• The Transactions of the Korean Institute of Electrical Engineers D
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• v.54 no.2
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• pp.116-123
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• 2005

Chirp spread spectrum method using both time and frequency component is fit to time varying channel such as powerline channel. The used chirp symbol based on the CEBus standard is the unit symbol which sweeps from 100kHz to 380kHz over a 25㎲. To evaluate the performance of between Chirp-SS and DSSS, we measured the bit error rate under Gaussian channel. Simulation result is shown that Chirp-SS has a about 3[dB] gain of SNR than DSSS. To verify the performance of implemented modem, it is made up the powerline channel environment. After adding several noises to it, we examined the receiving status of modem. The implemented modem is able to receive the signal over the powerline channel with having several noises and capacitive loads.

• Journal of the Korea Institute of Military Science and Technology
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• v.14 no.1
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• pp.69-73
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• 2011

In the defence wireless communications, conventional Anti-Jamming techniques(Frequency Hopping/Spread Spectrum or Direct Sequence/Spread Spectrum) are used to overcome a intentional interfering signals which are single/multitone or partial band jammer etc. DS/SS techniques is very strong on tone jamming signal but not to be on a partial band jammer. So FH/SS AJ performances are expected method of an substitution of DS/SS, however FH/SS could not have good performance on some BMTJ(Band Multi-tone Jammer). So this paper proposes FH-CSS (Frequency Hopped - Chirp Spread Spectrum) to get more robustness against jammers(BMTJ, PBNJ) and analyze the AJ performances.

• The Journal of Information Technology
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• v.6 no.4
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• pp.81-91
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• 2003

This paper is concerned with the implementation of power line communication system with 9.6Kbps. This system is suitable to establish the smart home using the power line having been installed in house. In the suggested power line communication system, we use the chirp signal with a linearity and spread spectrum frequency band of 100KHz~200KHz. We had the performance experiment for the implementation system. The experiment was achieved in the pseudo load network similar to real circumstance of power line communication. As the result, the communications under the circumstance were accomplished satisfactorily. We confirmed that the suggested 9.6Kbps power line communication system with the Chirped-SS method had the performance enough to commercialize the smart home.

• Proceedings of the KIEE Conference
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• 2007.07a
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• pp.1874-1875
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• 2007

전력선 통신(Power Line Communication)은 전력선과 연결되어 있는 디바이스들을 간단히 제어하기 위한 기술로 제안 되었으며, 홈오토메이션, 원격 검침(AMR) 분야에서 많이 사용되고 있다. 최근에는 스마트 홈, 유비쿼터스와 관련해 다양한 홈 네트워크 시스템들이 제안되면서 이들 시스템을 효과적으로 구현할 수 있는 방안으로 전력선 통신기술이 많이 제안되고 있다. 전력선 통신은 많은 유용성에도 불구하고 전력선 채널에 대한 정확한 채널 모델링과 전력선 모뎀의 성능에 관해서는 많은 문제점을 나타내고 있다. 본 논문에서는 전력선 통신을 위한 전송선로의 주파수에 대한 잡음과 임피던스 특성 및 전력선 채널에 데이터 신호를 Chirp-SS(Spread Spectrum) 신호로 맵핑하여 채널의 Zero Cross Point 구간에 전송하였을 때의 시뮬레이션 결과와 설계된 FPGA 보드를 비교분석 하였다. 채널 모델은 배경 잡음과 할로겐 잡음, 전송선로의 감쇄 특성만을 고려하였으며, 전력선 채널 상에서의 Zero Cross Point를 이용한 전력선 통신 모뎀의 성능을 분석하였다.