Proceedings of the IEEK Conference (대한전자공학회:학술대회논문집)

The Institute of Electronics and Information Engineers (대한전자공학회)
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Hardware design for SNR estimation of QAM modulation systems

QAM 변조 방식에 대한 SNR 추정을 위한 하드웨어 구현

  • Jung, Man-Ho (Electrons Department of Division of Electronics and Information Engineering, Chonbuk National University) ;
  • Song, Sang-Seob (Electrons Department of Division of Electronics and Information Engineering, Chonbuk National University) ;
  • Kim, Soo-Young (Electrons Department of Division of Electronics and Information Engineering, Chonbuk National University)
  • 정만호 (전북대학교 전자정보공학부 전자공학) ;
  • 송상섭 (전북대학교 전자정보공학부 전자공학) ;
  • 김수영 (전북대학교 전자정보공학부 전자공학)
  • Published : 2006.06.21
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Abstract

This paper presents a signal quality estimation technique for QAM modulation systems. By making a LUT(Look-up table) putting the number of N enough, we can derive estimated SNR from LUT even though N is small. That is so called MOTM algorithm. In 16-QAM, the distance $d_a$, between adjacent symbols is always invariable, so absolute value of R(the amplitude of signal) minus $d_a$ has a always same signal distribution value. This value does not form a Gaussian shape but, by making a little bit correction, we can make this symmetrical. So, from the received symbol value, by using LUT we can easily derive the estimated SNR. By considering this, we introduce a signal quality estimation technique for QAM schemes. This proposed method can be applicable to high order modulation schemes and wide range of signal to noise ratio.

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