TY - GEN
T1 - A symbol decision scheme to mitigate effects of scintillations and MAIs in optical atmospheric PPM-CDMA systems
AU - Ohba, Koki
AU - Hirano, Tatsuma
AU - Miyazawa, Takaya
AU - Sasase, Iwao
PY - 2005
Y1 - 2005
N2 - In optical atmospheric (OA) pulse position modulation (PPM) code division multiple access (CDMA) systems, the conventional scheme which applies the maximum-value detection has a serious problem that the multiple access Interferences (MAIs) become large due to scintillations. In this paper, to mitigate both effects of scintillations and MAIs, we propose a symbol decision scheme by using the comparing detection. In our proposed scheme, the minimum output In all weighted positions Is detected In each PPM slot. Then, the maximum-value out of the minimum outputs Is detected, and, the symbol corresponding to the PPM slot In which the output has the maximum-value Is decided. Since the received symbol Is correctly decided as long as there Is at least one weighted position without MAIs In other PPM slots, the proposed scheme can mitigate both effects of MAIs and scintillations. We show that the proposed scheme can Improve the bit error rate performance.
AB - In optical atmospheric (OA) pulse position modulation (PPM) code division multiple access (CDMA) systems, the conventional scheme which applies the maximum-value detection has a serious problem that the multiple access Interferences (MAIs) become large due to scintillations. In this paper, to mitigate both effects of scintillations and MAIs, we propose a symbol decision scheme by using the comparing detection. In our proposed scheme, the minimum output In all weighted positions Is detected In each PPM slot. Then, the maximum-value out of the minimum outputs Is detected, and, the symbol corresponding to the PPM slot In which the output has the maximum-value Is decided. Since the received symbol Is correctly decided as long as there Is at least one weighted position without MAIs In other PPM slots, the proposed scheme can mitigate both effects of MAIs and scintillations. We show that the proposed scheme can Improve the bit error rate performance.
UR - http://www.scopus.com/inward/record.url?scp=33846627731&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=33846627731&partnerID=8YFLogxK
U2 - 10.1109/GLOCOM.2005.1578016
DO - 10.1109/GLOCOM.2005.1578016
M3 - Conference contribution
AN - SCOPUS:33846627731
SN - 0780394143
SN - 9780780394148
T3 - GLOBECOM - IEEE Global Telecommunications Conference
SP - 1999
EP - 2003
BT - GLOBECOM'05
T2 - GLOBECOM'05: IEEE Global Telecommunications Conference, 2005
Y2 - 28 November 2005 through 2 December 2005
ER -