Synchronization in WLAN

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Next . . . • Overview • Timing Estimation • Frequency Synchronization •Channel Estimation • Summery WLAN Synchronization 16.3.2004 © Hafeth Hourani 30
Channel Estimation • Channel Estimation is the task of estimating the frequency response of the radio channel • The impulse response of a time varying channel ( ) ∑ h τ t α t e δ τ τ t − 2 ( ) ; ( ) j π f cτn = t n ( − n( )) n • The WLAN applications generally assume a quasistationary channel h = ∑ − − 2 ( ) ( ) j π f cτn τ α t ne δ( τ τn) n • There are two approaches for handling the channel estimation • Frequency Domain • Time Domain WLAN Synchronization 16.3.2004 © Hafeth Hourani 31
Page 1 and 2: S-72.333 Postgraduate Course in Rad
Page 3 and 4: Next . . . •Overview • Timing E
Page 5 and 6: Synchronization in Packet-Switched
Page 7 and 8: Timing Estimation Overview Timing E
Page 9 and 10: • Packet detection test H H 0 1 :
Page 11 and 12: Packet Detection Methods Timing Est
Page 13 and 14: Received Signal Energy Detection (c
Page 15 and 16: • The result of the DSW does not
Page 17 and 18: Preamble Aided Detection (cont’d)
Page 19 and 20: Packet Detection Methods Timing Est
Page 21 and 22: Symbol Timing Algorithm • Symbol
Page 23 and 24: Sample Clock Synchronization • Th
Page 25 and 26: Estimating the Sampling Frequency E
Page 27 and 28: Next . . . • Overview • Timing
Page 29: Frequency Synchronization Approache
Page 33 and 34: Frequency Domain Channel Estimation
Page 35 and 36: Next . . . • Overview • Timing
Page 37 and 38: References • OFDM Wireless LANs:
Page 39: Homework • Q1. In that equation i

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