• Title/Summary/Keyword: Viterbi decode

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Parallel Structure of Viterbi Decoder for High Performance of PRML Signal (PRML신호용 고성능 Viterbi Decoder의 병렬구조)

  • Seo, Beom-Soo;Kim, Jong-Man;Kim, Hyong-Suk
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.58 no.4
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    • pp.623-626
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    • 2009
  • In this paper, we applied new analog viterbi decoder to decode PR(1,2,2,1) signal for DVD and analyze the specific and signal characteristics. We implemented the parallel analog viterbi decoder and the convolution digital viterbi decoder(the digital PRML) utilizing the technology of analog parallel processing circuits. The proposed analog viterbi decoder can replace the conventional digital viterbi decoder by a new one. Our circuits design the low distortion and the high accuracy over the previous implementation. Through the parallel structure of the proposed viterbi decoder, we got the achievement of the decoding speed by the multiple times.

A Two-Stage Radix-4 Viterbi Decoder for Multiband OFDM UWB Systems

  • Choi, Sung-Woo;Kang, Kyu-Min;Choi, Sang-Sung
    • ETRI Journal
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    • v.30 no.6
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    • pp.850-852
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    • 2008
  • This letter presents a power efficient 64-state Viterbi decoder (VD) employing a two-stage radix-4 add-compare-select architecture. A class of VD architectures is implemented, and their hardware complexity, maximum operating speed, and power consumption are compared. Implementation results show that the proposed VD architecture is suitable for multiband orthogonal frequency-division multiplexing (MB-OFDM) ultra-wideband (UWB) systems, which can support the data rate of 480 Mbps even when implemented using 0.18-${\mu}m$ CMOS technology.

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Implementation of viterbi Decoder for IMT2000 Mobile Station in FPGA form (IMT2000 단말기용 Viterbi Decoder의 FPGA 구현)

  • 김진일;정완용;김동현;정건필;조춘식
    • Proceedings of the IEEK Conference
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    • 1999.06a
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    • pp.825-828
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    • 1999
  • A Viterbi Decoder for IMT2000 Mobile Station based on cdma200 is implemented in this paper. There are fundamental traffic channel, supplemental traffic channel for user data transmission and dedicated control channel for signal transmission in cdma2000. This decoder can decode these channels simultaneously, and support l/2, l/3, 1/4 code rate decoding. In case of fundamental channel decoding, it needs about 1100 logic cells and 30000 bit memory block.

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A Half-Rate Space-Frequency Coded OFDM with Dual Viterbi Decoder (이중 Viterbi 복호기를 가지는 반율 공간-주파수 부호화된 직교 주파수분할다중화)

  • Kang Seog-Geun
    • The KIPS Transactions:PartC
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    • v.13C no.1 s.104
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    • pp.75-82
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    • 2006
  • In this paper, a space-frequency coded orthogonal frequency division multiplexing (SFC-OFDM) scheme with dual Viterbi decoder is proposed and analyzed. Here, two independent half-rate OFDM symbols are generated after convolutional coding of the binary source code. A dual Viterbi decoder is exploited to decode the demodulated sequences independently in the receiver, and their path metrics are compared. Accordingly, the recovered binary data in the proposed scheme are composed of the combination of the sequences having larger path metrics while those in a conventional system are simply the output of single Viterbi decoder. As a result, the proposed SFC-OFDM scheme has a better performance than the conventional one for all signal-to-noise power ratio.

Parallel Decoder Module for Digital-Information Translation of Optical Disc (광디스크 디지털 정보 전송을 위한 병렬구조 디코더 모듈)

  • Kim, Jong-Man;Kim, Yeong-Min;Shin, Dong-Yong;Seo, Bum-Su
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2010.06a
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    • pp.289-289
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    • 2010
  • Translation Characteristics of Digital Decoder utilizing the analog parallel processing circuit technology is designed. The fast parallel viterbi decoder system acted by a replacement of the conventional digital viterbi Decoder has good propagation. we are applied proposed analog viterbi decoder to decode PR signal for DVD and analyze the specific circuit and signal characteristics.

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Forward Viterbi Decoder applied LVQ Network (LVQ Network를 적용한 순방향 비터비 복호기)

  • Park Ji woong
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.29 no.12A
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    • pp.1333-1339
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    • 2004
  • In IS-95 and IMT-2000 systems using variable code rates and constraint lengths, this paper limits code rate 1/2 and constraint length 3 and states the effective reduction of PM(Path Metric) and BM(Branch Metric) memories and arithmetic comparative calculations with appling PVSL(Prototype Vector Selecting Logic) and LVQ(Learning Vector Quantization) in neural network to simplify systems and to decode forwardly. Regardless of extension of constraint length, this paper presents the new Vierbi decoder and the appied algorithm because new structure and algorithm can apply to the existing Viterbi decoder using only uncomplicated application and verifies the rationality of the proposed Viterbi decoder through VHDL simulation and compares the performance between the proposed Viterbi decoder and the existing.

An Adaptive Viterbi Decoder Architecture Using Reduced State Transition Paths (감소된 상태천이 경로를 이용한 적응 비터비 복호기의 구조)

  • Ko, Hyoungmin;Cho, Won-Kyung;Kim, Jinsang
    • Journal of Advanced Navigation Technology
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    • v.8 no.2
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    • pp.190-196
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    • 2004
  • The development of a new hardware structure which can implement the viterbi algorithm efficiently is required for applications such as a software radio because the viterbi algorithm, which is an error correction code function for the second and the third generation of mobile communication, needs a lot of arithmetic operations. The length of K in the viterbi algorithm different from each standard, for examples, K=7 in case of IS-95 standard and GSM standard, and K=9 in case of WCDMA and CDMA2000. In this paper, we propose a new hardware structure of an adaptive viterbi decoder which can decode the constraint length in K=3~9 and the data rate in 1/2 ~ 1/3. Prototyping results targeted to Altera Cyclon EPIC20F400C8, shows that the proposed hardware structure needs maximum 19,276 logic elements and power dissipation of 222.6 mW.

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Multiple Symbol Detection of Trellis coded Differential space-time modulation for OFDM (OFDM에서 트렐리스 부호화된 차동 시공간 변조의 다중 심벌 검파)

  • 유항열;한상필;김진용;김성열;김종일
    • Journal of the Institute of Convergence Signal Processing
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    • v.5 no.3
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    • pp.223-229
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    • 2004
  • Recently, OFDM and STC techniques have been considered to be candidate to support multimedia services in the next generation mobile radio communications and have been developed the many communications systems in order to achieve the high data rates. In this paper, we propose the Trellis-Coded Differential Space Time Modulation-OFDM system with multiple symbol detection. The Trellis-code performs the set partition with unitary group codes. The Viterbi decoder containing new branch metrics is introduced in order to improve the bit error rate (BER) in the differential detection of the unitary differential space time modulation. Also, we describe the Viterbi algorithm in order to use this branch metrics. Our study shows that such a Viterbl decoder improves BER performance without sacrificing bandwidth and power efficiency.

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A Design of Parameterized Viterbi Decoder using Hardware Sharing (하드웨어 공유를 이용한 파라미터화된 비터비 복호기 설계)

  • Park, Sang-Deok;Jeon, Heung-Woo;Shin, Kyung-Wook
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2008.05a
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    • pp.93-96
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    • 2008
  • This paper describes an efficient design of a multi-standard Viterbi decoder that supports multiple constraint lengths and code rates. The Viterbi decode. is parameterized for the code rates 1/2, 1/3 and constraint lengths 7, 9, thus it has four operation modes. In order to achieve low hardware complexity and low power, an efficient architecture based on hardware sharing techniques is devised. Also, the optimization of ACCS (Accumulate-Subtract) circuit for the one-point trace-back algorithm reduces its area by about 35% compared to the full parallel ACCS circuit. The parameterized Viterbi decoder core has 79,818 gates and 25,600 bits memory, and the estimated throughput is about 105 Mbps at 70 MHz clock frequency.

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A Study of Efficient Viterbi Equalizer in FTN Channel (FTN 채널에서의 효율적인 비터비 등화기 연구)

  • Kim, Tae-Hun;Lee, In-Ki;Jung, Ji-Won
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.18 no.6
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    • pp.1323-1329
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    • 2014
  • In this paper, we analyzed efficient decoding scheme with FTN (Faster than Nyquist) method that is transmission method faster than Nyquist theory and increase the throughput. we proposed viterbi equalizer model to minimize ISI (Inter-Symbol Interference) when FTN signal is transmitted. the proposed model utilized interference as branch information. In this paper, to decode FTN singal, we used turbo equalization algorithms that iteratively exchange probabilistic information between soft Viterbi equalizer (BCJR method) and LDPC decoder. By changing the trellis diagram in order to maximize Euclidean distance, we confirmed that performance was improved compared to conventional methods as increasing throughput of FTN signal.