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 invention relates to the field of mobile communication, in particular to a data buffering method and a device thereof during descrambling and despreading of a multi-user multipath diversity (RAKE) receiver in a wideband code division multiple access (WCDMA) system. Background technique [0002] In wideband code division multiple access system, since the signal arrives at the receiving end with different propagation paths, it has different propagation delays, forming a multipath fading channel; at the same time, due to the correlation between the different phase differences of the signal code sequence is very low, and the multipath delay component greater than one chip period is irrelevant, and it appears as a separable path in the model. Therefore, in WCDMA systems, multipath diversity receiving equipment, namely RAKE receiver, is usually used to receive signals. [0003] The RAKE receiver descrambles and despreads the multipaths of different phase...

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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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