EC8652 Wireless Communications
Prepared by
S.Santhosh (Admin)
Important questions
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UNIT -1
2. Path loss**.
Rare
3. Fading fur to multiple path delay
4. Two ray ground reflection model
UNIT-2
1. Handoff scenerio**
2.TDMA
3. Trunking ,grade service of cell system
1. QPSK (Full topic)
Rare
3.OFDM
UNIT-4
1.Diversity combining techniques
2. Take receiver
3. Equalizers (adaptive ,liner ,nonlinear )
UNIT-5
1.MIMO full topic
2. Beamforming techniques
**Very important questions are bolded and may be asked based on this topic
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UNIT I WIRELESS CHANNEL
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 CHANNEL
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 TECHNIQUE
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 TECHNIQUE
MIMO systems – spatial multiplexing -System model -Pre-coding - Beam forming - transmitter diversity, receiver diversity- Channel state information-capacity in fading and non-fading channels.