Spectral properties and performance of multi-pulse impulse radio ultra-wideband systems with pulse-based polarity randomization are analyzed. Instead of a single type of pulse transmitted in each frame, multiple types of pulses are considered, which is shown to reduce the effects of multiple-access interference. First, the spectral properties of a multipulse impulse radio system is investigated...

abstract while computerized maintenance management system (cmms) enables maintenance managers and supervisors to access information about equipment, manpower and maintenance policies, there is still a need to facilitate getting data/information into the backend database where it can be utilized by the organization as information to make decisions regarding the operation of the organization. sig...

Sometimes called radio in the loop (RITL) or fixed-radio access (FRA), wireless local loop (WLL) is a system that connects subscribers to the public switched telephone network (PSTN) using radio signals as a substitute for copper for all or part of the connection between the subscriber and the switch. This includes cordless access systems, proprietary fixed radio access, and fixed cellular syst...

This resume describes the realization of a fully digital stereo FM Transmitter with RDS capability (Radio Data System), based on software radio architectures using FPGAs. This system can be remotely controlled by means of a WEB interface.

prevalence of thyroid nodules diagnosed by ultrasonography has been reported to be high (about 50%) probably due to iodine deficiency in our region. most thyroid nodules benign but some require treatment for cosmetic reasons or subjective symptoms. the conventional method of treatment in iran is surgery. for the first time in iran, from february 2016, 50 patients with 63 nodules (solid or cysti...

OSCR, a framework for the implementation of a cognitive radio, is designed to facilitate the integration of a cognitive engine with one or more existing Software Communications Architecture (SCA) based radios. It consists of two components: a multiplexer, which acts as the cognitive engine’s point of control for each individual radio within the system, and an SCA resource within each radio, whi...

Software Defined Radio (SDR) and Cognitive Radio (CR) are the key enabling technologies to overcome the spectrum scarcity problem a bit, by supporting dynamic spectrum access in which either a network or a wireless node reconfigures its transmission or reception parameters to communicate efficiently, avoiding interference with licensed or unlicensed users. CR senses the environment and enables ...

—For designing maritime wireless transmission system, the radio propagation over sea surface needs to be known first. One of the distinct characteristics of maritime radio propagation is the impact of ship motions due to the fluctuation of sea waves. This paper establishes a radio propagation model with the integration of the effects of ship motions. Using such an integrated radio propagation ...

The fast growth of the wireless communication industry poses severe limitations on radio astronomical observations. This is largely due to the fact that in radio astronomy, in contrast to communication systems, the signals of interest are many orders of magnitude below the receiver noise power levels. The structure of some communication signals opens the possibility to reduce the effect on radi...