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Multi-path time-delay estimating method for direct spread-spectrum CDMA system

A technology of multi-path delay and spreading code, applied in the transmission system, communication between multiple stations, electrical components, etc., can solve the problems of impossible delay and deviation of adjacent paths, and achieve the elimination of mutual influence , improve the accuracy and eliminate the effect of influence

Inactive Publication Date: 2008-05-14
ZTE CORP
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Problems solved by technology

but from image 3 It can be seen that due to the change of the peak value and waveform, the delay of the first path found is incorrect, and removing the correlation component of this path from the correlation function will bring a greater deviation, so that the delay of the adjacent path obtained even less likely to be correct

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  • Multi-path time-delay estimating method for direct spread-spectrum CDMA system
  • Multi-path time-delay estimating method for direct spread-spectrum CDMA system
  • Multi-path time-delay estimating method for direct spread-spectrum CDMA system

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Embodiment Construction

[0019] The implementation of the technical solution will be further described in detail below in conjunction with the accompanying drawings.

[0020] In a direct spread spectrum code division multiple access system, a pilot signal is generally used to achieve synchronization. The pilot signal is an important part of the dedicated control channel (DPCCH), and the multipath search is performed when the receiving end knows the pilot signal and the scrambling code used in advance. The structure of the RAKE receiver is as follows: Figure 4 As shown, the baseband signals are sent to the searcher 401 and the M demodulators 403 respectively. The searcher 401 searches the multipath from the baseband signal, finds the time delay of each multipath, and provides it to each demodulator 403 respectively. The demodulator 403 demodulates the data according to the obtained time delay of each path, and sends the demodulated result to the path combiner 402 for combination and then outputs it....

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Abstract

Disclosed a multi-path delay estimation method of direct spread-spectrum code division multiple access system, comprises following steps: first, correlating the baseband signal with the attained disturbing code and pilot wave in different time delay to attain the magnitude time delay configuration and making the relation again with the Mexican straw hat function and the magnitude time delay configuration, to find the maximum peak value in attained wave as the time delay of one path; then, decreasing the magnitude time delay configuration component of said path from the former data, to make a relation with the Mexican straw hat function and the refreshed data to find the next path for cycling until finding the total paths. Since the time-frequency character of Mexican straw hat function, the operation of said invention can reduce the effect of noise on the magnitude time delay configuration while eliminating the effect between adjacent paths and improve the accuracy of time delay estimation of each path.

Description

technical field [0001] The invention relates to a method for estimating multipath time delay in a direct spread spectrum code division multiple access system in the field of wireless mobile communication, and more specifically relates to how to accurately estimate multipath time delay in a WCDMA system. Background technique [0002] In the third generation mobile communication system, since the wireless channel is quite wide, multiple users can use the same channel by applying spread spectrum and code division multiple access. With direct spreading sequences, information symbols are represented by a sequence of chips. At the wireless receiver, the correlation of the chip sequences is used to recover the information symbols. Radio waves travel along different paths between the transmitting location and the receiving location, so that for each transmitted signal, the receiver receives not a single signal, but multiple copies of the signal with different delays and different a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/707H04B7/26H04B1/7115H04B1/7117
Inventor 杨奕
Owner ZTE CORP
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