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The results of minimum variance (MVDR) algorithm map to the signal subspace to get the weighted coefficients based on feature subspace theory, In the low SNR environment, there will be the main lobe offset, waveform distortion, serious decline in the performance of beamforming. This paper puts forward an improved method for the emergence of this kind of situation. Using the principle of correlation...
Virtualization technology has been widely adoptedin Cloud data centers for adaptive resource provisioning. Withvirtualization, multiple virtual machines (VMs) can be colocatedon a single physical host to yield maximum efficiency. However, VMs which show high CPU utilization correlationsto other co-located peers are more likely to trigger overloadingincidents. This work provides an analysis on effects...
This work demonstrates the propagation and dynamic manipulation of composite vortex beams through an underwater turbid environment. These profiles are generated through the coherent superposition of several different optical orbital-angular momentum modes using a 543.5 nm HeNe laser with a coherence length of 58.5 mm. The spatial coherence is maintained after propagation through 0.508 m of water with...
When SSDs are used for in-situ execution of data-intensive scientific workflows, it is challenging to obtain consistently high I/O throughput because its I/O efficiency can be compromised for serving write and read requests simultaneously. This issue is so-called write-read interference. In this paper, we propose a novel scheme named FlashStager, which can isolate writes from reads using write redirection...
The superframing option of the recent DVB-S2X standard specifies, for the so-called SF-Pilot fields, the use of the orthogonal set of Walsh-Hadamard (WH) sequences. In order to exploit this orthogonality, waveforms coming from different beams to the k-th User Terminal (UT) should be quasi perfectly aligned in time. While in the downlink part of a terrestrial system this is quite straightforward, in...
Several random access (RA) techniques have been proposed recently for the satellite return link. The main objective of these techniques is to resolve packets collisions in order to enhance the limited throughput of traditional RA schemes. In this context, Multi-Replica Decoding using Correlation based Localisation (MARSALA) has been introduced and has shown good performance with DVB-RCS2 coding scheme...
The version of the modification of the classic bearing Capon's algorithm is presented to determine the position (the bearing and the distance) of the sources of radiation and their subsequent spatial selection as in the far and in the near and intermediate wave zones of the antenna array for analysis by the monitoring system.
Spectrum sensing is a key component in cognitive radio networks, which allows secondary users to communicate without causing harmful interference to primary users. Cyclostationary feature based spectrum sensing has proven preferable to other methods under low signal-to-noise ratio conditions. To detect the presence of primary signals, conventional cyclostationary feature based schemes tend to simply...
BS (Base Station) cooperation schemes allow for an improved overall system's capacity and spectral efficiency. This is due to the possibility of MTs (Mobile Terminals) in adjacent cells sharing the same physical channel. The BSs send a quantized version of the received signals to a central unit that performs the separation of the signals associated to different MTs. In this paper we consider the uplink...
This paper presents experimental results of our proposed null-space expansion scheme for multiuser massive MIMO in time varying channel. Multiuser MIMO transmission with proposed scheme can suppress inter-user interference (IUI) caused by outdated channel state information (CSI). The excess degrees of freedom (DoFs) of massive MIMO is exploited to perform additional null-steering...
Widely linear (WL) receivers can fulfill single antenna interference cancellation (SAIC) of one rectilinear (R) or quasi-rectilinear (QR) co-channel interference (CCI). The SAIC technology for QR signals has been shown to be less powerful than SAIC for R signals. To overcome this limitation, a SAIC/MAIC enhancement using three-inputs WL frequency-shift (FRESH) receiver has been introduced for QR signals...
In this paper we look into the test methods to evaluate the quality of audio separation algorithms. Specifically we try to correlate the results of listening tests with state-of-the-art objective measures. To this end, the quality of the harmonic signals obtained with two harmonic-percussive separation algorithms was evaluated with BSS_Eval, PEASS and via listening tests. A correlation analysis was...
Massive MIMO is a promising technology for the 5G mobile communications system and contributes to the enhancement of multi-user MIMO transmission. However, the user scheduling of multi-user MIMO transmission requires a high computational complexity because the matrix operation is performed to estimate SINR, which is used as a user selection criterion. In this paper, we investigate low complexity multi-user...
Internet of Things (IoT) is founded on the unprecedented proliferation of heterogeneous wireless technologies. However, dense deployment of such devices intensify the interference, which has become a major cause of performance degradation. This paper first introduces schemes for harmonious coexistence. Our designs effectively enhance diverse existing protocols via a complementing middle layer that...
Direct sequence spread spectrum (DSSS) is an optimal mode of coding for data communication. Spread spectrum coding were used in various communication modes, which gives an advantage of channel interference minimization, with maximum spectrum utilization. With the simplicity in coding efficiency, this coding approach was most effectively used in various application of data exchange. However, with the...
In this paper a new interference mitigation scheme with resource control is proposed, to achieve the objective of higher performance in MIMO system, using interference conditions. A generic approach for both coordinated and randomized multi-user access strategies for interference mitigation is proposed. The suggestive analytical framework develops the correlation of fading channel over the space-frequency...
Massive Multi Input and Multi Output (M-MIMO) is the most prominent technology to improve the spectral and energy efficiency of future wireless systems by deploying multiple number of antennas at the base station. In this letter, we considered the impact of spatially correlation on massive MIMO downlink systems with achievable data rate in the block fading environment. The proposed schemes exploit...
SAR complex image registration is one of the key steps of the interferometirc SAR and tomographic SAR. The complex correlation function based method is an common registration method. Generally in the application, the adopted SAR complex image is large width, however, the complex correlation functions of registration accuracy can only be guaranteed the high precision of a small scale registration in...
UWB based on chirp waveforms has the advantages of low cost, low power consumption and high processing gain. A multiple access UWB system based on multi-chirp waveforms is proposed[ Sponsored by Tianjin science and technology planning project(No:13ZCZDSY20100)], which enables the system to gain merits of both IR-UWB and OFDM-UWB. System performance for multi-user UWB using multi-chirp waveforms is...
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