• Title/Summary/Keyword: FM band

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Wideband Chirp Signal Generation for W-Band SAR (W-대역 영상레이다를 위한 광대역 Chirp 신호 발생장치)

  • Lee, Myung-Whan;Jung, Jin Mi;Lee, Jun Sub;Singh, Ashisg Kumar;Kim, Yong Hoon
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.29 no.2
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    • pp.138-141
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    • 2018
  • In this paper, we describe the designed digital waveform of a linear frequency-modulated (FM) chirp signal using field-programmable gate arrays (FPGAs) for image radar, and this signal is modulated with an I-Q modulator, and multiplied by 24 frequency multipliers to obtain a 94-GHz W-band wideband chirp generator. The developed chirp generator is an FM signal with a 94-GHz carrier frequency and a 960-MHz bandwidth, and the flatness is less than 1.0 dB at intermediate frequency (IF) (3.9 GHz), 2.0 dB in the W-band, and it has a 0.3-W output power in the W-band.

The Efficient Allocation Method of DAB Channels on T-DMB Frequency Band (T-DMB 대역에서 DAB 채널의 효율적인 채널 배치 방안)

  • Kim, Joo-Seok;Kim, Kyung-Seok
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.11 no.6
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    • pp.135-141
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    • 2011
  • Analog medias are converting to digital with the development of the digital communications. The Korean radio broadcasting services yet on analog and the research for the digital radio is progressing. The digital conversion of radio broadcasting has already progressed in foreign countries because of the technical limitation of analog broadcasting(The radio-frequency efficiency is poor). DAB is one of the digital radio mode, it doesn't use on AM/FM band and uses on T-DMB frequency band. So, it has an advantage of being able to broadcast with the existing radio without interference at once. On the other hand, it has the potential to cause interference to existing T-DMB broadcasting. In this paper, we propose an efficient DAB channel allocation method for digital radio on T-DMB frequency band. This paper allocates the DAB channel without interference to existing T-DMB broadcasting and proves the proposed method through simulations for the interference analysis.

Analyzed the performances for system withlimiter discriminator detection and integrate and dump post detection filtering (부분대역 재밍하에서 리미터-변별기 검파와 Integrate-and-Dump 펄터링을 고려한시스템의 성능 분석)

  • 이봉수;이사원
    • Journal of the Korea Society of Computer and Information
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    • v.3 no.4
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    • pp.78-85
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    • 1998
  • In this paper, we analyzed the performances for FH/CPFSK system with limiter - discriminator detection and integrate-and-dump post-detection filtering under thermal noise and partial-band jamming noise. And, we considered intersymbol interference - related SNR and differential phase parameters for all eight of the possible adjacent bit data patterns, FM noise clicks for evaluating FH/CPFSK and CPFSK systems. In result, the optimum modulation index h was 0.7 and the optimum value of bandwidth-time product D was 1.0. Next, when we considered the thermal noise under the partial-band jamming, the thermal noise significantly influenced the error probability of system below 20dB approximately but could ignore above 20dB.

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Design of Internal FM Radio Antenna for Mobile Terminal (휴대 단말기용 내장형 FM 라디오 안테나의 설계)

  • Han, Seung-Mok;Min, Kyeong-Sik
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.19 no.5
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    • pp.493-500
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    • 2008
  • This paper describes a design of internal frequency modulation(FM) radio antenna fur mobile terminal. In order to control of impedance at an operating frequency of the designed antenna, the lumped constant elements of R and L chip components are used. Patch and stubs located at antenna backside are added to control an exact resonance frequency and miniaturization. A fabricated antenna sire, the measured return loss, impedance, bandwidth, and gain are $40{\times}70{\times}1$ mm, -23 dB at 99 MHz, $55-j7{\Omega}$, 22 MHz($88{\sim}110$ MHz) below -10 dB, and -15 dBi, respectively. These measured results show a good agreement with simulated results. Especially, the measured gain of fabricated antenna is similar with value of a conventional ear-phone antenna in the designed frequency band. The measured radiation pattern agrees well with the calculated omni-directional pattern.

Implementation of IBAC DAB system using FPGA and DSP (FPGA와 DSP를 기반으로 한 IBAC DAB 시스템 구현)

  • Kim, Geon;Park, So-Ra;Jeong, Young-Ho;Lee, Soo-In
    • Proceedings of the IEEK Conference
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    • 2000.09a
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    • pp.251-254
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    • 2000
  • 본 논문은 IBAC(FM In Band Adjacent Channel) 방식의 디지털 오디오 방송(DAB; Digital Audio Broadcasting) 시스템 구현을 기술한 것이다. 구현한DAB 시스템은 현재 방송중인 FM방송의 인접 대역을 사용하기 위한 것으로, DAB 방송을 위해 주파수대역을 추가로 할당할 필요가 없으므로 주파수대역의 효율을 높일 수 있고 가용주파수 대역이 부족한 지역의 주파수할당에 대한 문제점을 해결할 수 있다.

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Acoustic Resonance Reduction Technique in HID-lamps by the FM Driving Signal for the Inverter (인버터 구동신호의 주파수 변조에 의한 HID 램프의 음향 공명 감소 기법)

  • Park, Chong-Yun;Choe, Hyueon-Hui;Lim, Ki-Seung
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.57 no.11
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    • pp.1981-1987
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    • 2008
  • This paper proposed one of various acoustic resonance reduction technique for three kinds of ceramic lamps (CDM-150, HCI-150, CMH-150). To reduce the acoustic resonance in the HID lamps, the researched results showed that the frequency modulated signal with the triangle waveform is very effective in order to drive th LCC type half-bridge inverter for HID lamp. Experimental results proved that the acoustic resonance could be rejected, if the adequate switching frequency band is selected and the driving signal frequency is modulated with a triangle waveform.

A Study on the Synchronous Signal Detection and Error Correction in Radio Data System (RDS 수신 시스템에서 동기식 신호복원과 에러정정에 관한 연구)

  • 김기근;류흥균
    • Journal of the Korean Institute of Telematics and Electronics A
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    • v.29A no.8
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    • pp.1-9
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    • 1992
  • Radio data system is a next-generation broadcasting system of digital information communication which multiplexes the digital data into the FM stereo signal in VHF/FM band and provides important and convenient service features. And radio data are composed of groups which are divided into 4 blocks with information word and check word. In this paper, radio data receiver is developed which recovers and process radio data to provide services. Then we confirm that 7dB SNR is required to be 10S0-5TBER of demodulation. Deconding process of shortened-cyclic-decoder has been simulated by computer. Also, the time-compression (by 16 times) method has been adopted for the RDS features post-processing. Via the error probability calculation, simulation and experimentation, the developed receiver system is proved to satisfy the system specification of EBU and implemented by general logic gates and analog circuits.

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A Study On The Practical Using Of The Frequency For The UHDTV And Digital Radio Broadcasting In The VHF And 700MHz Band (UHDTV와 디지털라디오방송을 위한 VHF대역과 700MHz대역 주파수의 활용 연구)

  • Park, Sung Kyu;Chae, Su;Park, Goo-Man
    • Proceedings of the Korean Society of Broadcast Engineers Conference
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    • 2013.11a
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    • pp.24-27
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    • 2013
  • 본 연구는 지상파TV의 디지털전환 완료 이후 아날로그 AM과 FM라디오의 디지털 전환과 새로운 UHDTV방송 도입을 위해 VHF 상위대역과 700MHz 대역에서의 효율적인 주파수 할당과 활용방안을 제시하고 있다. 아울러 방송은 UHD 영상과 디지털오디오 등 고품질 서비스도 중요하지만 무엇보다 수신이 잘되고 편리해야 하므로 강인한 신호 전송과 수신환경 개선 방안도 함께 제시하고자 한다. 특히 VHF 상 하위 대역과 AM/FM 라디오 대역 및 DTV 대역 그리고 700MHz 대역 등 방송주파수 전체 대역에서 UHDTV방송과 디지털라디오방송 환경을 구축하는데 서로 충돌 없는 합리적인 주파수 할당과 SFN 전송망 구축에 의한 효과적인 주파수 이용 방안을 제시하고 있다.

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The Digital Radio Research of Practical Use by DRM and DRM+ (DRM과 DRM+ 중심으로 디지털라디오 활성화 연구)

  • Park, Sung-Kyu;Park, Goo-Man
    • Proceedings of the Korean Society of Broadcast Engineers Conference
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    • 2012.07a
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    • pp.242-245
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    • 2012
  • 본 보고서는 지상파방송 디지털 전환 과정에서 아직 전송방식조차 선정하지 못하고 있는 라디오의 디지털화 추진과 관련하여 AM 라디오의 DRM 전송방식에 의한 실험방송 조기 추진의 필요성과 의미를 설명하고, FM의 디지털화 역시 DRM+ 전송방식 중심으로 TV채널 5번과 6번 LOW-VHF 밴드 주파수 대역에서의 OUT-OF-BAND 방법으로 검토해 봄으로써 기존 FM송신기 및 안테나와 콤바인이 쉽고 우수한 신호 전달력을 가진 LOW-VHF대역 주파수를 효과적으로 활용할 수 있으며 각 사업자별로 출력지정과 권역설정이 자유로워 디지털시대에 맞는 새로운 서비스 환경 구축과 AM/FM대역 동일방식 디지털 라디오 보급을 할 수 있는 특징으로 인해 라디오의 디지털화 추진에 유리한 방안임을 확인해 보고자 한다.

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Performance Analysis of the FH/CPFSK System with the Partial-band Jamming (부분대역 재망하에서 FH/CPFSK 시스템의 성능 분석)

  • 곽지규;박진수
    • Journal of the Korean Institute of Telematics and Electronics A
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    • v.31A no.5
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    • pp.1-9
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    • 1994
  • In this paper, we analyzed the performances for FH/CPFSK system with limiter-discriminator detection and integrate-and-dump post-detection filtering under thermal noise and partial-band jamming noise. And,we considered intersymbol interference-related SNR and differential phase parameters for all eight of the possible adjacent bit data patterns, FM noise clicks for evaluating FH/CPFSK and CPFSK Systems. In result, the optimum modulation index h was 0.7 and the optimum value of bandwidth-time product D was 1.0 Next, when we considered the thermal noise under the partial-band jamming, the thermal noise significantly influenced the error probability of system below 20dB approximately but could ignore above 20dB.

  • PDF