these.rar - The Low-Density Parity-Check codes are among the most powerful forward error correcting
codes, since they enable to get as close as a fraction of a dB the Shannon limit.
This astonishing performance combined with their relatively simple decoding algorithm
make these codes very attractive for the next digital transmission system generations. It
is already the case for the next digital satellite broadcasting standard (DVB-S2), where
an irregular LDPC code has been chosen to protect the downlink information.,2016-03-03 20:56:59,下载2次
New-Iterative-Decoding-Algorithms-for-Low-Density - Low-Density Parity-Check (LDPC) codes have gained lots of popularity due to their
capacity achieving/approaching property. This work studies the iterative decoding
also known as message-passing algorithms applied to LDPC codes. Belief propagation
(BP) algorithm and its approximations, most notably min-sum (MS), are popular
iterative decoding algorithms used for LDPC and turbo codes. The thesis is divided
in two parts. In the rst part, a low-complexity binary message-passing algorithm
derived the dynamic of analog decoders is presented and thoroughly studied.
In the second part, a modi cation for improving the performance of BP and MS
algorithms is proposed. It uses adaptive normalization of variable node message,2016-03-03 20:54:57,下载2次
bit-for-ldpc.rar - A novel class of bit-flipping (BF) algorithms for
decoding low-density parity-check (LDPC) codes is presented.
The proposed algorithms, which are called gradient descent bit
flipping (GDBF) algorithms, can be regarded as simplified gradient
descent algorithms. Based on gradient descent formulation,
the proposed algorithms are naturally derived a simple
non-linear objective function,2016-03-03 20:52:47,下载10次
CRACK.rar - Why LDPC Codes are Strong
Candidates for Next Generation
Wireless Systems
♦ Next Generation Wireless Systems typically require higher
data throughput in a given bandwidth
• High rate FEC with higher order modulation (e.g. cdma2000 EVDV,
HSDPA) is required
• Applications require high speed by default permit use of long
blocks
♦ Turbo codes tend to lose performance at high code rates due
to excessive puncturing, turbo trellis codes become rather
complex to implement for higher order modulation
,2016-03-03 20:48:52,下载3次
ldpc_cc.zip - Low-density parity-check convolutional codes offer
the same good error-correcting performance as low-density
parity-check block codes while having the ability to encode and
decode arbitrary lengths of data. This makes these codes well
suited to certain applications, such as forward error control on
packet switching networks.
In this paper we propose a decoder architecture for low-density
parity-check convolutional codes with very large memories. These
codes have very good error correcting properties and as such
may be applicable in space and satellite communication systems.
We discuss a realization of this architecture implemented on a
eld-programmable gate array,2016-03-03 20:38:33,下载17次