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.
The performance of Global Navigation Satellite Systems (GNSS) is known to be severely affected in multipath scenarios, providing a biased position solution which could jeopardize possible geodetic-grade applications. Indeed, multipath estimation and/or mitigation has attracted the attention of many researchers in the recent years. Nevertheless, few attention has been given to the detection of multipath...
Estimation of Direction of Arrival (DOA) signal is one important function of adoptive antenna. The fuzzy angle in correlative signal environment of DOA estimation could seriously affect the estimation precision. Based on 1-D spatial smoothing theory the paper analyzes the algorithm for 2-D angle estimation in correlative source environment of hexagonal array and simulations were carried out. A method...
In this paper a novel approach is proposed for estimating the direction-of-departure (DOD) in a frequency-selective multipath channel, where both the transmitter (Tx) and receiver (Rx) employ an antenna array. In particular, the proposed approach exploits the cooperation between the Tx and Rx beamformers, such that the Tx beamformer rotates its mainlobe in a synchronized manner that is known to the...
According to the characteristics of feature difference of the data covariance matrix from uniform antenna array, the authors propose a new method of detecting the number of sources, this method can accurately estimate the number of sources in the following case of high degree of source coherences, and small difference between the incident angles. First, the antenna array data covariance matrix is...
We address adaptive detection of Swerling 2 pulse trains by an array of antennas. The disturbance is modeled in terms of a state space model and the ideas of subspace identification are used to come up with a GLRT-based detector. Such detector is compared by Monte Carlo simulation with a Kelly's detector derived assuming that returns are temporally uncorrelated (but spatially correlated) and that...
In this paper, a covariance-based algorithm with multiple antennas is proposed to eliminate the follower jamming for frequency hopping systems (FH) by finding the interference-blocking filter over quasi-static flat fading channels. The system uses the auto-covariance matrix of the received signal and M-array receive antennas. The simulation results show that the proposed approach can estimate the...
We consider the problem of estimating the parameters-the central direction of arrival (DOA) and angular spread of a coherently distributed source. This problem is encountered due to the presence of local scatterers in the vicinity of a transmitter or due to signals propagating through a random inhomogeneous medium. Since the computational complexity of the parameter estimation is normally highly demanding,...
Measurements of a wireless channel's spatial correlation guide the development of multi-antenna wireless systems that use spatial diversity. Representative spatial channel measurements are required to design these multi-antenna systems, but typical measurements of spatial correlation obtained by moving an antenna array through a wireless channel provide limited correlation data that cannot be generalized...
Cognitive radio (CR) is currently being seen as the future for wireless communications. Fundamental to the operation of a CR is the detection of presence of legacy communication. Energy detector (ED) is a simple and effective signal sensing method. However, the ED requires accurate estimation of the noise power. Any error in the estimation, which is common in practice, affects its performance. In...
This paper presents a method for high-resolution estimation of the angles of arrival of multiple narrowband plane waves. The technique bases on interpolation and virtual array from an array of sensors. The algorithm principle is presented, and followed by simulation examples. The basic idea of the proposed approach is to increase the number of sensors to virtually reducing the sensor spacing of the...
A new adaptive beamforming method for direct sequence code division multiple access (DS-CDMA) communication systems is proposed, which has low computational load. The proposed method needs only 2N+1 complex multiplications and 2N-1 complex additions, where N is the number of antennas in the array. We evaluate the performance of the proposed method in estimating the angle-of-arrival (AOA) of the desired...
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.