Book Contain of Introduction to Digital Communication Systems, Block diagram of digital communication system, Channel capacity, Shannon's limit, sampling Theorem -Mathematical proof of sampling and reconstruction –ideal and Flat top sampling, Band pass sampling. Pulse digital modulation :Pulse code modulation, generation and detection of PCM, Uniform quantization and companding, Differential PCM; Delta modulation, Adaptive delta modulation; Signal-to- Noise Ratio calculations in PCM, DM . Base band data transmission: Communication over Band limited AWGN Channel, ISI in band limited channels, Zero-ISI condition- the Nyquist criterion, Solution for zero ISI, Raised cosine filters, Partial response signalling-Duo binary encoding, M-ary baseband system, eye pattern, adaptive Equalization.