Multi-path searching method of code division multiple access (CDMA) system and corresponding multi-path searcher

Abstract

The invention provides a multi-path searcher of the uplink dedicated physical channel (UL DPCH) in a code division multiple access (CDMA) system and the multi-path searcher comprises an initial phase acquisition module, an initial broad search module, a general big search module, a general small search module and a multi-path combination module, wherein the initial phase acquisition module is used to obtain the initial phase in the UL DPCH and initiate the general small search module and the general big search module, the initial broad search module is used to initiate the general small search module and the general big search module simultaneously after synchronization, the general big search module is used to obtain the multi-path information of the general big search according to the location information of the general big search, the general small search module is used to obtain the multi-path information of the general small search according to the location information of the general small search, and the multi-path combination module is used to combine the multi-path information of the general big search and the general small search together. Accordingly, the invention also provides a multi-path searching method of the UL DPCH in the CDMA system. The method and device of the invention can save the search resource and ensure higher search precision.

Description

technical field [0001] The present invention relates to a code division multiple access mobile communication system, in particular to a multipath search method for uplink dedicated physical channels in the code division multiple access system and a corresponding multipath searcher. Background technique [0002] The main characteristics of the wireless channel are multipath propagation and fading. The radio waves sent from the transmitter are affected by the topography and features in the surrounding environment on the propagation path, resulting in diffraction, reflection or scattering. The superposition of multiple signals propagating along the same path. [0003] Diversity combined reception is an effective technique to resist multipath fading, and a rake receiver is used in the CDMA system to process the received signal. The rake receiver utilizes the correlation characteristics of the direct spread spectrum sequence, uses multiple correlators to separate multipath signa...

AI Technical Summary

Problems solved by technology

[0028] Disadvantages 1) and 2) will affect the performance of the search, and may even cause call drop due to the lack of multipath search, which will affect the performance of the system and the subjective experience of users

For disadvantage 3), either it needs to consume more search resources, or it will affect the performance of the search, and neither of these two situations is what we want to see

All of the above drawbacks will have a very bad impact on commercial systems

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