In this paper, we reinterpret the (k + 2, k) zigzag code in coding matrix and then propose an optimal exact repair strategy for its parity nodes, whose repair disk I/O approaches a lower bound derived in this paper.
In this paper, we reinterpret the (k + 2, k) zigzag code in coding matrix and then propose an optimal exact repair strategy for its parity nodes, whose repair disk I/O approaches a lower bound derived in this paper.
An extending approach to the concept of the product of context and ambiguous. In this article, we present the concept of overlap product, where contextual words are inserted among code words and strings reduced by the...
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ISBN:
(纸本)9783319999968;9783319999951
An extending approach to the concept of the product of context and ambiguous. In this article, we present the concept of overlap product, where contextual words are inserted among code words and strings reduced by the common overlapping context. Thus, the concept of code on the basis of overlap product is created, also called O-code. The initial results on the properties and conditions for decoding are the basis to establish an effective algorithm for testing of O-codes with the complexity of n(3).
This paper gives the performance analysis of Interleave Division Multiple Access (IDMA) with different coding techniques. Convolutional coding and zigzag coding techniques are used to improve the capacity of a channel...
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ISBN:
(纸本)9783642184390
This paper gives the performance analysis of Interleave Division Multiple Access (IDMA) with different coding techniques. Convolutional coding and zigzag coding techniques are used to improve the capacity of a channel. A new multiple access scheme has been introduced which employs the chip level interleaving as the only means of user separation. coded IDMA is compared with un coded IDMA in this paper.
This paper compares the turbo code and rate-compatible low-density parity-check (LDPC) codes based on the block error rate (BLER) performance and decoding complexity in order to clarify which channel coding scheme is ...
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This paper compares the turbo code and rate-compatible low-density parity-check (LDPC) codes based on the block error rate (BLER) performance and decoding complexity in order to clarify which channel coding scheme is most appropriate for the channel coding scheme in the OFDM based Evolved UTRA (E-UTRA) downlink. Simulation results and the decoding complexity analysis show that although the Rate-Compatible/Quasi-Cyclic (RC/QC)-LDPC code employing an offset layered belief propagation (BP) method can reduce the computational complexity by approximately 30% for the channel coding rate of R >= 1/2, the required average received signal energy per bit-to-noise power spectrum density ratio (E-b/N-0) is degraded by approximately 0.2-0.3 dB for R = 1/3, 1/2 and 3/4 compared to that for the turbo code. Moreover. the decoding complexity level of the RC/QC-LDPC code with the delta-min algorithm is almost the same or higher than that for the turbo code with a slight degradation in the required received E-b/N-0. Although the decoding complexity level of the zigzag code is lower than that of the turbo code, the code brings about a distinct loss in the required average received E-b/N-0 of, approximately 0.4 dB. Finally, the turbo Single Parity Check (SPC) code improves the BLER performance compared to the zigzag code, i.e., achieves almost the same BLER performance as that for the turbo code, at the cost of a twofold increase in the decoding complexity. As a result, we conclude that the turbo code with a contention free interleaver is more promising than the LDPC codes for prioritizing the achievable performance over complexity and as the channel coding scheme for the shared data channel ill the E-UTRA.
One of the challenges of broadband wireless multimedia networks is to design a wireless data link control (W-DLC) protocol which provides reliable data delivery over the noisy wireless link in an efficient manner. Thi...
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One of the challenges of broadband wireless multimedia networks is to design a wireless data link control (W-DLC) protocol which provides reliable data delivery over the noisy wireless link in an efficient manner. This paper presents our proposal of such a W-DLC protocol, based on a new coding scheme called multidimensional concatenated zigzag code. Both real-time and non-real-time traffic can be efficiently supported by adopting different error control mechanisms. A distinct feature of the protocol is that the coding rate can be adapted to a wide range of channel conditions. Hence, our protocol utilizes the scarce wireless channel resources more efficiently. Copyright (c) 2005 John Wiley & Sons, Ltd.
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