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EC-802 (B) Wireless Communication Notes

5 notes for Wireless Communication, unit by unit.

Unit 1 · Short notes Introduction Applications and requirements of wireless services – history, service types, performance requirements, economic and social aspects. · Technical challenges in wireless communications – multipath propagation, spectrum scarcity, limited energy, user mobility, noise and interference‑limited environments. · Propagation mechanisms – free‑space loss, reflection and transmission, diffraction, scattering by rough surfaces, and wave guiding.
Unit 2 · Short notes Wireless Propagation Channels Statistical description of the wireless channel – time‑invariant and time‑variant two‑path models, small‑scale fading (with/without dominant component), Doppler spectra, temporal fading dependence, and large‑scale fading. · Wideband and directional channel characteristics – delay dispersion causes, system‑theoretic description of wireless channels, WSSUS model, condensed parameters, ultra‑wideband channels, and directional descriptions.
Unit 3 · Short notes Channel Models Channel models – narrowband, wideband and directional models; deterministic channel‑modeling methods. · Channel sounding – introduction, time‑domain measurements, frequency‑domain analysis, modified measurement techniques, and directionally resolved measurements. · Antennas – fundamentals, antennas for mobile stations, and antennas for base stations.
Unit 4 · Short notes Transceivers and Signal Processing Structure of a wireless communication link – transceiver block diagram and simplified models. · Modulation formats and demodulation architectures. · Error probability analysis in additive white Gaussian noise (\(\text{AWGN}\)) channels, flat‑fading channels, and delay/frequency‑dispersive fading channels.
Unit 5 · Short notes Diversity Diversity techniques – introduction, micro‑diversity, macro‑diversity, simulcast, signal combination, error probability with diversity reception, and transmit diversity. · Equalization methods – introduction, linear equalizers, decision‑feedback equalizers, maximum‑likelihood sequence estimation (Viterbi detector), comparative analysis of equalizer structures, fractional‑spaced equalizers, and blind equalizers.

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