This paper presents a study of LO selfmixing and RF gain control issues in direct conversion receivers. In cellular systems, that use continuous time frequency duplexing, these can constitute serious problems. The presented topic is of special importance when digitally programmable gain is implemented at the RF frequencies before the downconversion mixers, practically in the LNA. Furthermore, t...

As a mainstream technology in the 4G systems, TD-LTE (Time Division-Long Term Evolution) introduces Femto nodes to improve spectral efficiency per unit area. However, inter-cell cross-slot interference and uplink/downlink configuration are the key problems in TDD (Time Division Duplexing) system. In the paper, a traffic adaptation scheme with consideration of traffic demands and interference le...

Compared to other PCR technologies, digital PCR is a potentially highly accurate approach for the quantification of nucleic acid fragments. This study describes the impact of four experimental factors, namely primer and probe chemistry, PCR amplification target, duplexing, and template type, on the measurement results obtained by reverse transcription digital PCR (RT-dPCR) of viral RNA using in...

Carrier Aggregation (CA) is one of the Long Term Evolution Advanced (LTE-A) features that allow mobile network operators (MNO) to combine multiple component carriers (CCs) across the available spectrum to create a wider bandwidth channel for increasing the network data throughput and overall capacity. CA has a potential to enhance data rates and network performance in the downlink, uplink, or b...

The extreme data rate requirements for 5G have pushed the mobile industry to exploit the large amount of available spectrum in the millimetre-wave (mm-wave) bands. mmMAGIC (Millimetre-Wave Based Mobile Radio Access Network for Fifth Generation Integrated Communications) is a European project aiming to develop novel radio access technologies for mobile communication at mm-wave frequencies. One o...

Long Term Evolution (LTE) is a significant project of 3rd Generation Partnership Project (3GPP), initially proposed on the Toronto conference of 3GPP in 2004 and officially started as LTE work item in 2006. LTE, as a transition from the 3rd generation (3G) to the 4th generation (4G), has achieved great capacity and high speed of mobile telephone networks without doubt. It defines a new packet-o...

Wireless network has been improved after 3G by means of higher data rates with better coverage and by reducing latency. LTE is the technology that provides backward compatibility with 3G and 4G technologies. Compared with 3G, it offers high data rates of the order of 50Mbps for uplink and 100Mbps for downlink. LTE is able to provide services in scalable bandwidth (1.4, 3, 5, 10, 15 or 20 MHz). ...

The idea of adaptive usage of uplink frequency resources for other purposes, such as downlink data transmission, has attracted researchers for many years. As an extension of the conference paper on the same subject, this article discusses the concept of applying a multichannel simultaneous uplink and downlink transmission scheme for flexible duplexing, where the middle part of the so-called upl...

The Electrical Balance Duplexer (EBD) implements a form of self-interference cancellation, and can provide high Tx-Rx isolation whilst allowing simultaneous transmit (Tx) and receive (Rx) trough a single antenna in In-Band Full-Duplex (IBFD) radio transceivers. This paper presents a novel MicroElectroMechanical Systems (MEMS) based implementation of the tunable balancing impedance component of ...