| Digital Communications (Digitale Nachrichtenübertragung) (M.Sc.) |
| Untertitel: |
| This course is part of the module: Digital Communications |
| Semester: |
| WiSe 23/24 |
| Veranstaltungstyp: |
| Vorlesung (Lehre) |
| Veranstaltungsnummer: |
| lv444_w23 |
| DozentIn: |
| Gerhard Bauch, M. Sc Leonard Paul Schulz, PD Dr.-Ing. habil. Rainer Grünheid, David Jonas Kopyto |
| Beschreibung: |
- Repetition: Baseband Transmission
- Pulseshaping: Non-return to zero (NRZ) rectangular pulses, raised-cosine pulses,square-root raised-cosine pulses
- Powerspectral density (psd) of baseband signals
- Intersymbolinterference (ISI)
- Firstand second Nyquist criterion
- AWGNchannel
- Matchedfilter
- Matched-filterreceiver and correlation receiver
- Noisewhitening matched filter
- Discrete-timeAWGN channel model
- Representationof bandpass signals and systems in the equivalent baseband
- Quadratureamplitude modulation (QAM)
- Equivalentbaseband signal and system
- Analyticalsignal
- Equivalentbaseband random process, equivalent baseband white Gaussian noise process
- Equivalentbaseband AWGN channel
- Equivalentbaseband channel model with frequency-offset and phase noise
- Equivalentbaseband Rayleigh fading and Rice fading channel models
- Equivalentbaseband frequency-selective channel model
- Discretememoryless channels (DMC)
- Bandpasstransmission via carrier modulation
- Amplitudemodulation, frequency modulation, phase modulation
- Lineardigital modulation methods
- On-offkeying, M-ary amplitude shift keying (M-ASK), M-ary phase shift keying (M-PSK),M-ary quadrature amplitude modulation (M-QAM), offset-QPSK
- Signalspace representation of transmit signal constellations and signals
- Energyof linear digital modulated signals, average energy per symbol
- Powerspectral density of linear digital modulated signals
- Bandwidthefficiency
- Correlationcoefficient of elementary signals
- Errorprobabilities of linear digital modulation methods
- Error functions
- Graymapping and natural mapping
- Biterror probabilities, symbol error probabilities, pairwise symbol errorprobabilities
- Euclideandistance and Hamming distance
- Exactand approximate computation of error probabilities
- Performancecomparison of modulation schemes in terms of per bit SNR vs. per symbol SNR
- Hierarchicalmodulation, multilevel modulation
- Effectsof carrier phase offset and carrier frequency offset
- Differentialmodulation
- M-arydifferential phase shift keying (M-PSK)
- Coherentand non-coherent detection of DPSK
- p/M-differential phaseshift keying (p/M-DPSK)
- Differentialamplitude and phase shift keying (DAPSK)
- Non-lineardigital modulation methods
- Frequencyshift keying (FSK)
- Modulationindex
- Minimumshift keying (MSK)
- Offset-QPSKrepresentation of MSK
- MSKwith differential precoding and rotation
- Biterror probabilities of MSK
- Gaussianminimum shift keying (GMSK)
- Powerspectral density of MSK and GMSK
- Continuousphase modulation (CPM)
- Generaldescription of CPM signals
- Frequencypulses and phase pulses
- Coherentand non-coherent detection of FSK
- Performancecomparison of linear and non-linear digital modulation methods
- Frequency-selectivechannels, ISI channels
- Intersymbolinterference and frequency-selectivity
- RMSdelay spread
- Narrowbandand broadband channels
- Equivalentbaseband transmission model for frequency-selective channels
- Receivefilter design
- Equalization
- Symbol-spacedand fractionally-spaced equalizers
- Inversesystem
- Non-recursivelinear equalizers
- Linearzero-forcing (ZF) equalizer
- Linearminimum mean squared error (MMSE) equalizer
- Non-linearequalization:
- Decisionfeedback equalizer (DFE)
- Tomlinson-Harashimaprecoding
- Maximuma posteriori probability (MAP) and maximum likelihood equalizer, Viterbialgorithm
- Single-carriervs. multi-carrier transmission
- Multi-carriertransmission
- Generalmulticarrier transmission
- Orthogonalfrequency division multiplex (OFDM)
- OFDMimplementation using the Fast Fourier Transform (FFT)
- Cyclicguard interval
- Powerspectral density of OFDM
- Peak-to-averagepower ratio (PAPR)
- Multipleaccess
- Principlesof time division multiple access (TDMA), frequency division multiple access(FDMA), code division multiple access (CDMA), non-orthogonal multiple access(NOMA), hybrid multiple access
- Spreadspectrum communications
- Directsequence spread spectrum communications
- Frequencyhopping
- Protectionagainst eavesdropping
- Protectionagainst narrowband jammers
- Shortvs. long spreading codes
- Directsequence spread spectrum communications in frequency-selective channels
- Codedivision multiple access (CDMA)
- Designcriteria of spreading sequences, autocorrelation function and crosscorrelationfunction of spreading sequences
- Intersymbolinterference (ISI) and multiple access interference (MAI)
- Pseudonoise (PN) sequences, maximum length sequences (m-sequences), Gold codes,Walsh-Hadamard codes, orthogonal variable spreading factor (OVSF) codes
- Multicodetransmission
- CDMAin uplink and downlink of a wireless communications system
- Single-userdetection vs. multi-user detection
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| Leistungsnachweis: |
| 611 - Digital Communications<ul><li>611 - Digital Communications: Klausur schriftlich</li><li>800 - Laboratory Digital Communications: schriftliche Ausarbeitung</li></ul> |
| ECTS-Kreditpunkte: |
| 6 |
| Weitere Informationen aus Stud.IP zu dieser Veranstaltung |
Heimatinstitut: Institut für Nachrichtentechnik (E-8)
In Stud.IP angemeldete Teilnehmer: 142
Anzahl der Postings im Stud.IP-Forum: 16
Anzahl der Dokumente im Stud.IP-Downloadbereich: 44
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