Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2005-11-22
2009-08-04
Ghayour, Mohammad H (Department: 2611)
Pulse or digital communications
Spread spectrum
Direct sequence
C375S260000, C375S353000, C375S354000, C375S368000, C375S371000, C370S203000, C370S320000, C370S503000
Reexamination Certificate
active
07570684
ABSTRACT:
Embodiments of the present invention include a method for performing joint time synchronization and carrier frequency offset estimation in a wireless communication system, comprising steps of: on a transmitter: performing frequency domain spreading and interleaving on input data by using a predetermined spreading factor (SF) to generate a frequency domain training symbol; performing Inverse Discrete Fourier Transformation (IDFT) on the generated frequency domain training symbol to generate a first time domain training symbol; reversely copying the generated first time domain training symbol to a second time domain training symbol such that a complete training sequence is formed; and on a receiver: detecting an average power of received signals to judge the coming of a training sequence, and performing coarse frame synchronization; performing joint fine frame synchronization and carrier frequency offset estimation based on a received training sequence; and compensating for the carrier frequency offset based on the carrier frequency offset estimation result so as to eliminate the carrier frequency offset. In addition, embodiments of the present invention also include an apparatus for performing joint time synchronization and carrier frequency offset estimation and a method for generating a training sequence.
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Kayama Hidetoshi
Zhang Zhongshan
Blakely , Sokoloff, Taylor & Zafman LLP
Ghayour Mohammad H
Hassan Sarah
NTT Docomo Inc.
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