[show abstract][hide abstract] ABSTRACT: Fitting noisy measurements to a circle is a classic statistical estimation problem. In this paper, we make two contributions to the study of this problem. First, we propose a novel formulation of the maximum likelihood (ML) estimator for identifying the center and radius of the circle from noisy measurements. This new estimator uses the unknown true values of the measurement points as the nuisance parameter to obtain an exact ML formulation. We then examine the Karush-Kuhn-Tucker (KKT) conditions for the optimum solution to the ML estimator. We show analytically that this new estimator is in fact equivalent to the well-known least squares (LS) form of the circle fitting problem. Second, from the insights gained in deriving the optimum solution, a computationally simple circle fitting algorithm based on greedy search is proposed. Performance results are given to illustrate the performance of the proposed algorithm.
Communications (ICC), 2011 IEEE International Conference on; 07/2011
[show abstract][hide abstract] ABSTRACT: With the increasing convergence and cooperation among wireless networks, network awareness of user equipment (UE) has become very important. A practical solution for network information delivery for UE, Cognitive Pilot Channel (CPC), has recently been proposed. It can provide UE with the necessary network information for network selection by using the public signaling channel. In this paper, a cognitive multicast CPC scheme is proposed. It can greatly improve the on-demand CPC delivery efficiency, and also reduce the time delay of information delivery. The cognitive characteristics of the proposed multicast CPC scheme can easily be adapted to different heterogeneous network architectures.
Proceedings of the 72nd IEEE Vehicular Technology Conference, VTC Fall 2010, 6-9 September 2010, Ottawa, Canada; 01/2010
[show abstract][hide abstract] ABSTRACT: In this paper, we propose a mode transfer architecture and cross layer design for connection aware applications in wireless communication systems. System architecture design and implementation are considered, and practical design examples are given based on existing wireless systems. To evaluate the proposed method, the performance of the network before and after mode transfer is compared. An unequal error protection (UEP) scheme for video frame transmission is also introduced to illustrate and evaluate the possible gain for video streaming with cross layer design.
Proceedings of the 23rd Canadian Conference on Electrical and Computer Engineering, CCECE 2010, Calgary, Alberta, Canada, 2-5 May, 2010; 01/2010