EC8652 – NOTES & QP
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EC8652 – SYLLABUS
UNIT I WIRELESS CHANNELS
Large scale path loss — Path loss models: Free Space and Two-Ray models -Link Budget design — Small scale fading- Parameters of mobile multipath channels — Time dispersion parameters-Coherence bandwidth — Doppler spread & Coherence time, fading due to Multipath time delay spread — flat fading — frequency selective fading — Fading due to Doppler spread — fast fading — slow fading.
UNIT II CELLULAR ARCHITECTURE
Multiple Access techniques — FDMA, TDMA, CDMA — Capacity calculations–Cellular concept- Frequency reuse — channel assignment- hand off- interference & system capacity- trunking & grade of service — Coverage and capacity improvement.
UNIT III DIGITAL SIGNALING FOR FADING CHANNELS
Structure of a wireless communication link, Principles of Offset-QPSK, p/4-DQPSK, Minimum Shift Keying, Gaussian Minimum Shift Keying, Error performance in fading channels, OFDM principle — Cyclic prefix, Windowing, PAPR.
UNIT IV MULTIPATH MITIGATION TECHNIQUES
Equalisation — Adaptive equalization, Linear and Non-Linear equalization, Zero forcing and LMS Algorithms. Diversity — Micro and Macro diversity, Diversity combining techniques, Error probability in fading channels with diversity reception, Rake receiver.
UNIT V MULTIPLE ANTENNA TECHNIQUES
MIMO systems — spatial multiplexing -System model -Pre-coding — Beam forming — transmitter diversity, receiver diversity- Channel state information-capacity in fading and non-fading channels.