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.
Mitigating non-stationary narrowband interference from a continuous phase modulation (CPM) signal is a challenge due to the correlation present in CPM signal samples. For such a scenario, use of a time-varying linear prediction error filter (TVLPEF) based on a decorrelating time-varying autoregressive (DTVAR) model was proposed earlier. TVLPEF based mitigation of the interference from a CPM signal...
A novel method of estimating the range for localization in a interference limited wireless sensor network (WSN) is proposed in this paper. The received sensor signal indication (RSSI) algorithm is the most common algorithm for sensor range measurement, however in interference limited environments it is prone to erroneous estimation. Thus a non-parametric maximum likelihood (NPML) adaptive estimator...
In this paper an algorithm suitable to interference detection for terminal embedding commercial GNSS chipsets is presented. The algorithm monitors the value of the C/N0 estimated by the receiver for multiple channels and a detection rule is set in order to obtain the desired performance in terms of false alarm and detection probabilities.
Interference reduces the performance of a correct data signal detection and decoding. This problem becomes severe when interferences exist during the period of channel estimation. This will destroy the accuracy of channel estimation and, will eventually result severe degradation in the performance of signal detection and decoding in the entire data packet/frame. In this article, we propose an improved...
Wireless Personal Area Networks (WPANs) are used for a wide variety of applications. Earlier WPANs, like Bluetooth, offer data rates only for low rate communication. Nowadays, consumer electronic devices have high demands on communication systems, e.g. for high definition video transmission. Users expect future WPANs to act like wired systems by means of reliability, that is, packet loss and distortion...
Base on the results of FFT in OFDM demodulation, one new single frequency interference estimation scheme is proposed, which can estimate accurately the parameters of single frequency interference by analyzing two spectrum lines having higher energy than others. The complexity of the scheme is very low and its accuracy is much higher than that of the conventional scheme which using only single spectra...
The concept of small cells such as femtocells has been regarded as a promising solution to overcome the indoor coverage problem and deal with the growth of traffic within macrocells. However, the unpredictable deployment pattern of such cells makes centralized network planning impractical and requires more efficient interference management and distributed spectrum planning schemes to realize the benefit...
We develop a new SAR processor based on several orthogonal projections.We take into account the scattering properties of the target and the interferences by using subspace models. To detect the target without detecting the interferences, we process images from the orthogonal projection of the received signal into the target subspace and from the orthogonal projection of the received signal into a...
In-vehicle signal transmission requires dedicated communication cables such as twisted metal wires and optical fiber cables, which increase the weight and the volume of wiring harnesses in vehicles. Furthermore, the number of electronic control units (ECUs) and the other electronic devices in vehicles is increasing. As a result, in-vehicle networks are becoming more and more complex and unstable....
Previous packet length optimizations for sensor networks often employ a fixed optimal length scheme, while in this study we present DPLC, a Dynamic Packet Length Control scheme. To make DPLC more efficient in terms of channel utilization, we incorporate a lightweight and accurate link estimation method that captures both physical channel conditions and interferences. We further provide two easy-to-use...
Results of experimental estimation of interference impact of transmitting equipment of low bit-rate digital radio relay station (DRRS) on receive paths of land mobile service with joint use of radiofrequencies VHF and UHF are considered.
LS-EM algorithm can estimate Gaussian mixture autoregressive model (GMAR) parameter, which is one of the most efficient models for fitting PDF/PSD of non-Gaussian colored processes, especially interference background of detections. But its operation amount is too huge to be applied in real time. A modified LS-EM algorithm (MLS-EM) is proposed, which aborts the unnecessary feedback and coupling link...
Inter-cell interference (ICI) mitigation is always a big challenge issue in cellular systems. In this work we propose an enhanced fractional frequency reuse (EFFR) scheme combined with power allocation and an interference-aware reuse mechanism to achieve not only ICI limitation at cell edge but also enhancement of overall cell capacity in orthogonal frequency division multiple access (OFDMA) based...
The scarcity of the radio spectrum now encourages the use of cognitive radios so that highly sought frequency bands could be shared between a secondary and a primary (legacy) network. This paper presents a new interference estimation technique for a smart antenna equipped MANET (Mobile Ad hoc NETwork), acting as a secondary network, to estimate its interference to fixed primary network devices by...
A new interference estimation approach is presented for the underlay secondary spectrum sharing paradigm, which will increasingly become a necessity as a result of increasing wireless communication demands. Our scheme is especially designed to deal with very low communication between a smart antennas equipped secondary network and a primary (legacy) wireless network. Since only the primary antennas'...
Coexistence of different users in cognitive radio (CR) network sharing the same frequency band can cause severe in-band interference. In this paper, we propose a novel scheme of joint interference estimation and decoding to combat the narrowband interference for OFDM-based (orthogonal frequency division multiplexing) CR systems in an iterative way. Moreover, we present some complexity reduction techniques...
This paper proposes a new codebook-based SDMA scheme, which employs a variable number of active beams, i.e., a dynamic multiplexing order, to target a good tradeoff between the multiplexing gain and the inter-user interference. The new transmit scheme consist of a modification of the conventional feedback information and the development of a novel scheduling algorithm, where the new scheduling algorithm...
In many practical applications, noise is non-Gaussian. Heavy-tailed symmetric alpha-stable (SalphaS) distributions have been shown to describe well many natural phenomena and interference in radio engineering, acoustics, communications, etc. For processing signals corrupted by such noise, robust estimators and the corresponding techniques are widely applied. The methods based on a sample myriad (SM)...
Cognitive radios are slated to be the next generation of smart transceivers that can dynamically sense and respond to its immediate radio frequency (RF) environment. It is highly likely that the RF environment will vary with time as various interferers come and go out of the range of the target receiver. This leads to the interference at the receiver being impulsive in nature, which if not properly...
Unknown interference and colored noise which is called nonlinear interference here, reducing precision and reliability of system seriously, is ubiquitous in the complexity multi-antenna environment. A new approach, to estimate and detect signal in these multi-antenna systems, is introduced in this paper. Nonlinear interference is treated as a nonparametric component in the model and is estimated by...
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.