QPSK MODULATION TECHNIQUE

CHAPTER NINEModulation and Demodulation9.1 INTRODUCTIONModulation is a technique of imposing information (analog or digital) contained in alower frequency signal onto a higher frequency signal. The lower frequency is calledthe modulating signal, the higher frequency signal is called the carri[r]

x(t) )(X )()(Ktk Chương 2: Điều chế tương tự 4) Trong điều chế xung – số thì tần số lấy mẫu fmẫu max2F Phân loại điều chế: + Điều chế tương tự: AM, FM, PM, SSB, DSB. + Điều chế số: ASK, FSK, PSK, QPSK,… + Điều chế xung: PAM (Pulse Amplitude Modulation) PWM (Pulse Width Modulation)[r]

cast, amateur, and citizen band signal sources. Additionally, impulse noise also plays a significant rolein affecting the digital transmission performance of a system. Any transmission scheme that is to operate in this environment will need to have a multi-tieredapproach to combating the detrimental[r]

3.3 SummaryThe previous two sections have laid the ground work for the consideration of spread spectrumcommunication systems with discussions of the basic idea of a direct sequence spread spectrumsystem and some of its features, a review of basic digital modulation techniques and, in ad-ditio[r]

[79] G. Venkataramanan and D. M. Divan, “Improved performance voltageand current regulators using discrete pulse modulation,” in Conf. Rec.IEEE PESC’92, Toledo, Spain, 1992, pp. 601–606.[80] G. Venkataramanan, D. M. Divan, and T. M. Jahns, “Discrete pulsemodulation stategies for high frequenc[r]

Lam. The projects are located in areas belonging to different topography types. Table 1 lists the short description of these projects. Since the Thai Nguyen project is relatively large and covers three types of topography, it was divided into three subprojects: Plain Thai Nguyen, Hilly Thai Nguyen,[r]

c-Cbl, SLP-76, WASp and Nck [48,51]. The recruit-ment of LAT to the sites of TCR and ZAP-70 cluster-ing occurred within 30 s of the T cell–coverslip contact,and these clusters were reported dissipate within 150 sof T-cell activation [48]. Thus, these clusters containdynamic multiprotein signaling co[r]

EURASIP Journal on Applied Signal Processing 2004:16, 2492–2502c 2004 Hindawi Publishing CorporationSpeckle Reduction and Structure Enhancementby Multichannel Median BoostedAnisotropic DiffusionZhi YangDepartment of Electrical & Computer Engineering, University of Connecticut, Storrs, CT 06[r]

planning technique for planning technique for organizations.organizations.© 2007 Prentice Hall, Inc. All rights reserved. 9–14Exhibit 9–3Exhibit 9–3Types of BudgetsTypes of BudgetsSource: Based on R.S. Russell and B.W. Taylor III. Production and Operations Management (Upper Saddle Rive[r]

C06 11/25/2010 18:17:22 Page 88when using random sampling, it is possible to unintentionally exclude poten-tially critical transactions. The internal audit departments that use randomsampling are willing to take and accept a certain level of risk. This risk is relatedto the possibility that an incor[r]

Watercolor Technique Washes The most basic watercolor technique is the flat wash. It is produced by first wetting the area of paper to be covered by the wash, then mixing sufficient pigment to easily fill the entire area. The pigment is applied to a sloping surface in slightly over[r]

KỸ THUẬT ĐÀM PHÁN (NEGOTIATION TECHNIQUE) Giảng viên: Ths. Huỳnh Quốc Tuấn Email: hqtuan87@yahoo.com SĐT: 01223.571.545 1 2 CHƢƠNG I NHỮNG VẤN ĐỀ LÝ LUẬN CƠ BẢN VỀ ĐÀM PHÁN TRONG KINH DOANH Giúp ngƣời học hiểu đƣợc 1. Khái niệm về đàm phán 2. Bản chất của đàm phán 3. Đặc điểm[r]

LUYEN IELTS READING 2016 NGOC BACH PHƯƠNG PHÁP KEYWORD
KEYWORD TECHNIQUE FOR READING
LUYEN IELTS READING 2016 NGOC BACH PHƯƠNG PHÁP KEYWORD
KEYWORD TECHNIQUE FOR READING
LUYEN IELTS READING 2016 NGOC BACH PHƯƠNG PHÁP KEYWORD
KEYWORD TECHNIQUE FOR READING
LUYEN IELTS READING 2016 NGOC BACH PHƯƠNG PHÁ[r]

1. selectlargervaluebetween30dBcand 20dBm2. minimumlimitvaluel ForGSM850andGSM9001. selectlargervaluebetween59dBcand 54dBm中2. forDCS1800andPCS1900：selectlargervaluebetween48dBcand48dBm3. power/timeenvelopframeworkunderultratestconditionisasf[r]

Phase of the carrier is varied to represent binary 1 or 0.Phase of 0 degrees to represent binary 0.Phase to 180 degrees to send binary 1.Conceptual view of PSKPSK Constellation 4PSK- Conceptual view4-PSK Constellation diagram8 PSKWhen we have eight possible phases ,we can send three bits at a tim[r]

on its own.InquiryBy definition, inquiry is the process by which client data and supportinginformation are tested using a question format or standard questionnaire.This testing technique is used most often by companies that have multiplelocations that are created, operated, and managed under t[r]

6. Harvesting Harvest when litchi are ripe to ensure quality (harvesting when litchi colour is from 2/3 to total red). Pick fruit in the morning when there is no rain. Arrange fruit in thin layers in a cool place then pack in boxes or baskets to transport to markets. 7. Some other typical technique[r]

Pulse position modulation (PPM)–Pulse amplitude modulation (PAM)•We will only be considering PAM in these lectures PAM•PAM is a general signalling technique whereby pulse amplitude is used to convey the message•For example, the PAM pulses could be the sampled amplitude values of[r]

D1uF1k+10VD1uF1k+10VĐIỀU BIÊN (AM: Amplitude modulation)I. Phổ của tín hiệu điều biên:Điều biên là quá trình làm cho biên độ tải tin biến đổi theo tin tức.Giả thiết tin tức là tín hiệu âm tần có phạm vi biến đổi tần số từ Ωmin÷Ωmax, ta có:VΩ = VΩ.cosΩt (1.1)Tải tin là dao động cao tần:Vωo = V[r]