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A pilot capture method and device based on splitting pattern matching filter

A matched filter and pattern matching technology, applied in selection devices, diversity/multi-antenna systems, code division multiplexing systems, etc. Insufficient consideration of the problem, large scale of hardware register resource consumption, etc., to achieve the effect of facilitating detection threshold setting, saving register hardware resources, and simple threshold setting

Inactive Publication Date: 2005-01-26
SANECHIPS TECH CO LTD
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AI Technical Summary

Problems solved by technology

If a conventional matched filter is used to achieve descrambling, the hardware register resource consumption scale is too large; in order to meet the performance indicators required by the standard, a multi-threshold judgment method is adopted, and the threshold setting and judgment are relatively complicated; The method of secondary verification increases the amount of data processed by the hardware in a short period of time, and actually increases the resources consumed by the hardware implementation; only the coherent accumulation method is used to process the received data, and the original data between the base station and the mobile station Practical application issues such as vibration frequency deviation have not been fully considered, etc.
Existing technical solutions cannot well solve the practicality and applicability of leading capture

Method used

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  • A pilot capture method and device based on splitting pattern matching filter
  • A pilot capture method and device based on splitting pattern matching filter
  • A pilot capture method and device based on splitting pattern matching filter

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Embodiment Construction

[0051] The implementation of the technical solution will be further described in detail below in conjunction with the accompanying drawings.

[0052] exist image 3 In , the splitting process of the scrambling code (M=2) is shown. If within the same time (such as 1 chip or 1 / 2 chip), through the scheduling of the scrambling code, complete the data on multiple detection phases, such as completing M (M is the power of 2, called splitting Coefficient) detection phase current data processing, then the required shift register order will be reduced to N / M, such scrambling code scheduling is called splitting, and the corresponding matched filter also works in splitting mode.

[0053] exist Figure 4 , which shows the operation of the matched filter in split mode. Compared with the conventional matched filter, the processing efficiency of the matched filter in the split mode is unchanged, but the data shift register is reduced to the original 1 / M, and the length of the scrambling c...

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Abstract

The invention discloses a preamble capturing method and device based on splitting mode matching filter, and the device includes local scramble generator, scramble shift register, scramble splitter, scramble latching register composed of multigroup registers, scramble multiplexer, data receiving shift register, matching filter, coherence accumulator, fast Hadamard transform module, sum of square module, noncoherence accumulator, noise estimator, threshold setting module, and threshold comparer; where the former four ones are connected in turn and connected to the matching filter together with the data receiving shift register; the matching filter further connects in turn the coherence accumulator, the fast Hadamard transform module, the sum of square module and the noncoherence accumulator to the threshold comparer; the noise estimator is connected thorugh the threshold setting module to the threshold comparer. It can reduce sources consumption and ASIC design complexity.

Description

technical field [0001] The invention relates to a mobile communication network system, in particular to a fast acquisition method and device for accessing a preamble in a random access channel in a code division multiple access (CDMA) system. Background technique [0002] Random Access Channel (RACH) is an uplink transmission channel in a code division multiple access mobile communication system. It is used to transmit control information from the mobile station, such as registering with the network after the mobile station is turned on, establishing a connection request, initializing the call, Location updates after moving from one area to another, etc. The base station realizes the synchronization with the mobile station by capturing the access preamble (Preamble) of the random access channel, and then realizes the communication with the mobile station. Therefore, establishing a random access channel is actually a basic premise for the mobile station to work. Since the m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H17/02H04B1/707H04B7/02H04B7/26H04W74/08
Inventor 陈波峰刘新阳田万廷皮兴俊
Owner SANECHIPS TECH CO LTD
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