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The radio holography method performs the direction-of-arrival (DOA) estimation of radio waves with a relatively simple array system because it uses a reference antenna. This paper proposes a new radio holography method in which cyclic correlations of digital-modulation signals are introduced for the DOA estimation of desired signals only. The DOA estimation accuracy of the method is evaluated by computer...
The Over-The-Horizon (OTH) locating of radiation source can be realized by the troposcatter propagation of electromagnetic (EM) signals. This paper studies the troposcatter signal group delay for target ranging and proposes a modified beamspace MUSIC to estimate the arrival azimuth angle of the troposcatter signal. Finally, the OTH target can be located by the ranging and azimuth angle estimation...
The Direction of Arrival (DOA) algorithms can estimate the incident angles of all the received signals impinging on the array. These algorithms give the DOAs of all the relevant signals of the user sources and interference sources. However, they are not capable of distinguish and identify which one is the direction of the desired user. In this paper, we propose to use a reference signal which is known...
Phased arrays can be used to estimate the direction-of-arrival (DOA) of UHF RFID tags. To save on energy consumption and hardware costs, in this paper we explore the possibility of using single bit analog-to-digital converters for our phased array setup. This setup consists of an off-the-shelf Impinj R2000 reader and a custom phased array with 4 receiving channels. The proposed system quantizes the...
Using techniques such as spatial division multiplexing (SDM), transmit beamforming, and space-time block coding (STBC), MIMO systems like IEEE 802.11n are conceived to increase dramatically throughput or to improve the reception range. Nevertheless, MIMO equipment in an indoor environment shows that the power level received in non-noisy conditions is not sufficient to explain the throughput variations...
By using the Time-Difference-of-Arrival (TDOA) of UWB-IR waveforms at multiple antennas, the position of a transmitting tag can be accurately estimated for high precision positioning applications. Several methods can be used to obtain the TDOA information based on the knowledge of the received waveforms at the antennas. The performance of the various methods however depend on the quality of the received...
It has been proved that in an uncorrelated condition, the capacity of MIMO system will linearly increase with the minimum number of transmitter and receiver antennas. However, the practical capacity of Multiple-Antenna system may vary because of the existence of spatial-temporal correlation. Factors such as Antennas Spacing, Angular Spread, Power Angular Spectrum, Mean Angle-Of-Arrival, Multiple Clusters,...
In this paper, we propose a novel DOA estimation technique for broadband signals using a single UWB antenna inspired by the human auditory system. The received spectra of the UWB antenna are incident angle dependent in the x-y, x-z and y-z planes. The estimated DOA is then obtained by evaluating the correlation coefficients of the measured spectra with pre-determined incident angle dependent spectra...
In this paper we investigate the impact of fading correlation at the receiving elements of a compact antenna array in a relay assisted cooperative scheme in single-input multiple-output (SIMO) configuration with one or multiple relays operating in amplify-and-forward mode. We assume that the source and the relay terminals are each equipped with one antenna, while the destination terminal is equipped...
The paper reports on the performances of training-based channel estimation methods in a multiple input multiple output (MIMO) communication system with transmitter equipped with a uniform linear array (ULA) and receiver equipped with either uniform circular array (UCA) or uniform linear array (ULA). In the undertaken investigations, the receiver is assumed to be free from any obstacles while the transmitter...
Motorola has developed a 20 MHz experimental wide-area mobile multi-antenna system at 3.5 GHz for characterizing the spatial channel. With this system, simultaneous channel measurements were taken using both a uniform linear array (ULA) and an array of two cross-polarized (XP) antennas for locations near the Motorola Schaumburg campus. The ULA consists of eight vertically-polarized elements with half...
A hybrid electromagnetic-statistic approach for the detection and localization of buried perfectly-conducting circular cylinders is presented. The data used for simulating the scenario are produced by using the cylindrical wave approach (CWA) method. The inverse scattering problem is treated by means of a statistical detection technique. In particular, by the use of a SAP (sub-array processing) structure,...
In this paper, a new wideband multiple-input multiple-output (MIMO) fading channel model for vehicle-to-vehicle (V2V) communications is proposed. The MIMO V2V channel model, called for brevity T-model, captures the propagation effects that occur if vehicles move towards a junction with a side road and corner buildings. The starting point for the derivation of the T-model is a new geometric T-junction...
This paper presents a multiple-input multiple-output (MIMO) space-time geometrical channel model with hyperbolically distributed scatterers for a macrocell mobile environment. The model is based on a one-ring scattering assumption. This MIMO model provides statistics of the time of arrival (TOA) and direction of arrival (DOA). It is assumed that there is no line of sight (LOS) between the transmitter...
The difficulty for accurate determination of the angles of arrival (AOA) of signals arises from the optimization of likelihood functions of high dimension. Usually, a gradient-based technique is employed to find the optimum of the function. However, this method requires heavy computational work and the differentiability of the likelihood function. This paper presents two gradient-free methods: One...
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