dpcm delta modulation and adaptive dpcm g 721
3G, HSPA and FDD versus TDD networking smart antennas and adaptive modulation
... Multiplexing and Channel Coding 1.3.3.4 Spreading and Modulation 1.3.3.4.1 Downlink Spreading and Modulation 1.3.3.4.2 Uplink Spreading and Modulation 1.3.3.5 Random ... supporting variable rates and a range QoS are highlighted The UL and DL modulation and spreading schemes are described and UTRA and IMT 2000 are compared in terms of the various solutions standardized ... CDMA system Zhang, Tao, Wang and Li [48] 2005 The adaptive antenna array and adaptive modulationaided network performance of a UTRA FDD system was investigated Rummler, Chung and Aghvami [42] 2004...
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Báo cáo hóa học: " Research Article Experimental Evaluation of Adaptive Modulation and Coding in MIMO WiMAX with Limited " docx
... chose a channel bandwidth of MHz For this channel bandwidth, the WiMAX standard defines a sampling rate of Ts = 1/5.76 MHz The 5.76 MHz total signal bandwidth emerging from this sampling rate fits into ... coding At a fixed modulation and coding scheme, the Alamouti coded system therefore has an increasing SNR advantage for large SNR values However, since we are considering a coded system with adaptive ... G Matz, and F Hlawatsch, Adaptive identification and tracking of doubly selective fading channels for wireless MIMO-OFDM systems,” in Proceedings of the 4th IEEE Workshop on Signal Processing...
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Báo cáo hóa học: " Research Article Cross-Layer Design for Video Transmission over Wireless Rician Slow-Fading Channels Using an Adaptive Multiresolution Modulation and Coding Scheme" pptx
... coding and error control for internet streaming and multicast,” Eurasip Journal on Applied Signal Processing, vol 2003, no 1, pp 66–80, 2003 P G Sherwood, X Tian, and K Zeger, “Efficient image and ... degree in electrical power engineering from Tsinghua University, Beijing, in 1996, and M.S and Ph.D degrees in electrical engineering from Rensselaer Polytechnic Institute, Troy, NY, in 1999 and ... single user in the network Instead, the AMC-JSCC system can avoid such problems and achieve graceful quality adjustment through the use of adaptive coding and modulation according to prevailing...
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Báo cáo hóa học: " Research Article Description of a 2-Bit Adaptive Sigma-Delta Modulation System with Minimized Idle Tones" docx
... and G S Tombras, “A 2-bit adaptive delta modulation system with improved performance,” EURASIP Journal on Advances in Signal Processing, vol 2007, Article ID 16286, pages, 2007 [8] G S Tombras and ... “Time-quantized frequency modulation with time dispersive codes for the generation of sigma -delta modulation, ” in Proceedings of the 112th Audio Engineering Soceity Convention (AES ’02), Munich, Germany, May ... on Circuits and Systems (ISCAS ’92), vol 3, pp 1304–1307, San Diego, Calif, USA, May 1992 [3] X Sun and K R Laker, Adaptive integrator-output bounding (AIB) for second order sigma -delta ADC,”...
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Báo cáo hóa học: " Spectrally Efficient Communication over Time-Varying Frequency-Selective Mobile Channels: Variable-Size Burst Construction and Adaptive Modulation" pot
... (b) a larger burst of 400 data symbols For this scenario, the smaller burst approximates more accurately F M Bui and D Hatzinakos Training Data Guard interval G1 G2 = G3 G4 = G5 = G6 G7 = G8 H1 ... fundamental bursts to form larger accumulated bursts, while still satisfying the quasi-static assumption For example, if G2 = G3 , G4 = G5 = G6 , G7 = G8 (see Figure 3, e .g. , of how this may arise), ... Erceg, D Gesbert, and R W Heath, Adaptive modulation and MIMO coding for broadband wireless data networks,” IEEE Communications Magazine, vol 40, no 6, pp 108–115, 2002 [14] J G Proakis, Digital...
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Báo cáo hóa học: "Research Article A 2-bit Adaptive Delta Modulation System with Improved Performance" ppt
... adaptation algorithm can be used in order to enhance the dynamic range of other analog-to-digital conversion schemes and offer high SNR performance and robustness in tracking highly varying signals REFERENCES ... improve LDM and ADM performance, Ph.D thesis, University of Thessaloniki, Thessaloniki, Greece, 1988 [8] G S Tombras and C A Karybakas, “New adaptation algorithm for a two-digit adaptive delta modulation ... analog and digital circuits and systems, as well as instrumentation, measurements, and audio engineering Professor Tombras is the author of the textbook Introduction to Electronics (in Greek) and...
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Digital Communications I: Modulation and Coding Course
... W 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 are used by signaling ... Raised-Cosine filter Lecture Pulse shaping to reduce ISI Goals and trade-off in pulse-shaping Reduce ISI Efficient bandwidth utilization Robustness to timing error (small side lobes) Lecture The ... selective, slowly changing (slow fading) channel for a user at 35 km/h Lecture 21 Equalization: Channel examples … Example of a frequency selective, fast changing (fast fading) channel for a user...
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Modulation and coding course- lecture 10
... ( g1 ( X ) = g 01) + g1 (1) X + g 21) X = + X + X ( ( g ( X ) = g 02 ) + g1 ( ) X + g 22 ) X = + X The output sequence is found as follows: U( X ) = m( X )g1 ( X ) interlaced with m( X )g ( ... talked about: Channel coding Linear block codes The error detection and correction capability Encoding and decoding Hamming codes Cyclic codes Lecture 10 Today, we are going to talk about: Another ... element in each vector, is “1” if the i:th stage in the shift register is connected to the corresponding modulo2 adder, and “0” otherwise Example: g1 = (111) g = (101) u1 m u1 u u2 Lecture 10 11 Encoder...
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Modulation and coding course- lecture 9
... ⎥ ⎥ ⎥ L gr ⎥ g1 L g r ⎥ ⎦ g1 L g r g g1 L g r O O O O g0 g1 g0 Lecture 38 Cyclic block codes Systematic encoding algorithm for an (n,k) Cyclic code: m( X ) by X n − k Multiply the message polynomial ... bits message bits Lecture 40 Cyclic block codes Find the generator and parity check matrices, G and H, respectively g( X ) = + 1⋅ X + ⋅ X + 1⋅ X ⇒ ( g , g1 , g , g ) = (1101) ⎡1 ⎢0 G= ⎢ ⎢0 ⎢ ⎣0 ... g ( X ) with minimal degree r < n g ( X ) is called the generator polynomials g ( X ) = g + g1 X + + g r X r Every code polynomial U( X ) in C, can be expressed uniquely as U ( X ) = m( X )g...
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Modulation and coding course- lecture 12
... + − DL(1 + L) N One path with weight 5, length and data weight of One path with weight 6, length and data weight of One path with weight 5, length and data weight of Lecture 12 15 Systematic Convolutional ... denoted by d free or d f Lecture 12 11 Free distance … The path diverging and remerging to all-zero path with minimum weight Hamming weight of the branch All-zero path df =5 0 0 2 2 2 1 1 1 t1 t t t ... rate, increasing the constraint length, usually increases the free distance For a given constraint length, decreasing the coding rate, usually increases the free distance The coding gain is upper...
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Modulation and coding course- lecture 11
... levels Decoding based on soft-bits, is called the “soft-decision decoding” On AWGN channels, dB and on fading channels dB gain are obtained by using soft-decoding over hard-decoding Lecture 11 ... the encoder and different ways for representing it Lecture 11 Today, we are going to talk about: What are the state diagram and trellis representation of the code? How the decoding is performed ... z ji | u (jim ) ) and equivalently, the log-likelihood function becomes γ U (m) = log p(Z | U ∞ (m) Path metric ) = ∑ log p ( Z i | U i =1 ∞ (m) i Branch metric n ) = ∑∑ log p ( z ji | u (jim...
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Modulation and coding course- lecture 1
... non-periodic signal Analog and discrete signals A discrete signal Analog signals Lecture 14 Classification of signals Energy and power signals A signal is an energy signal if, and only if, it ... Learning fundamental issues in designing a digital communication system (DCS): Utilized techniques Formatting and source coding Modulation (Baseband and bandpass signaling) Channel coding Equalization ... bandpass: Baseband signal Bandpass signal Local oscillator Bandwidth dilemma: Bandlimited signals are not realizable! Realizable signals have infinite bandwidth! Lecture 24 Bandwidth of signal … Different...
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Modulation and coding course- lecture 2
... Lecture Aliasing effect LP filter Nyquist rate aliasing Lecture Sampling theorem Analog signal Sampling process Pulse amplitude modulated (PAM) signal Sampling theorem: A bandlimited signal with no ... 3.0 Normalized magnitude of speech signal ⎛S⎞ Using equal step sizes (uniform quantizer) gives low ⎜ N ⎟ for weak S ⎝ ⎠q signals and high ⎛ ⎞ for strong signals ⎜ ⎟ ⎝ N ⎠q Adjusting the step size ... digital communication systems Some basic concepts and definitions as signal classification, spectral density, random process, linear systems and signal bandwidth Lecture 2 Today, we are going...
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Tài liệu Tự điển Food Science, Technology And Nutrition - Vần G docx
... fibre g, ash 0.8 g, Ca 16 mg, Fe 0.6 mg, Mg 43 mg, P 34 mg, K 415 mg, Na 13 mg, Zn 0.3 mg, Cu 0.2 mg, Mn 0.2 mg, Se 0.7 g, E 0.3 mg, K 0.1 mg, B1 0.03 mg, B2 0.03 mg, niacin 0.8 mg, B6 0.16 mg, ... 10.2 g, fibre 4.3 g, ash 0.5 g, Ca 25 mg, Fe 0.3 mg, Mg 10 mg, P 27 mg, K 198 mg, Na mg, Zn 0.1 mg, Cu 0.1 mg, Mn 0.1 mg, Se 0.6 g, I g, vitamin A 15 g RE, E 0.4 mg, B1 0.04 mg, B2 0.03 mg, niacin ... 0.9 g, carbohydrate 14.3 g (8.9 g sugars), fibre 5.4 g, ash 1.4 g, Ca 18 mg, Fe 0.3 mg, Mg 22 mg, P 40 mg, K 417 mg, Na mg, Zn 0.2 mg, Cu 0.2 mg, Mn 0.2 mg, Se 0.6 g, vitamin A 31 g RE (5578 µg...
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Tài liệu Delta Modulation ppt
... leaving the actual signal virtually unaffected figure (a) Delta modulation figure (b) Delta modulation – block parameters of DPCM encode figure A – Delta Modulation The input signal is given ... input signal is given by figure (c) Delta modulation – input signal figure (d) Delta modulation quantization recovered signal figure (e) Delta modulation – input signal & output ... linearity and high tolerance to circuit imperfection The block diagram of a general sigma -delta modulator is shown below The sigma -delta modulator consists of a discrete time integrator, a quantizer and...
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Tài liệu Notes for an Introductory Course On Electrical Machines and Drives E.G.Strangas MSU Electrical ppt
... purposes of teaching the introductory course on Energy Conversion and Power Electronics at MSU E .G. STRANGAS E Lansing, Michigan and Pyrgos, Tinos ix A Note on Symbols Throughout this text an ... factor leading or lagging, depending on whether the current of the load leads or lags the voltage across it It is clear then that for an inductive/resistive load the power factor is lagging, while ... leading Also: S = VI = 120 /6 /4 = 579.6W j155.3V Ar (1.17) Figure 1.6 shows the phasors for lagging and leading power factors and the corresponding complex power S P S jQ jQ S P I V V I Fig 1.6...
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Tài liệu Modulation and coding course- lecture 3 pptx
... 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 ... job Demodulation and sampling: Waveform recovery and preparing the received signal for detection: Improving the signal power to the noise power (SNR) using matched filter Reducing ISI using equalizer ... (baseband signals) Pulse modulate Encode Encoding each q value to l = log L bits (Data bit duration Tb=Ts/l) Mapping every m = log M data bits to a symbol out of M symbols and transmitting a baseband...
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Tài liệu Modulation and coding course- lecture 4 pdf
... of AWGN and ISI on the transmitted signal Optimum filter to maximize SNR Matched filter receiver and Correlator receiver Lecture Receiver job Demodulation and sampling: Waveform recovery and preparing ... Waveform recovery and preparing the received signal for detection: Improving the signal power to the noise power (SNR) using matched filter Reducing ISI using equalizer Sampling the recovered waveform ... Lecture Signal space What is a signal space? Vector representations of signals in an N-dimensional orthogonal space Why we need a signal space? It is a means to convert signals to vectors and vice...
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