• Title/Summary/Keyword: Multidimensional QAM

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Exact Analysis of a Real-Number M-ary QAM (실수 M진 QAM의 정확한 분석)

  • Jeon, Seong-bae;Lee, Ji-hoon;Chung, Hae
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.42 no.2
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    • pp.299-306
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    • 2017
  • The real number M-ary QAM system can reduce PAPR and effectively improve the transmission efficiency as it increases gradually the value of M according to the state of channel. However, only approximate performance analysis was performed due to the complexity of the analysis. In this paper, we introduce an exact performance analysis considering the change of a boundary line due to the difference in frequency of use of the signal points. Also, we propose a new constellation of 2 time dimension ($3{\times}2^m$)-ary QAM with odd m which has better performance in PAPR. In the performance analysis, we obtain the signal point error rate and the bit error rate of real number M-ary QAM for the various values of m and compare performance between the proposed QAM and the conventional $2^k-ary$ QAM with integer k.

Multidimensional Signaling Schemes Based on Wavelet Packed Bases (웨이브릿 패킷에 기초한 다차원 시그널링 방식 고찰)

  • 박대철;손인수
    • Proceedings of the Korean Society of Broadcast Engineers Conference
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    • 1997.11a
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    • pp.115-118
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    • 1997
  • 주어진 채널에 대하여 원하는 성질을 갖는 통신신호 파형을 설계하는데 있어 본 논문에서는 발생하는 잡음과 간섭의 효과를 최소화해주는 신호 셀을 생성하기 위해 시간-주파수제안된 WPM 변조 기법을 현재 사용되고 있는 QAM 방식과 비교하여 광범위한 간섭 환경에 적응적으로 대처할 수 있는 융통성있는 구조를 제공해줌을 보였다.

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