Advanced Coding
Turbo codes
LDPC codes
PA/GPA codes
TPC codes
Coding Theory
ML analysis
Iterative analysis
Channel capacity
Decoding algorithms
Wireless
PA on Rayleigh
Thresholds for Rayleigh
Optical Fiber
PA for OFC
ML bounds
Channel capacity
Data Storage
TPC/LDPC on PR
TPC on Lorentzian
Thresholds for ISI
Networks
Routing protocols
ARQ
Client/Server programming
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Optical Fiber
Communications
Product
Accumulate Codes
for Optical
Fiber
Channels:
Bandwidth- and power-efficient forward error correction codes are desired for
optical fiber communications. We investigate
the performance of several advanced codes on optical fiber channels where
amplitude spontaneous emission (ASE) noise dominates all other noise
sources.
Three channel models are considered: asymmetric Chi-square, asymmetric
Gaussian and symmetric Gaussian.
- Product accumulate (PA) codes are proposed as a low-complexity
alternative to turbo or LDPC codes for AWGN channels.
We investigate their potential for use in optical fiber communications.
We show that they can achieve impressive coding gains on optical fiber
channels also.
(paper).
Maximum
Likelihood Bounds:
Theoretical analysis is conducted to facilitate the evaluation of FEC for
optical fiber communications. Pairwise error probability (PEP) is derived
for three channel models and union bounding technique is exploited.
- To evaluate the performance of PA codes at high SNR regions that are beyond
simulation capabilities, we explore an ensemble average bound under
the assumption of ML decoding
(paper).
Capacity
of Optical Fiber Channels:
We compute the Shannon limit for optical fiber channels with
hard and soft decision. Both the ultimate channel capacity
(optimal channel input) and the practical channel capacity
(equal probability of channel input) are considered.
- Asymmetric Chi-square channel is by far the most
accurate channel model for optical fiber communications
employing optical amplifier. We investigate the capacity
of Chi-square channels with contineous output (soft-decision)
and binary output (hard-decision)
(paper).
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