Digital Data Communication

Below is the syllabus for Digital Data Communication:-

UNIT-I

MODULATION TECHNIQUES

Basic constituents of Communication Systems need modulation, Amplitude modulation, the spectrum of AM wave, modulation index, DSBSC modulation, SSB Modulation, vestigial sideband modulation.

ANGLE MODULATION: Frequency and Phase Modulation, the spectrum of FM Wave, modulation index, and Bandwidth of FM Signal, NBFM, and WBFM.

UNIT-II

DATA ENCODING

Digital data, Digital signals: Encoding schemes: NRZ-L, NRZ-I, Manchester-Diff-Manchester- encoding, Pseudoternary-Bipolar-AMI, B8ZS- HDB3 – Evaluation factors-Digital data, analog signals: Encoding Techniques –ASK-FSK-PSK-QPSK-Performance comparison-Analog data, digital signals: Quantization- Sampling theorem-PCM-Delta modulation-Errors- comparison- Analog Data, analog signals: Need for modulation -0 Modulation methods – Amplitude modulation- Angle modulation- Comparison.

UNIT-III

DIGITAL DATA COMMUNICATION TECHNIQUES

Asynchronous and synchronous transmission –Error Detection techniques: Parity checks – Cycle redundancy checks-Checksum-Error Correcting codes: Forwards and backward error corrections, Transmission media. Communication Topologies.

DTE & DCE interface: Characteristics of DTE-DCE interface. Interfaces: Rs-232-C, Rs-449/422, A/423-A.

UNIT-IV

SATELITE COMMUNICATION

Multiplexing: Advantages – Types of Multiplexing – FDM – Synchronous TDM – Statistical TDM or Asynchronous TDM, Study of their characteristics.

Satellite Communication Systems: Satellite parameters and configurations – Capacity allocation, Frequency Division FDMA; Time Division TDMA- Fixed assigned multiple access (FAMA), Demand assigned multiple access (DAMA) – The concept of spread spectrum: FHSS, DSSS – CDMA – Transmission and reception.

TEXTBOOKS

Forouzen, “Data Communication & Networking”, Tata Mcgraw Hill
Proakin, “Digital Communications”, Mc Graw
Stalling, “Wireless Communication and Networks” Pearson.

REFERENCES

Stallings, “Data & computer Communications”, PHI.
Roden, “Digital & Data Communication Systems”, PHI.
Irvine, Data communications & Networks An engineering approach, Wiley India

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