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In this paper, mode conversion method in a circular waveguide, based on dielectric phase shift is proposed. Radiation from high power microwave sources generally consists of null or minimum power on the axis, due to presence of TM01 mode. To get the maximum power on the axis, TM01 mode can be converted into dominant TE11 mode. Conventional TM01 to TE11 mode converters are serpentine-profile circular...
Network contention has a significantly adverse effect on the performance of parallel applications with increasing size of parallel machines. Machines of the petascale era are forcing application developers to map tasks intelligently to job partitions to achieve the best performance possible. This paper presents a framework for automated mapping of parallel applications with regular communication graphs...
In recently proposed multiple access techniques such as IDMA and OFDM-IDMA, the user separation is done by user specific interleavers in contrast to conventional CDMA scheme where user separation is assured with user-specific signature sequences. The user specific interleavers must demonstrate minimum probability of collision amongst each other in addition to other merits including minimal consumption...
In modern wireless communication system design, antennas with wide impedance bandwidth are desirable for numerous reasons. An antenna with a wide impedance bandwidth may be used for transmission and reception of multiple narrowband services in a multi-purpose platform. Alternatively a single wideband service may be of interest for various radar and imaging applications, or for impulse based radio...
Multiple wireless network interfaces in a single mobile device exist in order to support their diverse communications and networking needs. This paper proposes a general switching architecture, SwitchR, for managing radio communications for multiple (client) devices utilizing multiple heterogeneous radios per device. SwitchR is deployable incrementally within existing wireless infrastructures, and...
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