coding modulation and multiplexing
Digital Communications I: Modulation and Coding Course
... Nyquist 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 ... ≥ [symbol/s/Hz] 2T 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 ... noise and no ISI) Lecture 16 Example of eye pattern: Binary-PAM, SRRQ pulse … AWGN (Eb/N0=20 dB) and no ISI Lecture 17 Example of eye pattern: Binary-PAM, SRRQ pulse … AWGN (Eb/N0=10 dB) and no...
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Modulation and coding course- lecture 10
... Last time, we talked about: Channel coding Linear block codes The error detection and correction capability Encoding and decoding Hamming codes Cyclic codes Lecture 10 Today, ... k , K ) or (k / n, K ) where Rc = k / n is the coding rate, determining the number of data bits per coded bit In practice, usually k=1 is chosen and we assume that from now on K is the constraint ... (11 10 00 10 11) Effective code rate Initialize the memory before encoding the first bit (allzero) Clear out the memory after encoding the last bit (allzero) Hence, a tail of zero-bits is appended...
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Modulation and coding course- lecture 9
... detection and correction codes Lecture Why using error correction coding? Error performance vs bandwidth Power vs bandwidth P Data rate vs bandwidth Capacity vs bandwidth B Coded A F Coding gain: ... error detection and correction capability Encoding and decoding Hamming codes Cyclic codes Lecture Block diagram of a DCS Format Source encode Channel encode Pulse modulate Bandpass modulate ... Bandpass modulate Channel Digital modulation Digital demodulation Format Source decode Channel decode Lecture Detect Demod Sample What is channel coding? Channel coding: Transforming signals to...
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Modulation and coding course- lecture 12
... Lecture 12 Soft and hard decision decoding … ML soft-decisions decoding rule: Choose the path in the trellis with minimum Euclidean distance from the received sequence ML hard-decisions decoding rule: ... length, decreasing the coding rate, usually increases the free distance The coding gain is upper bounded coding gain ≤ 10 log10 ( Rc d f ) Lecture 12 22 Performance bounds … Basic coding gain (dB) ... code uses two levels on coding, an inner code and an outer code (higher rate) Popular concatenated codes: Convolutional codes with Viterbi decoding as the inner code and Reed-Solomon codes as...
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Modulation and coding course- lecture 11
... two 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 ... possible codewords: sequence and L codewords to search!!! ML decoding rule: Choose U ( m′) if p(Z | U ( m′) ) = max(m) p(Z | U ( m ) ) over all U Lecture 11 11 ML decoding for memory-less channels ... quantized only to two level) which are called “hardbits” Decoding based on hard-bits is called the “hard-decision decoding” Lecture 11 15 Soft and hard decision-cont’d In Soft decision: The demodulator...
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Modulation and coding course- lecture 1
... digital communication system (DCS): Utilized techniques Formatting and source coding Modulation (Baseband and bandpass signaling) Channel coding Equalization Synchronization Design goals Trade-offs ... Low-pass Band-pass High-pass Realizable filters: RC filters Butterworth filter Lecture 23 Bandwidth of signal Baseband versus bandpass: Baseband signal Bandpass signal Local oscillator Bandwidth ... Bandwidth dilemma: Bandlimited signals are not realizable! Realizable signals have infinite bandwidth! Lecture 24 Bandwidth of signal … Different definition of bandwidth: a) Half-power bandwidth b) Noise...
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Modulation and coding course- lecture 2
... Implementation cost and complexity Lecture 19 Spectra of PCM waveforms Lecture 20 M-ary pulse modulation M-ary pulse modulations category: M-ary pulse-amplitude modulation (PAM) M-ary pulse-position modulation ... average quantization noise power Lecture Encoding (PCM) A uniform linear quantizer is called Pulse Code Modulation (PCM) Pulse code modulation (PCM): Encoding the quantized signals into a digital ... comparing and selecting PCM waveforms: Spectral characteristics (power spectral density and bandwidth efficiency) Bit synchronization capability Error detection capability Interference and noise...
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Tài liệu Modulation and coding course- lecture 3 pptx
... Quantization Uniform and non-uniform Baseband modulation Binary pulse modulation M-ary pulse modulation M-PAM (M-ay Pulse amplitude modulation) Lecture Formatting and transmission of baseband signal Digital ... statistic) 12 ˆ mi 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 Equivalence ... Receiver structure Demodulation (and sampling) Detection First step for designing the receiver Matched filter receiver Correlator receiver Lecture Demodulation and detection g i (t ) Bandpass si (t...
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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 ... For bandpass signals Received waveform Receiving filter Equalizing filter ˆ mi Threshold comparison Compensation for channel induced ISI Baseband pulse (possibly distored) Lecture Baseband pulse ... we need a signal space? It is a means to convert signals to vectors and vice versa It is a means to calculate signals energy and Euclidean distances between signals Why are we interested in Euclidean...
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Tài liệu Modulation and coding course- lecture 5 doc
... time we talked about: Receiver structure Impact of AWGN and ISI on the transmitted signal Optimum filter to maximize SNR Matched filter and correlator receiver Signal space used for detection ... deterministic Elements of noise vector n = (n1 , n2 , , nN ) are i.i.d Gaussian random variables with zero-mean and variance N / The noise vector pdf is ⎛ n2⎞ ⎟ pn (n) = exp⎜ − (πN )N / ⎜ N ⎟ ... Signal space used for detection Orthogonal N-dimensional space Signal to waveform transformation and vice versa Lecture Today we are going to talk about: Signal detection in AWGN channels Minimum...
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Digital Communication I: Modulation and Coding Course-Lecture 2 potx
... communication systems Some basic concepts and definitions such as as signal classification, spectral density, random process, linear systems and signal bandwidth Lecture 2 Today, we are going to ... average quantization noise power Lecture Encoding (PCM) A uniform linear quantizer is called Pulse Code Modulation (PCM) Pulse code modulation (PCM): Encoding the quantized signals into a digital ... comparing and selecting PCM waveforms: Spectral characteristics (power spectral density and bandwidth efficiency) Bit synchronization capability Error detection capability Interference and...
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Digital Communication I: Modulation and Coding Course-Lecture 5 potx
... we talked about: Receiver structure Impact of AWGN and ISI on the transmitted signal Optimum filter to maximize SNR Matched filter and correlator receiver Signal space used for detection ... deterministic Elements of noise vector n = (n1 , n2 , , nN ) are i.i.d Gaussian random variables with zero-mean and variance N / The noise vector pdf is n2 pn (n) = exp − ( πN ) N / N ... Signal space used for detection Orthogonal N-dimensional space Signal to waveform transformation and vice versa Lecture Today we are going to talk about: Signal detection in AWGN channels Minimum...
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Digital Communication I: Modulation and Coding Course-Lecture 10 potx
... Last time, we talked about: Channel coding Linear block codes The error detection and correction capability Encoding and decoding Hamming codes Cyclic codes Lecture 10 ... or where (k / n, K ) (n, k , K ) is the coding rate, determining the number of data bits per coded bit RcIn=practice, usually k=1 is chosen and we assume that k/n from now on K is the constraint ... Lecture 10 Effective code rate Initialize the memory before encoding the first bit (allzero) Clear out the memory after encoding the last bit (allzero) Hence, a tail of zero-bits is appended...
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Digital Communication I: Modulation and Coding Course-Lecture 13 ppt
... Bandwidth efficient modulation schemes Offset QPSK (OQPSK) and Minimum shift keying M-QAM Bandwidth efficient and constant envelope modulations, suitable for non-linear amplifier Bandwidth ... formatting, coding, modulation Design goals: Probability of error and delay constraints Trade-off between parameters: Bandwidth and power limited systems Trading power with bandwidth and vise ... cont’d Channel coding Linear block codes (cyclic codes and Hamming codes) Encoding and decoding structure Generator and parity-check matrices (or polynomials), syndrome, standard array...
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báo cáo hóa học: " Optimal modulation and coding scheme allocation of scalable video multicast over IEEE 802.16e networks" docx
... modulation and coding; BS: base station; LT: lower bound of total utility; MCS: modulation and coding scheme; MSS: mobile subscriber station; SNR: signal-to-noise ratio; SVC: scalable video coding; ... and IEEE Microwave Theory and Techniques Society, IEEE Standard for Local and Metropolitan Area Networks Part 16: Air Interface for Fixed and Mobile Broadband Wireless Access Systems IEEE Standard ... and IEEE Microwave Theory and Techniques Society, IEEE Standard for Local and Metropolitan Area Networks Part 16: Air Interface for Fixed and Mobile Broadband Wireless Access Systems IEEE standard...
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Báo cáo hóa học: " Research Article Experimental Evaluation of Adaptive Modulation and Coding in MIMO WiMAX with Limited " docx
... space-time coding, and MIMO transmission with spatial multiplexing In the case of a single transmit antenna and for Alamouti mode, a single data stream is transmitted, while for spatial multiplexing, ... from receiver Figure 1: Encoding and modulation at the transmitter Table 1: The WiMAX AMC schemes in our setup for single antenna and Alamouti transmission For spatial multiplexing, a separate ... with adaptive modulation and coding, the operating points on the uncoded BER curves are between BER= 10−1 and BER= 10−2 At these large BER values, the SNR gain due to Alamouti coding is only...
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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
... adaptive multiresolution modulation and coding scheme which combines a multilayer video encoding and delivery scheme with an adaptive nonuniform phase-shift keyed (PSK) modulation /coding strategy The ... memory M = 10 and a corresponding puncturing period P = ADAPTIVE MULTIRESOLUTION MODULATION AND CODING SCHEME A block diagram of the proposed adaptive multiresolution modulation /coding (AMC) system ... channel coding rate vector (1) (2) Rc = (Rc , Rc ) for a specified class of channel codes Y Pei and J W Modestino Source coding Input video Base coder Channel coding (1) (Rs ) Base layer Modulation...
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C# Coding Standards and Best Programming Practices
... http://www.dotnetspider.com/tutorials/BestPractices.aspx To develop reliable and maintainable applications, you must follow coding standards and best practices The naming conventions, coding standards and best practices described in this ... maintainable, you (and your company) will be spending lot of time to identify issues, trying to understand code etc throughout the life of your application Purpose of coding standards and best practices ... License, Copyrights and Disclaimer Revision History Introduction Purpose of coding standards and best practices How to follow the standards across the...
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