6,435 research outputs found
Projections for Neutral Di-Boson and Di-Higgs Interactions at FCC-he Collider
As a high energy e-p collider, FCC-he, has been recently proposed with
sufficient energy options to investigate Higgs couplings. To analyse the
sensitivity on the Higgs boson couplings, we focus spesifically on the CP-even
and CP-odd Wilson coefficients with and four-point
interactions of Higgs boson with Effective Lagrangian Model through the process
. We simulate the related processes in FCC-he, with 60 GeV
and 120 GeV beams and 50 TeV proton beam collisions. We present the
exclusion limits on these couplings both for 68% and 95% C.L. in terms of
integrated luminosities.Comment: 18 pages, 20 figures, 3 table
Living and dealing with RF impairments in communication transceivers
This paper provides an overview of the sources and effects of the RF impairments limiting and rendering the performance of the future wireless communication transceivers costly as well as hindering their wide-spread use in commercial products. As transmission bandwidths and carrier frequencies increase effect of these impairments worsen. This paper studies and presents analytical evaluations of the performance degradation due to the RF impairments in terms of bit-error-rate and image rejection ratio. The paper also give highlights of the various aspects of the research carried out in mitigating the effects of these impairments primarily in the digital signal processing domain at the baseband as well as providing low-complexity hardware implementations of such algorithms incorporating a number of power and area saving techniques
Efficient low-power design and implementation of IQ-imbalance compensator using early termination
In this paper, we propose a low-complexity architecture for the implementation of adaptive IQ-imbalance compensation in quadrature zero-IF receivers. Our blind IQ-compensation scheme jointly compensates for IQ phase and gain errors without the need for test/pilot tones. The proposed architecture employs early-termination of the iteration process; this enables the powering-down of the parts of the adaptive algorithm thereby saving power. The complexity, in terms of power-down efficiency is evaluated and shows a reduction by 37-50 % for 32-PSK and 37-58 % for 64-QAM modulated signals
Analysis and compensation of RF impairments for next generation multimode GNSS receivers
Global navigation satellite system (GNSS) receivers require solutions that are compact, cheap and low-power, in order to enable their widespread proliferation into consumer products. Furthermore, interoperability of GNSS with non-navigation systems, especially communication systems will gain importance in providing the value added services in a variety of sectors, providing seamless quality of service for users. An important step into the market for Galileo is the timely availability of these hybrid multi-mode terminals for consumer applications. However, receiver architectures that are amenable to high-levels of integration will inevitably suffer from RF impairments hindering their easy widespread use in commercial products. This paper studies and presents analytical evaluations of the performance degradation due to the RF impairments and develops algorithms that can compensate for them in the DSP domain at the base band with complexity-reduced hardware overheads, hence, paving the way for low-power, highly integrated multi-mode GNSS receivers
Joint compensation of IQ-imbalance and carrier phase sychronization errors in communication receivers
This work addresses the joint compensation of IQimbalances
and carrier phase synchronization errors of zero-
IF receivers. The compensation scheme based on blind-source separation which provides simple yet potent means to jointly compensate for these errors independent of modulation format
and constellation size used. The low-complexity of the
algorithm makes it a suitable option for real-time deployment as well as practical for integration into monolithic receiver designs
Design of a power-aware digital image rejection receiver
This paper deals with and details the design of a power-aware adaptive digital image rejection receiver based on blind-source-separation that alleviates the RF analog front-end impairments. Power-aware system design at the RTL level without having to redesign arithmetic circuits is used to reduce the power consumption in nomadic devices. Power-aware multipliers with configurable precision are used to trade-off the image-rejection-ratio (IRR) performance with power consumption. Results of the simulation case studies demonstrate that the IRR performance of the power-aware system is comparable to that of the normal implementation albeit degraded slightly, but well within the acceptable limits
On various low-hardware-complexity LMS algorithms for adaptive I/Q correction in quadrature receivers
In this paper, the performance and convergence time
comparisons of various low-complexity LMS algorithms
used for the coefficient update of adaptive I/Q corrector
for quadrature receivers are presented. We choose the
optimum LMS algorithm suitable for low complexity,
high performance and high order QAM and PSK
constellations. What is more, influence of the finite bit
precision on VLSI implementation of such algorithms is
explored through extensive simulations and optimum
wordlengths established
Adaptive compensation of analog front-end I/Q mismatches in digital receivers
I and Q Channel phase and gain misniatches are of great concern in communications receiver design. In this paper we analyse the effects of I and Q channel mismatches and propose a low-complexity blind adaptive algorithm to minimize this problem. The proposed solution consists of two, 2-tap adaptive filters, arranged in Adaptive Noise Canceller (ANC) set-up, with the output of one cross-fed to the input of the other. The system works as a de-correlator eliminating I and Q mismatch errors
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