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Internally bandwidth efficient channel coding for fiber-optic CDMA communication systems with soft-input decoding

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3 Author(s)
Azmi, P. ; Dept. of Electr. Eng., Sharif Univ. of Technol., Tehran, Iran ; Nasiri-Kenari, M. ; Salehi, J.A.

We consider using a soft-input decoder for internally bandwidth efficient convolutionally coded fiber-optic code division multiple access (CDMA) communication systems using optical orthogonal codes (OOC). The convolution codes that are used for demonstrating the capabilities of the soft-input decoder are super orthogonal codes (SOC). These codes are near optimal and have a relatively low complexity. We evaluate the upper bounds on the bit error probability of the internally coded fiber-optic CDMA system using soft-input and hard-input decoders, assuming both on-off keying (OOK) and binary pulse position modulation (BPPM) schemes. It is shown that the soft-input decoder significantly outperforms the hard-input decoder.

Published in:

Communications, 2002. ICC 2002. IEEE International Conference on  (Volume:5 )

Date of Conference:

2002