100-GHz and 300-GHz coherent radio-over-fiber transmission using optical frequency comb source Author(s): Atsushi Kanno; Toshiaki Kuri; Iwao Hosako; Tetsuya Kawanishi; Yoshihiro Yasumura; Yuki Yoshida; Ken-ichi Kitayama Millimeter-wave and sub-millimeter-wave radio-over-fiber (RoF) technology with digital-signal-processing aided coherent detection can be a promising candidate for high-speed rad...

The purpose of this paper is to present a radio frequency Impulse Radio Ultra-Wide Band (IR-UWB) communication method and integrated circuit (IC). The simple hardware architecture, the low power consumption and the relatively high achievable data rate make this system well adapted for use in portable, battery powered communication objects. The transceiver uses a Frequency Hopping On-Off Keying ...

This paper describes two transceiver architectures for a transmission system using Impulse Radio Ultrawideband, having innovative techniques for receiver synchronization and bit detection. Both systems have low complexity and are suitable for implementation using CMOS technology. Two distinct techniques for UWB non-coherent transceivers are focused: the Transmitted-Reference (TR) technique with...

The effect of pitch-angle anisotropy of fast electrons on generation of nonthermal radio emission is studied. Incoherent gyrosynchrotron radiation is shown to depend strongly on the anisotropy. In particular, the spectral index of gyrosynchrotron radiation increases up to a factor of 3-4 compared with the isotropic case. The degree of polarization (X-mode) increases for loss-cone distributions,...

This paper presents recent work on reconfigurable all-digital radio architectures. We leverage the flexibility and scalability of synthesized digital cells to construct reconfigurable radio architectures that consume significantly less power than a software defined radio implementing similar architectures. We present two prototypes of such architectures that can receive and demodulate FM and FR...

In order to establish emission limits to protect radio systems, the effect of the non-Gaussian properties of interference on the performance of coded radio transmission systems should be taken into account. In this paper, a simple closed-form expression for the bit error probability (BEP) of convolutional codes is developed for coherent BPSK systems assuming that the interfering signal is expre...

We have developed a multi-pixel beamformer technique, which can be used to enhance the capability of studying pulsars using an interferometric array. Using the Giant Metrewave Radio Telescope (GMRT), we illustrate the application of this efficient technique, which combines the enhanced sensitivity of a coherent array beamformer with the wide field-of-view seen by an incoherent array beamformer....