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Global Navigation Satellite System Reflectometry (GNSS-R) was regarded as a promising way to observe atmospheric duct by utilizing low elevation angle ocean surface reflected signals. To invest the Delay maps' feature of low elevation angle reflected signals in the atmospheric duct, a shipborne GNSS-R campaign was conducted in July, 2015 by the scientific investigation ship called Shiyan 3 on the...
The time delay estimation of the TDOA is signification in passive source localization systems, and the estimation accuracy may directly affect the source location performance. We address the problem of passive blind estimation of time-delay for uncorrelated co-frequency interference source signal based on wireless sensor network (WSN). The received mixtures are modeled as unknown linear combinations...
High frequency (HF) band covers frequencies between 3–30 MHz. With wavelengths of 10–100 m, HF band enables communications over a very long distances though a skywave propagation. As HF band has several benefits like versatility and large coverage area, it suffers phenomena like rapidly changing environment and strong interference. The cognitive radio concept which adapts to the changes in the environment...
We consider the single user detection of signal in the spread spectrum communication system used for high mobility applications. Due to the complexity of initial phase estimation differential phase shift keying (DPSK) is employed. The performance of the linear correlation algorithm and the sign algorithm in the presence of additive Gaussian noise, multipath interference and high power external interference...
The paper analyzes the joint performance of the PLL and DLL blocks that constitute the conventional receiver for Galileo AltBOC(15,10) signals, in the presence of narrow band (sinusoidal) and wideband (periodic chirp) interference. Full-band and sub-band processing are considered. The simulation results are compared with the expected behavior determined by the computation of the spectral separation...
Civilian GNSS signals are highly vulnerable to structural interference due to publicly known signal structure and lack of encryption. This type of interference includes counterfeit GNSS like signals that are designed to deceive target GNSS receivers without being detected. A synchronized structural interference signal can mislead the tracking process of a receiver which may lead to the generation...
The paper investigates a problem of increasing convergence rate for the process of adaptive weight vector adjustment in spatially reconfigurable antenna systems on the background of point-source interferences. It is shown that pre-processing with adjustment of adaptive antenna array element spacing gives the capability to reduce considerably eigenvalues spread of spatial correlation matrix and to...
Spectrum sensing is a key component in any cognitive radio network. Recently full-duplex communication, i.e., the ability to transmit and receive at the same time at the same frequency, has become feasible. Residual self interference is inevitable even after applying self interference cancellation techniques in radio frequency (RF) and baseband domains. In this paper, we study the performance of popular...
The concurrent deployment of heterogeneous wireless networks such as Wi-Fi, Bluetooth, and ZigBee has led to the severe interference problems in the 2.4GHz ISM band. In particular, ZigBee networks are susceptible to the interferences from other wireless technologies; For example, strong Wi-Fi signals trigger false alarms to ZigBee device that is performing low power idle listening and cause appreciable...
A block sparse Bayesian learning (BSBL) based approach of narrowband interference (NBI) cancellation for cyclic prefixed orthogonal frequency division multiplexing based smart grid communications is proposed in this paper. The BSBL theory is firstly introduced to recover the practical block sparse NBI with a frequency offset compared with the sub-carriers. The block sparse representation of the NBI...
In this paper, considering the scenario that the available channel state information (CSI) used for relay selection (RS) is outdated, we propose a RS scheme for full-duplex (FD) cooperative networks in an interference-limited environment, where the residual loop interference (RLI) at the relay and the interference comes from the direct link both affect the cooperative transmission. Specifically, based...
In this paper, the parameters estimation for the interference rejection combining (IRC) technique with the inter-cell interference (ICI) and narrowband interference (NBI) in single-carrier frequency-division multiple access (SC-FDMA) systems is considered. Due to the characteristics of the interferences in uplink SC-FDMA systems is quite different from that in downlink orthogonal frequency-division...
A digital chaotic radar scheme that can be used in bistatic configuration is proposed. The generation of the transmitted AM signal and all post-processing are performed digitally. The proposed methodology is simulated and then validated with an anechoic chamber test. Results indicate that chaotic AM signals have autocorrelation sidelobe levels below −20 dB. The methodology was evaluated at two bandwidths,...
In this paper, we study influences that affect interference immunity of ultra-wideband (UWB) short-pulse radio communication systems and assess the degree of influence by modeling operation of radio communication system in different modes for two types of channels. The approach to modeling the UWB communication system is described.
A general framework for the analysis of expected per-user signal-to-interference-plus-noise-ratio (SINR) of a multiuser multiple-input-multiple-output system is presented. Our analysis assumes spatially correlated Rayleigh fading channels with regularized zero-forcing precoding on the downlink. Unlike previous works, our analytical expressions are averaged over the eigenvalue densities of the complex...
In this paper, we propose an eigen domain transmission scheme (ETS) to establish reliable and effective communication for multiple-input-multiple-output (MIMO) systems suffering from narrowband interference (NBI). At the transmitter, assuming that the statistical information of the NBI is known, a precoding is developed to divide the channel into multiple subchannels in the eigen domain of the NBI...
Improving antenna arrays characteristics such as power consumption, cost and complexity has gained wide attention in the context of cognitive radio networks. One antenna array configuration that offers great potential is the electronically-steerable parasitic array radiator (ESPAR) antenna. In this paper, we propose a transmitter patch ESPAR antenna system for underlay spectrum sharing in cognitive...
Weighted autocorrelation receivers have been proposed in the literature to suppress noise or interference for transmitted reference ultra-wideband communication systems. Usually weight optimization is performed for partitioned integration bins. To improve the optimization effect, this paper proposes a digital weighted autocorrelation receiver, in which the sampled auto-correlated signal is first rearranged...
Wireless technology has become an invaluable facilitator in many aspects of daily life. Healthcare environments in particular have gained noticeable agility and flexibility by integrating wireless functionality into various medical equipment. As of late, chipsets designed to implement communication standards in the Industrial, Scientific and Medical (ISM) band have become inexpensive and widely available,...
Channel correlation between different users can significantly deteriorate the energy and spectral efficiency of massive MIMO systems. As such, it is tempting to separate the highly correlated users in order to reduce intra-cell interference to improve the overall system performance. In this respect, and unlike existing work, we propose an adaptive user grouping algorithm for the downlink of multiuser...
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