Resource Efficient LDPC Decoders - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Resource Efficient LDPC Decoders write by Vikram Arkalgud Chandrasetty. This book was released on 2017-12-05. Resource Efficient LDPC Decoders available in PDF, EPUB and Kindle. This book takes a practical hands-on approach to developing low complexity algorithms and transforming them into working hardware. It follows a complete design approach – from algorithms to hardware architectures - and addresses some of the challenges associated with their design, providing insight into implementing innovative architectures based on low complexity algorithms.The reader will learn: Modern techniques to design, model and analyze low complexity LDPC algorithms as well as their hardware implementation How to reduce computational complexity and power consumption using computer aided design techniques All aspects of the design spectrum from algorithms to hardware implementation and performance trade-offs Provides extensive treatment of LDPC decoding algorithms and hardware implementations Gives a systematic guidance, giving a basic understanding of LDPC codes and decoding algorithms and providing practical skills in implementing efficient LDPC decoders in hardware Companion website containing C-Programs and MATLAB models for simulating the algorithms, and Verilog HDL codes for hardware modeling and synthesis
Energy-efficient Decoding of Low-density Parity-check Codes
Energy-efficient Decoding of Low-density Parity-check Codes - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Energy-efficient Decoding of Low-density Parity-check Codes write by Kevin Cushon. This book was released on 2014. Energy-efficient Decoding of Low-density Parity-check Codes available in PDF, EPUB and Kindle. "Low-density parity-check (LDPC) codes are a type of error correcting code that are frequently used in high-performance communications systems, due to their ability to approach the theoretical limits of error correction. However, their iterative soft-decision decoding algorithms suffer from high computational complexity, energy consumption, and auxiliary circuit implementation difficulties. It is of particular interest to develop energy-efficient LDPC decoders in order to decrease cost of operation, increase battery life in portable devices, lessen environmental impact, and increase the range of applications for these powerful codes.In this dissertation, we propose four new LDPC decoder designs with the primary goal of improving energy efficiency over previous designs. First, we present a bidirectional interleaver based on transmission gates, which reduces wiring complexity and associated parasitic energy losses. Second, we present an iterative decoder design based on pulse-width modulated min-sum (PWM-MS). We demonstrate that the pulse width message format reduces switching activity, computational complexity, and energy consumption compared to other recent LDPC decoder designs. Third, wepresent decoders based on differential binary (DB) algorithms. We also propose an improved differential binary (IDB) decoding algorithm, which greatly increases throughput and reduces energy consumption compared to recent decoders ofsimilar error correction capability. Finally, we present decoders based on gear-shift algorithms, which use multiple decoding rules to minimize energy consumption. We propose gear-shift pulse-width (GSP) and IDB with GSP (IGSP) algorithms, and demonstrate that they achieve superior energy efficiency without compromising error correction performance." --
Algorithms and Architectures for Efficient Low Density Parity Check (LDPC) Decoder Hardware
Algorithms and Architectures for Efficient Low Density Parity Check (LDPC) Decoder Hardware - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Algorithms and Architectures for Efficient Low Density Parity Check (LDPC) Decoder Hardware write by Tinoosh Mohsenin. This book was released on 2010. Algorithms and Architectures for Efficient Low Density Parity Check (LDPC) Decoder Hardware available in PDF, EPUB and Kindle. Many emerging and future communication applications require a significant amount of high throughput data processing and operate with decreasing power budgets. This need for greater energy efficiency and improved performance of electronic devices demands a joint optimization of algorithms, architectures, and implementations. Low Density Parity Check (LDPC) decoding has received significant attention due to its superior error correction performance, and has been adopted by recent communication standards such as 10GBASE-T 10 Gigabit Ethernet. Currently high performance LDPC decoders are designed to be dedicated blocks within a System-on-Chip (SoC) and require many processing nodes. These nodes require a large set of interconnect circuitry whose delay and power are wire-dominated circuits. Therefore, low clock rates and increased area are a common result of the codes' inherent irregular and global communication patterns. As the delay and energy costs caused by wires are likely to increase in future fabrication technologies new solutions dealing with future VLSI challenges must be considered. Three novel message-passing decoding algorithms, Split-Row, Multi-Splitand Split-Row Threshold are introduced, which significantly reduce processor logical complexity and local and global interconnections. One conventional and four Split-Row Threshold LDPC decoders compatible with the 10GBASE-T standard are implemented in 65 nm CMOS and presented along with their trade-offs in error correction performance, wire interconnect complexity, decoder area, power dissipation, and speed. For additional power saving, an adaptive wordwidth decoding algorithm is proposed which switches between a 6-bit Normal Mode and a reduced 3-bit Low Power Mode depending on the SNR and decoding iteration. A 16-way Split-Row Threshold with adaptive wordwidth implementation achieves improvements in area, throughput and energy efficiency of 3.9x, 2.6x, and 3.6x respectively, compared to a MinSum Normalized implementation, with an SNR loss of 0.25 dB at BER = 10−7. The decoder occupies a die area of 5.10 mm2, operates up to 185 MHz at 1.3 V, and attains an average throughput of 85.7 Gbps with early-termination. Low power operation at 0.6 V gives a worst case throughput of 9.3 Gbps--above the 6.4 Gbps 10GBASE-T requirement, and an average power of 31 mW.
VLSI Architectures for Multi-Gbps Low-Density Parity-Check Decoders
VLSI Architectures for Multi-Gbps Low-Density Parity-Check Decoders - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook VLSI Architectures for Multi-Gbps Low-Density Parity-Check Decoders write by Ahmad Darabiha. This book was released on 2008. VLSI Architectures for Multi-Gbps Low-Density Parity-Check Decoders available in PDF, EPUB and Kindle. Near-capacity performance and parallelizable decoding algorithms have made Low-Density Parity Check (LDPC) codes a powerful competitor to previous generations of codes, such as Turbo and Reed Solomon codes, for reliable high-speed digital communications. As a result, they have been adopted in several emerging standards. This thesis investigates VLSI architectures for multi-Gbps power and area-efficient LDPC decoders. To reduce the node-to-node communication complexity, a decoding scheme is proposed in which messages are transferred and computed bit-serially. Also, a broadcasting scheme is proposed in which the traditional computations required in the sum-product and min-sum decoding algorithms are repartitioned between the check and variable node units. To increase decoding throughput, a block interlacing scheme is investigated which is particularly advantageous in fully-parallel LDPC decoders. To increase decoder energy efficiency, an efficient early termination scheme is proposed. In addition, an analysis is given of how increased hardware parallelism coupled with a reduced supply voltage is a particularly effective approach to reduce the power consumption of LDPC decoders. These architectures and circuits are demonstrated in two hardware implementations. Specifically, a 610-Mbps bit-serial fully-parallel (480, 355) LDPC decoder on a single Altera Stratix EP1S80 device is presented. To our knowledge, this is the fastest FPGA-based LDPC decoder reported in the literature. A fabricated 0.13-mum CMOS bit-serial (660, 484) LDPC decoder is also presented. The decoder has a 300 MHz maximum clock frequency and a 3.3 Gbps throughput with a nominal 1.2-V supply and performs within 3 dB of the Shannon limit at a BER of 10-5. With more than 60% power saving gained by early termination, the decoder consumes 10.4 pJ/bit/iteration at Eb=N0=4dB. Coupling early termination with supply voltage scaling results in an even lower energy consumption of 2.7 pJ/bit/iteration with 648 Mbps decoding throughput. The proposed techniques demonstrate that the bit-serial fully-parallel architecture is preferred to memory-based partially-parallel architectures, both in terms of throughput and energy efficiency, for applications such as 10GBase-T which use medium-size LDPC code (e.g., 2048 bit) and require multi-Gbps decoding throughput.
Advances in VLSI and Embedded Systems
Advances in VLSI and Embedded Systems - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Advances in VLSI and Embedded Systems write by Zuber Patel. This book was released on 2020-08-28. Advances in VLSI and Embedded Systems available in PDF, EPUB and Kindle. This book presents select peer-reviewed proceedings of the International Conference on Advances in VLSI and Embedded Systems (AVES 2019) held at SVNIT, Surat, Gujarat, India. The book covers cutting-edge original research in VLSI design, devices and emerging technologies, embedded systems, and CAD for VLSI. With an aim to address the demand for complex and high-functionality systems as well as portable consumer electronics, the contents focus on basic concepts of circuit and systems design, fabrication, testing, and standardization. This book can be useful for students, researchers as well as industry professionals interested in emerging trends in VLSI and embedded systems.
