A rake receiving implementation method and device of the pilot in the broadband code-division multi-address system
A wideband code division multiple access and receiving device technology, which is applied in the transmission system, communication between multiple stations, advanced technology, etc., can solve the problem of long processing time, achieve low cost, reduce DSP overhead, reduce The effect of power consumption
Inactive Publication Date: 2010-06-16
SANECHIPS TECH CO LTD
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[0003] Traditional hardware rake receive processing such as figure 2 As shown, in this kind of rake receiving hardware structure, the processing time of data needs at least 512chip (chip time), that is, the width of a pair of P-CPICH (Primary Common Pilot Channel, main common pilot channel) symbols, which is to carry out Channel estimation takes the least amount of time, and if some performance optimization processing is added, the processing time will be longer
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[0038] If the rake receiving and processing of PILOT is implemented by hardware, which is a frequently used and single-function functional module, it can reduce the overhead of DSP, reduce the operating frequency of DSP, and reduce the power consumption of the system. This is especially important for WCDMA terminals. The hardware implementation refers to debugging on the fpga (field programmable gate array), which can finally be made into an independent chip. The existing DSP implementation is implemented on the DSP board with software codes.
[0039] The PILOT hardware rake receiving unit that the present invention proposes is made of four parts: descrambling and despreading module, channel estimation module, PILOT extraction and compensation module, rake combining module, such as Figure 4 shown, where:
[0040] The descrambling and despreading module completes the descrambling and despreading process of the channel, and completes the descrambling and despreading of the cor...
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The present invention provides a rake receiver and receiving method of the pilot frequency of the wideband code division multiple accessing (CDMA) system. Firstly, the descrambling and despreading module performs descrambling and dispreading to the primary common pilot channel P-CPICH and downlink dedicated physical channel DPCH, and outputs the data of the corresponding channel; secondly, the data of the primary common pilot channel is estimated by the channel and is received by the module, then, the computing and filtering of the estimated value of the channel are performed to output the channel estimated value; thirdly, the pilot extracting and compensating module receives the data of said ownlink dedicated physical channel to extract pilot signals, and performs the channel compensatingto the pilot symbols by using the channel estimated value output from the channel estimating module at the current time and outputs the pilot signals having been compensated; finally, the rake combination module receives the compensated pilot symbols output from the pilot extracting and compensating module and performs combination. The pilot rake receiving unit is realized through hardware absolutely, and the pilot processing time is shortened, and the DSP spending and the power consumption are all reduced.
Description
technical field [0001] The invention relates to a mobile communication system, in particular to a rake receiving method and device for a digital baseband downlink pilot (PILOT) in a wideband code division multiple access (WCDMA) system. Background technique [0002] Digital baseband downlink receiving system in WCDMA such as figure 1 As shown, it consists of cell search / path search, rake reception, and DSP processing. The rake reception of the downlink includes channel descrambling and despreading, channel estimation / channel compensation, and rake combining. [0003] Traditional hardware rake receive processing such as figure 2 As shown, in this kind of rake receiving hardware structure, the processing time of data needs at least 512chip (chip time), that is, the width of a pair of P-CPICH (Primary Common Pilot Channel, main common pilot channel) symbols, which is to carry out Channel estimation takes the least amount of time, and if some performance optimization process...
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IPC IPC(8): H04B1/707H04B7/26H04B1/7115
CPCY02D30/70
Inventor 李旭
Owner SANECHIPS TECH CO LTD