Method and apparatus for accurate time synchronization in wireless communication system

摘要

A method and apparatus for time synchronization and an OFDMA receiver thereof are provided. A preamble timing is obtained by a two-stage correlation in a time domain between a sequence of a received symbol and a reference preamble. The two-stage correlation is further simplified to perform a conjugate multiplication between a one-stage correlation and its correspondingly delayed result. A preamble boundary is adaptively determined by a peak value based on a result of the two-stage correlation. In this way, the time synchronization is achieved with a robust performance in a low SNR, high frequency offset or large delay spread fading channel.

主权项

1. A method for performing time synchronization, comprising:
receiving a sequence of symbols; performing a two-stage correlation in a time domain based on the sequence of symbols and a reference preamble, the step of performing a two-stage correlation includes:
performing a one-stage correlation in the time domain based on the sequence of symbols and the reference preamble and obtaining a result of the one-stage correlation, the step of performing a one-stage correlation includes:
performing a conjugate operation on the reference preamble;multiplying two most significant bits of the sequence of symbols received and a conjugate reference preamble in the time domain; andperforming addition of complex multiplication results;delaying the result of the one-stage correlation by a predetermined time period to produce a delayed result;performing a conjugate operation on the result of the one-stage correlation to produce a conjugate result; andmultiplying the delayed result and the conjugate result and obtaining the result of the two-stage correlation; and detecting a preamble symbol based on a result of the two-stage correlation.