Noise Figure of Digital Communication Receivers—Revisited

Namgoong, Won; Lerdworatawee, J.

doi:10.1109/tcsi.2004.830680

Cited by 9 publications

(6 citation statements)

References 12 publications

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“…Based on these analytical results, further derivation and investigation of interferers, noise transfer and respective mitigation for multiport receivers may be interesting. However, the fundamental nonlinear property and the direct dependence of the interfering, spurious baseband signals of the rectified wave will require an enhancement of the conventional SNR or noise figure (NF) analyses for receivers [27]. First research in this direction, for multiport receiver sub-components and applications can be found in [28] and [29].…”

Section: Rectified Wave Compensationmentioning

confidence: 99%

System Analysis of Six-Port-Based RF-Receivers

Mailand

2018

IEEE Trans. Circuits Syst. I

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Six-Port based mobile RF-receivers are a competitive alternative for the reception of today's and future wideband communications signals and software-defined-radio (SDR) systems. This article provides a general, systematic and analytic insight into the signal processing of six-port based receivers. The influences of the rectified wave within the receivers' signal processing will be identified to have significant impact on the practical application of Six-Port based receivers. The presented, first analytically complete system analysis considers any higher-order non-linearity and enables limitation-free design and simulation of such topologies. To overcome the spurious influences of the rectified wave, enhanced receiver architectures are presented which compensate for the rectified wave in analog domain.

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Section: Rectified Wave Compensationmentioning

confidence: 99%

System Analysis of Six-Port-Based RF-Receivers

Mailand

2018

IEEE Trans. Circuits Syst. I

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“…This NF is referred to as the effective NF. The effective NF can be shown to be the weighted harmonic mean of the single-tone NF, where the weights are proportional to the signal spectral density [38].…”

Section: Wideband Amplificationmentioning

confidence: 99%

Ultra-Wideband Radio

Scholtz

Pozar

Namgoong

2005

EURASIP J. Adv. Signal Process.

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The application of ultra-wideband (UWB) technology to low-cost short-range communications presents unique challenges to the communications engineer. The impact of the US FCC's regulations and the characteristics of the low-power UWB propagation channels are explored, and their effects on UWB hardware design are illustrated. This tutorial introduction includes references to more detailed explorations of the subject

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“…A potential difficulty of computing is that its spot NF varies with frequency, resulting in a nonflat noise spectrum. As described in [3], the equivalent NF (subsequently referred to as ) is the harmonic mean of the spot NF within the bandwidth of . Consequently, the equivalent noise power is times , and the lower bound is then simply (15) Note that the lower bound is the same as in the conventional SFDR when the spot NF is constant in the frequency band of interest, since becomes the spot NF.…”

Section: Defining the Wide-band Sfdrmentioning

confidence: 99%

“…In this paper, a modified definition of SFDR is proposed to generalize the conventional SFDR to wide-band systems. In this definition, the NF metric used to determine the lower bound is the effective NF proposed in [3]. Defined as the weighted harmonic mean of the measured spot NF across the frequency band of interest, the effective NF represents the loss in the achievable performance after the digital signal processing.…”

Section: Introductionmentioning

confidence: 99%

Revisiting spurious-free dynamic range of communication receivers

Lerdworatawee

Namgoong

2006

IEEE Trans. Circuits Syst. I

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The spurious free dynamic range (SFDR) is commonly used as a measure of dynamic range for the radio frequency and microwave front-end receivers. Although well defined in narrow-band systems, the definition becomes less clear in wide-band systems, when the nonlinearity is memoryless and the the noise figure is frequency dependent. To generalize the SFDR to wide-band systems, a meaningful physical interpretation of the conventional two-tone test is first developed. Based on this interpretation, the upper bound of the wide-band SFDR is obtained by applying a multitone test, while the lower bound is computed using the effective noise figure. The multitone test in both the memoryless and memory nonlinear Volterra systems is considered. A practical measurement technique to characterize the Volterra kernel is also provided. A realistic example based on a low noise amplifier shows a significant difference between the conventional and wide-band SFDR values. In this example, our results suggest that the use of two tones widely separated in frequency to model the interferers provides sufficiently accurate results compared to a multitone approximation.

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Noise Figure of Digital Communication Receivers—Revisited

Cited by 9 publications

References 12 publications

System Analysis of Six-Port-Based RF-Receivers

System Analysis of Six-Port-Based RF-Receivers

Ultra-Wideband Radio

Revisiting spurious-free dynamic range of communication receivers

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