Cyclically symmetrical preamble signal sending system and method, and cyclically symmetrical permeable signal receiving system and method

Abstract

The invention provides a cyclically symmetrical preamble signal sending system and method, and a cyclically symmetrical permeable signal receiving system and method. The cyclically symmetrical permeable signal sending method comprises the following steps: generating a first time-domain basis symbol with a length of N; cyclically shifting the first time-domain basis symbol leftwards or rightwards by m sampling points, so that a second time-domain basis symbol with a length of N is obtained; carrying out repeated and alternate cascading extensions on the first time-domain basis symbol and the second time-domain basis symbol to obtain a random length, so that a preamble symbol is formed; carrying out signaling or data frame cascading behind the preamble symbol, so that a preamble baseband frame is formed; and modulating the preamble baseband frame into a radio frequency signal, and sending the radio frequency signal. The cyclically symmetrical preamble signal sending system and method and the cyclically symmetrical permeable signal receiving system and method provided by the invention have the advantages that timing estimation is more accurate, so that the timing estimation performance is greatly improved; regarding decimal carrier frequency offset estimation, the frequency offset estimation accuracy is improved; and the number of sampling points that are needed for sliding for peak detection is smaller, so that the detection time is shorter.

Description

technical field [0001] The present invention relates to the technical field of mobile communication, in particular to a system and method for sending and receiving cyclic symmetric preamble signals. Background technique [0002] In a wireless network such as an ad hoc network (Ad Hoc Network), before an initial link is established, both communicating parties do not know the frequency point for sending a signal. At this time, the transmitting end generally sends a paging preamble signal at its working frequency first, so that the receiving end can complete the acquisition of the paging preamble signal within a certain acquisition time window. The capture time window is generally much smaller than the length of the paging preamble signal, so as to ensure that the receiving end can make its capture time window within the duration of the paging preamble signal when traversing and searching multiple different frequency points. Since the frequency point used by the paging preambl...

AI Technical Summary

Problems solved by technology

[0010] (1) The resulting peak plateau will lead to ambiguity in timing estimates;

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