Method for joint time synchronization and frequency offset...

Pulse or digital communications – Spread spectrum – Direct sequence

Reexamination Certificate

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Details

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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A new training symbol structure to enhance the performance of channel estimation for MIMO-OFDM systems Myeongcheol Shin; Hakju Lee; Chungyong Lee; Dae Hee Youn; Acoustics, Speech, and Signal Processing, 2003. Proceedings. (ICASSP '03). 2003 IEEE International Conference on vol. 4, Apr. 6-10, 2003 pp. IV-397-IV-400 vol. 4.
Zhongshan Zhang, et al. “Frequency Offset Estimation with Fast Acquisition in OFDM System.” IEEE Communications Letters, vol. 8., No. 3, Mar. 2004.
Zhongshan Zhang, et al. “Joint Frame Synchorization and Frequency Offset Estimation OFDM Systems.” IEEE Transactions on Broadcasting, vol. 51., No. 3, Sep. 2005.

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