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巨磁电阻在数据存储领域的应用 被引量:2
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作者 颜冲 于军 +4 位作者 王耘波 周文利 高俊雄 王华 周东祥 《信息记录材料》 2001年第1期28-31,54,共5页
用巨磁电阻 (GMR)材料构成的磁电子学新器件,已成功地应用于计算机存储领域。介绍了用于计算机硬磁盘驱动器的巨磁电阻磁头和巨磁电阻随机存取存储器,描述了它们的工作原理、性能特点及研究现状和发展趋势。
关键词 巨磁电阻 读出磁出 储密度 随机存储器 非易失性 计算机 硬磁盘驱动器
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GSVM:一种支持Gather/Scatter的向量存储器
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作者 陈海燕 刘胜 吴健虢 《国防科技大学学报》 EI CAS CSCD 北大核心 2020年第3期1-8,共8页
宽单指令多数据流(Single Instruction Multiple Data,SIMD)架构数字信号处理器一般都能高效支持地址连续或等距跨步等规则应用的向量访存,但对于科学与工程计算中广泛存在的不规则应用的数据访存则带宽利用率往往较低,从而大幅降低了... 宽单指令多数据流(Single Instruction Multiple Data,SIMD)架构数字信号处理器一般都能高效支持地址连续或等距跨步等规则应用的向量访存,但对于科学与工程计算中广泛存在的不规则应用的数据访存则带宽利用率往往较低,从而大幅降低了其整体运算能效。为了提高不规则应用的向量访存性能,基于某SIMD数字信号处理器的体系结构,设计了一种支持Gather/Scatter访存的向量存储器GSVM。通过设计与SIMD宽度相匹配的向量地址计算单元和合适深度的冲突缓冲器阵列,实现了Gather/Scatter指令向量地址计算、仲裁与缓存的全流水访存操作。实验结果表明,相比以前不支持Gather/Scatter访存的存储器,GSVM在增加22%的硬件代价基础上,基于稀疏矩阵向量乘的测试程序集获得了2~8的性能加速比。 展开更多
关键词 单指令多数据流 Gather/Scatter 向量随机访 访冲突
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ITO用作铁电薄膜电极的研究 被引量:6
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作者 李金华 陈汉松 +2 位作者 李坤 汤国英 陈王丽华 《功能材料》 EI CAS CSCD 北大核心 2001年第1期64-66,共3页
研究了sol -gel掺锡氧化铟 (ITO)溶胶在SiO2 /Si衬底和光学玻璃衬底上的成膜及结晶性能 ,并与CVD法生长的ITO薄膜作了对比。结论是 ,sol -gelITO膜 ,虽然具有与CVDITO膜相似的结晶性能和较高的导电性 ,但以sol -gelITO膜作下电极 ,无法... 研究了sol -gel掺锡氧化铟 (ITO)溶胶在SiO2 /Si衬底和光学玻璃衬底上的成膜及结晶性能 ,并与CVD法生长的ITO薄膜作了对比。结论是 ,sol -gelITO膜 ,虽然具有与CVDITO膜相似的结晶性能和较高的导电性 ,但以sol -gelITO膜作下电极 ,无法使PLT、PZT的sol -gel膜具有明显的结晶取向。因漏电太大 ,sol -gelITO也无法作sol -gel铁电膜 (如PLT ,PZT)的上电极。但在CVDITO膜上 ,sol -gel铁电膜能很好结晶 ,且Au/PLT/ITO电容 ,具有良好的电学性能。 展开更多
关键词 ITO薄膜 铁电电容电极 SOL-GEL法 FERAM 随机存
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磁导体电子学信息功能材料
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作者 赖武彦 《材料导报》 EI CAS CSCD 2001年第1期6-7,共2页
纳米尺度超薄膜的制备和结构表征,催生了一门新学科--磁导体电子学.制备方法的改进促进了磁导体电子学器件的产业化.它在计算机信息功能上有重要应用.计算机信息量的运算和存取是信息功能的两个侧面,必须平衡发展.巨磁电阻(GMR)硬盘的... 纳米尺度超薄膜的制备和结构表征,催生了一门新学科--磁导体电子学.制备方法的改进促进了磁导体电子学器件的产业化.它在计算机信息功能上有重要应用.计算机信息量的运算和存取是信息功能的两个侧面,必须平衡发展.巨磁电阻(GMR)硬盘的存储密度已达11Gbits/in2,这个突破性进展缓解了失衡.非易失性磁随机存储器(MRAM)是磁导体电子学器件又一新成果.利用现有微电子技术,可以尽快实现其产业化. 展开更多
关键词 磁导体电子学 纳米薄膜 巨磁电阻 隧道磁电阻 随机存诸器 信息功能材料
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Total Dose Radiation Hardened PDSOI CMOS 64k SRAMs 被引量:1
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作者 郭天雷 赵发展 +6 位作者 刘刚 李多力 李晶 赵立新 周小茵 海潮和 韩郑生 《Journal of Semiconductors》 EI CAS CSCD 北大核心 2007年第8期1184-1186,共3页
The first domestic 1×10^6rad(Si) total dose hardened 1.2μm partially depleted silicon-on-insulator (PDSOI) 64k SRAM fabricated in SIMOX is demonstrated.The address access time is independent of temperature f... The first domestic 1×10^6rad(Si) total dose hardened 1.2μm partially depleted silicon-on-insulator (PDSOI) 64k SRAM fabricated in SIMOX is demonstrated.The address access time is independent of temperature from -55 to 125℃ and independent of radiation up to 1×10^6rad(Si) for the supply voltage VDD.The standby current is 0.65μA before the total dose of radiation and is only 0.80mA after radiation exposure,which is much better than the specified 10mA.The operating power supply current is 33.0mA before and only 38.1mA afterward,which is much better than the specified 100mA. 展开更多
关键词 PDSOI SRAM total dose RADIATION
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Application of Inventory Theory in Service Stations
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作者 李鑫 陈大恩 《Petroleum Science》 SCIE CAS CSCD 2004年第3期93-96,共4页
A service station plays an important role in the petroleum product distribution terminal. With the increase in petroleum consumption in China, the inventory theory should be applied in the stock control of service st... A service station plays an important role in the petroleum product distribution terminal. With the increase in petroleum consumption in China, the inventory theory should be applied in the stock control of service stations. In this paper the inventory theory including its background and characteristics is introduced. At the same time, the application of the theory in some trades today, especially in petroleum trade, is analyzed. Then (s, S) stochastic model is advanced, which is established according to the principle of operational research and, based on this model, a sample is given, which discusses the details of application in the stock control of service stations. The sample is simplified but implies the validity of the model in optimizing the storage of petroleum products in the market. 展开更多
关键词 Inventory theory service station stock management stochastic model
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Seismic data reconstruction based on CS and Fourier theory 被引量:10
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作者 张华 陈小宏 吴信民 《Applied Geophysics》 SCIE CSCD 2013年第2期170-180,236,共12页
Traditional seismic data sampling follows the Nyquist sampling theorem. In this paper, we introduce the theory of compressive sensing (CS), breaking through the limitations of the traditional Nyquist sampling theore... Traditional seismic data sampling follows the Nyquist sampling theorem. In this paper, we introduce the theory of compressive sensing (CS), breaking through the limitations of the traditional Nyquist sampling theorem, rendering the coherent aliases of regular undersampling into harmless incoherent random noise using random undersampling, and effectively turning the reconstruction problem into a much simpler denoising problem. We introduce the projections onto convex sets (POCS) algorithm in the data reconstruction process, apply the exponential decay threshold parameter in the iterations, and modify the traditional reconstruction process that performs forward and reverse transforms in the time and space domain. We propose a new method that uses forward and reverse transforms in the space domain. The proposed method uses less computer memory and improves computational speed. We also analyze the antinoise and anti-aliasing ability of the proposed method, and compare the 2D and 3D data reconstruction. Theoretical models and real data show that the proposed method is effective and of practical importance, as it can reconstruct missing traces and reduce the exploration cost of complex data acquisition. 展开更多
关键词 Fourier transform compressive sensing (CS) projection onto convex sets (POCS) data reconstruction
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神威太湖之光加速计算在脑神经网络模拟中的应用 被引量:6
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作者 栗学磊 朱效民 +1 位作者 魏彦杰 冯圣中 《计算机学报》 EI CSCD 北大核心 2020年第6期1024-1036,共13页
脑神经网络模拟是脑科学研究和理论验证的重要方法.为提高脑模拟速度,异构加速已开始应用于脑模拟.然而现有异构加速脑模拟软件均存在明显的访存性能和计算精度问题.为此,本文基于神威太湖之光研发了脑模拟软件SWsnn,确保了随机访存多... 脑神经网络模拟是脑科学研究和理论验证的重要方法.为提高脑模拟速度,异构加速已开始应用于脑模拟.然而现有异构加速脑模拟软件均存在明显的访存性能和计算精度问题.为此,本文基于神威太湖之光研发了脑模拟软件SWsnn,确保了随机访存多发生在高速缓存中.为避免主存访问的随机性,将频繁出现随机访存且数据量较小的神经元信息长时间停留在局部存储(LDM),同时将数据量很大的突触连接数据存储在主存,且尽可能连续访问主存.为避免可塑性导致的对突触连接的随机搜索,对脉冲时间依赖可塑性(STDP)算法采用需要前再更新的方法,以确保主存访问的连续性.为了提高脑模拟精度,设计环形缓冲和延迟传送联合应用方法,以支持高精度时间步长的脑模拟.在此基础上,对SWsnn进行向量化、访存隐藏等优化操作,计算性能进一步提高约50%.SWsnn对104神经元全连接网络实现了生物实时模拟,比同等规模浮点计算能力GPU上运行的CARLsim快10倍左右. 展开更多
关键词 脉冲神经网络(SNN) 脑模拟 SW26010 随机访 环形缓冲 神威太湖之光
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Design of RTD-Based TSRAM
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作者 程玥 潘立阳 许军 《Journal of Semiconductors》 EI CAS CSCD 北大核心 2004年第2期138-142,共5页
A RTD-based TSRAM cell is introduced.The mechanism of different types of access transistors in this cell is described and NMOS is found most suitable from consideration of the cell size and power consumption.The archi... A RTD-based TSRAM cell is introduced.The mechanism of different types of access transistors in this cell is described and NMOS is found most suitable from consideration of the cell size and power consumption.The architecture of a TSRAM system is presented.Simulation results show that the RTD-based TSRAM has advanced characteristics of small area,low power,and high speed. 展开更多
关键词 RTD TSRAM high speed low power
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IDENTITY-BASED KEY-INSULATED PROXY SIGNATURE 被引量:4
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作者 Wan Zhongmei Lai Xuejia +2 位作者 Weng Jian Liu Shengli Hong Xuan 《Journal of Electronics(China)》 2009年第6期853-858,共6页
In proxy signature schemes,the proxy signer B is permitted to produce a signature on behalf of the original signer A. However,exposure of proxy signing keys can be the most devastating attack on a proxy signature sche... In proxy signature schemes,the proxy signer B is permitted to produce a signature on behalf of the original signer A. However,exposure of proxy signing keys can be the most devastating attack on a proxy signature scheme since any adversary can sign messages on behalf of the proxy signer. In this paper,we applied Dodis,et al.’s key-insulation mechanism and proposed an Identity-Based (ID-based) Key-Insulated Proxy Signature (IBKIPS) scheme with secure key-updates. The proposed scheme is strong key-insulated and perfectly key-insulated. Our scheme also supports unbounded period numbers and random-access key-updates. 展开更多
关键词 KEY-INSULATED Proxy signature Identity-based signature Key-exposure Bilinear pairings
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Comparative study of laparoscopic vs open gastrectomy in gastric cancer management 被引量:9
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作者 Giuseppe S Sica Edoardo Iaculli +5 位作者 Livia Biancone Sara Di Carlo Rosa Scaramuzzo Cristina Fiorani Paolo Gentileschi Achille L Gas-pari 《World Journal of Gastroenterology》 SCIE CAS CSCD 2011年第41期4602-4606,共5页
AIM:To compare long-term results of gastric cancer patients undergoing laparoscopic and open gastrec-tomy in a single unit.METHODS:From February 2000 to September 2004,all patients with adenocarcinoma of the stomach w... AIM:To compare long-term results of gastric cancer patients undergoing laparoscopic and open gastrec-tomy in a single unit.METHODS:From February 2000 to September 2004,all patients with adenocarcinoma of the stomach were assessed to entry in this longitudinal prospective non-randomized trial.Primary endpoint was cancer-related survival and secondary endpoints were overall survival,evaluation of surgical complications and mortality.RESULTS:Fifty-eight patients were enrolled.Forty-seven patients were followed-up(range 11-103,me-dian 38 mo).Four patients were lost at follow up.Twenty-two patients underwent a laparoscopic gastric surgery(LGS)and 25 had a standard open procedure(OGS).No statistical difference was found between the two groups in terms of 5 years cancer-related mortality rate(50% vs 52%,P = 1),and 5 years overall mortal-ity rate(54.5% vs 56%,P = 1).Accordingly,cancer-related and overall survival probability by Kaplan-Meier method showed comparable results(P = 0.81 and P = 0.83,respectively).We found no differences in surgical complications in the 2 groups.There was no conversion to open surgery in this series.CONCLUSION:LGS is as effective as OGS in the man-agement of advanced gastric cancer.However LGS can-not be recommended routinely over OGS for the treat-ment of advanced gastric cancer. 展开更多
关键词 Advanced gastric cancer LAPAROSCOPY Lap-aroscopic cancer surgery Longterm outcomes SURVIVAL
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New Generation Processor Architecture Research 被引量:1
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作者 陈红松 Hu +2 位作者 Mingzeng Ji Zhenzhou 《High Technology Letters》 EI CAS 2003年第4期94-96,共3页
With the rapid development of microelectronics and hardware,the use of ever faster micro processors and new architecture must be continued to meet tomorrow′s computing needs. New processor microarchitectures are need... With the rapid development of microelectronics and hardware,the use of ever faster micro processors and new architecture must be continued to meet tomorrow′s computing needs. New processor microarchitectures are needed to push performance further and to use higher transistor counts effectively.At the same time,aiming at different usages,the processor has been optimized in different aspects,such as high performace,low power consumption,small chip area and high security. SOC (System on chip)and SCMP (Single Chip Multi Processor) constitute the main processor system architecture. 展开更多
关键词 new microarchitecture development trend reusing explore parallelism
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Novel Operation Mechanism of Capacitorless DRAM Cell Using Impact Ionization and GIDL Effects 被引量:1
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作者 Huibin Tao Jianing Hou Zhibiao Shao 《Computer Technology and Application》 2013年第7期351-355,共5页
A novel operation mechanism of capacitorless SOl-DRAM (silicon on insulator dynamic random access memory) cell using impact ionization and GIDL (gated-induce drain leakage) effects for write "1" operation was pr... A novel operation mechanism of capacitorless SOl-DRAM (silicon on insulator dynamic random access memory) cell using impact ionization and GIDL (gated-induce drain leakage) effects for write "1" operation was proposed. The conventional capacitorless DRAM cell with single charge generating effect is either high speed or low power, while the proposed DG-FinFET (double-gate fin field effect transistor) cell employs the efficient integration of impact ionization and GIDL effects by coupling the front and back gates with optimal body doping profile and proper bias conditions, yielding high speed low power performance. The simulation results demonstrate ideal characteristics in both cell operations and power consumption. Low power consumption is achieved by using GIDL current at 0. luA when the coupling between the front and back gates restrains the impact ionization current in the first phase. The write operation of the cell is within Ins attributed to significant current of the impact ionization effect in the second phase. By shortening second phase, power consumption could be further decreased. The ratio of read "1" and read "0" current is more than 9.38E5. Moreover, the cell has great retention characteristics. 展开更多
关键词 DRAM CELL IONIZATION GIDL effects.
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Random Access and Resource Allocation for the Coexistence of NOMA-Based and OMA-Based M2M Communications 被引量:2
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作者 Yali Wu Guixia Kang Ningbo Zhang 《China Communications》 SCIE CSCD 2017年第6期43-53,共11页
In the future fifth generation(5G) systems,non-orthogonal multiple access(NOMA) is a promising technology that can greatly enhance the network capacity compared to orthogonal multiple access(OMA) .In this paper,we pro... In the future fifth generation(5G) systems,non-orthogonal multiple access(NOMA) is a promising technology that can greatly enhance the network capacity compared to orthogonal multiple access(OMA) .In this paper,we propose a novel random access(RA) and resource allocation scheme for the coexistence of NOMA-based and OMAbased machine-to-machine(M2M) communications,which aims at improving the number of successful data packet transmissions and guaranteeing the quality of service(Qo S) (e.g.,the minimum data rate requirement) for M2 M communications.The algorithm of joint user equipment(UE) paring and power allocation is proposed for the coexisting RA(i.e.,the coexistence of NOMA-based RA and OMA-based RA) .The resource allocation for the coexisting RA is investigated,thus improving the number of successful data packet transmissions by more efficiently using the radio resources.Simulation results demonstrate that the proposed RA and resource allocation scheme outperforms the conventional RA in terms of the number of successful data packet transmissions,thus is a promising technology in future M2 M communications. 展开更多
关键词 machine-to-machine communications random access non-orthogonal multiple access user equipment paring power allocation resource allocation
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Modeling and analysis of cloud computing system survivability based on Bio-PEPA 被引量:1
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作者 Zhao Guosheng Ren Mengqi +1 位作者 Wang Jian Liao Yiwei 《Journal of Southeast University(English Edition)》 EI CAS 2018年第1期21-27,共7页
For the cloud computing system,combined wth the memory function and incomplete matching of the biological immune system,a formal modeling and analysis method of the cloud computing system survivability is proposed by ... For the cloud computing system,combined wth the memory function and incomplete matching of the biological immune system,a formal modeling and analysis method of the cloud computing system survivability is proposed by analyzing the survival situation of critical cloud services.First,on the basis of the SAIR(susceptible,active,infected,recovered)model,the SEIRS(susceptible,exposed,infected,recovered,susceptible)model and the vulnerability diffusion model of the distributed virtual system,the evolution state of the virus is divided into six types,and then the diffusion rules of the virus in the service domain of the cloud computing system and the propagation rules between service domains are analyzee.Finally,on the basis of Bio-PEPA(biological-performance evaluation process algebra),the formalized modeling of the survivability evolution of critical cloud services is made,and the SLIRAS(susceptible,latent,infected,recovered,antidotal,susceptible)model is obtained.Based on the stochastic simulation and the ODEs(ordinary differential equations)simulation of the Bio-PEPA model,the sensitivity parameters of the model are analyzed from three aspects,namely,the virus propagation speed of inter-domain,recovery ability and memory ability.The results showthat the proposed model has high approximate fitting degree to the actual cloud computing system,and it can well reflect the survivable change of the system. 展开更多
关键词 cloud computing system Bio-I>EPA(biologicalperformance evaluation process algebra) SURVIVABILITY stochastic simulation
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Effects of Tai Chi Chuan training on cellular immunity in post-surgical non-small cell lung cancer survivors:A randomized pilot trial 被引量:3
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作者 Ya-Jun Zhang Ru Wang +1 位作者 Pei-Jie Chen Ding-Hai Yu 《Journal of Sport and Health Science》 SCIE 2013年第2期104-108,共5页
Background: Although emerging evidence points to benefits from Tai Chi Chuan (TCC) in improving immune system function, its effects on cellular immune responses remain under-studied. The objective of this study was... Background: Although emerging evidence points to benefits from Tai Chi Chuan (TCC) in improving immune system function, its effects on cellular immune responses remain under-studied. The objective of this study was to evaluate the effects of TCC training on cellular immunity in non-small cell lung cancer patients. Methods: A 2-group randomized trial design in which post-surgical, non-small cell lung cancer survivors were randomly assigned to a TCC training group (n = 16) or a control group (n = 16). The participants in the TCC group completed a 16-week intervention. The main immune response outcome measures assayed included the ratio of T-helper cells/T-suppressor cells (CD4+:CD8+ ratio) and complement regulatory proteins status (CRPs; CD55 and CD59). Using repeated measures ANOVA, the data were analyzed for the participants who completed the study (n = 27). Results: At 16 weeks, the TCC participants showed a significantly lower increment in the expression of CD55 (p 〈 0.05) as compared to the control group. No significant between-group differences were found in the CD4+:CD8+ ratio or CD59 expression. There were also no significant correlations among the changes in CRPs or T lymphocyte subpopulations, either. Conclusion: A 16-week TCC intervention caused no alterations in CD4+:CD8+ ratio, but significantly attenuated CD55 expression among post- surgical non-small cell lung cancer survivors. 展开更多
关键词 Complement regulatory proteins IMMUNITY Non-small cell lung cancer Tai Chi Chuan
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Efficient Hierarchical Structure of Wavelet-Based Compression for Large Volume Data Sets
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作者 柯永振 张加万 +1 位作者 孙济洲 李佳明 《Transactions of Tianjin University》 EI CAS 2006年第5期378-382,共5页
With volume size increasing, it is necessary to develop a highly efficient compression algorithm, which is suitable for progressive refinement between the data server and the browsing client. For three-dimensional lar... With volume size increasing, it is necessary to develop a highly efficient compression algorithm, which is suitable for progressive refinement between the data server and the browsing client. For three-dimensional large volume data, an efficient hierarchical algorithm based on wavelet compression was presented, using intra-band dependencies of wavelet coefficients. Firstly, after applying blockwise hierarchical wavelet decomposition to large volume data, the block significance map was obtained by using one bit to indicate significance or insignificance of the block. Secondly, the coefficient block was further subdivided into eight sub-blocks if any significant coefficient existed in it, and the process was repeated, resulting in an incomplete octree. One bit was used to indicate significance or insignificance, and only significant coefficients were stored in the data stream. Finally, the significant coefficients were quantified and compressed by arithmetic coding. The experimental results show that the proposed algorithm achieves good compression ratios and is suited for random access of data blocks. The results also show that the proposed algorithm can be applied to progressive transmission of 3D volume data. 展开更多
关键词 WAVELET compression large volume data fast random access OCTREE
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Power Ramping Schemes for M2M and H2H Co-existing Scenario
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作者 田辉 徐玲玲 +2 位作者 裴郁杉 刘自强 杨蕴 《China Communications》 SCIE CSCD 2013年第3期100-113,共14页
To analyze and reduce the impact of Machine-to-Machine (M2M) Devices (MDs) on the traditional Human-to-Human (H2H) users for the blending scenario, where both M2M and H2H services coexist in the current Universal Mobi... To analyze and reduce the impact of Machine-to-Machine (M2M) Devices (MDs) on the traditional Human-to-Human (H2H) users for the blending scenario, where both M2M and H2H services coexist in the current Universal Mobile Telecommunication System (UMTS) and perform the Random Access (RA) procedure simultaneously, a comprehensive RA analysis model of RA is proposed in this paper. Further, a power ramping strategy based on the logarithm for M2M is proposed. The efficiency of both the existing and proposed scheme is assessed through a simulation across several metrics, including average target power, throughput, blocking probability, and delay statistics. Numerical results show that the proposed algorithm can ensure a minimal impact on H2H communication while maintaining the throughput of the M2M communication. Meanwhile, because of its low energy consumption, this algorithm has a significant guide value for real-world applications. 展开更多
关键词 H2H M2M Internet of Things power ramping scheme UMTS
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Impacts of NBTI/PBTI on power gated SRAM
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作者 黄平 邢座程 《Journal of Central South University》 SCIE EI CAS 2013年第5期1298-1306,共9页
A signal probability and activity probability (SPAP) model was proposed firstly, to estimate the impacts of the negative bias temperature instability (NBTI) and positive bias temperature instability (PBTI) on power ga... A signal probability and activity probability (SPAP) model was proposed firstly, to estimate the impacts of the negative bias temperature instability (NBTI) and positive bias temperature instability (PBTI) on power gated static random access memory (SRAM). The experiment results show that PBTI has significant influence on the read and write operations of SRAM with power gating, and it deteriorates the NBTI effects and results in a up to 39.38% static noise margin reduction and a 35.7% write margin degradation together with NBTI after 106 s working time. Then, a circuit level simulation was used to verify the assumption of the SPAP model, and finally the statistic data of CPU2000 benchmarks show that the proposed model has a reduction of 3.85% for estimation of the SNM degradation after 106 s working time compared with previous work. 展开更多
关键词 negative bias temperature instability (NBTI) positive bias temperature instability (PBTI) static random access memory(SRAM) power gating
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Design and implementation of FFT/IFFT in IEEE 802.16d OFDM system
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作者 亓中瑞 张浩 +2 位作者 邱昕 刘壹 陈杰 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2009年第6期776-780,共5页
The IEEE 802. 16 standard specifies the air interface of wireless metropolitan area network (WMAN), and aims to provide wireless broadband access for integrated voice and video services. This paper presents the effi... The IEEE 802. 16 standard specifies the air interface of wireless metropolitan area network (WMAN), and aims to provide wireless broadband access for integrated voice and video services. This paper presents the efficient design and implementation of fast Frouier transform (FFT) and inverse fast Frouier transform (IFFT) for the application in IEEE 802. 16d orthogoual frequency division multiplexing (OFDM) system. In this design, a novel pipeline structure for the branch of butterfly unit (BU) is proposed, which can improve the processing symbol rate by adding the number of branch flexibly. The symmetrical ping-pang structure of random access memory (RAM) is performed to increase the system throughput. Simulation results reveal that only with 1 branch of BU, the proposed FFF/IFFT design can almost achieve the maximum bandwidth requirement of IEEE 802. 16d OFDM system. And this design has been verified by FPGA and successfully implemented in the prototype of WiMAX transceiver. 展开更多
关键词 FFT/IFFT OFDM pipeline structure branch of butterfly un-it symmetrical ping-pang structure
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