Results 251 to 260 of about 765,447 (285)

Error floors in narrowband digital FM systems

Proceedings IEEE SOUTHEASTCON '97. 'Engineering the New Century', 2002
A digital FM system in the presence of simulcast interference and/or Rayleigh fading exhibits performance floors, where increased signal strength does not reduce the error rate. The mechanism which generates FM clicks even in the region of high SNRs, in simulcast as well as in multipath, is suggested.
R. Petrovic, S. Filipovic
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Lowering Error Floors Using Dithered Belief Propagation

2010 IEEE Global Telecommunications Conference GLOBECOM 2010, 2010
We propose dithered belief propagation decoding algorithms to reduce the number of decoding failures of a belief propagation decoder and lower the error floor. The random nature of the algorithms enables a low hardware complexity compared to previously reported techniques. We introduce two dithering methods that target check node operations and channel
Francois Leduc-Primeau, Saied Hemati, Shie Mannor, Warren J. Gross   +3 more
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Error floors of non-binary LDPC codes

2010 IEEE International Symposium on Information Theory, 2010
In this paper, we analyze (2, k)-regular non-binary low-density parity-check codes over the binary erasure channels. We propose a method to improve the error floors by optimizing labels in zigzag cycles in the Tanner graph. We analyze the error floors for codes designed by the proposed optimization method and show that the error floors are decreasing ...
Takayuki Nozaki, Kenta Kasai, Kohichi Sakaniwa   +2 more
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On error floor and free distance of turbo codes

ICC 2001. IEEE International Conference on Communications. Conference Record (Cat. No.01CH37240), 2002
Turbo codes have excellent performance at low and medium signal-to-noise ratios (SNR) very close to the Shannon limit, and are at the basis of their success. However, a turbo code performance curve can change its slope at high SNR if the code free distance is small.
GARELLO, Roberto, CHIARALUCE F, PIERLEONI P, SCALONI M, BENEDETTO, Sergio   +4 more
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Error floor analysis

2009
Introduction In the previous chapter we analyzed the performance of iterative codes by calculating their threshold and thus comparing their performance in high-noise channels with the channel's capacity. In that analysis we considered the iterative decoding of code ensembles with given component codes, averaging over all possible interleaver–edge ...
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In-service testing OFDM error floor by constellation analysis

2017 25th International Conference on Software, Telecommunications and Computer Networks (SoftCOM), 2017
Residual BER – error floor is the ultimate metrics for the end-to-end transmission performance, but in practice can be assessed only by out-of-service tests, which network operators in particular try to avoid best they can, preferring in-service practical test methods. In this regard, constellation analysis is an excellent tool to not only identify and
Lipovac, Adriana, Isak-Zatega, Sibila, Njemčević, Pamela   +2 more
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Short Low-Error-Floor Tanner Codes with Hamming Nodes

MILCOM 2005 - 2005 IEEE Military Communications Conference, 2006
While it is fairly easy to design good low-density parity-check codes with medium or large block lengths, and with code rates 1/2 or greater, much more effort is required for short lengths and low rates. We propose a code structure which incorporates Hamming codes into a code's graph, leading to a type of a Tanner code.
Liva, Gianluigi, Ryan, William E.
openaire   +2 more sources

Rate Variable, Multi-Binary Turbo Codes with Controlled Error-Floor

IEEE Transactions on Communications, 2009
In this letter we propose rate variable turbo codes based on the parallel concatenation of tailbiting Recursive Systematic multi-binary (m-ary) convolutional codes. Rate variability is not achieved by puncturing, which can have adverse effects on the minimum distance of the code.
FERRARI M, BELLINI, SANDRO
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Protograph Based Low Error Floor LDPC Coded Modulation

MILCOM 2005 - 2005 IEEE Military Communications Conference, 2006
In this paper we propose an innovative LDPC coded modulation scheme. We design binary low density parity check (LDPC) codes that are combined with high level modulations such as 8PSK and 16QAM with and without a channel interleaver. At the receiver a demapper transforms the received inphase and quadrature samples to produce reliability information that
D. Divsalar, C. Jones
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A survey of error floor of LDPC codes

2011 6th International ICST Conference on Communications and Networking in China (CHINACOM), 2011
The research about error floor of finite-length LDPC code is a very hot topic recently. This survey briefly introduces the existing works in lowering and estimating error floor of LDPC codes, and sheds some light on some potential future research areas.
null Yejun He, null Jie Yang, null Jiawei Song   +2 more
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