Synchronization in WLAN

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Preamble Aided Detection (cont’d) • When the received signal consists of only noise, the output c n of the delayed crosscorrelation is zeromean r.v. • Once the start of the packet is received, c n is a crosscorrelation of the identical short training symbols, which causes m n to jump quickly to its maximum value • This jump gives a good estimate of the packet edge m n Sample index Algorithm response IEEE 802.11a packet with SNR = 10 dB jumps fast WLAN Synchronization 16.3.2004 © Hafeth Hourani 18
Packet Detection Methods Timing Estimation Packet Synchronization Sample Clock Tracking Symbol Synchronization Received Signal Energy Detection Double Sliding Window Packet Detection Preamble Assisted Packet Detection WLAN Synchronization 16.3.2004 © Hafeth Hourani 19
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: Preamble Aided Detection (cont’d)
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 and 30: Frequency Synchronization Approache
Page 31 and 32: Channel Estimation • Channel Esti
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

Synchronization in WLAN

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