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FPGA Implementations of LDPC over GF(2m) Decoders 基于GF(2m)解码器的LDPC的FPGA实现
Pub Date : 2007-11-21 DOI: 10.1109/SIPS.2007.4387557
C. Spagnol, W. Marnane, E. Popovici
Low Density Parity Check (LDPC) codes over GF(2m) are an extension of binary LDPC codes that have not been studied extensively. Performances of GF(2m) LDPC codes have been shown to be higher than binary LDPC codes, but the complexity of the encoders/decoders increases. Hence there iS a substantial lack of hardware implementations for LDPC over GF(2m) codes. This paper presents a FPGA serial implementation of two decoding algorithms for LDPC over GF(2m). The results prove that the implementation of LDPC over GF(2m) decoding is feasible and the extra complexity of the decoder is balanced by the superior performance of GF(2m) LDPC codes.
GF(2m)上的低密度奇偶校验码(LDPC)是二进制LDPC码的一种扩展,目前还没有得到广泛的研究。GF(2m) LDPC码的性能已被证明高于二进制LDPC码,但编解码器的复杂性增加了。因此,在GF(2m)代码上,LDPC的硬件实现非常缺乏。本文提出了一种FPGA串行实现两种基于GF(2m)的LDPC解码算法。结果证明了LDPC码在GF(2m)译码上的实现是可行的,并且GF(2m) LDPC码的优越性能抵消了解码器的额外复杂度。
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引用次数: 35
Implementation of Low-Complexity Principal Component Analysis for Remotely Sensed Hyperspectral-Image Compression 低复杂度主成分分析在遥感高光谱图像压缩中的实现
Pub Date : 2007-11-21 DOI: 10.1109/SIPS.2007.4387563
Q. Du, Wei Zhu, J. Fowler
Remotely sensed hyperspectral imagery has vast data volume, for which data compression is a necessary processing step. Spectral decorrelation is critical to successful hyperspectral-image compression. Principal component analysis (PCA) is well-known for its superior performance in data decorrelation, and it has been demonstrated that using PCA for spectral decorrelation can yield rate-distortion and data-analysis performance superior to other widely used approaches, such as the discrete wavelet transform (DWT). However, PCA is a data-dependent transform, and its complicated implementation in hardware hinders its use in practice. In this paper, schemes for low-complexity PCA are discussed, including spatial down-sampling, the use of non-zero mean data, and the adoption of a simple PCA neural-network. System-design issues are also investigated. Experimental results focused on the fidelity of pixel values and pixel spectral signatures demonstrate that the proposed schemes achieve a trade-off between compression performance and system-design complexity.
遥感高光谱图像数据量巨大,数据压缩是处理高光谱图像的必要步骤。光谱去相关是高光谱图像成功压缩的关键。主成分分析(PCA)以其优越的数据去相关性能而闻名,并且已经证明,使用PCA进行频谱去相关可以产生率失真和数据分析性能优于其他广泛使用的方法,如离散小波变换(DWT)。然而,PCA是一种依赖于数据的变换,其复杂的硬件实现阻碍了其在实践中的应用。本文讨论了低复杂度主成分分析的方案,包括空间降采样、使用非零均值数据和采用简单的主成分分析神经网络。系统设计问题也进行了调查。对像素值和像素光谱特征保真度的实验结果表明,所提出的方案在压缩性能和系统设计复杂性之间取得了平衡。
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引用次数: 10
Reconfigurable FPGA Implementation of Product Accumulate Codes 产品累积码的可重构FPGA实现
Pub Date : 2007-11-21 DOI: 10.1109/SIPS.2007.4387553
T. Koh, B. Ng, Y. Guan, T. Li
A memory-based, pipelined, serial architecture is developed for implementing product accumulate codes in field programmable gate arrays. A three-stage pipeline structure is exploited on the min-sum decoding algorithm to achieve full utilization of instantiated resources, to reduce latency, and to increase throughput while keeping the performance degradation minimal. Different types of interleavers are investigated and the quadratic permutation polynomial based inter-leaver is shown to be the best choice in terms of implementation cost, reconfigurability and bit error rate performance. The proposed decoder implemented in Xilinx 2v3000FG676-4 chips is capable of processing one full decoding iteration for 1 encoded bit every clock. Thus regardless of the block size, throughput will be determined only by the number of iterations done while latency is linear to block size.
为了在现场可编程门阵列中实现产品累积码,开发了一种基于存储器的流水线串行结构。在最小和译码算法上采用三级管道结构,充分利用实例化资源,减少延迟,提高吞吐量,同时保持性能下降最小。对不同类型的交织器进行了研究,从实现成本、可重构性和误码率性能等方面证明了基于二次置换多项式的交织器是最佳选择。该解码器在Xilinx 2v3000FG676-4芯片上实现,每个时钟能够处理1个编码位的一次完整解码迭代。因此,无论块大小如何,吞吐量将仅由完成的迭代次数决定,而延迟与块大小呈线性关系。
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引用次数: 0
Two-Step Aprroach for Coarse Time Synchronization and Frequency Offset Estimation for IEEE 802.16D Systems IEEE 802.16D系统粗时间同步和频偏估计的两步法
Pub Date : 2007-11-21 DOI: 10.1109/SIPS.2007.4387543
Tae-Hwan Kim, I. Park
Targeting IEEE 802.16d systems, this paper presents a new approach for coarse time synchronization and carrier frequency offset estimation. In contrast to the previous architecture that usually computes both of them jointly within a unified auto-correlator, the proposed one performs them separately to achieve more reliable frequency synchronization and to reduce the overall hardware complexity by optimizing them individually. Experimental results show that the proposed architecture leads to better frequency synchronization compared to the previous joint estimation, and is more efficient in both respects of silicon area and power consumption.
针对IEEE 802.16d系统,提出了一种粗时间同步和载波频偏估计的新方法。与之前通常在一个统一的自相关器中联合计算两者的体系结构相反,本文提出的体系结构将它们分开执行,以实现更可靠的频率同步,并通过单独优化它们来降低整体硬件复杂性。实验结果表明,与之前的联合估计相比,该结构具有更好的频率同步效果,并且在硅面积和功耗方面都具有更高的效率。
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引用次数: 10
A Novel Real-Time Implementation for Network Echo Cancellation System 一种新的网络回波抵消系统实时实现方法
Pub Date : 2007-11-21 DOI: 10.1109/SIPS.2007.4387522
Xinyi Wang, Tingzhi Shen, Wei-jiang Wang
This paper describes a novel structure and its implementation method of a long-distance network echo canceller. The proposed NEC system copes with double talking situations by using a modified double-talk detector. An improved adaptive filter structure is also presented based on algorithm delay estimator. To deal with residual echo after filtering a nonlinear processor is employed. The resulting algorithm enables long-distance network echo cancellation with low computational requirements. It reached grater echo return loss enhancement and shows faster convergences speed as compared with conventional network echo canceller.
本文介绍了一种新型的远距离网络回波消除器结构及其实现方法。提出的NEC系统通过使用改进的双音检测器来处理双音情况。提出了一种改进的基于算法延迟估计的自适应滤波结构。为了处理滤波后的残余回波,采用了非线性处理器。所得到的算法能够以较低的计算量实现远距离网络回波抵消。与传统网络回波消除器相比,回波回波损耗增强更大,收敛速度更快。
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引用次数: 1
Bandwidth Extension of a Narrowband Speech Coder for Music Streaming Services Over IP Networks IP网络上音乐流媒体服务窄带语音编码器的带宽扩展
Pub Date : 2007-11-21 DOI: 10.1109/SIPS.2007.4387608
Young Han Lee, H. Kim
In this paper, we propose a bandwidth extension (BWE) algorithm for a low-bit-rate narrowband CELP coder using a spectral envelope sharing approach to develop a wideband speech coder. The developed wideband speech coder, referred to here as the BWE coder, is constructed using an embedded structure by adding an enhancement layer to the narrowband CELP coder. To minimize the bit-rate increase caused by the enhancement layer, the proposed BWE coder shares the spectral envelope and excitation parameters both with the narrowband CELP coder and the enhancement layer. In this paper, we choose G.729EV layer 2 as the baseline narrowband speech coder, and mel-frequency cepstral coefficients (MFCCs) are used to reconstruct the higher frequency components at the enhancement layer. By doing this, the bit-rate of the proposed BWE coder is found to be 12.7 kbit/s, just 0.7 kbit/s higher than that of G.729EV layer 2. It is also demonstrated from a MUSHRA test with audio signals from four different music genres, that the BWE coder gives better quality than G.729EV layer 2 and comparable quality to G.729EV layer 3, corresponding to an overall bit-rate reduction of 1.3 kbit/s.
在本文中,我们提出了一种带宽扩展(BWE)算法,用于低比特率窄带CELP编码器,使用频谱包络共享方法开发宽带语音编码器。所开发的宽带语音编码器,这里称为BWE编码器,是通过在窄带CELP编码器上添加增强层而采用嵌入式结构构建的。为了使增强层引起的比特率增加最小化,所提出的BWE编码器与窄带CELP编码器和增强层共享频谱包络和激励参数。在本文中,我们选择G.729EV第2层作为窄带语音编码器的基线,并使用mel-frequency倒谱系数(mfccc)在增强层重构高频分量。通过这样做,发现所提出的BWE编码器的比特率为12.7 kbit/s,仅比G.729EV第2层高0.7 kbit/s。通过对四种不同音乐类型的音频信号进行的MUSHRA测试也证明,BWE编码器的质量优于G.729EV第2层,与G.729EV第3层相当,相当于总比特率降低了1.3 kbit/s。
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引用次数: 0
Redundancy Analysis for Variable Length Coding 变长编码的冗余分析
Pub Date : 2007-11-21 DOI: 10.1109/SIPS.2007.4387549
Zhen Mao, Yun He
Typical VLC schemes use fixed Huffman tables, thus the coding efficiency is far from the real Huffman coder. By employing multiple fixed code tables, the performance should be increased and approach the ideal Huffman coder. Since the fixed table VLC method is not the "minimum redundant" one, there is a believe that the redundancy between symbols still exists and there should be methods which could further remove it, and the possible way is encoding concatenation of codewords together, i.e., applying a post-processing on the VLC code streams. Some models are given to describe how much equivalent redundancy exist within the VLC code streams by using the channel coding concepts. Starting from those models, we introduce some modifications to evaluate the inter symbol redundancy for source coding. The estimation based on the models for the redundancies of H.263 and AVS are shown, which may lead us to understand the post-processing efficiency could achieve.
典型的VLC方案使用固定的哈夫曼表,因此编码效率与实际的哈夫曼编码器相差甚远。通过使用多个固定码表,可以提高性能并接近理想的霍夫曼编码器。由于固定表VLC方法不是“最小冗余”的方法,因此认为符号之间的冗余仍然存在,应该有进一步消除冗余的方法,可能的方法是将码字串联在一起进行编码,即对VLC码流进行后处理。利用信道编码的概念,给出了一些描述VLC码流中存在多少等效冗余的模型。从这些模型出发,我们引入了一些改进来评估码元间冗余度。最后给出了基于H.263和AVS的冗余度模型的估计,这有助于我们了解H.263和AVS所能达到的后处理效率。
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引用次数: 0
Reconfigurable Media Coding: A New Specification Model for Multimedia Coders 可重构媒体编码:一种新的多媒体编码器规范模型
Pub Date : 2007-11-21 DOI: 10.1109/SIPS.2007.4387595
Christophe Lucarz, M. Mattavelli, J. Thomas-Kerr, J. Janneck
Multimedia coding technology, after about 20 years of active research, has delivered a rich variety of different and complex coding algorithms. Selecting an appropriate subset of these algorithms would, in principle, enable a designer to produce the codec supporting any desired functionality as well as any desired trade-off between compression performance and implementation complexity. Currently, interoperability demands that this selection process be hard-wired into the normative descriptions of the codec, or at a lower level, into a predefined number of choices, known as profiles, codified within each standard specification. This paper presents an alternative paradigm for codec deployment that is currently under development by MPEG, known as Reconfigurable Media Coding (RMC). Using the RMC framework, arbitrary combinations of fundamental algorithms may be assembled, without predefined standardization, because everything necessary for specifying the decoding process is delivered alongside the content itself. This side-information consists of a description of the bitstream syntax, as well as a description of the decoder configuration. Decoder configuration information is provided as a description of the interconnections between algorithmic blocks. The approach has been validated by development of an RMC format that matches MPEG-4 Video, and then extending the format by adding new chroma-subsampling patterns.
多媒体编码技术经过近20年的积极研究,产生了种类繁多、种类繁多的编码算法。原则上,选择这些算法的适当子集将使设计人员能够生成支持任何所需功能的编解码器,并在压缩性能和实现复杂性之间进行任何所需的权衡。目前,互操作性要求将此选择过程硬连接到编解码器的规范描述中,或者在较低的级别上,将其连接到预定义数量的选择中,称为配置文件,在每个标准规范中编码。本文提出了MPEG目前正在开发的编解码器部署的另一种范例,称为可重构媒体编码(RMC)。使用RMC框架,可以组装基本算法的任意组合,而无需预定义的标准化,因为指定解码过程所需的一切都与内容本身一起交付。这个侧信息包括对比特流语法的描述,以及对解码器配置的描述。提供解码器配置信息作为算法块之间互连的描述。通过开发与MPEG-4 Video匹配的RMC格式验证了该方法,然后通过添加新的色度子采样模式扩展了该格式。
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引用次数: 54
Vision Recognition System by Using Chaotic Search 基于混沌搜索的视觉识别系统
Pub Date : 2007-11-21 DOI: 10.1109/SIPS.2007.4387564
T. Asakura, S. Imamura, M. Minami
This research is concerned with image recognition for a robot vision detecting target objects by using Chaotic Search in model-based matching. As a nonlinear dynamical system to generate a chaos, BVP model is treated, which shows the behavior of neurons in biological system. This model has the "edge of chaos", which exists on the boundary between a periodic solution and a chaos solution. This edge of chaos is an important area to maintain an organization to be flexible. In this research, the Chaotic Search is applied to image recognition utilizing the edge of chaos. First, the occurrence of chaos in BVP model is examined using the Lyapunov exponent. Second, in order to perform image recognition, we propose a method of Chaotic Search in which it can distinguish the target object from surroundings effectively, using a method of pattern matching. Finally, through two illustrative examples, the effectiveness of Chaotic Search is verified for both static and dynamic targets.
研究了基于模型匹配的混沌搜索在机器人视觉图像识别中的应用。作为一个产生混沌的非线性动力系统,对BVP模型进行了处理,该模型反映了生物系统中神经元的行为。该模型具有“混沌边缘”,它存在于周期解和混沌解的边界上。这种混乱的边缘是保持组织灵活性的重要区域。在本研究中,利用混沌边缘将混沌搜索应用于图像识别。首先,利用李雅普诺夫指数检验了混沌在BVP模型中的发生。其次,为了进行图像识别,我们提出了一种混沌搜索方法,该方法利用模式匹配的方法有效地将目标物体与周围环境区分开来。最后,通过两个实例验证了混沌搜索对静态和动态目标的有效性。
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引用次数: 0
Method for Decreasing Computation Load and Memory Access Frequency during Interpolation for Video Coding 视频编码插值过程中降低计算量和内存访问频率的方法
Pub Date : 2007-11-21 DOI: 10.1109/SIPS.2007.4387619
Jung-Yang Kao
This paper proposes a method to address the computation load and memory access frequency problems during interpolation for video processing (coding or decoding). The motion compensation process in video processing is computationally intensive and takes considerable computation time of the system, while the interpolation step in the process incurs the heaviest computation load. Exploiting the characteristics of strong correlation between natural images in a frame, this paper proposes a patented method that stores the computed interpolation values and then manages the values using memory address rotation (MAR) technique to decrease the computation load and memory access frequency.
本文提出了一种解决视频处理(编码或解码)插值过程中计算负荷和内存访问频率问题的方法。视频处理中的运动补偿过程计算量大,占用系统相当大的计算时间,其中插值过程的计算量最大。利用一帧内自然图像之间强相关性的特点,提出了一种将计算得到的插值值存储起来,然后利用内存地址旋转(MAR)技术对插值值进行管理的专利方法,以减少计算量和内存访问频率。
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引用次数: 0
期刊
Proceedings. IEEE Workshop on Signal Processing Systems (2007-2014)
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