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

Abstract

A multi-path searcher for an Uplink Dedicated Physical Channel (UDPCH) in a Code Division Multiple Access (CDMA) system comprises an initial phase acquirement module, an initial wide-search module, a conventional small-search module, a conventional large-search module and a multi-path combination module, wherein the initial phase acquirement module is set to simultaneously start the conventional small-search module and the conventional large-search module when acquiring the initial phase of the UDPCH, the initial wide-search module is set to simultaneously start the conventional large-search module and the conventional small-search module after synchronization, the conventional large-search module is set to acquire the multi-path information of the conventional large-search according to the location information of the conventional large-search, the conventional small-search module is set to acquire the multi-path information of the conventional small-search according to the location information of the conventional small-search, the multi-path combination module is set to combine the multi-path information of the conventional large- search and that of the conventional small-search, and acquire the final multi-path set Accordingly, a multi-path search method for an UDPCH in a CDMA system is also provided. The present invention saves search resources and guarantees higher search accuracy.

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 uses the correlation characteristics of the direct spread spectrum sequence, uses multiple correlators to separate multipath signals, ...

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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