Wideband technologies in the unlicensed spectrum can satisfy the ever-increasing demands for wireless bandwidth created by emerging rich media applications. The key challenge for such systems, however, is to allow narrowband technologies that share these bands (say, 802.11 a/b/g/n, Zigbee) to achieve their normal performance, without compromising the throughput or range of the wideband network....

Introduction: The Mars Science Laboratory (MSL) rover "Curiosity" will land in Gale crater on 6 August 2012 UT to begin a mission to investigate the habitability of an ancient aqueous sedimentary environment on Mars. MSL carries a comprehensive payload of remote sensing and in situ instruments designed to characterize the geology, elemental composition, mineralogy, and geochemistry of materials...

Metasurfaces have an exceptional capacity to manipulate the phase, amplitude, polarization, or spectrum of light. However, unit cells, meta-atoms, metasurfaces are conventionally designed using regular shapes, limiting performance improvement. The utilization with freeform shaped meta-atoms for on-chip ultraspectral imaging is proposed, where patterns generated controllable feature sizes and bo...

| Due to the scarcity of frequency allocations for emerging personal communications services, it has been proposed that spread spectrum (SS) signals be used in such services so that they can be overlaid on existing frequency band occupants. Such SS signals would be constrained in power so as not to interfere with pre-existing, narrowband users. In view of this application, suppression of strong...

We present a compact coherent anti-Stokes Raman scattering microscope based on a widely tunable picosecond Er:fiber laser. Intense and bandwidth-limited 1 ps pump pulses at a center wavelength of 775 nm are generated via frequency mixing within the broadband fundamental at 1.55 microm. Narrowband Stokes pulses are obtained by frequency shifting of solitons in a highly nonlinear bulk fiber and s...

We present a novel method for ground moving target detection and imaging using a SAR system transmitting ultra-narrowband continuous waveforms. We develop a new forward model that relates the velocity as well as reflectivity information at each location to a correlated received signal. We reconstruct moving target images by a filtered-backprojection method. We use the image contrast as a metric...

Slow light has been extensively studied for applications ranging from optical delay lines to single photon quantum storage. Here, we show that the time delay of slow-light significantly improves the performance of the narrowband spectral filters needed to optically detect ultrasound from deep inside highly scattering tissue. We demonstrate this capability with a 9 cm thick tissue phantom, havin...

UWB (Ultra-Wideband) is one of the WPAN (Wireless Personal Area Network) Technologies; its main applications include imaging systems, vehicular radar systems and communications and measurement systems. Ever since the FCC released unlicensed spectrum of 3.1-10.6 GHz for UWB application in 2002, UWB has received significant interest from both industry and academia. Comparing with traditional narr...

The idea of exploiting both task and data parallelism in programs is appealing. However, identifying realistic, yet manageable example programs that can beneet from such a mix of task and data parallelism is a major problem for researchers. We address this problem by describing a suite of ve application from the domains of scientiic, signal, and image processing that are of reasonable size, are...