TY - GEN
T1 - LLR Calculation for On-Off Keying in Screen to Camera Communication Systems
AU - Suga, Norisato
AU - Sasaki, Ryohei
AU - Tanaka, Yuho
AU - Uruma, Kazunori
AU - Takahashi, Tomohiro
N1 - Publisher Copyright:
© 2020 IEEE.
PY - 2020/8
Y1 - 2020/8
N2 - 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.
AB - 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.
KW - Forward error correction
KW - OOK
KW - Screen to camera communication
KW - Visible light communication
UR - http://www.scopus.com/inward/record.url?scp=85090578726&partnerID=8YFLogxK
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U2 - 10.1109/MWSCAS48704.2020.9184521
DO - 10.1109/MWSCAS48704.2020.9184521
M3 - Conference contribution
AN - SCOPUS:85090578726
T3 - Midwest Symposium on Circuits and Systems
SP - 766
EP - 769
BT - 2020 IEEE 63rd International Midwest Symposium on Circuits and Systems, MWSCAS 2020 - Proceedings
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 63rd IEEE International Midwest Symposium on Circuits and Systems, MWSCAS 2020
Y2 - 9 August 2020 through 12 August 2020
ER -