Method and device for multi-path searching in CDMA (code-division multiple access) system

Abstract

The invention discloses a method and a device for multi-path searching in a CDMA (code-division multiple access) system. Coherent integration calculation and incoherent integration calculation are respectively carried out to a dedicated physical control channel (DPCCH) and an enhanced dedicated physical control channel (E-DPCCH), thus obtaining relevant functions of the DPCCH channel and the E-DPCCH channel; the final relevant function is obtained by the calculation or selection according to the relevant functions of the DPCCH channel and the relevant functions of the E-DPCCH channel; subsequently, the multi-path set of the searching is obtained by peak detection and interpolation; and the multi-path set of the searching is used for tracking searching window so as to adjust the position of the searching window and is also used for carrying out multi-path combination with the historical multi-path set, thus obtaining the final multi-path set and outputting the final multi-path set to areceiver. In the invention, the multi-path searching is carried out under a situation that the DPCCH channel and the E-DPCCH channel coexist, the defects of singly using the DPCCH channel for searching under certain situations are overcome, and the whole performance of the searcher is improved.

Description

technical field [0001] The invention relates to the technical field of mobile communication, in particular to a multipath search method and device in a direct spread spectrum code division multiple access system. Background technique [0002] In the direct spread spectrum code division multiple access system, the uplink uses a pseudorandom sequence (PseudorandomNoise, PN sequence) to scramble the spread spectrum signal, so as to distinguish different users. If the local PN sequence generated by the wireless receiving end is completely synchronized with the phase of the PN sequence of the received signal, the received spread spectrum signal can be correctly despread. In order to complete the phase synchronization of the PN sequence of the received signal and effectively separate multipath, it is necessary to correctly estimate the time delay between transceivers and between signals of each path. [0003] At present, the pilot signal in the Dedicated Physical Control Channel ...

AI Technical Summary

Problems solved by technology

Due to the small energy of DPCCH itself and the interference of other code channels caused by the existence of multipath, the performance of searching with DPCCH in FRC8E-DPCCH Boosting mode deteriorates sharply

After rigorous theoretical derivation and link simulation, it is found that continuing to use DPCCH search in FRC8E-DPCCH Boosting mode can no longer meet the requirements of the receiver for searching multipath energy and accuracy, and the performance of the receiver cannot meet the requirements of the 3GPP protocol.

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