歐幾里德算法:輾轉(zhuǎn)求余 原理: gcd(a,b)=gcd(b,a mod b) 當(dāng)b為0時(shí),兩數(shù)的最大公約數(shù)即為a getchar()會(huì)接受前一個(gè)scanf的回車符
標(biāo)簽: gcd getchar scanf mod
上傳時(shí)間: 2014-01-10
上傳用戶:2467478207
數(shù)據(jù)結(jié)構(gòu)課程設(shè)計(jì) 數(shù)據(jù)結(jié)構(gòu)B+樹 B+ tree Library
標(biāo)簽: Library tree 數(shù)據(jù)結(jié)構(gòu) 樹
上傳時(shí)間: 2013-12-31
上傳用戶:semi1981
Getting to Know the FFT What is the FFT? FFT = Fast Fourier Transform. The FFT is a faster version of the Discrete Fourier Transform (DFT). The FFT utilizes some clever algorithms to do the same thing as the DTF, but in much less time.
標(biāo)簽: FFT the Transform Getting
上傳時(shí)間: 2017-07-15
上傳用戶:com1com2
* 高斯列主元素消去法求解矩陣方程AX=B,其中A是N*N的矩陣,B是N*M矩陣 * 輸入: n----方陣A的行數(shù) * a----矩陣A * m----矩陣B的列數(shù) * b----矩陣B * 輸出: det----矩陣A的行列式值 * a----A消元后的上三角矩陣 * b----矩陣方程的解X
上傳時(shí)間: 2015-07-26
上傳用戶:xauthu
(1) 、用下述兩條具體規(guī)則和規(guī)則形式實(shí)現(xiàn).設(shè)大寫字母表示魔王語言的詞匯 小寫字母表示人的語言詞匯 希臘字母表示可以用大寫字母或小寫字母代換的變量.魔王語言可含人的詞匯. (2) 、B→tAdA A→sae (3) 、將魔王語言B(ehnxgz)B解釋成人的語言.每個(gè)字母對(duì)應(yīng)下列的語言.
上傳時(shí)間: 2013-12-30
上傳用戶:ayfeixiao
1.有三根桿子A,B,C。A桿上有若干碟子 2.每次移動(dòng)一塊碟子,小的只能疊在大的上面 3.把所有碟子從A桿全部移到C桿上 經(jīng)過研究發(fā)現(xiàn),漢諾塔的破解很簡單,就是按照移動(dòng)規(guī)則向一個(gè)方向移動(dòng)金片: 如3階漢諾塔的移動(dòng):A→C,A→B,C→B,A→C,B→A,B→C,A→C 此外,漢諾塔問題也是程序設(shè)計(jì)中的經(jīng)典遞歸問題
標(biāo)簽: 移動(dòng) 發(fā)現(xiàn)
上傳時(shí)間: 2016-07-25
上傳用戶:gxrui1991
1. 下列說法正確的是 ( ) A. Java語言不區(qū)分大小寫 B. Java程序以類為基本單位 C. JVM為Java虛擬機(jī)JVM的英文縮寫 D. 運(yùn)行Java程序需要先安裝JDK 2. 下列說法中錯(cuò)誤的是 ( ) A. Java語言是編譯執(zhí)行的 B. Java中使用了多進(jìn)程技術(shù) C. Java的單行注視以//開頭 D. Java語言具有很高的安全性 3. 下面不屬于Java語言特點(diǎn)的一項(xiàng)是( ) A. 安全性 B. 分布式 C. 移植性 D. 編譯執(zhí)行 4. 下列語句中,正確的項(xiàng)是 ( ) A . int $e,a,b=10 B. char c,d=’a’ C. float e=0.0d D. double c=0.0f
上傳時(shí)間: 2017-01-04
上傳用戶:netwolf
In this paper we revisit hybrid analog-digital precoding systems with emphasis on their modelling and radio-frequency (RF) losses, to realistically evaluate their benefits in 5G system implementations. For this, we decompose the analog beamforming networks (ABFN) as a bank of commonly used RF components and formulate realistic model constraints based on their S-parameters. Specifically, we concentrate on fully-connected ABFN (FC-ABFN) and Butler networks for implementing the discrete Fourier transform (DFT) in the RF domain. The results presented in this paper reveal that the performance and energy efficiency of hybrid precoding systems are severely affected, once practical factors are considered in the overall design. In this context, we also show that Butler RF networks are capable of providing better performances than FC-ABFN for systems with a large number of RF chains.
標(biāo)簽: Analog-Digital Precoding Hybrid
上傳時(shí)間: 2020-05-27
上傳用戶:shancjb
Before delving into the details of orthogonal frequency division multiplexing (OFDM), relevant background material must be presented first. The purpose of this chapter is to provide the necessary building blocks for the development of OFDM principles. Included in this chapter are reviews of stochastic and random process, discrete-time signals and systems, and the Discrete Fourier Transform (DFT). Tooled with the necessary mathematical foundation, we proceed with an overview of digital communication systems and OFDM communication systems. We conclude the chapter with summaries of the OFDM wireless LAN standards currently in existence and a high-level comparison of single carrier systems versus OFDM.
上傳時(shí)間: 2020-05-31
上傳用戶:shancjb
DFT(Discrete Fourier Transformation)是數(shù)字信號(hào)分析與處理如圖形、語音及圖像等領(lǐng)域的重要變換工具,直接計(jì)算DFT的計(jì)算量與變換區(qū)間長度N的平方成正比.當(dāng)N較大時(shí),因計(jì)算量太大,直接用DFT算法進(jìn)行譜分析和喜好的實(shí)時(shí)處理是不切實(shí)際的.快速傅里葉變換(Fast Fourier Transformation,簡稱FFT)使DFT運(yùn)算效率提高1~2個(gè)數(shù)量級(jí).本文的目的就是研究如何應(yīng)用FPGA這種大規(guī)模可編程邏輯器件實(shí)現(xiàn)FFT的算法.本設(shè)計(jì)主要采用先進(jìn)的基-4DIT算法研制一個(gè)具有實(shí)用價(jià)值的FFT實(shí)時(shí)硬件處理器.在FFT實(shí)時(shí)硬件處理器的設(shè)計(jì)實(shí)現(xiàn)過程中,利用遞歸結(jié)構(gòu)以及成組浮點(diǎn)制運(yùn)算方式,解決了蝶形計(jì)算、數(shù)據(jù)傳輸和存儲(chǔ)操作協(xié)調(diào)一致問題.合理地解決了位增長問題.同時(shí),采用并行高密度乘法器和流水線(pipeline)工作方式,并將雙端口RAM、只讀ROM全部內(nèi)置在FPGA芯片內(nèi)部,使整個(gè)系統(tǒng)的數(shù)據(jù)交換和處理速度得以很大提高,實(shí)際合理地解決了資源和速度之間相互制約的問題.本設(shè)計(jì)采用Verilog HDL硬件描述語言進(jìn)行設(shè)計(jì),由于在設(shè)計(jì)中采用Xilinx公司提供的稱為Core的IP功能塊極大地提高了設(shè)計(jì)效率.
標(biāo)簽: FPGA FFT 數(shù)字處理器 硬件實(shí)現(xiàn)
上傳時(shí)間: 2013-06-20
上傳用戶:小碼農(nóng)lz
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