Signals a SystemsClassification of signals, Complex exponentials as orthogonal functions, Complex exponential fourier series, Fourier transform, Signal spectra, Energy a power density spectrum, Auto a cross correlation functions, Properties of fourier transforms, Fundamental properties of system, System analysis transfer function, Distortionless transmission through system such as ideal filters, group a phase delay.Random Variables Stochastic Processes a Probability TheoryDefinition of probability experiment, Event, Sample space, Point probability statistical independence of events. Joint a conditional probabilities, Discrete a continuous random variable concept, Cumulative distribution a probability density functions, Their properties a interrelation. Standard probability distribution models like Poisson, Rayleigh, Biomial, Gaussian, etc. Central limit theorem random processes, Description, Ensemble average, Stationary a ergodic processes, Complementory error function.Mathematical Representation of NoiseSources of noise, Frequency domain representation of noise, Effect of linear filtering, Spectral a quadrature components of noise, Superposition of noise, Definition of additive white Gaussian noise, characterisation of internally generated noise, - noise bandwidth, Noise temperature, Signal to noise ratio, Noise figure calculations. Performance of linear a angle modulation system on the background of noise.Sampling of Analog Signals a Digital PAM TechniquesSampling theorem in frequency and time domain, Nyquist criterion, Reconstruction using interpolation filters, Ideal, Natural, Flat Samples, Aliasing, Aperture effect, Digital PAM, PAM-TDM, Cross talk, Guard time, Signalling rate.Waveform / Source Coding TechniquesLinear pulse code modulation, Block diagram of transmitter a receiver quantisation noise, Signal to quantisation noise ratio, Companding a nonuniform quantisation predictive coding theory, Delta modulation, Start up a slop overload error, Adaptive delta modulation, Differential PCM, Granular noise.Digital MultiplexingDigital multiplexers, Synchronous, Aschronous a quasisynchronous, Multiplexing hierarchies, Inverse a statistical multiplexing, Calculations of bit rate, PCM data format on line like RZ, NRZ, Bipolar, Unipolar, Manchester, AMI etc. and their spectral features, Frame a bit synchronization, Scramblers a unscramblers, ISI, eye diagram, Equalisation.Digital CW Modulation TechniquesMathematical equations, Signal space representation, Spectral representation a BW requirement constellation diagram, Block schematic to generate a receive for following systems : BPSK, QPSK, OQPSK, Quadratire amplitude modulation, BPSK, M'ary PSK and FSK, Minimum Shift Keying (MSK) a Gaussion MSK.Detection of Binary Signals in Presence of NoiseOptimum a matched filtering, Decision threshold, Coherent detection, Error probability, Calculations for above modulation systems.Large number of examples from university question papers are included in this edition. ... Hints about answers are also given. ... The majority of digital and analog communication systems are characterised as linear time invariant systems.

Title | : | Communication Systems - I |

Author | : | J.S.Chitode |

Publisher | : | Technical Publications - 2008-01-01 |

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