• 전기전자학회논문지
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• 제21권4호
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• pp.338-347
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• 2017

본 논문은 TDL(전술 데이터 링크)의 항공용 단말의 구성품인 고출력증폭기의 설계 및 제작에 관해 기술하였다. 동일한 주파수 대역을 사용하는 레이다 및 다른 통신장비와 한정된 주파수 자원을 효율적 사용이 가능하도록 고속주파수도약기술, 인지무선기술, 수신필터뱅크 기술을 적용하였다. 고출력증폭기는 물리적으로 송신부, 수신부, 기구부, 케이블조립체로 구성되며, 최대 전송 거리, 수신감도 등의 전기적 특성과 온도 특성을 충족하도록 설계되었다. 고출력증폭기의 요구 규격을 만족하기 위해 모델링 및 시뮬레이터를 이용하였다. 송신 출력과 잡음 지수는 각각 50.02dBm 및 2.682dB로 측정되었다. 전기적 특성 시험 및 환경 특성 시험으로 요구 규격을 모두 만족함을 확인하였다.

• Journal of Communications and Networks
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• 제18권1호
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• pp.50-64
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• 2016

Nowadays, smart meter (SM) technology is widely effectively used. In addition, power allocation (PA) and channel selection (CS) are considered problems with many proposed approaches. In this paper, we will suggest a specific scenario for an SM configuration system and show how to solve the optimization problem for transmission between SMs and the data concentrator unit (DCU), the center that collects the data from several SMs, via simulation. An efficient CS with PA scheme is proposed in the TV white space system, which uses the TV band spectrum. On the basic of the optimal configuration requirements, SMs can have a transmission schedule and channel selection to obtain the optimal efficiency of using spectrum resources when transmitting data to the DCU. The optimal goals discussed in this paper are the maximum capacity or maximum channel efficiency and the maximum allowable power of the SMs used to satisfy the quality of service without harm to another wireless system. In addition, minimization of the interference to the digital television system and other SMs is also important and needs to be considered when the solving coexistence scenario. Further, we propose a process that performs an interference analysis scheme by using the spectrum engineering advanced Monte Carlo analysis tool (SEAMCAT), which is an integrated software tool based on a Monte-Carlo simulation method. Briefly, the process is as follows: The optimization process implemented by genetic evolution optimization engines, i.e., a genetic algorithm, will calculate the best configuration for the SM system on the basis of the interference limitation for each SM by SEAMCAT in a specific configuration, which reaches the solution with the best defined optimal goal satisfaction.