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OFDM Basics: Channel Estimation and Frequency Offset Correction
This lecture covers the fundamentals of Orthogonal Frequency Division Multiplexing (OFDM), focusing on channel estimation and frequency offset correction. The instructor explains how OFDM divides bandwidth into smaller chunks, modulates bits into values, and uses cyclic prefixes for synchronization. The lecture delves into the challenges of residual carrier frequency offset and sampling frequency offset, detailing the impact of phase accumulation and interference. Various MAC protocols, such as TDMA and FDMA, are discussed, highlighting the trade-offs between reservation-based and contention-based approaches. The session concludes with an overview of CDMA and its applications in 3G and GPS systems.