communication and arts course

Ngày tải lên: 23/03/2014, 10:21

Ngày tải lên: 23/03/2014, 10:21

Ngày tải lên: 30/03/2014, 10:20

Ngày tải lên: 30/03/2014, 10:20

... bandwidth constraint  Nyquist bandwidth constraint:  The theoretical minimum required system bandwidth to detect Rs [symbols/s] without ISI is Rs/2 [Hz].  Equivalently, a system with bandwidth ... filter Equalizing filter Threshold comparison For bandpass signals Compensation for channel induced ISI Baseband pulse (possibly distored) Sample (test statistic) Baseband pulse Received waveform Step 1 – ... [symbols/s] without ISI.  Bandwidth efficiency, R/W [bits/s/Hz] :  An important measure in DCs representing data throughput per hertz of bandwidth.  Showing how efficiently the bandwidth resources...

Ngày tải lên: 18/10/2013, 06:15

... techniques.  Convolutional codes are based on construction techniques. Digital Communications I: Modulation and Coding Course Period 3 - 2007 Catharina Logothetis Lecture 10 Lecture 10 7 A Rate ½ ... truncation ).  is a machine with memory.  This fundamental difference in approach imparts a different nature to the design and evaluation of the code.  Block codes are based on algebraic/combinatorial ... we talked about:  Channel coding  Linear block codes  The error detection and correction capability  Encoding and decoding  Hamming codes  Cyclic codes Lecture 10 11 Encoder representation  Vector...

Ngày tải lên: 25/10/2013, 06:15

... 7 Why using error correction coding?  Error performance vs. bandwidth  Power vs. bandwidth  Data rate vs. bandwidth  Capacity vs. bandwidth (dB) / 0 NE b B P A F B D C E Uncoded Coded Coding ... received polynomial by the generator polynomial.  With syndrome and Standard array, error is estimated.  In Cyclic codes, the size of standard array is considerably reduced. )()()( XXX eUr += Received ... detection and correction codes Lecture 9 28 Linear block codes – cont’d  Standard array  For row , find a vector in of minimum weight which is not already listed in the array.  Call this pattern and...

Ngày tải lên: 25/10/2013, 06:15

Ngày tải lên: 26/10/2013, 16:43

... NLDNLDNLD NLDL NLD NLDT One path with weight 5, length 3 and data weight of 1 One path with weight 6, length 4 and data weight of 2 One path with weight 5, length 5 and data weight of 2 Lecture 12 7 The Viterbi ... provides the decoder with a measure of confidence for the decision. Digital Communications I: Modulation and Coding Course Period 3 - 2007 Catharina Logothetis Lecture 12 ... between each of the codewords and the all-zero codeword.  This is the minimum distance in the set of all arbitrary long paths along the trellis that diverge and remerge to the all-zero path.  It...

Ngày tải lên: 29/10/2013, 13:15

... up:  For a data block of L bits, form the trellis. The trellis has L+K-1 sections or levels and starts at time and ends up at time .  Label all the branches in the trellis with their corresponding ... metric 1/3 -4/3 5/3 5/3 -5/3 Lecture 11 15 Soft and hard decisions  In hard decision:  The demodulator makes a firm or hard decision whether one or zero is transmitted and provides no other information ... metric entering each state at time . Keep the survivor path and delete the dead paths from the trellis. 1. If , increase by 1 and return to step 2. A. Start at state zero at time . Follow...

Ngày tải lên: 29/10/2013, 13:15

... User Lecture 1 25 Bandwidth of signal …  Different definition of bandwidth: a) Half-power bandwidth b) Noise equivalent bandwidth c) Null-to-null bandwidth a) Fractional power containment bandwidth b) ... ergodic in mean and autocorrelation, if and , respectively. Lecture 1 7 Practical information  Course material  Course text book:  “Digital communications: Fundamentals and Applications” ... 6 Scope of the course …  Learning fundamental issues in designing a digital communication system (DCS):  Utilized techniques  Formatting and source coding  Modulation (Baseband and bandpass signaling)  Channel...

Ngày tải lên: 08/11/2013, 18:15

... features of digital communication systems  Some basic concepts and definitions as signal classification, spectral density, random process, linear systems and signal bandwidth. Lecture 2 7 Aliasing ... comparing and selecting PCM waveforms:  Spectral characteristics (power spectral density and bandwidth efficiency)  Bit synchronization capability  Error detection capability  Interference and ... variance: 2 Sat 2 Lin 222 )()(})]({[ σσσ +==−= ∫ ∞ ∞− dxxpxexqx q E ll L l l qxp q )( 12 2 12/ 0 2 2 Lin ∑ − = = σ Uniform q. 12 2 2 Lin q = σ Digital Communications I: Modulation and Coding Course Period 3 – 200/ Catharina Logothetis Lecture 2 Lecture 2 18 PCM waveforms  PCM...

Ngày tải lên: 08/11/2013, 18:15

... and highlight the Definition elements. This command can be used to intersect with 3D-wireframe geometry, Solids and Surfaces. Selected elements Sketch elements AIRBUS UK CATIA V5 Foundation Course DMS42188 ... not active a new part will be activated and you will be prompted to enter a part name by following panel on the desktop. Enter a name and click on OK and a new CATPart will open. Note: If the ... the Tangent Arc icon and click to indicate the end of the arc. 2. Click and dragging the mouse pointer in the direction you wish the arc to appear, then release the button and the sketch tool...

Ngày tải lên: 17/12/2013, 11:15

... modulation Lecture 3 13 Baseband and bandpass  Bandpass model of detection process is equivalent to baseband model because:  The received bandpass waveform is first transformed to a baseband waveform.  ... Performing bandpass linear signal processing followed by heterodying the signal to the baseband, yields the same results as heterodying the bandpass signal to the baseband , followed by a baseband ... Gaussian random process (Gaussian Noise)  Inter-Symbol Interference (ISI)  Due to the filtering effect of transmitter, channel and receiver, symbols are “smeared”. Format Pulse modulate Bandpass modulate Format...

Ngày tải lên: 27/01/2014, 08:20

... tTstrz i i −∗= ∗ Mi , ,1 = ), ,,())(), ,(),(( 2121 MM zzzTzTzTz = =z Digital Communications I: Modulation and Coding Course Period 3 - 2007 Catharina Logothetis Lecture 4 Lecture 4 11 Signal space ... filter Equalizing filter Threshold comparison For bandpass signals Compensation for channel induced ISI Baseband pulse (possibly distored) Sample (test statistic) Baseband pulse Received waveform Step 1 – ... A 0 1 s 2 s T A T A− 0 0 Tt )( 1 t ψ T 1 0 0)()()()( )()()(),( /)(/)()( )( 122 0 1212 1111 0 2 2 11 =−−= −=>=< == == ∫ ∫ tAtstd Adtttstts AtsEtst AdttsE T T ψ ψψ ψ 1 2 Lecture 4 3 Receiver job  Demodulation and sampling:  Waveform recovery and preparing the received signal for detection:  Improving the signal power...

Ngày tải lên: 27/01/2014, 08:20

... PAM T t )( 1 t ψ T 1 0 Digital Communications I: Modulation and Coding Course Period 3 - 2007 Catharina Logothetis Lecture 5 Lecture 5 20 Eb/No figure of merit in digital communications  SNR or S/N ... noise vector are i.i.d Gaussian random variables with zero-mean and variance . The noise vector pdf is  The elements of observed vector are independent Gaussian random variables. Its pdf is ), ... liesPr()( )(1)( icie mPmP − = i m i s z i Z sent) and ˆ Pr()( iiie mmmmP ≠ = Lecture 5 16 Union bound  Let denote that the observation vector is closer to the symbol vector than , when is transmitted.  depends only on and .  Applying...

Ngày tải lên: 27/01/2014, 08:20

... The economic and social context for sustainability communications 1. CSR and communication : regulation, controls and voluntary initiatives a) Definitions: legalistic and voluntaristic ... marketing, advertising and communication actors. It should provide an understanding of the context and practices leading companies and public institutions to use sustainability communications as ... bibliography on Communications and sustainable development 39 c) Specific constraints for communication and marketing: ethical and operational principles Legal constraints on communication, ...

Ngày tải lên: 18/02/2014, 07:20

... algebra, calculus and statistics: simple and compound interest, inflation and taxes; annuities and pensions; amortisation and mortgages; insurance; credit cards; stocks, bonds and risk. Prequisites: ... ECONOMICS AND FINANCE 4 THE DEPARTMENT 5 LOCATION AND CONTACT DETAILS OF THE DEPARTMENT OF ECONOMICS AND FINANCE 5 Where is the Department of Economics and Finance? 5 Where do I get help with course ... is in two parts: Part I: Eight courses or equivalent from FINC 600-level courses. This is equivalent to the honours year. Courses from other subjects may be substituted for FINC courses where...

Ngày tải lên: 08/03/2014, 04:22

... be recognised and influenced. This need to understand the surrounding context applies to communication theory and method as much as it applies to the communities and people that communication ... collapsing telecommunications infrastructures can utilise cell phones, microwave and satellite technologies, to upgrade and more affordably replace old systems, and provide phone and Internet service ... connectivity access and high costs; a scarcity of skilled ICT labour; and a lack of local content creation and applications (lan- guage and software) hinder ICT appropriation by poor nations and by poor...

Ngày tải lên: 08/03/2014, 14:20