Hamming (11, 15) is optionally used in within the data block. The value of PHY PIB attribute, phyOccFec, shall determine whether Hamming code is used or not. In an example of 8x8 invisible cells Tx, four words of 11 information-bits shall be coded into four codewords, each consists of 15 bits, to be transmitted at once. Annex L: PHY 4,5,6 OCC-Waveforms Decoding Guide L-1. S8-PSK Decoding Method At a sampling time, a camera captures two groups of sources; and from an image, each group forms a set of four ON/OFF states. Also, a sampling called bad-sampling (when the camera captures the transition time of a single LED among LEDs of the group) shall generate a presence of an unclear state (x_state) among a set of four states. For both cases, the captured set of a group shall be represented by S_Phase as shown in Table A4. Table A4. S_Phase Determination Set of 4-States Set of 4-States S_Phase (w/o presence x_state) (w/ presence of x_state) Output Input 1000 1x00 1 1100 11x0 2 1110 111x 3 1111 x111 4 0111 0x11 5 0011 00x1 6 0001 000x 7 0000 x000 8 From an image, two group of light sources shall produce a pair of S_Phase values (S_Phase(1) representing the captured state of the group 1 and S_Phase(2) representing the captured state of the group 2). And then, the value of S_Phase_Shift is calculated as following: S_Phase_Shift = S_Phase(1) - S_Phase(2)
Hamming (11, 15) is optionally used in within the data block. The value of PHY PIB attribute, phyOccFec, shall determine whether Hamming code is used or not. In an example of 8x8 invisible cells Tx, four words of 11 information-bits shall be coded into four codewords, each consists of 15 bits, to be transmitted at once. Annex L: PHY 4,5,6 OCC-Waveforms Decoding Guide L-1. S8-PSK Decoding Method At a sampling time, a camera captures two groups of sources; and from an image, each group forms a set of four ON/OFF states. Also, a sampling called bad-sampling (when the camera captures the transition time of a single LED among LEDs of the group) shall generate a presence of an unclear state (x_state) among a set of four states. For both cases, the captured set of a group shall be represented by S_Phase as shown in Table A4. Table A4. S_Phase Determination Set of 4-States (w/o presence x_state) Input Set of 4-States (w/ presence of x_state) S_Phase Output 1000 1x00 1 1100 11x0 2 1110 111x 3 1111 x111 4 0111 0x11 5 0011 00x1 6 0001 000x 7 0000 x000 8 From an image, two group of light sources shall produce a pair of S_Phase values (S_Phase(1) representing the captured state of the group 1 and S_Phase(2) representing the captured state of the group 2). And then, the value of S_Phase_Shift is calculated as following: S_Phase_Shift = S_Phase(1) - S_Phase(2)
15-17-0019-02-007a-kookmin-d1-revised-sections-phy-4-5-6.docx