doc 15 17 0450 00 0013 July 2017

doc. : 15 -17 -0450 -00 -0013 July 2017 IEEE 802. 15 TG 13 Review of VLNComm’s PHY July 2017 Date: 2017 -07 -17 Author: Submission Slide 1 Mohammad Noshad

doc. : 15 -17 -0450 -00 -0013 July 2017 Advantages of Adding the Proposed Encoder-Decoder q Lowering Flickering q Combating Ambient Light q Improving Energy Efficiency Submission Slide 2 Mohammad Noshad

doc. : 15 -17 -0450 -00 -0013 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 Submission Slide 3 Mohammad Noshad

doc. : 15 -17 -0450 -00 -0013 July 2017 HCM Transmitter q Can be implemented with fast Walsh-Hadamard transform (FWHT) q FWHT has a complexity of O(N log. N) Submission Slide 4 Mohammad Noshad

doc. : 15 -17 -0450 -00 -0013 July 2017 HCM Receiver q Receiver is implemented using inverse FWHT (IFWHT) Submission Slide 5 Mohammad Noshad

doc. : 15 -17 -0450 -00 -0013 July 2017 Improving Energy Efficiency q The first row of Hadamard matrix is all ones Ø Adding or removing a DC value has no effect on (N-1) of the columns 0 u 1 u 2 u 3 u 4 u 5 u 6 u 7 q We use only N-1 rows of Hadamard to modulate the data q Send (x – min x) instead of x q Then we can reduce the energy of transmitted signals q New technique is named DC-reduced (DCR) HCM Submission Slide 6 Mohammad Noshad

doc. : 15 -17 -0450 -00 -0013 July 2017 Improving Energy Efficiency HCM signal DCR-HCM signal DC part Submission Slide 7 Mohammad Noshad

doc. : 15 -17 -0450 -00 -0013 July 2017 DCR-HCM vs HCM Probability mass function for HCM and DCR-HCM HCM generates large signals with higher probability Submission Slide 8 Mohammad Noshad

doc. : 15 -17 -0450 -00 -0013 July 2017 Energy Efficiency Improvement of DCR-HCM over HCM DCR-HCM Submission Slide 9 Mohammad Noshad

doc. : 15 -17 -0450 -00 -0013 July 2017 Interleaver for Dispersive Channel Submission Slide 10 Mohammad Noshad

doc. : 15 -17 -0450 -00 -0013 July 2017 Pulse Shaping q Optional pulse shaping can be used to increase spectral efficiency. q Sinc pulses can be used instead of spectral inefficient rectangular pulses to transmit HCM signals by varying the driving current of the LED. Submission Slide 11 Mohammad Noshad