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A technique based on the resistance-method for extracting the channel-length reduction of counter-implanted p-metal oxide semiconductor field effect transistors with either conventional or LDD structure is recommended. The validity of the method was verified through the examination of numerical devices with different channel profiles, lateral diffusion ratio of source/drain island and contact resistances. Results showed good accuracy and reliability of the proposed extraction method.

A method based on the relationship between device threshold voltage and substrate bias is proposed to extract the nonuniform channel doping profile of enhancement mode p-metal oxide semiconductor field effect transistors (MOSFET) with counter implantation. The method measures current-voltage characteristics directly with no special large test structure required. Results showed good agreements with the measured subthreshold properties of long and short-channel devices. The channel profile can be used for the evaluation of the characteristics of p-MOSFETs.

Since the inception of the dynamic source routing (DSR) protocol for mobile ad hoc networks, several enhancements have been proposed, along with other competing routing protocols. All of them provide different degrees of throughput improvement under different scenarios. In this paper, we use DSR as a base, diagnose the contribution of its constituent components, and provide the reason why certain routing enhancements can increase the throughput and under what conditions. A major finding of the study is that the broadcast mechanism used in propagating route request and route error messages has a significant impact on how routing behaves. We also show that unicast route error report and preventive cache update improve throughput at different sides of the mobility spectrum. Finally, we show that aggressive buffer combined with route management provides the best performance improvement on the entire mobility and loading spectrum. [ABSTRACT FROM AUTHOR]

SUMMARY The problems generated by the interference will be more complicated in the future. A combination of adaptive array and equalizer has been employed to solve the problems of interference when an adaptive array alone cannot suppress all the interferences. A constant modules algorithm (CMA) of the combination system was proposed to solve the problems of insufficient degrees of freedom and main-beam multipath interference when no training signal is transmitted. The limitation of the CMA for combination systems is due to its slow rate of convergence. In this paper, an orthogonalized blind algorithm for hybrid of array and equalizer (OBHAE) is proposed to combat the problems of the interference. Because the modified input vector of the adaptive array is orthogonalized by the OBHAE in advance, the convergent rate of the CMA system can be improved by the OBHAE. When the coherent interference presents, the performance of the system will be degraded. In this paper, an orthogonalized spatial smoothing blind (OSSB) algorithm is proposed to further enhance the cancellation of the coherent interference. In the OSSB, we combine the OBHAE with the spatial smoothing method to combat the coherent interference problem. Simulation results are presented to demonstrate the merits of the OBHAE and the OSSB. Copyright © 2012 John Wiley & Sons, Ltd. [ABSTRACT FROM AUTHOR]