Results 171 to 180 of about 23,935 (248)

Low-density parity-check (LDPC) coded OFDM systems

IEEE 54th Vehicular Technology Conference. VTC Fall 2001. Proceedings (Cat. No.01CH37211), 2002
Orthogonal frequency division multiplexing (OFDM) is a very attractive technique for high-bit-rate data transmission in a multipath fading environment that causes intersymbol interference (ISI). There are many error-correcting codes applied to OFDM, convolutional codes, Reed-Solomon codes, turbo codes, and so on.
H. Futaki, T. Ohtsuki
openaire   +1 more source

Low-density parity-check code (LDPC) schemes with BICM

International Conference on Communication Technology Proceedings, 2003. ICCT 2003., 2004
LDPC codes are serious opponent of turbo codes. This paper presents LDPC schemes using bit-interleaving coded modulation (BICM), which can increase the spectral efficiency two or three times with little loss of power efficiency. And the decoding complexity is also addressed in this paper.
null Hai-Gang Zhang, null Dong-Feng Yuan, null Pi-Ming Ma, null Xiu-Mei Yang   +3 more
openaire   +1 more source

Low density parity check (LDPC) codes for optical data storage

International Symposium on Optical Memory and Optical Data Storage Topical Meeting, 2003
Low-density parity check (LDPC codes, first introduced by Gallager (1962), are error-correcting codes based on very sparse parity check matrices. Recently, in the wake of excellent performance of turbo codes, LDPC codes were rediscovered as another category of random codes approaching the Shannon capacity limit with practical decoding complexity ...
V. Bhagavatula, null Hongwei Song, null Jingfeng Liu   +2 more
openaire   +1 more source

Performance of low-density parity-check (LDPC) coded OFDM systems

2002 IEEE International Conference on Communications. Conference Proceedings. ICC 2002 (Cat. No.02CH37333), 2003
Orthogonal frequency division multiplexing (OFDM) is a very attractive technique for high-bit-rate data transmission in multipath environments. Many error-correcting codes have been applied to OFDM. Recently, LDPC codes have attracted much attention. The performance of LDPC codes is very close to the Shannon limit, with practical decoding complexity ...
H. Futaki, T. Ohtsuki
openaire   +1 more source

Bootstrapped Iterative Decoding Algorithms for Low Density Parity Check (LDPC) Codes

2010 Fifth International Conference on Systems and Networks Communications, 2010
Reliability ratio based weighted bit-flipping algorithm is one of the best hard decision decoding algorithms in performance. Recently several modifications are done to this technique either to improve performance or to lower the complexity. The implementation efficient reliability ratio based weighted bit-flipping is developed targeting decreasing ...
Albashir Adel Mohamed, Maha Mohamed Elsabrouty, Salwa Hussien El-Ramly   +2 more
openaire   +1 more source

Low-Density Parity-Check (LDPC) Coded Framelet Transform-Based OFDM System

Proceedings of the International Conference on Imaging, Signal Processing and Communication, 2017
Framelet Transform-based OFDM (FT-OFDM) was proposed recently as an alternative to traditional Fast Fourier Transform-based OFDM (FFT-OFDM). By using the Framelet Transform, the spectral containment of the channels will be more efficient, since it does not use Cyclic Prefix (CP) that usually used in the traditional model.
Suha Q. Hadi, Phaklen Ehkan, Sameer A. Dawood, M. S. Anuar   +3 more
openaire   +1 more source

Optimized low-density parity-check (LDPC) codes for bandwidth efficient modulation

2003 IEEE 58th Vehicular Technology Conference. VTC 2003-Fall (IEEE Cat. No.03CH37484), 2003
In this paper, we implement an efficient MLC/PDL system for AWGN channels. In terms of the tradeoff between hardware implementation and system performance, proposed LDPC code is optimized by Gaussian approximation (GA) according to the rate of each level assigned by the capacity rule and chosen as the component code.
null Yu Yi, null Moon Ho Lee
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DC-free (d, k) constrained low density parity check (LDPC) codes

International Symposium on Optical Memory and Optical Data Storage Topical Meeting, 2003
Recently, turbo codes and low-density parity check (LDPC) codes with iterative soft decoding have been heavily investigated as potential candidates for low-SNR, high-density data storage systems. However, relatively less attention has been devoted to the investigation of (d, k) run-length limited (RLL) constrained LDPC codes, although run-length ...
H. Song, J. Liu, B.V.K.V. Kumar
openaire   +1 more source

Concatenated low density parity check (LDPC) codes for magnetic recording channels

Digest of INTERMAG 2003. International Magnetics Conference (Cat. No.03CH37401), 2004
In this paper discussed for magnetic recording channels, a concatenated LDPC coding scheme which employs a column weight LDPC inner code and an outer LDPC code with large column weight to handle the residual errors.
null Hongwei Song, null Jingfeng Liu, B.V.K. Vijaya Kumar   +2 more
openaire   +1 more source

Low-density parity-check (LDPC) coded OFDM systems with M-PSK

Vehicular Technology Conference. IEEE 55th Vehicular Technology Conference. VTC Spring 2002 (Cat. No.02CH37367), 2003
Orthogonal frequency division multiplexing (OFDM) is a very attractive technique to achieve the high-bit-rate transmission required for future mobile communications. To improve the error rate performance of OFDM, forward error correction coding is essential.
H. Futaki, T. Ohtsuki
openaire   +1 more source