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In this paper we provide an overview regarding the feasibility of in-band full-duplex transceivers under imperfect RF components. We utilize results and findings from the recent research on full-duplex communications, while introducing also transmitter-induced thermal noise into the analysis. This means that the model of the RF impairments used in this paper is the most comprehensive thus far. By...
This paper investigates active cancellation techniques for a Full-Duplex transceiver. An auxiliary transmit chain is employed to create the cancellation signal, which is then injected at the receiver RF front-end by using a microstrip cou-pler. Two methods are proposed to calculate the self-interference cancellation signal. While the first method assumes the transmit chain to be strictly linear, the...
In this paper, a new method is proposed to enhance the efficiency of band-pass subsampling for multi-band RF signals in order to relax design specifications for Software Defined Radio receivers. Hence, analytical formulations are defined to calculate the minimum valid sub-sampling frequency by adding specific guard bands around RF signal bands in order to overcome implementation imperfections and...
In wireless communication terminal such as smart mobile devices, a countermeasure for electromagnetic noise generated by digital circuits becomes more important since it's coupling to an antenna causes degradation of communication performance. To apply an optimum countermeasure, it is very important to find out correctly a noise coupling path. This paper gives evaluation results of noise coupling...
A digital-to-RF converter (DRFC) architecture for IQ modulator is proposed in this paper. The digital-RF converter utilizes the mixer DAC concept but a discrete-time oscillatory signal is applied to the digital-RF converter instead of a conventional continuous-time LO. The architecture utilizes a low pass ΣΔ modulator and a semi-digital FIR filter. The digital ΣΔ modulator provides a single-bit data...
This paper presents a 5.15GHz-5.825GHz CMOS down-conversion mixer with high-gain, low-noise, and low-power for WLAN 802.11a receiver. The cascade topology is adopted at the transconductance stage to improve power gain and reduce noise factor. And the inductive peaking technique is implemented at the switching stage to flatten the frequency bandwidth of conversion gain. This mixer is implemented in...
Traditional approaches to environmental sounds recognition used acoustic features merely based on time domain or frequency domain. In this paper, a new feature descriptor that uses image texture information is proposed to identify specific environmental sounds based on the recognition of fixed-duration sounds segments where their corresponding spectrums are viewed as gray-level images. The proposed...
The multi-Bernoulli filter is a promising method for computationally efficient and accurate multi-target tracking. Computationally tractable approximations of the multi-Bernoulli filter equations for superpositional sensors were recently derived. In this paper we present a particle filter implementation of these approximate update filter equations. We describe how the filter could be employed to address...
Full-duplex wireless communication offers improved spectral efficiency, as well as more efficient relaying and medium access, but requires suppression of self-interference. In this paper we analyze the existing methods for active RF suppression and use the ”Rice architecture” for its low complexity and favorable scaling when applied to multi-antenna systems. We analyze the effects of the different...
Recently, full-duplex (FD) communications with simultaneous transmission and reception on the same channel has been proposed. The FD receiver, however, suffers from inevitable self-interference (SI) from the much more powerful transmit signal. Analogue radio-frequency (RF) and baseband, as well as digital baseband, cancellation techniques have been proposed for suppressing the SI, but so far most...
We have designed and fabricated ultra-low noise, high power laser source and high dynamic range receiver for RF over fiber. Links with Noise Figure of less than 5dB have been measured and dynamic range dependence on link gain investigated. RF optical links were tested successfully in an ESM system.
This paper presents a high-linearity and low-noise down-conversion active mixer at 2.1–2.5 GHz for a receiver with low conversion gain. This proposed circuit has been designed and fabricated with a 0.35 µm SiGe BiCMOS process. The layout size is 0.34 × 0.3 mm2. Through simulation, the designed mixer achieves an input 1dB compress point of +10.8 dBm, an IIP3 of +19.4 dBm, a DSB noise figure of 8 dB...
Positron Emission Tomography (PET) combined with Magnetic Resonance Imaging (MRI) as a hybrid imaging modality is about to become the next-generation imaging technique in the field of molecular imaging. The integration of PET detectors into an MR-gantry enabling simultaneous acquisitions with unaffected performance of PET and MRI is challenging, as PET detectors need to be unaffected by the MR operation,...
Energy efficiency and spectral efficiency of a Large Scale Antenna System in both dense urban and suburban multi-macro-cellular scenarios are quantified using a new total energy efficiency model, which consists of a rigorous capacity lower bound and a power model accounting for RF generation, LSAS critical computing and a per antenna internal power consumption for other analog electronics and A/D...
Systems-on-Chip (SoC) and Systems-in-Package (SiP) are the most feasible solutions to fulfil the requirements of the new communication systems [1]. Both solutions will lead to a fundamental change in the design of analogue front-end architectures. It requires a high performance technology with devices that provide complex digital functionalities and can easily achieve operating frequencies in the...
A modeling concept for accurate prediction of 1/f-noise in millimeter wave Schottky detectors is presented. The concept is based on DC bias current measurements with precise knowledge of the diode structure. Key aspect is the distinction between DC and RF current distribution at the Schottky contact, specifically investigated on a quasi vertical diode structure.
Existing methods of self-interference cancellation have greatly reduced the strong self-interference signal for the practical design of Full-Duplex (FuDu) wireless systems. However, current FuDu wireless is hard to be put into practice due to the reason that residual self-interference after interference cancellation is still much stronger than the thermal noise. In this paper, a wideband FuDu OFDM...
AMS, RF, and memory circuits can be highly susceptible to performance degradation caused by process variation, thermal noise, and other non-idealities. This session presents recent advances in modeling these effects, gaining insight into their operation, and techniques to mitigate them.
Local oscillator (LO) sideband noise suppression by a balanced superconductor-insulator-superconductor (SIS) mixer was investigated in the 0.9 THz band. An LO signal in the 0.9 THz band was generated by using fixed tuned x9 (x3 by x3) multipliers located in the cryostat 4-K stage. Despite the huge LO noise of about 1000 K of a YIG driven LO, the measured receiver noise temperature for YIG and Gunn...
To be practical wideband receivers must tolerate large out-of-band blockers which can desensitize the receiver through gain compression or reciprocal mixing with LO phase noise. This paper reviews how a new noise-cancelling receiver architecture — that utilises 3 important circuit innovations — mitigates gain compression without compromising noise figure. While the architecture is still susceptible...
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