한국산업정보학회논문지 (Journal of Korea Society of Industrial Information Systems)

한국산업정보학회 (Korea Society of Industrial Information Systems)
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채널추정 에러와 다중 전송률 서비스를 고려한 다수 개의 엑세스포인트 전송전력제어 알고리즘

Multi-Access Points Transmit Power Control Algorithm in Consideration of the Channel Estimation Error and the Multi Rate Service

  • 오창윤 (인하공업전문대학 정보통신과)
  • 투고 : 2020.05.12
  • 심사 : 2020.06.23
  • 발행 : 2020.08.31
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초록

본 연구에서는 채널추정 에러와 다중 전송률 서비스를 고려하여 다중 엑세스포인트 전송전력제어 알고리즘을 제안한다. 실제 통신시스템에서는 1) 채널추정을 위해 사용하는 파일럿심볼의 갯수가 제한적이기 때문에, 수신단에서 채널추정이 완전하지 않으며, 2) 다중 전송률 서비스가 지원된다. 먼저, 제안하는 알고리즘이 다중 전송률 서비스 환경에서도 유일한 최소전력에 수렴함이 보장됨을 이론적으로 증명한다. 제안하는 전송전력제어 알고리즘은 하나의 내부루프와 하나의 외부루프로 구성된다. 실험결과를 통해 1) 내부루프 알고리즘은 전송전력 레벨의 수렴과 다중 전송률 서비스를 보장하고, 2) 외부루프 알고리즘은 채널추정 에러를 보상할 수 있음을 확인하였다.

We propose a multi-access points transmit power control algorithm in consideration of the channel estimation error and the multi-rate service. In the real communication systems, the channel estimation at the receiver side is imperfect due to limited number of pilot symbol usage. Furthermore, the multi-rate service is supported. We theoretically prove the uniqueness and the convergence of the proposed algorithm in multi-rate service environment. The proposed algorithm composes of one inner loop part and one outer loop part. Simulation results show that 1) the inner loop algorithm guarantees convergence of the transmit power level and the multi-rate service, 2) the outer loop algorithm compensates for the channel estimation error.

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참고문헌

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