Data buffer storage method and device for broadband code division multiple access multipath diversity receiver

Abstract

This invention relates to a data buffer storage method for a wide band CDMA multiroute diversity receiver, which uses storing input data by a memory group, a counter generates write-address and write-control signals to fetch data according to the memory read-address generated from the multiroute phase and the write-address to output the data for demodem after rearray to eliminate the time difference of demodem for different multiroute-phase offsets to eliminate multiroute-phase time difference and reduce the complexity of successive process.

Description

technical field [0001] The present invention relates to the field of mobile communication, in particular, to a data buffering method and device for a multi-user multipath diversity (RAKE) receiver in a wideband code division multiple access (WCDMA) system during descrambling and despreading. Background technique [0002] In the wideband code division multiple access system, since the signals arrive at the receiving end through different propagation paths, they have different propagation delays, forming multipath fading channels; at the same time, due to the correlation between the different phase differences of the signal code sequences It is very low, and the multipath delay components longer than one chip period are irrelevant and appear as separable paths in the model. Therefore, in the WCDMA system, the multipath diversity receiving device, that is, the RAKE receiver, is usually used to receive the signal. [0003] The RAKE receiver realizes the reception of the user sig...

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Problems solved by technology

[0005] Although these methods can reduce certain hardware resources and realize multiple multipath parallel demodulation, because the phases of each multipath are different, the signals obtained by the corresponding demodulation subsystem and channel estimation subsystem cannot be aligned in time. There is a time difference, so a certain length of data needs to be stored when performing multipath merging, and the merging cannot be performed until all multipath phase data are included

In this way, when multipaths are merged, due to the time difference between the multipaths, the system needs a certain storage space to store the demodulation data of all multipaths to eliminate the time difference between the multipaths, resulting in the complexity of the system and hardware Difficulty in achieving

Especially when the RAKE receiver of the base station receives multiple users, the complexity of multipath combination in the system is intensified, which also makes the hardware implementation of the system more difficult

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