Keying

About: Keying is a research topic. Over the lifetime, 6598 publications have been published within this topic receiving 82943 citations.

Joint automotive radar-communications waveform design

Abstract: The paper studies the problem of waveform design for a joint Radar-Communications (RadComms) system in an automotive setting characterized by a multitarget environment The envisaged joint waveform allows exploitation of existing infrastructure to support additional functionalities In this contribution, an automotive radar employing Phase Modulated Continuous Waveform (PMCW) is considered wherein, the transmission of communications bits is additionally facilitated Particularly, the RadComms system is enabled by the transmission of Differential Phase Shift Keying (DPSK) communications symbols, each symbol modulated by the PMCW sequence Further, the receiver processing includes demodulation of the communication symbols in addition to the extraction of the radar parameters — range, Angles of Arrival (AoA) and Doppler returns of the targets In particular, FFT and subspace-based methods are proposed for estimating the radar parameters which are subsequently used in the demodulation of the communication symbols using diversity combining techniques The performed study demonstrates the impact of the joint set-up on the two systems It also highlights the effect of system parameters on the performance of receiver algorithms and the trade-off between the FFT and sub-spaced based processing

Elliptical Core Few Mode Fibers for Multiple-Input Multiple Output-Free Space Division Multiplexing Transmission

Abstract: We experimentally demonstrate space division multiplexed data transmission using the LP01, LP11a and LP11b modes over a 1 km length of elliptical-core few mode fiber at 1550 nm using 10 Gb/s ON–OFF keying data per spatial channel. Space division multiplexed transmission without the use of any multiple input multiple output digital signal processing showed no power penalty relative to the single-mode or the back to back cases.

Graphene FET Gigabit ON–OFF Keying Demodulator at 96 GHz

Abstract: We demonstrate the demodulation of a multi-Gb/s ON–OFF keying (OOK) signal on a 96 GHz carrier by utilizing a 250-nm graphene field-effect transistor as a zero bias power detector. From the eye diagram, we can conclude that the devices can demodulate the OOK signals up to 4 Gb/s.

A piano learning support system considering rhythm

Abstract: Playing the piano requires various techniques such as correct keying, fingering and rhythm. Our research group developed a piano learning system to support correct keying and fingering for beginners. However, the system did not support the learning of rhythm. Rhythm consists of various kinds of note and rest, and it is difficult for beginners, who are not used to reading a score, to understand the different duration of each note and rest. Alternatively, there are piano roll scores, which describe timing of keying and releasing clearly, but which do not teach players how to read a musical staff. Therefore, the goal of our study is to construct a piano learning support system that considers rhythm. We discuss methods of effectively indicating information for piano performance, such as rhythm information, while teaching how to read a musical staff. We have developed a prototype system, and evaluated its effectiveness through actual use of the system. We found that it had significant advantages over a piano roll method.

Ultrawideband Chipless RFID: Reader Technology From SFCW to IR-UWB

Abstract: RFID is a widely employed wireless technology to identify items and animals (including humans). The reader, which is usually controlled by a computer, transmits an interrogating signal toward the tag. The backscattered signal is, in turn, modulated from the tag, mostly with either binary phase-shift keying or amplitude-shift keying. This is possible through the presence of an application-specific integrated circuit [1].