Signal acquisition in a wireless communication system

Details Signal acquisition in a wireless communication system Signal acquisition in a wireless communication system

2004-12-22

2011-11-29

Ha, Dac (Department: 2611)

Pulse or digital communications

Spread spectrum

C375S142000, C375S150000, C375S343000, C375S213000, C375S213000, C375S350000, C375S345000, C375S213000

Reexamination Certificate

active

08068530

ABSTRACT:
Each base station transmits a TDM pilot 1 having multiple instances of a pilot-1 sequence generated with a PN1 sequence and a TDM pilot 2 having at least one instance of a pilot-2 sequence generated with a PN2 sequence. Each base station is assigned a specific PN2 sequence that uniquely identifies that base station. A terminal uses TDM pilot 1 to detect for the presence of a signal and uses TDM pilot 2 to identify base stations and obtain accurate timing. For signal detection, the terminal performs delayed correlation on received samples and determines whether a signal is present. If a signal is detected, the terminal performs direct correlation on the received samples with PN1 sequences for K1different time offsets and identifies K2strongest TDM pilot 1 instances. For time synchronization, the terminal performs direct correlation on the received samples with PN2 sequences to detect for TDM pilot 2.

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