Receiver Architectures for Software-defined Radios in Mobile Terminals: the Path to Cognitive Radios

Bourdoux, André; Craninckx, Jan; Dejonghe, Antoine; Perre, Liesbet Van der

doi:10.1109/rws.2007.351886

Cited by 22 publications

(9 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Because performance tradeoffs tend to fall so heavily on the receiver front end, and involve relatively inflexible components, many multiband systems that receive a range of frequencies use multiple, parallel front-ends, tuned to different frequencies, using distinct matching networks and LNAs [4], [5]. Alternatively, an LNA with wideband impedance matching and good noise figure can be achieved using either a wideband amplifier with resistive feedback [6], [7], or with a noise-canceled LNA [8].…”

mentioning

confidence: 99%

Implications of Passive Mixer Transparency for Impedance Matching and Noise Figure in Passive Mixer-First Receivers

Andrews

Molnar

2010

IEEE Trans. Circuits Syst. I

261

141

View full text Add to dashboard Cite

In this paper, a class of passive mixer-first, LNA-less receivers is analyzed in depth. Quadrature passive mixers are shown to present the impedance of their baseband port to the RF port and vice versa. This transparency property, in combination with resistive feedback differential amplifiers, and "complex" feedback between the I and Q paths, can be used to control the impedance at the RF port. This impedance can be tuned using only baseband components (i.e., resistors). The noise limits of such an architecture are analyzed and simulated, and are shown to be comparable to standard RF-LNA-first receivers. Accounting for the higher harmonics of the LO frequency proves critical in accurately analyzing the behavior of these circuits and their ability to provide an impedance match with low noise figure. Additionally, it is shown that expanding quadrature passive mixers to harmonic rejection mixers allows for even better noise performance and wider matching range.

show abstract

mentioning

confidence: 99%

Implications of Passive Mixer Transparency for Impedance Matching and Noise Figure in Passive Mixer-First Receivers

Andrews

Molnar

2010

IEEE Trans. Circuits Syst. I

261

141

View full text Add to dashboard Cite

show abstract

“…This approach shows much similarity to subsampling architectures. A similar concept employing bandpass sampling at RF is discussed in [2], [49] though the concept was not implemented, and there are several drawbacks such as very stringent requirements on the ADC, the need of tunable RF filters, noise aliasing, and degradation of the SNR due to clock jitter. Another interesting development is the introduction of the direct DeltaSigma receiver [50]- [54].…”

Section: Sdr Receiversmentioning

confidence: 99%

“…Furthermore, even for current standards, the SDR concept has the potential to reduce the cost of the receiver dramatically by eliminating (or reducing the number of) parallel receive paths. For SDR receivers, moving the ADC closer to the antenna was already a trend in 2007 [49], providing more flexibility and the ability to receive several channels at different frequencies simultaneously. This comes at the cost of increased ADC requirements (dynamic range and input bandwidth) and increased linearity requirements of the receive chain.…”

Section: Gmentioning

confidence: 99%

Wireless Receiver Architectures Towards 5G: Where Are We?

Bronckers

Roc'h²,

Smolders³

2017

IEEE Circuits Syst. Mag.

View full text Add to dashboard Cite

“…12(a)) and 2) RF bandpass sampling receivers (Fig. 12(b)) [55]. Zero-IF receivers down-convert all desired frequencies directly to baseband.…”

Section: B Radio-frequency and Mixed-signal Integrated Circuit Designmentioning

confidence: 99%

Cognitive Radio and Networking Research at Virginia Tech

et al. 2009

View full text Add to dashboard Cite

A large research team with a wide range of expertiseVfrom ICs and reconfigurable computing to wireless networkingVworks to achieve the promise of cognitive radio. ABSTRACT | More than a dozen Wireless @ Virginia Tech faculty are working to address the broad research agenda of cognitive radio and cognitive networks. Our core research team spans the protocol stack from radio and reconfigurable hardware to communications theory to the networking layer.Our work includes new analysis methods and the development of new software architectures and applications, in addition to work on the core concepts and architectures underlying cognitive radios and cognitive networks. This paper describes these contributions and points towards critical future work that remains to fulfill the promise of cognitive radio. We briefly describe the history of work on cognitive radios and networks at Virginia Tech and then discuss our contributions to the core cognitive processing underlying these systems, focusing on our cognitive engine. We also describe developments that support the cognitive engine and advances in radio technology that provide the flexibility desired in a cognitive radio node. We consider securing and verifying cognitive systems and examine the challenges of expanding the cognitive paradigm up the protocol stack to optimize end-to-end network performance.Lastly, we consider the analysis of cognitive systems using game theory and the application of cognitive techniques to problems in dynamic spectrum sharing and control of multipleinput multiple-output radios.

show abstract

Receiver Architectures for Software-defined Radios in Mobile Terminals: the Path to Cognitive Radios

Cited by 22 publications

References 8 publications

Implications of Passive Mixer Transparency for Impedance Matching and Noise Figure in Passive Mixer-First Receivers

Implications of Passive Mixer Transparency for Impedance Matching and Noise Figure in Passive Mixer-First Receivers

Wireless Receiver Architectures Towards 5G: Where Are We?

Cognitive Radio and Networking Research at Virginia Tech

Contact Info

Product

Resources

About