Title :
Performance of convolutional codes in a direct-detection optical PPM channel
Author :
Forestieri, Enrico ; Gangopadhyay, Ranjan ; Prati, Giancarlo
Author_Institution :
Istituto di Sci. dell´´Ingegneria, Parma Univ., Italy
fDate :
12/1/1989 12:00:00 AM
Abstract :
Several strategies for combining convolutional codes (CCs) and pulse position modulation (PPM) in a direct-detection optical channel are considered, including binary and 2n-ary PPM with rate-1/ n CCs, 2m-ary PPM with a dual-m CC, and interleaved 2L-ary PPM with a rate-1/n CC. In the latter case, J.L. Massey´s (1981) concept of coding of L separate component channels constituting a 2L-ary PPM erasure channel is carried out for both the ideal photon counting and the avalanche photodetection (APD) cases, providing a comparative evaluation of the various strategies in terms of bit error probability and achievable coding gain for different code structures and decoding schemes
Keywords :
encoding; optical fibres; optical information processing; optical links; optical modulation; pulse position modulation; avalanche photodetection; bit error probability; coding gain; convolutional codes; direct-detection optical PPM channel; encoding; optical fibres; optical links; optical modulation; photon counting; pulse position modulation; Carbon capture and storage; Convolutional codes; Decoding; Error probability; Modulation coding; Optical devices; Optical fiber communication; Optical modulation; Optical pulses; Optical transmitters; Power system reliability; Pulse modulation;
Journal_Title :
Communications, IEEE Transactions on