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Optimum mapping in an optical multiple pulse position modulation link using a maximum likelihood sequence detection scheme

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2 Author(s)
Nikolaidis, K. ; Dept. of Eng. & Technol., Huddersfield Univ., Huddersfield ; Sibley, M.J.N.

The performance analysis of any multiple pulse position modulation (PPM) system is extremely time consuming because of the effects of different detection errors on the multiple PPM alphabet. In a small multiple PPM system such as (2 12), there are 64 codewords and each one can have ten possible false alarms, two possible erasures and four possible wrong-slot errors. The situation is worse if higher-order codes are considered. A novel algorithm, which reduces the time taken to predict the sensitivity of a multiple PPM system from almost 2 h of analysis to under a second, is presented. Results obtained using this method agree with those obtained using a full mathematical model. The authors also present a methodology that obtains a close to optimum mapping for any multiple PPM system. Detailed results show the effectiveness of this mapping routine.

Published in:

Optoelectronics, IET  (Volume:3 ,  Issue: 1 )