The Experts below are selected from a list of 106977 Experts worldwide ranked by ideXlab platform
Hideki Ochiai - One of the best experts on this subject based on the ideXlab platform.
-
performance analysis and Interleaver structure optimization for short frame bicm ofdm systems
IEEE Transactions on Wireless Communications, 2016Co-Authors: Yuta Hori, Hideki OchiaiAbstract:Bit-interleaved coded modulation (BICM), together with orthogonal frequency-division multiplexing (OFDM) signaling, has found its application in many recent wireless standards. BICM–OFDM systems are able to simplify the design of coding and modulation with various information rates for link adaptation. Furthermore, they provide robustness against frequency-selective fading channels. The combination of BICM–OFDM and convolutional code turns out to be attractive as it allows for low complexity and low latency decoding architecture at the receiver. It has been known that the performance of convolutionally coded BICM–OFDM systems depends on the bit Interleaver structure, but little attention has been paid for its theoretical performance analysis. In this paper, we develop a novel theoretical expression for approximate BER of convolutionally coded BICM–OFDM that can be used for evaluating the performance of a given bit Interleaver structure, and propose a design guideline for its optimization. Numerical comparisons between the optimized Interleaver that satisfies our guideline and other random and structured Interleavers demonstrate the validity of our design criterion.
-
Performance Analysis and Interleaver Structure Optimization for Short-Frame BICM–OFDM Systems
IEEE Transactions on Wireless Communications, 2016Co-Authors: Yuta Hori, Hideki OchiaiAbstract:Bit-interleaved coded modulation (BICM), together with orthogonal frequency-division multiplexing (OFDM) signaling, has found its application in many recent wireless standards. BICM-OFDM systems are able to simplify the design of coding and modulation with various information rates for link adaptation. Furthermore, they provide robustness against frequency-selective fading channels. The combination of BICM-OFDM and convolutional code turns out to be attractive as it allows for low complexity and low latency decoding architecture at the receiver. It has been known that the performance of convolutionally coded BICM-OFDM systems depends on the bit Interleaver structure, but little attention has been paid for its theoretical performance analysis. In this paper, we develop a novel theoretical expression for approximate BER of convolutionally coded BICM-OFDM that can be used for evaluating the performance of a given bit Interleaver structure, and propose a design guideline for its optimization. Numerical comparisons between the optimized Interleaver that satisfies our guideline and other random and structured Interleavers demonstrate the validity of our design criterion.
-
A simple Interleaver design for variable-length turbo codes
2010 6th International Symposium on Turbo Codes & Iterative Information Processing, 2010Co-Authors: Ken Enokizono, Hideki OchiaiAbstract:Performance of short-length turbo code is largely determined by the Interleaver structure. This paper proposes a new Interleaver design based on an extension of S-random Interleavers. The proposed Interleaver makes use of several short length S-random Interleavers to construct an Interleaver of longer length. Since S-random Interleavers of short length are easily found by computer search, the overall complexity of constructing longer-length Interleaver is relatively low while retaining comparable performance with regular S-random Interleavers of full length. The major advantage of the proposed Interleaver is its robustness against pruning of the Interleaver length and thus suitable for the system that requires variable-length turbo codes.
Yuta Hori - One of the best experts on this subject based on the ideXlab platform.
-
Performance Analysis and Interleaver Structure Optimization for Short-Frame BICM–OFDM Systems
IEEE Transactions on Wireless Communications, 2016Co-Authors: Yuta Hori, Hideki OchiaiAbstract:Bit-interleaved coded modulation (BICM), together with orthogonal frequency-division multiplexing (OFDM) signaling, has found its application in many recent wireless standards. BICM-OFDM systems are able to simplify the design of coding and modulation with various information rates for link adaptation. Furthermore, they provide robustness against frequency-selective fading channels. The combination of BICM-OFDM and convolutional code turns out to be attractive as it allows for low complexity and low latency decoding architecture at the receiver. It has been known that the performance of convolutionally coded BICM-OFDM systems depends on the bit Interleaver structure, but little attention has been paid for its theoretical performance analysis. In this paper, we develop a novel theoretical expression for approximate BER of convolutionally coded BICM-OFDM that can be used for evaluating the performance of a given bit Interleaver structure, and propose a design guideline for its optimization. Numerical comparisons between the optimized Interleaver that satisfies our guideline and other random and structured Interleavers demonstrate the validity of our design criterion.
-
performance analysis and Interleaver structure optimization for short frame bicm ofdm systems
IEEE Transactions on Wireless Communications, 2016Co-Authors: Yuta Hori, Hideki OchiaiAbstract:Bit-interleaved coded modulation (BICM), together with orthogonal frequency-division multiplexing (OFDM) signaling, has found its application in many recent wireless standards. BICM–OFDM systems are able to simplify the design of coding and modulation with various information rates for link adaptation. Furthermore, they provide robustness against frequency-selective fading channels. The combination of BICM–OFDM and convolutional code turns out to be attractive as it allows for low complexity and low latency decoding architecture at the receiver. It has been known that the performance of convolutionally coded BICM–OFDM systems depends on the bit Interleaver structure, but little attention has been paid for its theoretical performance analysis. In this paper, we develop a novel theoretical expression for approximate BER of convolutionally coded BICM–OFDM that can be used for evaluating the performance of a given bit Interleaver structure, and propose a design guideline for its optimization. Numerical comparisons between the optimized Interleaver that satisfies our guideline and other random and structured Interleavers demonstrate the validity of our design criterion.
M. Shukla - One of the best experts on this subject based on the ideXlab platform.
-
Analysis of numerical Interleaver for IDMA scheme
2017 7th International Conference on Communication Systems and Network Technologies (CSNT), 2017Co-Authors: Shubham Srivastava, Shivani Dixit, M. ShuklaAbstract:This research work presents a novel numerical Interleaver for generation of user specific interleaving sequences, for interleave-division multiple-access (IDMA) system. In general, all the interleaving sequences, used by users, need to be transferred to receiver side for extracting the user specific data with help of de-interleaving process. In the proposed Interleaver, there is no need to transfer any interleaving sequences to the receiver. This Interleaver eliminates the problem of high consumption of bandwidth as the interleaved sequences depend only on few parameters and it can be easily generated at the receiver if receiver system is aware of these parameters. To make comparison with other Interleavers, the bit error rate (BER) performance analysis has been performed under Additive White Gaussian Noise (AWGN) channel conditions based on the computer MATLAB simulations. The simulation results demonstrate that the proposed numerical Interleaver provides better BER performance since it allows the communication system to easily check for more orthogonal interleaving patterns by changing the values of few parameters.
-
Rotational Interleaver for Iterative Interleave-Division Multiple-Access Scheme
2012 International Conference on Communication Systems and Network Technologies, 2012Co-Authors: Kulbhushan Gupta, C.k. Shukla, Sugandha Sharma, Akahay Saxena, M. ShuklaAbstract:In iterative IDMA scheme, the users are distinguished with various chip-level interleaving sequences instead of user-specific signature sequences as in conventional code-division multiple-access (CDMA) scheme. A set of Interleavers is considered to be practical if it has zero correlation with each other and also easy to generate as well requires minimal bandwidth during communication process. A properly defined correlation between user-specific Interleavers can be utilized to formulate a minimal collision criterion, where zero-correlation (i.e., orthogonality) implies no collision. In this paper, a practical Interleaver has been proposed for interleave-division multiple-access (IDMA) systems. Simulation results show that the proposed Interleaver performs even better to random Interleavers initially reported for iterative IDMA system.
-
Performance Evaluation of Modulation Techniques with Iterative IDMA Receivers Using Optimum Tree Based Interleaver
2011 International Conference on Communication Systems and Network Technologies, 2011Co-Authors: Kulbhushan Gupta, C.k. Shukla, Shashi Tiwari, M. ShuklaAbstract:The Interleave-Division Multiple-Access (IDMA) scheme is known for property of orthogonality amongst its user-specific Interleavers. The Interleavers are, therefore, referred has the heart of IDMA Transceivers. In the literature, researchers have proposed Tree Based Interleaver (TBI) which not only reduces the bandwidth requirement in comparison to that required in case of Random Interleavers (RI) but also reduces computational complexity drastically when compared with that of power Interleavers. The memory requirement at receiver end and its cost problem are also solved by tree based Interleaver with further reduction of the amount of information exchange between mobile stations and base stations required to specify the user-specific Interleavers. In this paper, the performance analysis of iterative IDMA receivers have been evaluated with BPSK & QPSK modulation techniques employing tree based Interleavers and random Interleavers in uncoded and rate 1/2 covolutionally coded conditions with Additive White Gaussian Noise (AWGN) channel. During the simulation, it has been observed that IDMA system with QPSK modulation techniques employing TBI outperforms its counterparts optimally.
-
Performance analysis of tree based Interleaver with iterative IDMA receivers using optimum power allocation algorithm
2009 First UK-India International Workshop on Cognitive Wireless Systems (UKIWCWS), 2009Co-Authors: M. Shukla, R. C. S. Chauhan, Ruchir Gupta, V. K. Srivastava, S. TiwariAbstract:This paper is concerned with the performance improvement of iterative Interleave-Division Multiple-Access (IDMA) scheme based receivers using optimum power allocation algorithm using tree based Interleavers (TBI). Based on the optimized power allocation technique, we compare the performance of IDMA receiver with random Interleaver, power Interleaver, and tree based Interleaver. The simulation results demonstrate the superior performance of tree based Interleaver in comparison to other Interleavers in view of memory requirement and computational complexity along with similar BER performance.
S. Tiwari - One of the best experts on this subject based on the ideXlab platform.
-
analysis and design of optimum Interleaver for iterative receivers in idma scheme
Communications and Mobile Computing, 2009Co-Authors: Manoj Kumar Shukla, V. K. Srivastava, S. TiwariAbstract:In this paper, we propose a new tree based Interleaver (TBI) to generate different chip-level interleaving sequences for different users in an interleave division multiple access (IDMA) system, which reduces computational complexity. This method of generation also solves the memory cost problem and reduces the amount of information exchange between mobile stations (MSs) and base stations (BSs) required to specify the Interleaver. Simulation results are presented to show that the proposed Interleavers perform well as compared to random Interleavers in an IDMA system. Copyright © 2008 John Wiley & Sons, Ltd.
-
Performance analysis of tree based Interleaver with iterative IDMA receivers using optimum power allocation algorithm
2009 First UK-India International Workshop on Cognitive Wireless Systems (UKIWCWS), 2009Co-Authors: M. Shukla, R. C. S. Chauhan, Ruchir Gupta, V. K. Srivastava, S. TiwariAbstract:This paper is concerned with the performance improvement of iterative Interleave-Division Multiple-Access (IDMA) scheme based receivers using optimum power allocation algorithm using tree based Interleavers (TBI). Based on the optimized power allocation technique, we compare the performance of IDMA receiver with random Interleaver, power Interleaver, and tree based Interleaver. The simulation results demonstrate the superior performance of tree based Interleaver in comparison to other Interleavers in view of memory requirement and computational complexity along with similar BER performance.
-
analysis and design of tree based Interleaver for multiuser receivers in idma scheme
International Conference on Networks, 2008Co-Authors: Manoj Kumar Shukla, V. K. Srivastava, S. TiwariAbstract:Here, we propose a novel tree based Interleaver (TBI) for generating user specific chip-level interleaving sequences for various users in an IDMA system, which reduces computational complexity drastically. This Interleaver also solves the memory cost problem and reduces the amount of information exchange between mobile stations and base stations required to specify the Interleaver. Simulation results are presented to show that the proposed TBI perform well as compared to master random and random Interleavers in an IDMA scheme.
Pramod Kumar Singhal - One of the best experts on this subject based on the ideXlab platform.
-
Flip Left-to-Right Approach Based Inverse Tree Interleavers for Unconventional Integrated OFDM-IDMA and SCFDMA-IDMA Systems
Wireless Personal Communications, 2019Co-Authors: Manish Yadav, Vinod Shokeen, Pramod Kumar SinghalAbstract:Several Interleavers have been proposed for conventional interleave division multiple access (CIDMA) systems which provides a mean to control burst errors and to reduce multi user and multiple access interferences. However, CIDMA alone is incapable of completely removing inter-symbol interference and inter-carrier interference problems even in presence of such Interleaver. In this paper, a recently developed novel Interleaver i.e. ‘flip left–right approach based inverse-tree Interleaver’ (FLRITI) or simply ‘inverse tree Interleaver’, has been explored for two unconventional integrated interleave division multiple access techniques i.e. single carrier frequency division multiple access cum interleave division multiple access (SCFDMA-IDMA) and orthogonal frequency division multiplexing based interleave division multiple access (OFDM-IDMA). The results and analysis reveal that this unconventional integration of CIDMA with SCFDMA and OFDM techniques in presence of FLRITI improves the overall system performance in terms of bit-error rate, memory footprint and computation complexity. Therefore, it validates the worthiness of FLRITI as a competent Interleaver for the communication systems to be used even beyond fourth generation.
-
Uncoded integrated interleave division multiple access systems in presence of power Interleavers
Radioelectronics and Communications Systems, 2017Co-Authors: Manish Yadav, Vinod Shokeen, Pramod Kumar SinghalAbstract:Interleaving is one of the most common methods known to eradicate the effects of multiple user interference. Removal of different interferences is one of the major challenges for advanced communication system designers. Several methods of interleaving have been proposed in literature and their performances have been analyzed on different communication systems to prove their worthiness in multiple user interference removal. One of such Interleavers is power Interleaver, which can be employed in communication systems as a means to control burst errors and reduce the multiple user interference. In this paper, performances of two different integrated interleave division multiple access (IIDMA) techniques i.e. SCFDM-IDMA and OFDM-IDMA have been analyzed. Novelty of this work is in the sense that the entire analysis has been performed in the presence of power Interleavers for the above two IIDMA techniques as the conventional IDMA fails to mitigate the problems of inter-carrier and inter-symbol interferences. Hence, the two techniques in presence of power Interleavers empower the idea of quality communication without any interference for future generation communication systems.
-
Modern Fisher–Yates Shuffling Based Random Interleaver Design for SCFDMA-IDMA Systems
Wireless Personal Communications, 2017Co-Authors: Manish Yadav, Prateek Raj Gautam, Vinod Shokeen, Pramod Kumar SinghalAbstract:Random Interleavers are the most preferred Interleavers utilized in digital and cellular communication systems for burst errors control. Fisher–Yates shuffling algorithm and its several modified versions offer alternate techniques of generating random permutations popularly employed in the areas of computer programming, information theory and cryptography for data security purposes. In this short paper, Modern Fisher–Yates shuffling algorithm, also known as Durstenfeld’s algorithm, has been explored to generate random Interleavers and further applied in single carrier frequency division multiple access based interleave division multiple access (SCFDMA-IDMA) systems. The results show that random Interleavers generated by applying this algorithm are suitable enough to be employed in SCFDMA-IDMA system without compromising its performance.
