Communication Systems - I

Communication Systems - I

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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.6.4.2 shows the transmitter of Differential Pulse Code Modulation (DPCM) system . The sampled signal is denoted by x(nTs) and the predicted signal is denoted by x(nTs). The comparator finds out the difference between the actual sampleanbsp;...

Title:Communication Systems - I
Publisher:Technical Publications - 2008-01-01


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