In this paper, we propose to study and optimize a very general class of LDPC codes whose variable nodes belong to finite sets with different orders. We named this class of codes hybrid LDPC codes. Although efficient optimization techniques exist for binary LDPC codes and more recently for non-binary LDPC codes, they both exhibit drawbacks due to different reasons. Our goal is to capitalize on t...

In this paper, a new repair scheme for modified construction of MDS codes is studied. The obtained has optimal bandwidth multiple failed nodes under the cooperative model. addition, relatively low access property, where number data accessed less than two times value.

In this paper, we examine the locality property of the original Fractional Repetition(FR) codes and propose two constructions for FR codes with better locality. For this, we first derive the capacity of the FR codes with locality 2, that is the maximum size of the file that can be stored. Construction 1 generates an FR code with repetition degree 2 and locality 2. This code is optimal in the se...

In this paper, we present a method to construct rate-compatible convolutional (RCC) codes from known high-rate punctured convolutional codes, obtained from best-rate 1/2 codes. The construction method is rather simple and straightforward, and still yields good codes. Moreover, low rate codes can be obtained without any limit on the lowest achievable code rate. Based on the RCC codes, a generali...

This paper focuses on a new class of flexible hybrid concatenated codes which are able to achieve any desired bit error rate performance between that of a parallel and serial concatenated convolutional code. The main contribution of this paper is a convergence analysis of the decoder, which is facilitated by an alternative representation of the code structure and an extrinsic information (EXIT)...

We propose and demonstrate an all-optical sub-carrier label-swapping subsystem with 2R regeneration and wavelength conversion. The experimental results show error-free operation as well as regenerating operation with negative power penalty. 2003 Optical Society of America OCIS codes: 060.2330 Fiber optics communications, 060.4510 Optical communications