• Proceedings of the Korean Society of Broadcast Engineers Conference
• /
• 2000.11b
• /
• pp.9-13
• /
• 2000

This paper represents analysis of field test results of terrestrial DTV on channel repeaters over Taejon city area. Two kind of on channel repeaters were tested. Non-regenerative repeater performs filtering, amplifying and re-transmit received main DTV signal. Regenerative repeater performs demodulation, modulation and amplifying and re-transmit received main DTV signal. The non-regenerative repeater threshold D/U ratio is about 10dB better than regenerative repeater's one.

• Proceedings of the Korean Institute of Communication Sciences Conference
• /
• 2006.07a
• /
• pp.529-529
• /
• 2006

• Proceedings of the Korean Institute of Communication Sciences Conference
• /
• 2006.07a
• /
• pp.579-579
• /
• 2006

• Proceedings of the KIEE Conference
• /
• 1987.07b
• /
• pp.841-844
• /
• 1987

In this paper we describe a planar type SAW(surface acoustic wave) FM discriminator, in which a 3 dB multistrip coupler is used to keep the linearity of wideband FM discrimination. This discriminator without 3 dB multistrip coupler is also applicable to DPSK demodulation.

• 제어로봇시스템학회:학술대회논문집
• /
• 1994.10a
• /
• pp.583-585
• /
• 1994

In this study, we have evaluated the effect of amplitude and frequency perturbation of EGG signal during single vowels associated with laryngeal pathology. The normal EGG signal is properly characterized by an autoregressive model which has the optimal order of ninth using the parametric method. This can be analyzed by determining the transfer function. Perturbations in the fundamental pitch and in the peak amplitude of EGG signal derived with a four-electrode system using the modulation/demodulation techniques were investigated for the purpose of developing a decision criteria for the laryngeal function identification.

• Journal of the Korean Institute of Telematics and Electronics
• /
• v.25 no.8
• /
• pp.867-873
• /
• 1988

The degradation due to channel distortion in a quadrature modulation system from the ideal constant values over the bandwidth of a direct sequence spread spectrum signal are considered. Through using series expansion for the channel gain and phase response, the degradation in the correlator output at the receiver is found as a function of the parameters involved , including phase error, delay error, linear gin variation, quadratic gain variation, and quadratic phase variation.

• Journal of the Korean Institute of Navigation
• /
• v.6 no.1
• /
• pp.1-18
• /
• 1982

In this paper, author studied on the elementary data required for the design of the receiver of Pseudo Noise (PN) phase modulation communication adopted in Global Positioning System(GPS). By computer simulation technique, the phase modulator, filters, and PN generator are designed, and also required bandwidth of R-F amplifier for carrier frequency in phase modulation system is investigated. It is verified that the optimum bandwidth is about 3 times of the PN frequency and almost independent of the carrier frequency. And the low pass filter required for demodulation of slow Boolean data is also found to be about 60 times of the data signal frequency.

• Proceedings of the IEEK Conference
• /
• 2008.06a
• /
• pp.167-168
• /
• 2008

We suggest a phy layer of a sensor node. The proposed sensor nodes work well around metal or liquids because they operate at low frequency. In addition we present a demodulation algorithm for simultaneously decoding multiple received signals and a simulation result.

• 제어로봇시스템학회:학술대회논문집
• /
• 2002.10a
• /
• pp.86.1-86
• /
• 2002

Polarity correlation is a simplified version of the usual, having a possibility of real-time processing without any reduction of precision. In this paper, its applicability in deterministic signals is first explored generally, by theoretical or numerical analysis of four kinds of the typical signals. Then, based on the results, its two applications are proposed, that are detection and demodulation of FSK signals in digital communication, and time delay estimasion in ultrasonic A-mode measurement. The effectiveness of the proposed applications is confirmed by its superior implementation ability and the results of numerical experiments under practical circumstances.

• Proceedings of the IEEK Conference
• /
• 1999.11a
• /
• pp.503-506
• /
• 1999

Recently, as increasing population of internet, the larger one of required facts is solution for access speed, that transmission performance. ADSL system can provide the best application to resident in low cost, flexible approach. In this paper, for DMT line code that is one of ADSL modulation/demodulation signal processing methods, transmission performance and characteristic are discussed as studies and analysis through computer simulation using MATLAB. We made results with practising simulation using parameters based on ANSI standard Tl .413 Iusse2.