• Title/Summary/Keyword: layered decoding

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A Study on layered Space Time Trellis codes for MIMO system based on Iterative Decoding Algorithm (MIMO 시스템에서 반복 복호 알고리즘 기반의 계층적 시공간 부호화 방식 연구)

  • Park, Tae-Doo;Jung, Ji-Won
    • Journal of Navigation and Port Research
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    • v.36 no.10
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    • pp.845-849
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    • 2012
  • The next-generation wireless communication requires fast transmission speeds with various services and high reliability. In order to satisfy these needs we study MIMO system used layered space time coded system (LST) combining space time trellis codes (STTC) with turbo codes. In LST, two codes that are inner and outer codes are concatenated in the serial fashion. The inner codes are turbo Pi codes suggested in DVB-RCS NG system, and outer codes are STTC codes proposed by Blum. The interleaver technique is used to efficiently combine two codes. And we proposed and simulated that a full iteration method between turbo decoder and BCJR decoder to improve the performance instead of only processing inner-iteration turbo decoder. The simulation results of proposed effective layered method show improving BER performance about 1.3~1.5dB than conventional one.

Design of SVC-based Multicasting System Preserving Scalable Security

  • Seo, Kwang-Deok
    • Journal of information and communication convergence engineering
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    • v.8 no.1
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    • pp.71-76
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    • 2010
  • Scalable video coding (SVC) has been standardized as an extension of the H.264/AVC standard. SVC allows straightforward adaptation of video streams by providing layered bit streams. In this paper, we propose a SVC video-based multicasting system preserving scalable security which is able to provide a SVC video service while maintaining information security. In order to maintain information security between a server and a client during all transmission time, the proposed system immediately performs a packet filtering process without decoding with respect to encrypted data received in a routing device, thereby reducing an amount of calculations and latency.

Joint BLAST-STTC for MIMO-OFDM System

  • Niyizamwiyitira, Christine;Kang, Chul-Gyu;Oh, Chang-Heon
    • Journal of information and communication convergence engineering
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    • v.8 no.4
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    • pp.387-392
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    • 2010
  • This study focuses on improving MIMO-OFDM systems by combining a wireless communication architecture known as vertical BLAST(bell laboratories layered space-time) or V-BLAST and STTC(space time trellis coding). In this paper, the combination is done by introducing STTC in each V-BLAST layer. Moreover, this architecture uses multiple antennas that are grouped into small number of antennas which makes it less complex to decode by decoding every group. Whereas, in traditional V-BLAST, all the antennas form one group and they are decoded together at the receiver, therefore, this increases the complexity as the number of antennas is getting high. We compare the bit error rate performance of this system with MIMO-OFDM that uses convolutional coding instead of STTC. Under the same spectral efficiency, the simulation results prove that joining V-BLAST with STTC improves MIMO-OFDM systems performance.

Low-Complexity Maximum-Likelihood Decoder for V-BLAST Architecture

  • Le, Minh-Tuan;Pham, Van-Su;Mai, Linh;Yoon, Gi-Wan
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • v.9 no.1
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    • pp.126-130
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    • 2005
  • In this paper, a low-complexity maximum-likelihood (ML) decoder based on QR decomposition, called real-valued LCMLDec decoder or RVLCMLDec for short, is proposed for the Vertical Bell Labs Layered Space-Time (V-BLAST) architecture, a promising candidate for providing high data rates in future fixed wireless communication systems [1]. Computer simulations, in comparison with other detection techniques, show that the proposed decoder is capable of providingthe V-BLAST schemes with ML performance at low detection complexity.

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Simplified Maximum-Likelihood Decoder for V-BLAST Architecture

  • Le Minh-Tuan;Pham Van-Su;Mai Linh;Yoon Giwan
    • Journal of information and communication convergence engineering
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    • v.3 no.2
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    • pp.76-79
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    • 2005
  • In this paper, a low-complexity maximum-likelihood (ML) decoder based on QR decomposition, called real-valued LCMLDec decoder or RVLCMLDec for short, is proposed for the Vertical Bell Labs Layered Space-Time (V-BLAST) architecture, a promising candidate for providing high data rates in future fixed wireless communication systems [1]. Computer simulations, in comparison with other detection techniques, show that the proposed decoder is capable of providing the V­BLAST schemes with ML performance at low detection complexity

New Core-Layer Decoding Method Using Receive SNR in ATSC 3.0 LDM-MIMO Broadcasting Systems (ATSC 3.0 LDM-MIMO 방송 시스템에서 수신 SNR을 이용한 새로운 Core-Layer 복호 기법)

  • Kim, Seung-Hyeon;Jung, Tae-Jin
    • Proceedings of the Korean Society of Broadcast Engineers Conference
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    • 2022.06a
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    • pp.164-166
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    • 2022
  • 본 논문에서는 ATSC 3.0 Layered-Division-Multiplexing(LDM) Multiple-Inputs-Multiple-Outputs(MIMO) 방송 시스템에서 Core-Layer 신호에 대한 새로운 Hybrid PGA(HPGA) 복호 기법을 제안하고자 한다. 제안된 기법은 각 수신단의 Enhanced-Layer 신호의 평균전력 대비 잡음 값에 따라 기존의 GA 기법과 PGA 기법을 선택적으로 적용하여 기존의 PGA 기법에 비해 큰 성능저하 없이 복호 복잡도는 약 25% 줄일 수 있다.

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New Low-Complexity Core-Layer Decoding Method in ATSC3.0 LDM-MIMO broadcasting system (ATSC3.0 LDM-MIMO 방송 시스템에서 새로운 저복잡도 CL 복조 기법)

  • Lee, Chang-Jun;Kim, Seung-Hyeon;Jung, Tae-Jin
    • Proceedings of the Korean Society of Broadcast Engineers Conference
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    • 2020.07a
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    • pp.62-65
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    • 2020
  • 본 논문에서는 ATSC3.0 Layered-Division-Multiplexing Multiple-Inputs-Multiple-Outputs 방송 시스템에서 Core-Layer(CL) 신호 복조 시 기존 Gaussian-Approximation(GA) 기법과 Partial-GA(PGA) 기법을 선택적으로 사용하여 PGA 기법과 성능은 거의 동일하며 복잡도는 더 작은 새로운 Hybrid PGA(HPGA) 복조 기법을 제안하고자 한다. 제안된 복조 기법은 수신단 신호의 Injection Level(IL) 값이 송신 IL보다 높아 CL 신호 입장에서 채널 상태가 좋을 경우 GA 기법을 사용하고, 반대로 수신단 IL 값이 송신 IL보다 낮아 채널 상태나 좋지 않을 경우 성능을 우선한 PGA 기법을 사용하게 된다. 실험 결과 성능은 PGA 기법과 거의 동일하고 복잡도는 PGA 기법의 복잡도 대비 약 25% 정도 작아짐을 보인다.

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The Combined AMC-MIMO System with Optimal Turbo Coded V-BLAST Technique to Improve Throughput and SNR (전송률 향상 및 SNR 개선을 위한 최적의 터보 부호화된 V-BLAST 기법을 적용한 AMC-MIMO 결합시스템)

  • Ryoo, Sang-Jin;Lee, Kyung-Hwan;Choi, Kwang-Wook;Lee, Keun-Hong;Hwang, In-Tae;Kim, Cheol-Sung
    • Journal of Internet Computing and Services
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    • v.8 no.4
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    • pp.61-70
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    • 2007
  • In this paper, we propose and observe the Adaptive Modulation system with optimal Turbo Coded V-BLAST(Vertical-Bell-lab Layered Space-Time) technique that is applied the extrinsic information from MAP Decoder in decoding Algorithm of V-BLAST: ordering and slicing. And comparing the proposed system with the Adaptive Modulation system using conventional Turbo Coded V-BLAST technique that is simply combined V-BLAST with Turbo Coding scheme, we observe how much throughput performance and SNR has been improved. In addition, we show that the proposed system using STD(Selection Transmit Diversity) scheme results in on improved result, By using simulation and comparing to conventional Turbo Coded V-BLAST technique with the Adaptive Modulation systems, the optimal Turbo Coded V-BLAST technique with the Adaptive Modulation systems has SNR gain over all SNR range and better throughput gain that is about 350Kbps in 11dB SNR range. Also, comparing with the conventional Turbo Coded V-BLAST technique using 2 transmit and 2 receive antennas, the proposed system with STD scheme show that the improvement of maximum throughput is about 1.77Mbps in the same SNR range and the SNR gain is about 5.88dB to satisfy 4Mbps throughput performance.

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A Review on Info-Convergence Nanohybrid System (정보 융합 나노하이브리드 시스템의 이해)

  • Jin, Wenji;Park, Dae-Hwan
    • Korean Chemical Engineering Research
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    • v.57 no.3
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    • pp.321-330
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    • 2019
  • With the rapid development trend in multidisciplinary science and convergence technology, digital data storages have been necessary in order to accumulate a huge amount of information with high security. The possibility that biological DNA code system can offer encoding and decoding information has been illustrated by many researchers. In this review, we summarized current issue of info-convergence nanohybrid system, so-called infohybrid. DNA-inorganic nanohybrid materials and devices to achieve DNA-based molecular information system are presented. The possible applications focusing on tracking-and-traceability management, authenticity verification, and nano-forensics are also reviewed with four steps of encoding, encrypting, decrypting and decoding. We also highlighted the potential of smart code system with Nano-Bio-Info-Cogno (NBIC) convergence technology through the recently published case study of Avatar DNA nanohybrid system with smart phone.

A Design of LDPC Decoder for IEEE 802.11n Wireless LAN (IEEE 802.11n 무선 랜 표준용 LDPC 복호기 설계)

  • Jung, Sang-Hyeok;Shin, Kyung-Wook
    • Journal of the Institute of Electronics Engineers of Korea SD
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    • v.47 no.5
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    • pp.31-40
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    • 2010
  • This paper describes a LDPC decoder for IEEE 802.11n wireless LAN standard. The designed processor supports parity check matrix for block length of 1,944 and code rate of 1/2 in IEEE 802.11n standard. To reduce hardware complexity, the min-sum algorithm and layered decoding architecture are adopted. A novel memory reduction technique suitable for min-sum algorithm was devised, and our design reduces memory size to 25% of conventional method. The LDPC decoder processor synthesized with a $0.35-{\mu}m$ CMOS cell library has 200,400 gates and memory of 19,400 bits, and the estimated throughput is about 135 Mbps at 80 MHz@2.5v. The designed processor is verified by FPGA implementation and BER evaluation to validate the usefulness as a LDPC decoder.