Final ppt

Channel Modeling and Kalman Filter based Estimation of OFDM wireless Communication Systems M.Tech Progress seminar: Presented by: Barnali Dey

Outline ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Motivation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Introduction to OFDM System ,[object Object],Fig:2 Single Carrier System Fig:1 Multi-Carrier System W=Bandwidth T= Sample time

OFDM System Architecture Figure : 3 Transmitter Receiver

Channel Modeling ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Transmitter Section ,[object Object],[object Object],[object Object],[object Object]

… cont. ,[object Object],[object Object],[object Object],[object Object]

… ,[object Object],[object Object],[object Object],[object Object]

Channel The transmitted signal y(t) travels though wireless channel through multi-paths in various types of environments (indoor, outdoor, static and mobile) thus the signal y(t) undergo distortion, scattering, reflection and addition of noise. These phenomenon ultimately characterizes the channel mathematically in terms of (i) delay spread and (ii) fading coefficients of the channel, which are treated as random variables.

Contd… ,[object Object],Unit delay Unit delay Unit delay + + + h0 h1 h2 hx y(t) h(t,tau)

Channel model ,[object Object],[object Object],[object Object]

… contd ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Receiver ,[object Object],[object Object],[object Object],[object Object],[object Object]

… .contd ,[object Object],[object Object],[object Object]

Simulation Parameter for OFDM Transmission ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Simulation Results of OFDM signal generated, transmitted and received when passing through a Rayleigh fading channel

(1) BPSK Modulation data in the Transmitter

(2) Transmitted baseband OFDM signal to channel

(3) Power of faded OFDM signal after passing through Rayleigh channel

(5) Received signal after passing through channel and corrupted with white Gaussian noise

Channel characterization and modeling ,[object Object],[object Object],[object Object],[object Object]

Channel model as AR process ,[object Object],[object Object],[object Object]

Determination of AR parameter ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

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Problem Statement- Channel State Estimation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

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