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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...
By combining the polarized modulation and the spatial modulation technique, dual-polarized spatial modulation (DPSM) has been recently proposed for MIMO transmission to improve the spectral efficiency and reduce the space occupancy. The performance of DPSM over correlated Rayleigh and Rice fading channels has been studied, showing that DPSM technique outperforms uni-polarized SM technique. For a general...
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...
Nowadays the Massive MIMO system is one of the keys for obtaining high quality and reliability of data transmission. One of the main characteristics influencing the MIMO system performance is the channel (system) correlation matrix (CM). The proposed research assumes an exponential-type banded CM structure, which is bridging the gap between fully correlated and uncorrelated/weakly correlated (tridiagonal...
In this paper, we describe a modified signal design for Multistream Spatial Modulation (MSM). The fundamental idea behind MSM is to activate multiple antennas and transmit complex symbols along with active antenna indices. Here, a modified MSM technique explicitly designed to combat the effect of spatial correlation in realistic channel scenarios is proposed. In this MSM scheme, two antennas are made...
The sum rate performance of distributed multiple-input multiple-output (D-MIMO) systems with Zero-Forcing (ZF) receivers over semi-correlated K fading channels involves special functions, which hinders us to further manipulations. To solve this issue, we derive the closed-form expressions of the achievable sum rate by using moment matching method, which is achieved by using a Gamma distribution to...
In this paper, the measurement results of field experiments for correlation reduction precoding with a repetition code in an overloaded MIMO systems are presented. Measurements are conducted in three propagation conditions that are line-of-sight (LOS), non-line-of- sight (NLOS), and a mobile environment. Numerical results obtained through the measurements show that amplitude shift and phase rotation...
Recently, massive multiple-input multiple-output (MIMO) systems have attracted considerable research interest and have been regarded as a candidate technology for the 5th generation (5G) cellular networks. In massive MIMO systems, a base station (BS) is equipped with a large number of antennas which are serving several simultaneous single antenna users. An increasing number of antennas is difficult...
Massive MIMO (m-MIMO) schemes operating at mmWave bands are being proposed to be used in next generation wireless systems, bringing new challenges both in terms of detection techniques and the definition of channel models. In this paper, frequency-domain iterative detection schemes which do not require matrix inversions and are suitable for m-MIMO systems employing Single- Carrier with Frequency-Domain...
Massive multiple-input multiple-output (Massive MIMO) is acknowledged as a key technology for the 5th generation (5G) of wireless communication systems, which theoretically proved to be of higher throughput, better robustness, superior spectrum- and energy- efficiency. A reliable and realistic channel model serves is the enabling foundation for practical design and testing of communication systems...
This paper presents outdoor wideband small-scale spatial fading and autocorrelation measurements and results in the 73 GHz millimeter-wave (mmWave) band conducted in downtown Brooklyn, New York. Both directional and omnidirectional receiver (RX) antennas are studied. Two pairs of transmitter (TX) and RX locations were tested with one line-of-sight (LOS) and one non-line-of-sight (NLOS) environment,...
Transmit antenna selection (TAS) schemes have been adopted in various communication systems to provide improved performance with relatively reduced complexity. The quality-of-service (QoS) in these systems depends on the availability of perfect channel state information (CSI). In practice, it is difficult to acquire perfect CSI, since it may get outdated due to feedback process. In this paper, we...
The correlation between signals received on multiple antennas is a function of the channel(s) between them, and analysis of this is useful for spatial diversity and spatial multiplexing. In this paper we compute the correlations in both the spatial and frequency domains for a classical two-ray channel in a SIMO setting for an air-ground setting. We analyze this for the “pure” (deterministic) two-ray...
There has been increasing demand for precise positioning from Global Positioning System (GPS) satellites, particularly in fading environments that are challenging for the autonomous and semi-autonomous vehicle. GPS signals are right hand circularly polarized (RHCP) however, in dense multipath environments the polarization of a GPS signal may change to become left hand circularly polarized (LHCP)....
Cardiovascular vital signs are measured using continuous wave (CW) radar at 2.45GHz with a body-contact antenna. Using a previously collected database of thirty second recordings at paced breathing conditions, CW radar signals were measured together with heart sounds, electrocardiogram (ECG), respiration and impedance cardiogram (ICG) were as reference signals. Using arbitrarily chosen features from...
Canonical correlation analysis is a powerful statistical tool to measure the relationship between two sets of variables. This paper proposes an algorithm that combines multi-cycle cyclostationary spectrum sensing technique and the canonical correlation analysis tool. The proposed algorithm can be applied to both multiple antenna systems and single antenna systems. The probability of detection of this...
More and more radio systems are incorporated in modern automobiles e.g. multiple mobile communication standards for car-to-car or car-to-infrastructure communications like LTE, ITS G5, satellite navigation, radar detection, and so on. Due to the intimate relation between wireless information and the automotive state of operation, these complex systems need to be tested extensively and under realistic...
This work investigates the antenna mutual coupling effect on multiple-input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) systems with oscillator phase noises. Since the antenna correlation when taking the mutual coupling effect into account is smaller than that when the mutual coupling effect is omitted, it is shown that, at small antenna separations, the error rate performance...
A realistic stochastic multiple-input multiple-output (MIMO) channel is presented in this paper. It is shown that the spatial correlation depends on the statistical properties of the channel, the antenna pattern, the inter-element spacing and the array configuration. Furthermore, the total spatial correlation matrix is equal to the Kronecker product of the transmit and receive correlation matrices...
This paper describes a novel method for the measurement of the frequency response of the indoor RF propagation channel utilizing an HP network analyzer. Preliminary measurements of the frequency response of the channel in the frequency bands 900–1000MHz and 1.6–1.8GHz are reported. These measurements determine the dependence of the rms excess delay time on the separation between the transmitting and...
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