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检索条件"主题词=convolutional Coding"

共 224 条记录，以下是91-100 订阅

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A (50,2,4) Nonbinary LDPC convolutional Code Decoder Chip over GF(256) in 90nm CMOS

A (50,2,4) Nonbinary LDPC Convolutional Code Decoder Chip ov...

引用

IEEE Asian Solid State Circuits Conference (A-SSCC)

作者： Lin, Chia-Lung Chen, Chih-Lung Chang, Hsie-Chia Lee, Chen-Yi Natl Chiao Tung Univ Dept Elect Engn 1001 Ta Hsueh Rd Hsinchu Taiwan Natl Chiao Tung Univ Inst Elect Hsinchu Taiwan

ISBN: (纸本)9781467327718

A memory-based (m(s) = 50, d(v) = 2, d(c) = 4) nonbinary LDPC convolutional code (NB-LDPC-CC) decoder over GF(256) with layered scheduling is presented. The proposed architecture-aware construction features fewer memory banks, low degree, low period, and better performance. To the best of our knowledge, this is the first architecture discussion and implementation for NB-LDPC-CC decoders. We optimized the architecture of message first-in-first-out (M-FIFO), check node unit, and variable node unit in terms of area and throughput. Jointly designing code and architecture, overall normalized area efficiency can be enhanced by more then six times with respect to decoders of nonbinary LDPC block codes (NB-LDPC BCs). After fabricated in 90nm CMOS, our prototype NB-LDPC-CC decoder chip can achieve maximum throughput of 22.8Mbps with frequency of 285MHz. The measured average power is 211mW at a typical operating voltage of 1.0V.

关键词： decoders operating voltage area efficiency low density parity check codes convolutional coding ARCHITECTURE Building construction Complementary Metal Oxide Semiconductor Computer chips DNA Microarrays

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An Efficient Method for Computing the Weight Spectrum of LDPC convolutional Codes Constructed from Quasi-Cyclic Codes

An Efficient Method for Computing the Weight Spectrum of LDP...

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International Symposium on Information Theory and its Applications (ISITA)

作者： Hirotomo, Masanori Morii, Masakatu Saga Univ Comp & Network Ctr Saga 8408502 Japan Kobe Univ Grad Sch Engn Kobe Hyogo 6578501 Japan

ISBN: (纸本)9784885522673

In this paper, we propose an efficient method for computing the weight spectrum of LDPC convolutional codes constructed from quasi-cyclic block codes. In the proposed method, we reduce the memory size of their parity-check matrices with the same distance profile as original codes, and apply a forward and backward tree search algorithm to the parity-check matrices of reduced memory. We show numerical results of computing the minimum free distance and the low-part weight spectrum of LDPC convolutional codes of memory about 130.

关键词： convolutional coding check matrix cyclic codes low density parity check codes Memory Memory Spectra

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Error-Trellises for Tailbiting convolutional Codes

Error-Trellises for Tailbiting Convolutional Codes

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International Symposium on Information Theory and its Applications (ISITA)

作者： Tajima, Masato Okino, Koji Toyama Univ Grad Sch Sci & Engn 3190 Gofuku Toyama 9308555 Japan Toyama Univ Informat Technol Ctr Toyama 9308555 Japan

ISBN: (纸本)9784885522673

In this paper, we present an error-trellis construction for tailbiting convolutional codes. A tailbiting error-trellis is characterized by the condition that the syndrome former starts and ends in the same state. We clarify the correspondence between code subtrellises in the tailbiting code-trellis and error subtrellises in the tailbiting error-trellis. Also, we obtain the scalar parity-check matrix for a tailbiting convolutional code. Moreover, we show the close relationship between code-trellises for an SST Viterbi decoder and error-trellises for a syndrome decoder. The proposed construction is based on the adjoint-obvious realization of a syndrome former.

关键词： convolutional coding Syndromes check matrix Viterbi decoders Correspondence

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IMPROVING ERROR PERFORMANCE IN BANDWIDTH-LIMITED BASEBAND CHANNELS

IMPROVING ERROR PERFORMANCE IN BANDWIDTH-LIMITED BASEBAND CH...

引用

作者： Juan W. Alfaro Zavala University of Gavle

学位级别：硕士

Channel coding has been largely used for the purpose of improving error performance on a communications system. Typical methods based on added redundancy allow for error detecti and correction, this improvement however comes at a cost of bandwidth. This thesis focuses on channel coding for the bandwidth-limited channel where no bandwidth expansion is allowed. We first discuss the idea of coding for the bandwidth-limited channel as seen from the signal space point of view where the purpose of coding is to maximize the Euclidian distance between constellation points without increasing the total signal power and under the condition that no extra bits can be added. We then see the problem from another angle and identify the tradeoffs related to bandwidth and error performance. This thesis intends to find a simple way of achieving an improvement in error performance for the bandwidth-limited channel without the use of lattice codes or trellis-coded modulation. The proposed system is based on convolutional coding followed by multilevel transmission. It achieved a coding gain of 2 dB on or equivalently, a coding gain of approximately 2.7 dB on without increase in bandwidth. This coding gain is better than that obtained by a more sophisticated lattice code Gosset E 8 at the same error rate.

关键词： Channel coding bandwidth-limited channel band-limited channel error performance BER lattice codes trellis-coded modulation TCM convolutional coding multilevel transmission soft decisions hard decisions MPAM

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A QPSK/16-QAM OFDM-based 29.1Mbps LINC transmitter for Body Channel Communication

A QPSK/16-QAM OFDM-based 29.1Mbps LINC transmitter for Body ...

引用

IEEE Asian Conference on Solid-State Circuits (ASSCC)

作者： Ping-Yuan Tsai Shu-Yu Hsu Jen-Shin Chang Tsan-Wen Chen Chen-Yi Lee Department of Electronics Engineering and Institute of Electronics National Chiao-Tung University Hsinchu Taiwan

ISBN: (纸本)9781467327701

This paper proposed a high speed Body Channel Communication (BCC) transmitter under IF 20MHz, adopting the OFDM modulation and uneven multi-level LINC technique to reduce the power and complexity of the front-end circuit. The OFDM uses 16-QAM modulation to enhance the data rate and could select to use a convolutional code to increase the coding gain. The phase modulator in the LInear amplification with Nonlinear Component (LINC) transmitter uses not only clockgating scheme but also the glitch free protection. A detection and calibration DSP are also integrated to solve the LINC branch mismatch problem. Finally the capacitive sensing circuit provides the information of the connectivity between pastes and human. The chip is implemented by 90nm CMOS process, with die area 1.3mm 2 . The maximum data rate could achieve 29.1Mbps. The total power is 1.925mW, resulting in 0.07nJ/bit transmission energy and 2.92 bps/Hz spectral efficiency.

关键词： connectivity between pastes Pastes connectivity Between Orthogonal frequency division multiplexing Transmitter Transmitters Quadrature amplitude modulation convolutional coding phase modulator Data transfer rates Communication Research

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Design of a Robust Underwater Acoustic Communication System over Multipath Fading Channels

Design of a Robust Underwater Acoustic Communication System ...

引用

第三届国际海洋声学会议

作者： Jangeun Kim Taebo Shim School of Electronic Engineering Soongsil University Seoul156-743 Korea

ISBN: (纸本)9780735411074

Due to the surface and bottom constraints of the underwater acoustic channel (UAC) in shallow waters, multipath fading occurs and causes degradation of the signal for the UAC system. To overcome these problems, a robust underwater acoustic communication system was designed over multipath fading channels by employing both decision feedback equalization with the RLS algorithm and convolutional coding with interleaving+shuffling block data sequence. The dual use of these two methods simultaneously can reduce the intersymbol interference (ISI) and the adjacent bit and burst errors. The system will retransmit the same signal if the system fails to estimate the channel due to severe multipath fading. To verify the performance of the system, the transmission of an image was tested using a 524,288bit gray-scaled image through the multipath fading channel. The test results showed that the number of bit errors was reduced from 86,824 to 5,106 when the reference SNR was 12 dB.

关键词： Multipath fading multi-path fading channel underwater acoustic communication Bit error rate COMMUNICATION SYSTEMS convolutional coding UAC Clinical Test Result decision feedback images Imagery (Psychotherapy) Dual System performance

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A (50,2,4) nonbinary LDPC convolutional code decoder chip over GF(256) in 90nm CMOS

A (50,2,4) nonbinary LDPC convolutional code decoder chip ov...

引用

IEEE Asian Conference on Solid-State Circuits (ASSCC)

作者： Chia-Lung Lin Chih-Lung Chen Hsie-Chia Chang Chen-Yi Lee Department of Electronics Engineering & Institute of Electronics National Chiao Tung University Hsinchu Taiwan

ISBN: (纸本)9781467327701

A memory-based (m s = 50,d v = 2,d c = 4) nonbinary LDPC convolutional code (NB-LDPC-CC) decoder over GF(256) with layered scheduling is presented. The proposed architecture-aware construction features fewer memory banks, low degree, low period, and better performance. To the best of our knowledge, this is the first architecture discussion and implementation for NB-LDPC-CC decoders. We optimized the architecture of message first-in-first-out (M-FIFO), check node unit, and variable node unit in terms of area and throughput. Jointly designing code and architecture, overall normalized area efficiency can be enhanced by more then six times with respect to decoders of nonbinary LDPC block codes (NB-LDPC BCs). After fabricated in 90nm CMOS, our prototype NB-LDPC-CC decoder chip can achieve maximum throughput of 22.8Mbps with frequency of 285MHz. The measured average power is 211mW at a typical operating voltage of 1.0V.

关键词： features fewer memory decoders Memory low density parity check codes convolutional coding area efficiency operating voltage ARCHITECTURE Building construction Complementary Metal Oxide Semiconductor Computer chips DNA Microarrays

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Low Latency Relaying Schemes for Next-Generation Cellular Networks

Low Latency Relaying Schemes for Next-Generation Cellular Ne...

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IEEE International Conference on Communications

作者： Glenn J. Bradford J. Nicholas Laneman Department of Electrical Engineering University of Notre Dame

ISBN: (纸本)9781457720529

The reduction in both user and control plane latency is a major goal for next generation (4G) cellular networks, specifically the Long Term Evolution-Advanced (LTE-A) standard. At the same time, relay stations, which introduce additional latency into transmissions, are seen as a potential means to improve cell spectral efficiency and coverage. This paper extends a number of existing relaying schemes to the case where a stricter latency constraint is applied. These low latency schemes are first evaluated for convolutional codes, for which they quickly approach the performance of full decoding at the relay with little additional latency over memoryless relaying. The schemes are then adapted for the turbo code in the LTE standard and shown to be preferable to full decoding and memoryless relaying for certain LTE-A relay types.

关键词： Latency relaying Scheme Cellular networks turbo codes relay convolutional coding

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Anytime Reliability of Systematic LDPC convolutional Codes

Anytime Reliability of Systematic LDPC Convolutional Codes

引用

IEEE International Conference on Communications

作者： Leefke Dossel Lars K. Rasmussen Ragnar Thobaben Mikael Skoglund School of Electrical Engineering and the ACCESS Linnaeus Center KTH Royal Institute of Technology

ISBN: (纸本)9781457720529

We propose a LDPC convolutional Code ensemble together with an expanding-window message-passing decoder that asymptotically have anytime properties when used for streaming transmission on the binary erasure channel. We show analytically that the decoding erasure probability of these codes decays exponentially over decoding delay and determine the corresponding anytime exponents.

关键词： convolutional coding low density parity check codes asymptotic DEcoding erasure channel message passing

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Space-Time coding Scheme for Time-Frequency Asynchronous Two-Way Relay Networks

Space-Time Coding Scheme for Time-Frequency Asynchronous Two...

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54th Annual IEEE Global Telecommunications Conference (GLOBECOM)

作者： Zhang, Weile Gao, Feifei Chen, Hongyang Yin, Qinye Xi An Jiao Tong Univ MOE Key Lab Intelligent Networks & Network Secur Xian 710049 Peoples R China Tsinghua Univ Dept Automat Beijing 100084 Peoples R China Univ Tokyo Inst Ind Sci Tokyo Japan Xidian Univ The State Key Lab Integrated Serv Network Xian Peoples R China

ISBN: (纸本)9781424492688

In this paper, we develop a distributed space-time coding scheme to cope with both time and frequency asynchronism in two-way relay network (TWRN). The convolutional coding is employed to handle multiple timing errors in the networks. We prove that both the cooperative and the multipath diversities can be achieved by linear receivers, e. g., linear zero-forcing (ZF) or minimum mean square error (MMSE) receivers. Moreover, the diversity can be guaranteed almost surely under frequency asynchronism. Numerical results are then provided to corroborate the proposed studies.

关键词： Delay MMSE receivers OFDM Peer to peer computing Receivers Relays Time frequency analysis Vectors convolutional codes convolutional coding cooperative communication cooperative diversities distributed space-time coding scheme diversity reception frequency asynchronism least mean squares methods linear receivers linear zero-forcing minimum mean square error multipath diversities multiple timing errors radio networks radio receivers space-time codes time asynchronism two-way relay networks

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