| TOPIC: Nonlinear Subsystem Analysis, Characterization and Modelling |
| Manuscript Title: Nonlinear Distortion Generation Mechanisms in Wireless Polar Transmitters |
| Manuscript Id: IJMOT-2008-6-12 |
| Abstract: This paper discusses the most important nonlinear distortion generation mechanisms present in modern wireless polar transmitters. It begins by using the spectrum and power efficiency trade-off in wireless communication systems to justify the polar transmitter architecture. Then, it identifies the key fidelity impairments under a traditional two-tone excitation, and uses an analytical formulation of its nonlinearities to illustrate the distortion levels that should be expected from such a system. |
| Authors: Pedro M. Cabral, José C. Pedro, José A. Garcia |
Category: Nonlinear Subsystem Analysis, Characterization and ModellingTechnology Submitted On: 6/5/2008 Full Text [PDF] Pg.Nos: 196-201
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| Manuscript Title: Accurately Characterizing the Vdd-to-AM and Vdd-to-PM Nonlinearities in a GaN HEMT Class E Power Amplifier |
| Manuscript Id: IJMOT-2008-5-14 |
| Abstract: In this paper, an experimental procedure is proposed for accurately characterizing the Vdd-to-AM and Vdd-to-PM nonlinearities in a class E power amplifier (PA). Based on GaN HEMT technology, this transmission line switching PA is aimed to be used as modulating stage of a 900 MHz polar transmitter. Measured results under a two-tone excitation support the need for predistorting functions. |
| Authors: N. Amar, J. A. García, B. Bedia, P. M. Cabral, J. C. Pedro, M. Boussouis |
Category: Nonlinear Subsystem Analysis, Characterization and ModellingTechnology Submitted On: 5/26/2008 Full Text [PDF] Pg.Nos: 202-207
|
| Manuscript Title: Large-Signal Measurements-Based Characterization of
Power Amplifiers for Modern Wireless Applications |
| Manuscript Id: IJMOT-2008-5-17 |
| Abstract: The continuous evolution towards high
functionality wireless handsets gives rise to more
complex demands in power amplifier (PA)
characterization. In this paper, it is discussed how
vector large-signal measurements can be utilized in
the evaluation of the emerging multi-band multistandard
power amplifier designs. To demonstrate
this capability, a dual-band GaN HEMT PA was
designed and analysed in detail under dual-band
excitation conditions. |
| Authors: Dominique Schreurs, Maciej Myslinsky, Alessandro Cidronali, Manuel Yarleque Medina,
Paolo Colantonio, Franco Giannini, Rocco Giofrè, Bart Nauwelaers |
Category: Nonlinear Subsystem Analysis, Characterization and ModellingTechnology Submitted On: 5/5/2008 Full Text [PDF] Pg.Nos: 208-217
|
| Manuscript Title: Characterization of Nonlinear Dynamic
Microwave Devices and Systems |
| Manuscript Id: IJMOT-2008-5-18 |
| Abstract: This paper discusses the problem of
microwave characterization of a broad class of
nonlinear dynamic microwave devices and systems. For
that, it will be shown how the amplitude and phase
responses to two-tones or, more general multi-sines,
can be accurately captured, and related to each other
in practical PA cases.
The measurement procedure will be evidenced in the
paper since it is a fundamental step for all the dynamic
characterization.
The characterization of nonlinear mixing products of
microwave PAs, evidencing nonlinear memory effects,
will be used as an illustrative example of the proposed
nonlinear measurement techniques |
| Authors: Nuno Borges Carvalho , João Paulo Martins |
Category: Nonlinear Subsystem Analysis, Characterization and ModellingTechnology Submitted On: 5/7/2008 Full Text [PDF] Pg.Nos: 218-223
|
| Manuscript Title: Analysis of Bit Error Rates and Effects of Non-linear Phase
Shift in Amplitude Differentially Phase Modulated DWDM
Systems |
| Manuscript Id: IJMOT-2008-5-33 |
| Abstract: The characteristic degradation
mechanism of the Self phase modulation (SPM)
and Cross phase modulation (XPM) on Amplitude
and Differentially Phase Shift keying in dense
wavelength division multiplexing have been
theoretically investigated. The intensity dependent
nonlinear phase shift relationship is derived from
Schrödinger equations. The SPM introduces
intensity dependent rotation in the signal
constellation diagram of APSK, whereas phase
shift introduced by XPM is random. It has been
shown that the variation in phase shift in XPM is
twice that of SPM. The effects of eye closure
resulted by SPM and XPM are expressed in terms
of Probability of error. |
| Authors: Aditya Ambardekar, Banmali Rawat, Moncef Tayahi |
Category: Nonlinear Subsystem Analysis, Characterization and ModellingTechnology Submitted On: 5/6/2008 Full Text [PDF] Pg.Nos: 224-234
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