TY - GEN
T1 - Enhanced 3-D OCDMA Code Family using Asymmetric Run Length Constraints
AU - Nlend, Samuel
AU - Swart, Theo G.
N1 - Publisher Copyright:
© 2019 IEEE.
PY - 2019/9
Y1 - 2019/9
N2 - This paper suggests an enhanced performance of the 3-D optical code division multiple access (OCDMA) codes, a space/wavelength/time spreading family of codes. The initial codes are in the format wavelength hopping/time sequence (WH/TS), selected according to their performance requirements and the TS sequence is constructed to achieve a linear spacetime complexity. The asymmetric run length constraints are introduced in that regard, such that the positive bit positions align with the encoder/decoder frequency spacing pattern, yielding a 3-D WH/WS/TS. The selected 2-D OCDMA codes are one-coincidence frequency hopping codes (OCFHC) and optical orthogonal codes (OOC). As a time sequence code, the OOC code length is extended with a code rate of 0.04. The complexity and the bit error rate (BER) are herein given and compared with previous work. The results of the performance show not only an improvement in the number of simultaneous users due to the code length extension, but better correlation properties and hence a better signal-to-noise ratio.
AB - This paper suggests an enhanced performance of the 3-D optical code division multiple access (OCDMA) codes, a space/wavelength/time spreading family of codes. The initial codes are in the format wavelength hopping/time sequence (WH/TS), selected according to their performance requirements and the TS sequence is constructed to achieve a linear spacetime complexity. The asymmetric run length constraints are introduced in that regard, such that the positive bit positions align with the encoder/decoder frequency spacing pattern, yielding a 3-D WH/WS/TS. The selected 2-D OCDMA codes are one-coincidence frequency hopping codes (OCFHC) and optical orthogonal codes (OOC). As a time sequence code, the OOC code length is extended with a code rate of 0.04. The complexity and the bit error rate (BER) are herein given and compared with previous work. The results of the performance show not only an improvement in the number of simultaneous users due to the code length extension, but better correlation properties and hence a better signal-to-noise ratio.
KW - Optical orthogonal code (OOC)
KW - asymmetric run length constraints
KW - difference of position (DoP)
KW - neighbor difference
KW - optical code division multiple access (OCDMA)
UR - http://www.scopus.com/inward/record.url?scp=85088387424&partnerID=8YFLogxK
U2 - 10.1109/AFRICON46755.2019.9133799
DO - 10.1109/AFRICON46755.2019.9133799
M3 - Conference contribution
AN - SCOPUS:85088387424
T3 - IEEE AFRICON Conference
BT - IEEE AFRICON 2019
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2019 IEEE AFRICON, AFRICON 2019
Y2 - 25 September 2019 through 27 September 2019
ER -