| 摘要 |
Terminal transmission method and the received signal model are used to develop two methods that estimate the starting time vicinity associated with a random access channel (RACH). First of said methods, called In*Qn RACH starting time vicinity estimation (STVE), multiplies the In and Qn branches of a sample and exacts the starting time of a preamble signal from the peak output of the phase metrics expression (for both even and odd periodicity). The second method, called (In+jQn)<2 >RACH STVE, performs a square operation on the received complex signal and calculates the peak output of the corresponding phase metric to extract the exact starting time of a preamble signal. Compliance with the standard of the 3<rd >generation for cellular systems is also described whereby the timing is synchronized, the uncertainty of the preamble phase (at the base station) is minimized, and the complexity of the RACH receiver is significantly reduced
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