EC-801 Advanced Communication Systems

EC-801 Advanced Communication Systems

Unit-I
Channel coding: Introduction, Block codes, Convolutional codes, Trellis-coded modulation, Turbo-codes, Low density parity check
codes, coding for the fading channels.
Speech coding: Introduction, the sound of speech, stochastic models for speech, quantization and coding, from speech transmission
to acoustic telepresence.


Unit-II
Orthogonal Frequency Division Multiplexing (OFDM)
Introduction, principle of OFDM, implementation of transceivers, frequency-selective channels, channel estimation, peak ro average
power ratio, intercarrier interference, adaptive modulation and capacity, multiple access, multicarrier code division multiple access,
single carrier modulation with frequency-domain equalization.
Multiantenna system: smart antennas, multiple input multiple output systems.


Unit-III
Global System for Mobile Communications (GSM)
Historical overview, system overview, the air interface, logical and physical channels, synchronization, coding, equalizer, circuitswitched
data transmission, establishing a connection and handover, services and billing.
Interim Standard 95 (IS-95) and Code Division Multiple Access (CDMA 2000)
Historical overview, system overview, the air interface, coding, spreading and modulation, logical and physical channels, handover.


Unit-IV
Wideband Code Division Multiple Access (WCDMA)
Historical overview, system overview, the air interface, logical and physical channels, speech coding, multiplexing and channel coding,
spreading and modulation, physical-layer procedures.
Statistics of Cellular systems
Time delay spread, Noise figure, power limited and bandwidth-limited system, mobile and portable coverage, Ray-tracking and buildingblock
approach, coding scheme and variable burst-error intervals, antenna down-tilt, lnter-modulation, mobile location, angle spread
with antenna height and its application.


Unit V
New Concepts
Channel capacity in a Rayleigh fading environment, real-time running average, link capacities versus call drops between GSM and
CDMA, data transmission via cellular systems, multiuser detection for CDMA, spectrum and technology of a WLL system, wavelet
representation.


References:
1. A. F. Molisch: Wireless Communications, Wiley India Pvt. Ltd.
2. W. C. Y. Lee: Mobile Communications Engineering- theory and practices, TMH.
3. Upena Dalal: Wireless Communications, Oxford University Press.
4. Kamilo Feher: Wireless Digital Communications, PHI Learning.
5. Mullet: Introduction to Wireless Telecommunication Systems and Networks: Cengage Learning.


List of Experiments:
Practical should be performed using Scilab/ Matlab simulation software based on the above contents some may be as follows:
1. Simulation of block codes, convolutional codes, parity check codes etc.
2. Simulation of transreceiver in OFDM and plotting of BER vs SNR graphs for coded and uncoded OFDM .
3. Simulation of transmission through a rayleigh fading channel.
Other practical may include study of:
1. Coding, multiplexing, interleaving, spreading, modulation and demodulation in uplink and downlink for GSM and CDMA.
2. Data transmission via cellular systems.
3. Smart antennas and MIMO systems.

Posted in: