Abstract
We investigate the impact of state-complexity reduction on the performance
of maximum likelihood sequence detection (MLSD) receivers for direct-photodetection
long-haul optical communication systems affected by uncompensated chromatic
dispersion (CD). We directly compare two possible approaches: (i)
detection through a simple “brute-force”
state-complexity reduction strategy and (ii) a more structured reduced-state
sequence detection (RSSD) strategy. The performance of both state-complexity
reduction techniques is evaluated considering two realistic optical transmission
schemes, based on on-off keying (OOK) and optical duobinary modulation (ODBM),
respectively. The detection algorithms are characterized considering the impact
of the timing offset, the quantization scheme, and the amount of uncompensated
CD. As one would expect, for a given number of states in MLSD receivers, the
schemes based on RSSD exhibit better performance with respect to those based
on simple brute-force state-complexity reduction. However, we show that MLSD
schemes based on the use of brute-force state-complexity reduction are characterized
by a better complexity/performance trade-off for low/medium CD values, whereas
RSSD is the best choice for high CD values.
© 2008 IEEE
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