Avinash Jain

Information-theoretic bounds on target recognition performance based on degraded image data

This paper derives bounds on the performance of statistical object recognition systems, wherein an image of a target is observed by a remote sensor. Detection and recognition problems are modeled as composite hypothesis testing problems involving nuisance parameters. We develop information-theoretic performance bounds on target recognition based on statistical models for sensors and data, and examine conditions under which these bounds are tight. In particular, we examine the validity of asymptotic approximations to probability of error in such imaging problems. Problems involving Gaussian, Poisson, and multiplicative noise, and random pixel deletions are considered, as well as least-favorable Gaussian clutter. A sixth application involving compressed sensor image data is considered in some detail. This study provides a systematic and computationally attractive framework for analytically characterizing target recognition performance under complicated, non-Gaussian models and optimizing system parameters.

Scheduling the cdma2000 reverse link

The performance of a scheduled cdma2000 reverse link is evaluated. Scheduling allows for trading-off system throughput and fairness. In our algorithm, the base station prioritizes the requests received from the mobiles and schedules mobiles by greedy filling the available rise-over-thermal (RoT) noise. The scheme provides for time division scheduling gains, while maximizing available RoT utilization. The choice of prioritizing function is driven by the objective of maximizing the throughput by exploiting the link condition of the mobile, reducing interference to the neighboring cells and providing fairness to all mobiles.

Reverse-link control mechanisms in CDMA2000 revision-D: performance evaluation

CDMA2000 revision D introduces, among other things, reverse link enhancing features that can literally be considered a paradigm shift. In particular, hybrid ARQ (HARQ), 3 control mechanisms and 2 advanced mobile reporting techniques offer the tools necessary for the rapid and efficient coordination of high-rate mobile data transmissions. This paper focuses on the control mechanisms and examines how best to utilize them. System-level simulations then illustrate how they complement each other.

cdma2000/spl reg/ Revision D reverse link enhancements

This work introduces the enhanced reverse link in Revision D of IS-2000, which is also known as cdma2000 1/spl times/EV-DV. The goals and considerations of the design process are discussed. Design alternatives, choices, and trade-offs are then presented. Finally, the overall operation of the system is examined.