This book presents, in a unitary and novel perspective, some of the research work the authors have carried out over the last decade, along with several collaborators and students. The roots of this book can be traced back to the design of adaptive sequence detectiOn algorithms for channels with parametric uncertainty. The explosion of turbo codes and iterative decoding around the middle of the Nineties has motivated the design of iterative (turbo and graph-based) detectiOn algorithms.
標(biāo)簽： Communications Algorithms detectiOn Wireless for
上傳時(shí)間： 2020-05-27
上傳用戶：shancjb
In order to improve the spectral efficiency in wireless communications, multiple antennas are employed at both transmitter and receiver sides, where the resulting system is referred to as the multiple-input multiple-output (MIMO) system. In MIMO systems, it is usually requiredto detect signals jointly as multiple signals are transmitted through multiple signal paths between the transmitter and the receiver. This joint detectiOn becomes the MIMO detectiOn.
標(biāo)簽： Complexity detectiOn MIMO Low
上傳時(shí)間： 2020-05-27
上傳用戶：shancjb
對(duì)圖片中的人臉進(jìn)行檢測(cè)和標(biāo)注，是用MATLAB來實(shí)現(xiàn)的-pictures of the human face detectiOn and tagging is used to achieve the
標(biāo)簽： face-opencv-test
上傳時(shí)間： 2013-04-24
上傳用戶：hxy200501
1.an fpga implementation of the image space reconstruction algorithm for hyperspectral imaging analysis\r\n2. fpga implemention of a median filter\r\n3. fpga implementation of digital filters\r\n4.hardware acceleration of edge detectiOn algorithm on fpgas
標(biāo)簽： implementation reconstruction hyperspectral algorithm
上傳時(shí)間： 2013-08-07
上傳用戶：ytulpx
微弱信號(hào)檢測(cè)裝置 四川理工學(xué)院 劉鵬飛、梁天德、曾學(xué)明 摘要： 本設(shè)計(jì)以TI的Launch Pad為核心板，采用鎖相放大技術(shù)設(shè)計(jì)并制作了一套微弱信號(hào)檢測(cè)裝置，用以檢測(cè)在強(qiáng)噪聲背景下已知頻率微弱正弦波信號(hào)的幅度值，并在液晶屏上數(shù)字顯示出所測(cè)信號(hào)相應(yīng)的幅度值。實(shí)驗(yàn)結(jié)果顯示其抗干擾能力強(qiáng)，測(cè)量精度高。 關(guān)鍵詞：強(qiáng)噪聲；微弱信號(hào)；鎖相放大；Launch Pad Abstract: This design is based on the Launch Pad of TI core board, using a lock-in amplifier technique designed and produced a weak signal detectiOn device, to measure the known frequency sine wave signal amplitude values of the weak in the high noise background, and shows the measured signal amplitude of the corresponding value in the liquid crystal screen. Test results showed that it has high accuracy and strong anti-jamming capability. Keywords: weak signal detectiOn; lock-in-amplifier; Launch Pad 1、引言 隨著現(xiàn)代科學(xué)技術(shù)的發(fā)展，在科研與生產(chǎn)過程中人們?cè)絹碓叫枰獜膹?fù)雜高強(qiáng)度的噪聲中檢測(cè)出有用的微弱信號(hào)，因此對(duì)微弱信號(hào)的檢測(cè)成為當(dāng)前科研的熱點(diǎn)。微弱信號(hào)并不意味著信號(hào)幅度小，而是指被噪聲淹沒的信號(hào)，“微弱”也僅是相對(duì)于噪聲而言的。只有在有效抑制噪聲的條件下有選擇的放大微弱信號(hào)的幅度，才能提取出有用信號(hào)。微弱信號(hào)檢測(cè)技術(shù)的應(yīng)用相當(dāng)廣泛，在生物醫(yī)學(xué)、光學(xué)、電學(xué)、材料科學(xué)等相關(guān)領(lǐng)域顯得愈發(fā)重要。 2、方案論證 針對(duì)微弱信號(hào)的檢測(cè)的方法有很多，比如濾波法、取樣積分器、鎖相放大器等。下面就針對(duì)這幾種方法做一簡(jiǎn)要說明。 方案一：濾波法。 在大部分的檢測(cè)儀器中都要用到濾波方法對(duì)模擬信號(hào)進(jìn)行一定的處理，例如隔離直流分量，改善信號(hào)波形，防止離散化時(shí)的波形混疊，克服噪聲的不利影響，提高信噪比等。常用的噪聲濾波器有：帶通、帶阻、高通、低通等。但是濾波方法檢測(cè)信號(hào)不能用于信號(hào)頻譜與噪聲頻譜重疊的情況，有其局限性。雖然可以對(duì)濾波器的通頻帶進(jìn)行調(diào)節(jié)，但其噪聲抑制能力有限，同時(shí)其準(zhǔn)確性與穩(wěn)定性將大打折扣。
標(biāo)簽： 2012 TI 電子設(shè)計(jì)大賽 微弱信號(hào)
上傳時(shí)間： 2013-11-04
上傳用戶：lty6899826
分析了調(diào)幅信號(hào)和載波信號(hào)之間的相位差與調(diào)制信號(hào)的極性的對(duì)應(yīng)關(guān)系,得出了相敏檢波電路輸出電壓的極性與調(diào)制信號(hào)的極性有對(duì)應(yīng)關(guān)系的結(jié)論。為了驗(yàn)證相敏檢波電路的這一特性,給出3 個(gè)電路方案,分別選用理想元件和實(shí)際元件,采用Multisim 對(duì)其進(jìn)行仿真實(shí)驗(yàn),直觀形象地演示了相敏檢波電路的鑒相特性,是傳統(tǒng)的實(shí)際操作實(shí)驗(yàn)所不可比擬的。關(guān)鍵詞:相敏檢波;鑒相特性;Multisim;電路仿真 Abstract : The corresponding relation between modulation signal polarity and difference phases of amplitudemodulated signal and the carrier signal ,the polarity of phase2sensitive detecting circuit output voltage and the polarity of modulation signal are correspondent . In order to verify this characteristic ,three elect ric circuit s plans are produced ,idea element s and actual element s are selected respectively. Using Multisim to carry on a simulation experiment ,and then demonst rating the phase detecting characteristic of the phase sensitive circuit vividly and directly. Which is t raditional practical experience cannot be com pared.Keywords :phase sensitive detectiOn ;phase2detecting characteristic ;Multisim;circuit simulation
上傳時(shí)間： 2013-11-23
上傳用戶：guanhuihong
Power over Ethernet (PoE) is a new development thatallows for the delivery of power to Ethernet-based devicesvia standard Ethernet CAT5 cable, precluding the need forwall adapters or other external power sources. The PoEspecification defines a hardware detectiOn protocol wherePower Sourcing Equipment (PSE) is able to identify PoEPowered Devices (PDs), thus allowing full backwardscompatibility with non-PoE-aware (legacy) Ethernetdevices.
標(biāo)簽： PoE 電池電路 擴(kuò)展 以太網(wǎng)供電
上傳時(shí)間： 2013-11-11
上傳用戶：daoyue
鎖定放大是微弱信號(hào)檢測(cè)的重要手段。基于相關(guān)檢測(cè)理論，利用開關(guān)電容的開關(guān)實(shí)現(xiàn)鎖定放大器中乘法器的功能，提出開關(guān)電容和積分器相結(jié)合以實(shí)現(xiàn)相關(guān)檢測(cè)的方法，并設(shè)計(jì)出一種鎖定放大器。該鎖定放大器將微弱信號(hào)轉(zhuǎn)化為與之相關(guān)的方波，通過后續(xù)電路得到正比于被測(cè)信號(hào)的直流電平，為后續(xù)采集處理提供方便。測(cè)量數(shù)據(jù)表明鎖定放大器前級(jí)可將10-6 A的電流轉(zhuǎn)換為10-1 V的電壓，后級(jí)通過帶通濾波器級(jí)聯(lián)可將信號(hào)放大1×105倍。該方法在降低噪聲的同時(shí)，可對(duì)微弱信號(hào)進(jìn)行放大，線性度較高、穩(wěn)定性較好。 Abstract: Lock-in Amplifying（LIA）is one of important means for weak signal detectiOn. Based on cross-correlation detectiOn theory， switch in the swithched capacitor was used as multiplier of LIA， and a new method of correlation detectiOn was proposed combining swithched capacitor with integrator. A kind of LIA was designed which can convert the weak signal to square-wave， then DC proportional to measured signal was obtained through follow-up conditioning circuit， providing convenience for signal acquisition and processing. The measured data shows that the electric current（10-6 A） can be changed into voltage（10-1 V） by LIA， and the signal is magnified 1×105 times by cascade band-pass filter. The noise is suppressed and the weak signal is amplified. It has the advantages of good linearity and stability.
標(biāo)簽： 開關(guān)電容 鎖定放大器
上傳時(shí)間： 2013-11-29
上傳用戶：黑漆漆
為了提高傳統(tǒng)溫度控制系統(tǒng)的性能，將PID控制理論與嵌入式系統(tǒng)相結(jié)合，采用瑞薩電子公司的H8S/2166作為核心處理器，AD公司的AD7705以及熱敏電阻溫度傳感器作為溫度檢測(cè)單元，利用4×6小鍵盤、LCD顯示器和S1D13305液晶控制器達(dá)到良好的人機(jī)交互，設(shè)計(jì)出了一個(gè)應(yīng)用于化工領(lǐng)域的嵌入式實(shí)時(shí)溫度控制系統(tǒng)。相比于傳統(tǒng)溫度控制系統(tǒng)，該系統(tǒng)提供了更強(qiáng)的計(jì)算能力和可擴(kuò)展能力，采用增量PID控制算法實(shí)現(xiàn)復(fù)雜控制。通過實(shí)驗(yàn)，該系統(tǒng)能達(dá)到0.1 ℃的溫度控制精度以及小于120 s的溫度穩(wěn)定時(shí)間。 Abstract: In order to improve the performance of conventional temperature control system， combining PID control theory with embedded systems， using the Renesas Electronics Corp. H8S/2166 micro-controller as a core processors， AD7705 and thermistor temperature sensor as a temperature detectiOn unit and 4×6 small keyboard， LCD and S1D13305 LCD controller as a good human-computer interaction， this paper designed an embedded real-time temperature control system which is applied in chemical industry. Compared with conventional temperature control system， this system provides more computing power and extensibility， and adopts PID control algorithm for complex control. Through the experiment， the system can reach temperature control accuracy of 0.1 ℃ and temperature stabilization time of less than 120 seconds.
標(biāo)簽： 瑞薩電子 微控制器 溫度控制 系統(tǒng)設(shè)計(jì)
上傳時(shí)間： 2014-12-26
上傳用戶：003030
針對(duì)盤山路存在的轉(zhuǎn)彎盲區(qū)，即在轉(zhuǎn)彎時(shí)司機(jī)無法得知彎路對(duì)面是否有車輛通過，設(shè)計(jì)一種基于C8051F310的山路轉(zhuǎn)彎預(yù)防警示系統(tǒng)。該系統(tǒng)利用一階濾波算法檢測(cè)山路轉(zhuǎn)彎時(shí)是否有車輛通過。運(yùn)用該算法可增強(qiáng)系統(tǒng)檢測(cè)的實(shí)時(shí)性，提高檢測(cè)機(jī)動(dòng)車輛的靈敏度，同時(shí)大大減少環(huán)境溫度對(duì)檢測(cè)的干擾。試驗(yàn)表明該系統(tǒng)能夠正確指示出在山路轉(zhuǎn)彎時(shí)是否有車輛通過，目前該系統(tǒng)已安裝在盤山路上，可大大減少事故的發(fā)生率。 Abstract: Aiming at passing hilly road，there is a turn blind spot.Motormen usually do not know if the passing of vehicles pass the road.So a system of defending accident on hilly road is designed,which is based on MCU C8051F310.The sys-tem uses the first-order filter algorithm to detect whether there are passing vehicles.This algorithm enhances the real-time detectiOn and improves the sensitivity of detectiOn vehicles.Meanwhile,it reduces the detectiOn interference of environmen-tal temperature.The experimental results show that this system can exactly indicate if there are passing vehicles.At present,the system has been successfully applied to hilly road.The system can greatly decrease accident.
上傳時(shí)間： 2013-10-10
上傳用戶：歸海惜雪
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