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2001 IEEE Workshop on Signal Processing Systems. SiPS 2001. Design and Implementation (Cat. No.01TH8578)最新文献

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Low-power FFT via reduced precision redundancy 低功率FFT通过降低精度冗余
S. Sridhara, Naresh R Shanbhag
We propose a technique for designing low-power fast Fourier transform (FFT) processors with applications in next generation wireless LAN and wireless access systems. The proposed low-power technique is based on the general principle of soft digital signal processing where voltage overscaling (VOS) (scaling the supply voltage beyond the critical voltage V/sub dd-crit/ required for correct operation) is applied in conjunction with algorithmic noise-tolerance (ANT) techniques. We propose an ANT technique referred to as reduced precision redundancy for compensating the degradation in the signal-to-noise ratio (SNR) at an FFT output due to VOS. Simulation results using the proposed scheme with 0.25 /spl mu/m standard CMOS technology show that the power consumption in a butterfly functional unit of an FFT processor can be reduced by 44% over a conventional voltage-scaled system without any SNR loss in the context of a typical orthogonal frequency division multiplexing (OFDM) based WLAN system.
我们提出了一种用于下一代无线局域网和无线接入系统的低功耗快速傅立叶变换(FFT)处理器设计技术。所提出的低功耗技术基于软数字信号处理的一般原理,其中电压过标(VOS)(将电源电压缩放到正确操作所需的临界电压V/sub / d-crit/以上)与算法噪声容限(ANT)技术相结合。我们提出了一种称为降低精度冗余的ANT技术,用于补偿由于VOS导致的FFT输出信噪比(SNR)的下降。采用0.25 /spl mu/m标准CMOS技术的仿真结果表明,在典型的基于正交频分复用(OFDM)的WLAN系统中,FFT处理器蝴蝶功能单元的功耗比传统的电压标度系统降低44%,且没有任何信噪比损失。
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引用次数: 6
SystemC based architecture exploration of a 3D graphic processor 基于SystemC的三维图形处理器架构探索
Tim Kogel, Andreas Wieferink, H. Meyr, A. Kroll
We propose a system level design and refinement methodology based on the SystemC class library. We address design space exploration and performance profiling at the highest possible level of abstraction. System level design starts with the initial functional specification and validation of the system behavior in SystemC. The refinement methodology covers architecture exploration and results in an executable system architecture model, which is able to generate the relevant profiling data and to verify if the chosen architecture meets the performance requirements. We have applied this methodology to a 100 million gate design of a 3D graphic processor. We were able to demonstrate the feasibility and define the final system architecture within 2 months. This 3D processor implements the ray-tracing rendering paradigm on one chip allowing real time rendering of 3D scenes with photo-realistic quality. Based on the results of this case study, we present the benefits of our methodology to define successively a feasible system architecture coping with the processing and memory bandwidth requirements.
提出了一种基于SystemC类库的系统级设计和优化方法。我们在尽可能高的抽象层次上处理设计空间探索和性能分析。系统级设计从系统c中初始的功能规格说明和系统行为的验证开始。精化方法涵盖体系结构探索,并产生可执行的系统体系结构模型,该模型能够生成相关的分析数据,并验证所选择的体系结构是否满足性能需求。我们已将此方法应用于1亿栅极的3D图形处理器设计。我们能够在2个月内演示可行性并定义最终的系统架构。该3D处理器在一个芯片上实现了光线追踪渲染范例,允许实时渲染具有照片逼真质量的3D场景。基于这个案例研究的结果,我们展示了我们的方法的好处,可以连续定义一个可行的系统架构,以应对处理和内存带宽需求。
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引用次数: 11
Implementation of an efficient FIR filter chip for PRML read channels 用于PRML读通道的高效FIR滤波器的实现
J. Kang, B. G. Jo, M. Sunwoo
This paper proposes a low power and area efficient FIR filter chip for partial-response maximum likelihood (PRML) disk drive read channels, which is a 6-b, 8-tap digital FIR filter. The proposed filter employs a parallel processing architecture and consists of four pipeline stages. It uses the modified Booth algorithm for multiplication and compressor logic for addition. CMOS pass-transistor logic is used for low power consumption and single-rail logic is used to reduce the chip area. The proposed filter chip, using the 0.65 /spl mu/m technology, dissipates 120 mW at 100 Hz, uses the 3.3 V power supply and occupies 1.88/spl times/1.38 mm/sup 2/. The chip shows about 11% power reduction and about 15% area reduction compared with existing architectures. This chip was fabricated by Hyundai Semiconductor.
针对部分响应最大似然(PRML)磁盘驱动器读通道,提出了一种低功耗、低面积效率的FIR滤波器芯片,该芯片是一个6-b、8分路的数字FIR滤波器。该滤波器采用并行处理架构,由四个管道阶段组成。它使用改进的Booth算法进行乘法运算,使用压缩逻辑进行加法运算。CMOS通管逻辑用于低功耗,单轨逻辑用于减小芯片面积。所提出的滤波芯片采用0.65 /spl mu/m技术,在100 Hz时耗散120 mW,使用3.3 V电源,占用1.88/spl次/1.38 mm/sup 2/。与现有架构相比,该芯片功耗降低约11%,面积减少约15%。该芯片是现代半导体制造的。
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引用次数: 0
DSP implementation of low computational 3D sound localization algorithm DSP实现低计算量的三维声音定位算法
N. Sakamoto, W. Kobayashi, T. Onoye, I. Shirakawa
This paper describes a DSP implementation of a real-time 3D sound localization algorithm. A distinctive feature of this implementation is that the audible frequency band is divided into three on the basis of the analysis of the effects of sound diffraction, such that in these three subbands specific schemes of the 3D sound localization are devised with the use of an IIR filter, three parametric equalizers, and a comb filter, respectively, so as to be run real-time on a 16-bit fixed-point DSP at a low frequency of 50 MHz, maintaining the high-quality sound localization. As a result, this 3D sound localization scheme can be applied to mobile applications such as headphones and a handy-phone with the use of an embedded DSP.
本文介绍了一种实时三维声音定位算法的DSP实现。这个实现的一个突出特点是,声音频段分为三个的基础上分析声音衍射的影响,这样,在这三个部分波段3 d声音定位的具体方案设计了IIR滤波器的使用,三个参数均衡器,梳状滤波器,分别以16位定点DSP上运行实时的低频50 MHz,保持高质量的声音定位。因此,这种3D声音定位方案可以应用于移动应用程序,如使用嵌入式DSP的耳机和便携式电话。
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引用次数: 8
An efficient shape coding scheme and its codec design 一种高效的形状编码方案及其编解码器设计
Y. Hwang, Yun-Chiang Wang, Shi-Shen Wang
Shape coding is essential for video object based video compression such as MPEG-4. The shape mask specifies a video object's transparency and opaque characteristics during the video composition process. With shape information, we may perform shape-adaptive processing, e.g. shape adaptive DWT, to save both computation and communication overheads. We propose an efficient shape coding scheme called differential chain coding. Experimental results show that it can outperform all existing shape coding methods, including the well-known CAE method. In the decoding phase, we employ the concepts of change pixels and devise a new scheme to construct the binary alpha plane (shape mask) from the shape contour. Based on the proposed scheme, a novel VLSI architecture design for the shape decoder is developed. Synthesis and simulation results also indicate the design can process over 1,800 QCIF frames per second with very little hardware complexity.
形状编码对于基于视频对象的视频压缩(如MPEG-4)至关重要。形状掩码指定视频对象在视频合成过程中的透明和不透明特征。对于形状信息,我们可以执行形状自适应处理,例如形状自适应DWT,以节省计算和通信开销。我们提出了一种高效的形状编码方案,称为差分链编码。实验结果表明,该方法优于现有的所有形状编码方法,包括著名的CAE编码方法。在解码阶段,我们采用改变像素的概念,设计了一种由形状轮廓构造二值阿尔法平面(形状掩模)的新方案。在此基础上,提出了一种新的形状解码器的VLSI结构设计。综合和仿真结果也表明,该设计可以在极低的硬件复杂度下每秒处理超过1800个QCIF帧。
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引用次数: 19
A catastrophic error mode in adaptive predictive DIR equalisation of dynamic channels 动态信道自适应预测DIR均衡中的灾难性误差模式
M. Boyle, A. Fagan
The use of a linear equaliser to shorten the impulse response of a channel to a shorter desired impulse response (DIR) prior to a Viterbi algorithm (VA) detection of the data is a well-known technique. Also OFDM systems often require channel truncation. It has previously been shown that for dynamic channels it is beneficial to operate a number of equalisers in parallel, each targeted on a different DIR. Each equaliser is followed by an individual VA. A simple decision rule is used to select which of the VA outputs is presented as the actual decision. We refer to this strategy as switched DIR equalisation. A catastrophic error mode is observed in the operation of adaptive DIR systems in slowly varying channels. This error mode causes the equaliser to become severely maladjusted. The system cannot spontaneously recover from this situation. This paper reviews the switched DIR equalisation system and explains the mechanism underlying the error mode in the adaptive DIR system. Simulation results are presented that indicate the efficacy of the dual switched DIR MLSE-VA to operate successfully in comparison to adaptive DIR MLSE-VA systems in time varying frequency selective Rayleigh fading channels.
在Viterbi算法(VA)检测数据之前,使用线性均衡器将信道的脉冲响应缩短到更短的期望脉冲响应(DIR)是一种众所周知的技术。此外,OFDM系统通常需要信道截断。以前已经证明,对于动态通道,并行操作多个均衡器是有益的,每个均衡器针对不同的DIR。每个均衡器后跟一个单独的VA。使用一个简单的决策规则来选择哪个VA输出作为实际决策。我们将此策略称为切换DIR均衡。在缓慢变化的信道中,自适应DIR系统的工作存在灾难性的误差模式。这种误差模式导致均衡器变得严重失调。系统不能自发地从这种情况中恢复。本文综述了切换式DIR均衡系统,并解释了自适应DIR系统中误差模式产生的机理。仿真结果表明,与自适应DIR MLSE-VA系统相比,双开关DIR MLSE-VA系统在时变频率选择性瑞利衰落信道中运行良好。
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引用次数: 1
High speed downlink packet access (HSDPA)-the path towards 3.5G 高速下行分组接入(HSDPA)——迈向3.5G的路径
P. Mogensen
Summary form only given, as follows. High speed downlink packet access (HSDPA) is currently being standardized in 3GPP for R5 and R6. HSDPA offers peak data rates exceeding 10 Mbit/s and significantly enhances the spectral efficiency of UMTS for packet services compared to R99. The draft HSDPA specifications includes advanced concepts of: adaptive modulation and coding schemes (up to 64 QAM); fast SAW hybrid ARQ; fast packet scheduling; potentially, also, fast cell selection and MIMO channel concepts.
仅给出摘要形式,如下。高速下行分组接入(HSDPA)目前正在3GPP中进行R5和R6的标准化。HSDPA提供超过10mbit /s的峰值数据速率,与R99相比,显著提高了UMTS的分组业务频谱效率。HSDPA规范草案包括以下先进概念:自适应调制和编码方案(高达64 QAM);快速SAW混合ARQ;快速分组调度;潜在的,还有快速小区选择和MIMO信道概念。
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引用次数: 3
Efficient implementation of low bit rate 1.6 Kbps speech coder using field programmable gate arrays 使用现场可编程门阵列高效实现低比特率1.6 Kbps语音编码器
Han-Chiang Chen
The cost-effective hardware architecture of a low bit rate 1.6 Kbit/s LPC (linear predictive coefficient)-based vocoder is proposed. The proposed architecture integrates both algorithms of the encoder and decoder. In the encoder, a simple finite state machine is presented to compute the autocorrelation function of speech. At the decoder side, efficient circuits are designed to transfer LSP (lne spectrum pair) to LPC. Only 29000 gate counts of XILINX XC4036XL FPGA are used to implement the vocoder.
提出了一种低比特率1.6 Kbit/s基于线性预测系数(LPC)的声码器的低成本硬件结构。该架构集成了编码器和解码器两种算法。在编码器中,提出了一个简单的有限状态机来计算语音的自相关函数。在解码器端,设计了有效的电路将LSP(线频谱对)传输到LPC。仅使用XILINX XC4036XL FPGA的29000个门数来实现声码器。
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引用次数: 2
VLSI implementation-oriented (3, k)-regular low-density parity-check codes 面向VLSI实现的(3,k)规则低密度奇偶校验码
Tong Zhang, K. Parhi
In the past few years, Gallager's low-density parity-check (LDPC) codes received a lot of attention and many efforts have been devoted to analyzing and improving their error-correcting performance. However, little consideration has been given to the LDPC decoder VLSI implementation. The straightforward fully parallel decoder architecture usually incurs too high complexity for many practical purposes and should be transformed to a partly parallel realization. Unfortunately, due to the randomness of LDPC codes, it is nearly impossible to develop an effective transformation for an arbitrarily given LDPC code. We propose a joint code and decoder design approach to construct a class of (3, k)-regular LDPC codes which exactly fit a partly parallel decoder implementation and have a very good performance. Moreover, for such LDPC codes, we propose a systematic, efficient encoding scheme by effectively exploiting the sparseness of its parity check matrix.
近年来,Gallager的低密度奇偶校验码(LDPC)受到了广泛的关注,人们对其纠错性能进行了分析和改进。然而,LDPC解码器的VLSI实现很少被考虑。直接的全并行解码器架构对于许多实际用途来说通常会产生太高的复杂性,应该转换为部分并行实现。不幸的是,由于LDPC码的随机性,几乎不可能对任意给定的LDPC码进行有效的转换。我们提出了一种编码和解码器的联合设计方法来构造一类(3,k)-正则LDPC码,它完全适合部分并行解码器的实现,并且具有非常好的性能。此外,对于这种LDPC码,我们提出了一种系统的、高效的编码方案,有效地利用了其奇偶校验矩阵的稀疏性。
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引用次数: 82
Analysis of wavelet transform implementations for image and texture coding applications in programmable platforms 小波变换在图像和纹理编码中的应用分析
Y. Andreopoulos, P. Schelkens, J. Cornelis
This paper compares various software implementations of the 2D binary-tree wavelet decomposition by analyzing the data-related cache penalties in processor-based platforms. Such penalties appear to be the dominant factors that determine performance in this type of application. The comparisons include various image-scanning techniques, from the classical row-column approach to the local wavelet transform and the line-based wavelet transform, which are proposed in the framework of multimedia coding standards. For a conflict-free cache model, a theoretical framework is constructed allowing for predictions of the data-cache penalties that are expected to diminish the system performance. The theoretical results are verified with measurements from simulations and also from a real platform.
本文通过分析基于处理器的平台中数据相关的缓存惩罚,比较了二维二叉树小波分解的各种软件实现。这种惩罚似乎是决定这类应用程序性能的主要因素。比较了多媒体编码标准框架下提出的各种图像扫描技术,从经典的行-列方法到局部小波变换和基于线的小波变换。对于无冲突缓存模型,构建了一个理论框架,允许预测预计会降低系统性能的数据缓存惩罚。理论结果与仿真和实际平台的测量结果进行了验证。
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引用次数: 12
期刊
2001 IEEE Workshop on Signal Processing Systems. SiPS 2001. Design and Implementation (Cat. No.01TH8578)
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