FCB signal searching method and apparatus

Abstract

The invention relates to the field of communications, and discloses an FCB signal searching method and apparatus. In the invention, the method comprises: before a first data block is received, first of all, filling the DC component data of DC components of a segment of an I path and a Q path which are based on the first data block (the filled DC component data is greater than or equal to N), and then by taking the filled data as receiving data, utilizing an energy window sliding mode to search for FCB signals such that the FCB signals are successfully searched out, and it can be ensured that supplement data does not cause deformation of an FCB detection curve, and the FCB detection curve still remains inverted bell-shaped; and furthermore, after a last data block is received, filling DC component data of (N-M) DC components of the I path and the Q path which are based on the first data block so as to effectively simplify a calculating process, M being the number of data of the last data block.

Description

technical field [0001] The invention relates to the communication field, in particular to a search technology for FCB signals. Background technique [0002] When the GSM system needs to perform cell search (such as neighbor cell search or initial search in the connected state), it needs to receive GSM signals multiple times according to the protocol, and combine these multiple received GSM signals before performing FCB signal analysis. The existing FCB (Frequency Control Block, frequency control block) search method is to calculate the energy ratio of the baseband signal before and after passing through the bandpass filter. That is to say, currently, the filtering method is used to search for the FCB: firstly, the received data is filtered, and then the energy before and after filtering is compared. The filter is a bandpass filter, allowing the 67.7KHz single tone signal to pass, while signals at other frequencies are filtered out. If the received signal is FCB, the energy...

AI Technical Summary

Problems solved by technology

[0006] It can be seen that, in the actual test, when the FCB signal is at the beginning or the end of the received data block, it will be misjudged that the FCB signal cannot be found because the climbing or descending process of the energy ratio cannot be found.

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