IEEE TG13 Review of VLNComm’s PHY July 2017

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Presentation transcript:

IEEE 802.15 TG13 Review of VLNComm’s PHY July 2017 doc.: .... July 2017 IEEE 802.15 TG13 Review of VLNComm’s PHY July 2017 Date: 2017-07-17 Author: Mohammad Noshad Mohammad Noshad (VLNComm)

Advantages of Adding the Proposed Encoder-Decoder Lowering Flickering July 2017 doc.: .... July 2017 Advantages of Adding the Proposed Encoder-Decoder Lowering Flickering Combating Ambient Light Improving Energy Efficiency Mohammad Noshad Mohammad Noshad (VLNComm)

Rows of Hadamard matrix forms orthogonal basis July 2017 doc.: .... July 2017 Rows of Hadamard matrix forms orthogonal basis Add a vector to make signals positive Each component of u is M-ary PAM modulated Mohammad Noshad Mohammad Noshad (VLNComm)

July 2017 doc.: .... July 2017 HCM Transmitter Can be implemented with fast Walsh-Hadamard transform (FWHT) FWHT has a complexity of O(N logN) Mohammad Noshad Mohammad Noshad (VLNComm)

HCM Receiver Receiver is implemented using inverse FWHT (IFWHT) July 2017 doc.: .... July 2017 HCM Receiver Receiver is implemented using inverse FWHT (IFWHT) Mohammad Noshad Mohammad Noshad (VLNComm)

Improving Energy Efficiency July 2017 doc.: .... July 2017 Improving Energy Efficiency The first row of Hadamard matrix is all ones Adding or removing a DC value has no effect on (N-1) of the columns u2 u1 u3 u4 u5 u6 u7 We use only N-1 rows of Hadamard to modulate the data Send (x – min x) instead of x Then we can reduce the energy of transmitted signals New technique is named DC-reduced (DCR) HCM Mohammad Noshad Mohammad Noshad (VLNComm)

Improving Energy Efficiency July 2017 doc.: .... July 2017 Improving Energy Efficiency HCM signal DCR-HCM signal DC part Mohammad Noshad Mohammad Noshad (VLNComm)

DCR-HCM vs HCM Probability mass function for HCM and DCR-HCM July 2017 doc.: .... July 2017 DCR-HCM vs HCM Probability mass function for HCM and DCR-HCM HCM DCR-HCM HCM generates large signals with higher probability Mohammad Noshad Mohammad Noshad (VLNComm)

Energy Efficiency Improvement of DCR-HCM over HCM July 2017 doc.: .... July 2017 Energy Efficiency Improvement of DCR-HCM over HCM HCM DCR-HCM Mohammad Noshad Mohammad Noshad (VLNComm)

Interleaver for Dispersive Channel July 2017 doc.: .... July 2017 Interleaver for Dispersive Channel Mohammad Noshad Mohammad Noshad (VLNComm)

July 2017 doc.: .... July 2017 Pulse Shaping Optional pulse shaping can be used to increase spectral efficiency. Sinc pulses can be used instead of spectral inefficient rectangular pulses to transmit HCM signals by varying the driving current of the LED. Mohammad Noshad Mohammad Noshad (VLNComm)