensating-based acquisition algorithm. First,...
This paper focuses on coordinated multicell multicast transmissions in Heterogeneous Networks (HetNets). In particular the HetNet Multicast Problem (HMP) is formulated, whose goal is to to improve the quality of the multicast service by maximizing signal to noise ratio (SNR) of the user with the worst channel conditions, but taking into account the energy consumption issue. Indeed, the small cells...
This paper deals with the performance evaluation of a cognitive overlay wireless sensor network relying on a low complexity spectrum sensing technique. In particular, the paper proposes a dynamic channels selection policy in order to improve the performance of a IEEE 802.15.4e sensor overlay network. Further, the paper proposes a suitable analytic model to carry out a performance evaluation analysis,...
In this paper, we provides a comparison of low-complexity MIMO detector, including linear MMSE receiver with a capacity-approaching channel code. The impact of soft-decision provided by MIMO detection plays an important role especially when using capacity-approaching codes. Here, our focus is on linear MMSE receiver with soft-decision output, a.k.a., log-likelihood ratio, and its approximate version...
In recent years, a number of works have studied methods for computing the Fourier transform in sub linear time if the output is sparse. Most of these have focused on the discrete setting, even though in many applications the input signal is continuous and naive discretization significantly worsens the sparsity level. We present an algorithm for robustly computing sparse Fourier transforms in the continuous...
This paper addresses the issue of UWB signal acquisition in the context of wireless powered UWB RFID systems. In this scenario, the data transmission is based on short packet so as to meet the micro-power budget of autonomous power harvesting. The burst short packet transmission as well as the low duty cycling UWB pulse modulation places a stringent challenge at the UWB receiver for timing acquisition...
We propose a low-complexity decoding message truncation technique for nonbinary LDPC decoders by exploiting the extended min-sum algorithm. The proposed technique dynamically adjusts the decoding message length according to channel conditions, thereby reducing the decoding complexity while conforming to the desired level of decoding performance. Utilizing the proposed technique, the decoding operations...
Sparse code multiple access (SCMA) is a new frequency domain non-orthogonal multiple-access technique which can make full use of limited spectrum resources in wireless communication system. In SCMA, multiple users share the same time-frequency resources of orthogonal frequency division multiple access (OFDMA). However, message passing algorithm (MPA) is used in the process of SCMA decoding. And when...
A new type of recursive soft sequential estimation (RSSE) algorithm is presented. The algorithm can be used for fast initial synchronization of pseudonoise (PN) signals based on m-sequences. The key feature of the algorithm is the grouping of binary symbols and the reception of the group as a whole symbol. Different numbers of binary symbols in the group lead to different estimation algorithms in...
New phase transition phenomena have recently been discovered for the stochastic block model, for the special case of two non-overlapping symmetric communities. This gives raise in particular to new algorithmic challenges driven by the thresholds. This paper investigates whether a general phenomenon takes place for multiple communities, without imposing symmetry. In the general stochastic block model...
Own method of embedding information in still pictures was synthesized. New algorithm used additional blocks of cropping and stability under the previous image processing. This ensured the reliability of the system and increased the probability of correct recognition of embedded data. The complex analysis of the most relevant data hiding methods by multiobjective optimization was done. Also the comparative...
From many electronics, an unexpected noise is generated. An impulsive noise or non-Gaussian noise has been announced as appropriate model for abrupt strong interference, now that the noise is observed as impulsive property. Founded on these models, many researchers have tried to find a solution to prevent a performance degradation, because the impulsive noise severely interferes with detecting a transmitted...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.