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An in-band full-duplex transceiver prototype with an in-system automated tuning for RF self-interference cancellation
This paper presents a transceiver prototype capable of in-band full duplex communication. Apart from a conventional transceiver and antenna, this prototype relies on a tunable electrical balance duplexer to minimize the in-band self-interfe...
Techniques to improve power amplifier energy efficiency for 5G
Improved spectral and energy efficiency are two key requirements for the fifth generation (5G) wireless communication systems. The inefficiency and non-linearity of traditional power amplifiers (PA) pose significant challenges to meet these...
Spatial array processing in a 3D multiuser network
The performances of spatial array processing algorithms along with three-dimensional (3D) antenna arrays are studied in this paper. Optimal linear beamforming is compared to codebook based processing. The elevation domain is further utilize...
I/Q imbalance calibration for higher self-interference cancellation levels in Full-Duplex wireless transceivers
This paper investigates a Full-Duplex transceiver using an active cancellation technique where an additional transmit chain is employed to create the self-interference cancellation signal. Both transmitters and also the receiver are impaire...
Analysis of the effect of nonlinear low noise amplifier with memory for wideband spectrum sensing
In wideband sensing receivers, especially in low-cost mass-product devices, the sensing operation is usually done in a range where the RF front-end components, such as the LNAs exhibit a nonlinear behavior. Consequently, intermodulation (IM...
Assessment of channel interference for Licensed Shared Access (LSA) in the 2.3–2.4 GHz band
This text simulates sharing conditions between incumbent spectrum user and mobile network operator (MNO) at the frequency band 2.3 - 2.4 GHz. The probability of interference between radio systems helps to determine appropriate frequency pla...
Licensed Shared Access in distributed antenna systems enabling network virtualization
A distributed antenna system (DAS) architecture is considered to be a key enabler for further Network Virtualization where different network configurations are created as needed by a centralized decision making unit that is typically integr...
Massive MIMO and waveform design for 5th generation wireless communication systems
This article reviews existing related work and identifies the main challenges in the key 5G area at the intersection of waveform design and large-scale multiple antenna systems, also known as Massive MIMO. The property of self-equalization ...
Performance analysis of block and comb type channel estimation for massive MIMO systems
For pilot sequence based multiple input multiple output (MIMO) channel estimation, the arrangements of pilot symbols, such as the block or comb type arrangement, is known to play an important role. In this paper we compare the performance o...