An Unequal Error Protection Scheme using Parallel Concatenated Low-Density Parity-Check Code
Date Issued
2007
Date
2007
Author(s)
Chang, Chin-Wen
DOI
en-US
Abstract
Transmitting visible applications over wireless networks is
a challenging work. Bandwidth, channel noise, and heterogeneous receivers are critical factors which will
affect the quality of visible applications. Thus cross-layer
design of wireless network is proposed to address these
problems. In general cross-layer design, Unequal Error
Protection(UEP) is an important work to address noisy
transmission channel and adaptive transmission rate.
So we want to propose an UEP scheme using Parallel
Concatenated LDPC Code(PCGC). PCGC is a powerful code whose
BER performance is better than LDPC code under some
constraints. In this thesis, we propose a new kind of
stopping criterion to reduce long latency of PCGC decoding.
Besides, we introduce some puncturing methods for finite
length LDPC code and propose a puncturing scheme for PCGC
system. Finally, we will propose an UEP scheme which uses
PCGC as its error-correcting code. In the work of stopping
criteria, we want to propose a local stopping criterion to
couple with existing global stopping criteria. In the work
of puncturing, we let the mentioned puncturing methods to
select recommended punctured-bits in individual constituent
codes of PCGC, and then to propose how to select
punctured-bits over all PCGC system. In the final work, we
will propose an application and channel aware UEP scheme in
the viewpoint of relation between frame PSNR and decoded
BER. Finally, we will show the performances to verify
advantages of our works.
Subjects
不等量錯誤保護
平行串接式低密度奇偶校驗碼
低密度奇偶校驗碼
停止準則
消去
UEP
PCGC
LDPC
Stopping Criterion
Puncturing
Type
thesis
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