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.
This paper describes a successive multiuser detection technique for Direct Sequence Code Division Multiple Access (DS-CDMA) systems. In conventional CDMA system, single-user detection is employed, so that the interference between users or multiple access interference (MAI) component is considered as noise, which contributes to the statistics of detection variables affecting the quality of detection...
High Altitude Platform can provide mobile telecommuncication service to on-ground customers. This paper explains the behaviour of LTE network in a situation, where the service is being provided by HAP and eNodeB in a disaster scenario. In the disaster scenario, a set of adjacent eNodeB in the middle of Bandung city has been disabled. A HAP station has been launched to the disaster location to provide...
In modern electronic countermeasures, in order to interfere the normal work of reconnaissance receiver, the electronic jammer is usually used. For the wideband noise signal emitted by the jammer, the novel direction finding and localization algorithms are presented. In the direction finding(DF) algorithm, the time delay estimation is converted to the frequency estimation. The algorithm is not limited...
An improved algorithm is presented for speech enhancement via sparse representation and ideal binary mask (IBM) methods. In the traditional IBM, the basic idea is to identify voiced components as target signal and label unvoiced ones as interference noise vice versa. However, such voiced and unvoiced components still cannot be well separated in target signal and interference noise. To fully exploit...
Single-array and multiple-array structures were applied to a large-scale planar array for use in uplink space-division multiple access, and their simulated data throughputs were compared. In both structures, a subarray-processing iterative soft-input-soft-output multi-user detector efficiently recovers multi-user signals from multiple RF chains. The phased-array directivity is controlled on the basis...
Bit-error probability (BEP) of a digital communication system subjected to interference can be approximately derived from the amplitude probability distribution (APD) of the interfering signal. In this paper, it is pointed out that the approximation underestimates maximum BEP of a multilevel modulation scheme when the interference is impulsive, which is undesirable in regard to setting emission limits...
Co-location of frequency hopping systems occurs both in civilian and military applications. For close co-location in such scenarios, out-of-band emissions can be of significant importance and therefore have to be considered in the analysis. Intersystem-interference analysis of scenarios with several systems using a large amount of frequencies can be complex and time consuming if one wishes to consider...
In order to evaluate the immunity of DVB signal to external interferer we made some measurements and comparisons between DVB-T signal and DVB-C signal of 8 MHz bandwidth subject to a FM interferer.
In the recent years, power line communication technology has seen a rapid development. However, due to the unsteadiness of the power line channels, there are still some problems of obstruction and attenuation in this field which decrease the prospect and scope of this technology. This paper which is based on previous basic studies about spread spectrum communication and OFDM (orthogonal frequency-division...
Dereverberation for multichannel hearing aids is still a field of extensive research. If a single desired source is assumed, many binaural spatial filtering techniques such as the minimum variance distortionless response beamformer or the rank-one multichannel Wiener filter (MWF) distort the binaural cues of the residual undesired signal components. A recently proposed spatial filter minimizes the...
A microphone array post-filter design effective in various noise environments is proposed for implementation in a hands-free speech interface. Although various post-filter designs have been studied, few methods have been effective in practical use since different types of sound sources, such as spatially coherent target/interference sources and incoherent background noise, are included in the observation...
Study of anti-jamming effects on the Joint Tactical Information Distribution System (JTIDS) operating in the complicated electromagnetic environment is carried out in this paper. With the help of Simulink simulation platform of MATLAB, the JTIDS model is built up using channel coding, spread spectrum and modulation technologies. It is shown that, with some interferences introduced into the system,...
Code division multiple access (CDMA) is one of the promising techniques in cellular mobile communications system used for radio accessing and personal communication systems. Besides several practical advantages, CDMA suffers with multiuser interference, limiting the spectral efficiency drastically. There are various optimal and suboptimal multi user detection techniques in CDMA to overcome this problem...
This paper introduces filter bank multicarrier (FBMC) as a potential candidate in the application of massive MIMO communication. It also points out the advantages of FBMC over OFDM (orthogonal frequency division multiplexing) in the application of massive MIMO. The absence of cyclic prefix in FBMC increases the bandwidth efficiency. In addition, FBMC allows carrier aggregation straightforwardly. Self-equalization,...
Separation of noise sources from observations using an independent component analysis (ICA) allows the analysis of accumulated effects of noise radiated from equipment under tests, such as light-emitting diode (LED) lamps, which are sometimes simultaneously used in multiple numbers. The principal aim of this study is to experimentally perform blind source separation (BSS) by applying ICA to received...
The aim of the paper is to study the possibility of advancing noised non-Gaussian processes recognition using the features based on higher-order statistics. Several new recognition features based on the higher-order statistics, the basis of advancing recognition results in the presence of noise, decision rules and recognition system frameworks we proposed in the paper. The efficiency test of the proposed...
We demonstrate mitigation of inter-channel nonlinear interference noise (NLIN) in WDM systems for several amplification schemes. Using a practical decision directed recursive least-squares algorithm, we take advantage of the temporal correlations of NLIN to achieve a notable improvement in system performance.
In this paper, we consider a dual-hop multipleinput-multiple-output (MIMO) half-duplex amplify-and-forward relay network. Each terminal is equipped with multiple antennas. A novel and efficient precoding scheme based on per-antennasignal to leakage plus noise ratio (PA-SLNR) maximization is used at the relay downlink. We consider linear processing only at the relay terminal. The channel state information...
Heterogeneous network (HetNet) which contains different transmission power NodeBs has been researched extensively earlier in LTE system. Owing to the great improvement achieved by HetNet, HSPA HetNet is currently being standardized by 3GPP working group. In co-channel HSPA HetNet (CHH), Uplink-Downlink (UL-DL) imbalance caused by the hugely different power from different types of transmission nodes...
Duobinary partial response (PR) filtered single-carrier frequency-domain multi-access (SC-FDMA) uplink has a potential to achieve higher spectral efficiency (SE) by allowing spectrum overlapping between adjacent users. However, strong multiuser interference (MUI) degrades the bit-error rate (BER) and throughput performances. In this paper, we present two types of frequency-domain MUI cancellation...
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.