LLR Calculation for On-Off Keying in Screen to Camera Communication Systems

Norisato Suga, Ryohei Sasaki, Yuho Tanaka, Kazunori Uruma, Tomohiro Takahashi

研究成果: Conference contribution

抄録

This paper studies a log likelihood ratio (LLR) calculation method for an on-off keying symbol in screen to camera communication (SCC) systems. To enhance the reliability of SCC, forward error correction is an essencial technique. For soft decision decoding of capacity approaching codes such as turbo code and low density parity check code, it is necessary to calculate the LLR as an input of the decoder. However, it has not been examined in any detail in the conventional studies on the SCC systems. This motivates us to focus on the LLR calculation method to realize a more reliable SCC system. For the calculation of LLR, we estimate the conditional probability of a received signal intensity assuming both Gaussian and Rayleigh distributions. To evaluate the coding scheme coupled with the proposed LLR calculation, we conduct an experiment using actual commercial devices. The results show that the proposed LLR calculation appropriately works and reduces bit errors.

本文言語English
ホスト出版物のタイトル2020 IEEE 63rd International Midwest Symposium on Circuits and Systems, MWSCAS 2020 - Proceedings
出版社Institute of Electrical and Electronics Engineers Inc.
ページ766-769
ページ数4
ISBN(電子版)9781538629161
DOI
出版ステータスPublished - 2020 8月
外部発表はい
イベント63rd IEEE International Midwest Symposium on Circuits and Systems, MWSCAS 2020 - Springfield, United States
継続期間: 2020 8月 92020 8月 12

出版物シリーズ

名前Midwest Symposium on Circuits and Systems
2020-August
ISSN(印刷版)1548-3746

Conference

Conference63rd IEEE International Midwest Symposium on Circuits and Systems, MWSCAS 2020
国/地域United States
CitySpringfield
Period20/8/920/8/12

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 電子工学および電気工学

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