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In this paper, we propose an encoding scheme for partitioned linear block codes (PLBC) which mask the stuck-at defects in memories. In addition, we derive an upper bound and the estimate of the probability that masking fails. Numerical results show that PLBC can efficiently mask the defects with the proposed encoding scheme. Also, we show that our upper bound is very tight by using numerical results.
By concatenating an outer Reed-Solomon code with an inner multilevel space-time code, the concatenated scheme can achieve large coding gain with low decoding complexity. In this paper, a novel concatenated space-time coding scheme is proposed. Further coding gain can be attained if the inner multilevel space-time code is modified by the interlevel coding design between adjacent blocks. The error performance...
Extended orthogonal space time block code (EO-STBC) schemes were demonstrated that they can achieve a significant improvement in performance for closed-loop multiple antenna systems with limited feedback channel. This paper investigates a new closed-loop multiple antenna scheme for four transmit antennas and single receive antenna under quasi-static flat Rayleigh fading. In comparison to conventional...
Error control is significant to network coding, since when unchecked, errors greatly deteriorate the throughput gains of network coding and seriously undermine both reliability and security of data. Two families of codes, subspace and rank metric codes, have been used to provide error control for random linear network coding. In this paper, we enhance the error correction capability of these two families...
In this paper we propose a system where we divide the group with 2 symbols. The two added symbols are separated by multiplexing and later added using the DE-multiplexing technique. In our propose system a simple Partial Interference Cancelation (PIC) group decoding scheme is used for Double-ABBA Quasi-Orthogonal Space Time Code, which reduces the decoding complexity for the higher order Multiple Input...
In this paper, we separate the symbols in the layered basis and then find the equivalent channel matrix. Based on the equivalent channel matrix we provide the grouping scheme. In our paper, we construct a block wise transmission technique which will achieve the desired code rate and reduce the decoding complexity.
Spatially-coupled codes have low-complexity structures and a low-delay decoding architecture, which nominate them as a very desirable candidate for communication standards. In this paper, a study on the asymptotic performance of spatially-coupled ensembles over the binary erasure channel (BEC) with density evolution analysis based on the belief-propagation algorithm is conducted. We identify all possible...
Increasing the pipeline depth of bit-parallel message-passing low-density parity-check (LDPC) decoders can be done by increasing the number of simultaneously decoded frames, or by decreasing the amount of parallelism in the decoder. In digit-serial decoders, the pipeline depth can also be increased by increasing message precision. Digit-online decoders are a class of digit-serial decoders that use...
Soft-based linear block codes combined with linear modulation cannot obtain coding gains by increasing the number of iterations. In this paper, we propose rate-compatible turbo product codes with extended BCH codes using zero padding and shortening the row and/or column to adapt a next-generation (NG) Digital Video Broadcasting-Return Channel by Satellite (DVB-RCS) system. In addition, in order to...
In modern telecommunication systems, FEC has been widely used. The emergence and development of this technology is the need of the telecommunication system itself. In the engineering practice, the ideal digital channel does not exist, which results from distortion and non-isochronous delay. Such result means generating error and jitter, which finally can be reflected in the error code of the system...
Random Linear Network Coding (RLNC) currently attracts a lot of attention as a technique to disseminate information in a network. In this contribution, non-coherent multi-shot RLNC is considered, that means, the unknown and time variant network is used several times. In order to create dependencies between the different shots, convolutional network codes are used, in particular Partial Unit Memory...
Cooperation diversity schemes employing distributed spacetime block coding (STBC) techniques have been proposed for wireless networks to increase system capacity and coverage even when each node is only equipped with a single antenna. Capitalizing on randomized STBC, a decentralized coding method that has been developed for decode-and-forward relaying, a cooperative communication protocol is proposed...
A new space-time block code (STBC) is presented for distributed 4 × 2 multiple-input multiple-output (MIMO) systems. A 2 × 2 full-rate full-diversity (FR-FD) low complexity space-time code, presented by Sezginer and Sari, is employed for two distributed links. Alamouti STBC is applied over the two links to obtain a double layer space-time block code (DLSTBC) providing full diversity in a distributed...
We propose a simple yet effective wireless network coding (NC) and decoding technique. It utilizes spatial diversity through cooperation between nodes which carry out distributed encoding operations dictated by generator matrices of linear block codes. For this purpose, we make use of greedy codes over the binary field and show that desired diversity orders can be flexibly assigned to nodes in a multiple...
OFDM with Quadrature amplitude modulation (QAM) technique can be used for high speed optical applications. As the order of modulation increases, the bit error rate (BER) increases. Forward Error correction (FEC) coding like LDPC coding is generally used to Improve BER performance. LDPC provides large minimum distance and also the power efficiency of the LDPC code increases significantly with the code...
A new cooperative transmission protocol with network coding scheme for synchronized multi-source system are proposed. The users are organized into two groups. The users in different groups transmit in distinct time slots, while the users in the same group transmit with orthogonal waveforms. In each transmission, the user transmits his own information and relays other users' information at the same...
Space-time block codes (STBCs) have attracted considerable attention as they provide reliable communication in multi-antenna systems. STBCs work on the principle of multiple transmissions of a data stream from different transmit antennas in multiple time slots. This redundancy reduces the data rate of the STBCs. In this paper, we propose a mapping function for PAM and square QAM constellation. Based...
In this paper, we present an error-trellis construction for tailbiting convolutional codes. A tailbiting error-trellis is characterized by the condition that the syndrome former starts and ends in the same state. We clarify the correspondence between code subtrellises in the tailbiting code-trellis and error subtrellises in the tailbiting error-trellis. Also, we obtain the scalar parity-check matrix...
In the conventional Space-Time Block Code (STBC) scheme, system can't achieve the full diversity and full rate for more than two transmitting antennas. Thereafter, a Quasi-Orthogonal STBC (QOSTBC) has been provided to improve the diversity and full rate behavior for the STBC with more than two transmitting antennas. However, QOSTBC has the drawback of heavy computational burden for the receiver. This...
In this paper, we consider the design of a binary network coding scheme for the wireless broadcast, in which the same packet sequence is broadcasted to multiple receivers. In the proposed coding scheme, a short block code is employed for the coding across the broadcasted packets to generate redundant packets to recover the lost packets for all terminals in the service. In particular, we assume the...
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