power modulation and coding control

... 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...

Ngày tải lên: 18/10/2013, 06:15

... 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, ... representing the encoder Lecture 10 Convolutional codes Convolutional codes offer an approach to error control coding substantially different from that of block codes A convolutional encoder: encodes the ... 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...

Ngày tải lên: 25/10/2013, 06:15

... 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...

Ngày tải lên: 25/10/2013, 06:15

... 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...

Ngày tải lên: 29/10/2013, 13:15

... 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...

Ngày tải lên: 29/10/2013, 13:15

... digital communication system (DCS): Utilized techniques Formatting and source coding Modulation (Baseband and bandpass signaling) Channel coding Equalization Synchronization Design goals Trade-offs ... signal is a power signal if, and only if, it has finite but nonzero power for all time: General rule: Periodic and random signals are power signals Signals that are both deterministic and non-periodic ... 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...

Ngày tải lên: 08/11/2013, 18:15

... quantization noise power Signal peak power Signal power to average quantization noise power Lecture Encoding (PCM) A uniform linear quantizer is called Pulse Code Modulation (PCM) Pulse code modulation ... comparing and selecting PCM waveforms: Spectral characteristics (power spectral density and bandwidth efficiency) Bit synchronization capability Error detection capability Interference and noise ... 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...

Ngày tải lên: 08/11/2013, 18:15

... 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 ... 0.75T ) Lecture 10 Receiver 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...

Ngày tải lên: 27/01/2014, 08:20

... 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 ... 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...

Ngày tải lên: 27/01/2014, 08:20

... signal power to the average noise power SNR should be modified in terms of bit-energy in DCS, because: Signals are transmitted within a symbol duration and hence, are energy signal (zero power) ... 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 ⎟ ... 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...

Ngày tải lên: 27/01/2014, 08:20

... noise power Signal peak power Signal power to average quantization noise power Lecture Encoding (PCM)   A uniform linear quantizer is called Pulse Code Modulation (PCM) Pulse code modulation ... comparing and selecting PCM waveforms:      Spectral characteristics (power spectral density and bandwidth efficiency) Bit synchronization capability Error detection capability Interference and ... 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...

Ngày tải lên: 23/03/2014, 10:21

... signal power to the average noise power SNR should be modified in terms of bit-energy in DCS, because:  Signals are transmitted within a symbol duration and hence, are energy signal (zero power) ... 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 ... 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...

Ngày tải lên: 23/03/2014, 10:21

... 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 ... the encoder Lecture 10 Convolutional codes  Convolutional codes offer an approach to error control coding substantially different from that of block codes  A convolutional encoder:     encodes ... 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...

Ngày tải lên: 30/03/2014, 10:20

... 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 ... definitions and concepts   Signals classification and linear systems Random processes and their statistics   WSS, cyclostationary and ergodic processes Autocorrelation and power spectral density  Power ... Average symbol and bit error probabilities Average symbol energy, symbol rate, bandwidth Comparison of modulation schemes in terms of error performance and bandwidth occupation (power and bandwidth)...

Ngày tải lên: 30/03/2014, 10:20

... 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...

Ngày tải lên: 21/06/2014, 02:20

... 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 ... The coding, interleaving, and symbol mapping are the same as defined in the WiMAX IEEE 802.16-2004 specification [5] Depending on the feedback information from the receiver, the mapping and the coding ... STC AMC information 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,...

Ngày tải lên: 22/06/2014, 06:20

... 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...

Ngày tải lên: 22/06/2014, 19:20

... 1.9 Review questions and problems Switching devices and control electrode requirements 2.1 Rating, safe operation area and power handling capability of devices 2.1.1 Power handling capability (PH) ... Harmonic properties 8.1.2 R.m.s voltage and current 8.1.3 Power and power factor 8.1.3.1 Average power 8.1.3.2 Power factor 8.1.3.3 Reactive voltamperes and power factor correction 8.1.4 Worked ... 8.2.5 Power and power factor 8.2.6 Worked examples 8.3 Resistive load with integral-cycle triggering 8.3.1 Harmonic and subharmonic properties 8.3.2 R.m.s voltage and current 8.3.3 Power and power...

Ngày tải lên: 29/04/2016, 09:46