Results 121 to 130 of about 294 (197)
Spatiotemporal Big Data Retrieval Method Based on GeoHash Algorithm and Multimode Composite Index
Modelling and Simulation in Engineering, Volume 2026, Issue 1, 2026.With the increasing demand for multisource heterogeneous spatiotemporal data in applications such as smart cities and intelligent transportation, how to balance retrieval accuracy, multimodal adaptation, and high concurrency response has become a key issue.
Yanxin Wang, Federica Proietto
wiley +1 more source
Spatially-Coupled Serially Concatenated Codes with Periodic Convolutional Permutors
2021 11th International Symposium on Topics in Coding (ISTC), 2021 Spatially-coupled serially concatenated codes (SC-SCCS) are a class of turbo-like codes constructed by interconnecting a sequence of SCCS using a set of block permutors. At short block lengths, however, the bit-error-rate (BER) performance of SC-SCCS constructed by independent block permutors exhibits a high error floor.
Muhammad Umar Farooq +2 more
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Interleaver Design for Serial Concatenated Convolutional Codes
IEEE Communications Letters, 2004 In this paper, we present an interleaver design method for SCCC. Our design criterion is to minimize the message-round probability in the SCCC graph which is specially well suited for SCCC. The message-round probability characterizes the message flow in the SCCC graph. By minimizing it, we can get a large interleaving gain.
Jiangying Yu +4 more
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Design of punctured serially concatenated convolutional codes
IEEE Communications Letters, 2005 An effective algorithm for the design of punctured serially concatenated convolutional codes (SCCCs) is proposed. The algorithm is based on the density evolution technique, and its main goal is to design a code matching the outer and the inner encoder in order to reduce the bit error rate (BER) in the SNR operating region ranging from the waterfall to ...
Massimiliano Laddomada, B. Scanavino
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Iterative MAP decoding for serial concatenated convolutional codes
IEE Proceedings - Communications, 1998 The paper provides detailed computational steps for implementing an iterative serial concatenated convolutional code (SCCC) decoder. These are based on maximum a posteriori probability (MAP) decoding of a single, rate 1/2, recursive, systematic convolutional code, which is reduced to easily implemented equations for forward and backward recursion.
Marcel Ambroze +2 more
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Serially concatenated codes with euclidean geometry LDPC and convolutional codes
2012 IEEE International Conference on Communication Systems (ICCS), 2012 This paper presents a new scheme of serially concatenated codes. It is formed by a combination of Euclidean Geometry (EG) Low Density Parity Check (LDPC) and Recursive Systematic Convolutional (RSC) codes linked by the row-column interleaver. A modification is proposed on the interleaver, which improves performance of concatenated codes.
Sina Vafi, Huu Dung Pham
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Iterative decoding of serially concatenated convolutional codes and MSK
IEEE Communications Letters, 1999 The performance of iterative decoding and demodulation of serially concatenated convolutional codes and minimum shift keying (MSK) is studied. It is shown that by appropriately combining the trellises of MSK and the inner code, a high performance coded modulation system can be achieved.
Victor F. Szeto, S. Pasupathy
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On the design of binary serially concatenated convolutional codes
1999 IEEE Communications Theory Mini-Conference (Cat. No.99EX352), 1999 The serial concatenation of simple binary convolutional codes through an interleaver is a technique that yields, through iterative decoding, performance similar to, and in some cases better than, those of turbo codes (parallel concatenated convolutional codes).
Sergio Benedetto +3 more
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An iterative decoding scheme for serially concatenated convolutional codes
Proceedings of 1995 IEEE International Symposium on Information Theory, 2002 We present an iterative soft-output decoding algorithm for serially concatenated convolutional codes which has better performance than the conventional noniterative decoding algorithm. The proposed Viterbi decoding scheme can be used whenever some form of serial concatenation of encoders and channels with memory is applied.
Mohamed Siala +3 more
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Hybrid ARQ using serial concatenated convolutional codes over fading channels
IEEE VTS 53rd Vehicular Technology Conference, Spring 2001. Proceedings (Cat. No.01CH37202), 2002 In this paper, we propose and analyze a new hybrid FEC/ARQ scheme using rate compatible punctured serial concatenated convolutional codes (SCCCs) which is suitable for flat-fading channels. Puncturing increases the transmitted code rate, and the rate compatibility criterion allows incremental redundancy to be transmitted after each decoding failure ...
Naveen Chandran, Matthew C. Valenti
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