Due to the main advantages of spread spectrum techniques such as good performance in frequency selective channels, high data rate and capacity flexibility, W–CDMA has been selected as transmission technology for 3G cellular systems. With respect to the overall system performance, the initial synchronization of the locally generated PN sequence with the received signal is a critical task. In ord...

Threads posed by Distributed Denial of Service (DDoS) attacks are becoming more serious day by day. Accurately detecting DDoS becomes an important and necessary step in securing a computer network. However, Flash Event (FE), which is created by legitimate requests, shares very similar characteristics with DDoS in many aspects and makes it hard to be distinguished from DDoS attacks. In this pape...

Massive MIMO is widely recognized as an essential technology for 5G. Together with newly allocated spectrum (bandwidth) and network densification (small cells), it is expected to play a key role in coping with the ongoing explosion in data-traffic demand and services. Compared to 4G MIMO technologies, massive MIMO can offer large gains in cell spectral efficiency, which, in combination with sma...

Recent market trend of eco-friendly products let the manufacturers be ready for the high quality of maintenance technologies to assure the system’s high efficiency during its entire life span. However, this post-manufacturing activities burden the manufacturer with high warranty cost. Therefore, in order to promote economical businesses, the manufacturers are developing various fault detection ...

The Pre-Rake diversity combining technique decreases the complexity, size and cost of the mobile unit while achieving the same inter symbol interference (ISI) mitigation effects of conventional Rake receiver for direct sequence code division multiple access (DS-CDMA) systems. The technique is based on preprocessing of signal at the transmitter relying on knowledge of the channel state informati...

Efficient and robust fault detection and diagnosis (FDD) can potentially play an important role in developing building management systems (BMS) for high performance buildings. Our research indicates that, in comparison to traditional model-based or data-driven methods, the combination of time series modeling and machine learning techniques produces higher accuracy and lower false alarm rates in...

In FDD cellular standards, the transmitter’s out of-band noise leaks into the receive band due to the finite duplexer TX to RX isolation. If this noise is not low enough, a SAW filter is needed before the Power Amplifier to preserve the RX sensitivity. Out-of-band noise is also an important concern for coexistence of cellular transmitters with standards like GPS, WLAN and/or WiMAX on the same s...

Polymer solution has extremely extensive applications in many natural and industrial processes, especially oilfield development field, such as polymer flooding, fracturing water shut-off. Thus, the study of flow behaviors formation pores is significantly important. In this paper, droplets 3-D pore throat structure were systematically studied. Additionally, influencing factors (polymer concentra...