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- Laleh Najafizadeh, Chintha Tellambura
- IEEE Trans. Vehicular Technology
- 2006

Imperfect channel estimation (ICE) can severely degrade the bit error rate (BER) of digital modulations with maximum ratio combining (MRC) diversity reception. The resulting performance analysis problem in its most general setting has not been addressed before. In this paper, the effect of ICE on the BER of an arbitrary square/rectangular Gray-coded… (More)

- Laleh Najafizadeh, Igor M. Filanovsky
- ISCAS
- 2004

When a diode-connected MOS transistor is biased with a PTAT current source, the gate-source voltage of such transistor can be temperature independent. Based on this idea a circuit is designed and implemented in a standard 0.18-μm CMOS technology. The simulations show that the output voltage of this reference has the temperature coefficient of 4 ppm/◦C in… (More)

- Jana M. Kainerstorfer, Mark N. Polizzotto, +9 authors Amir H. Gandjbakhche
- PloS one
- 2013

Diffuse multi-spectral imaging has been evaluated as a potential non-invasive marker of tumor response. Multi-spectral images of Kaposi sarcoma skin lesions were taken over the course of treatment, and blood volume and oxygenation concentration maps were obtained through principal component analysis (PCA) of the data. These images were compared with… (More)

- Franck Amyot, Trelawny Zimmermann, +7 authors Eric M. Wassermann
- NeuroImage
- 2012

The ability to assess frontal lobe function in a rapid, objective, and standardized way, without the need for expertise in cognitive test administration might be particularly helpful in mild traumatic brain injury (TBI), where objective measures are needed. Functional near infrared spectroscopy (fNIRS) is a reliable technique to noninvasively measure local… (More)

- Nader Karamzadeh, Andrei Medvedev, Afrouz Azari, Amir Gandjbakhche, Laleh Najafizadeh
- NeuroImage
- 2013

A new approach to trace the dynamic patterns of task-based functional connectivity, by combining signal segmentation, dynamic time warping (DTW), and Quality Threshold (QT) clustering techniques, is presented. Electroencephalography (EEG) signals of 5 healthy subjects were recorded as they performed an auditory oddball and a visual modified oddball tasks.… (More)

- Laleh Najafizadeh, Chintha Tellambura
- ICC
- 2005

In this paper, we derive a general expression for the bit error rate (BER) performance of an arbitrary square/rectangular Gray-coded quadratic amplitude modulation (QAM) scheme. This general formula requires a number of conditional probabilities which we derive in closed-form for independent and nonidentically distributed (i.n.d.) Rayleigh fading channels,… (More)

- Laleh Najafizadeh, Igor M. Filanovsky
- ISCAS
- 2004

A sub-1-V CMOS voltage reference, which takes advantage of summing the gate-source voltages of two NMOS transistors operating in saturation region, is presented. Both transistors are working below zero temperature coefficient point and thus the voltage reference is able to operate with low supply voltage. The circuit is implemented in a standard 0.18-μm… (More)

- Jana M. Kainerstorfer, Jason D. Riley, +10 authors Amir H. Gandjbakhche
- Biomedical optics express
- 2011

We describe a novel reconstruction algorithm based on Principal Component Analysis (PCA) applied to multi-spectral imaging data. Using numerical phantoms, based on a two layered skin model developed previously, we found analytical expressions, which convert qualitative PCA results into quantitative blood volume and oxygenation values, assuming the epidermal… (More)

The transconductance characteristics of MOS transistors realized in 0.18 p n CMOS technology have B zerotemperature coefticient (ZTC) bias point. The presence of this point influences performance of both analog and digital circuits. The offset voltage drift in a saurce-coupled differential pair strongly increases, if the transistor drain currents are equal… (More)

- Yi Huangt, Chun Cheungt, Laleh Najafizadeh
- 2013

A systematic design methodology utilizing piecewise curvature correction technique for the purpose of improving the temperature coefficient of bandgap references (BGRs) is presented in this paper. It is shown that the temperature dependency of the drain current of a MOSFET transistor depends on the transistor's operating region. Using this property, a… (More)