Detection method for accidental precursor access

A random access preamble and detection method technology, applied in digital transmission systems, electrical components, modulated carrier systems, etc., can solve the problems of insufficient accuracy of uplink timing adjustment information, high data processing complexity, and low access success rate, etc. problems, to achieve the effect of reducing the difficulty of data processing, reducing signaling overhead, and eliminating timing errors

Active Publication Date: 2014-02-19
ZTE CORP
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Problems solved by technology

[0018] To sum up, in the existing LTE system, when the mobile terminal completes the uplink synchronization through the RACH channel to access the system, there are problems such as low access success rate or high false alarm rate caused by the inability to quickly and accurately estimate the noise power, The complexity of data processing is relatively high, and there are defects such as high false alarm rate caused by the use of oversampling technology and insufficient accuracy of the obtained uplink timing adjustment information

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  • Detection method for accidental precursor access
  • Detection method for accidental precursor access
  • Detection method for accidental precursor access

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Embodiment Construction

[0043] The method of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments of the present invention.

[0044] In the LTE standard, it is stipulated that the bandwidth occupied by the RACH signal in the frequency domain is 1.08 MHz, and the interval between each RACH sub-carrier is 1.25 KHz. In this way, there are 864 RACH subcarriers in this bandwidth range, among which 839 subcarriers are placed with RACH data, and the remaining 25 subcarriers are used as guard bands. The LTE standard also stipulates that the time domain format of the RACH signal is: a cyclic prefix (CP, Cycle Prefix) followed by a RACH preamble, and the RACH preamble is followed by a guard interval. Wherein, no signal is sent within the guard interval.

[0045] The following is based on the measured false alarm rate target of 10 -3 When the relative detection threshold is used, the RACH signal with a sampling frequency of 30.72 MHz is ...

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Abstract

A detecting method of random access preamble includes: carrying out the noise average estimating and the absolute threshold calculating to the time domain RACH signal of the selected local root sequence, wherein the signal is obtained by time domain correlating processing the preamble part of random access channel RACH; selecting an undetected available searching window as the current searching window among the available searching windows corresponding to the selected local root sequence, detecting the time domain correlation values in the current searching window to obtain detecting result values, and judging the detecting result values and their corresponding time domain positions according to preset selecting terms to confirm the timing position of the RACH preamble signal. The method determines the timing position rapidly and precisely, provides the mobile terminal with reliable uplink timing adjusting information, guarantees the accuracy of uplink synchronization, effectively eliminates the timing error caused by over sampling, and reduces false alarms in the detection.

Description

technical field [0001] The invention relates to an access signal detection technology in the field of mobile communication, in particular to a detection method for a random access preamble. Background technique [0002] In the Long Term Evolution (LTE, Long Term Evolution) system, after the mobile terminal is turned on, it first performs downlink synchronization through the Synchronization Channel (SCH, Synchronization Channel), finds the receiving start point of the wireless frame and subframe, and the cell ID (Cell ID); then detects The broadcast channel (BCH, BroadcastChannel) acquires system information, including random access channel (RACH, Random Access Channel) configuration information; finally, the uplink synchronization is performed through the RACH channel, and the work of accessing the system is completed. [0003] In the process of uplink synchronization of the mobile terminal, firstly find the position of the RACH channel based on the receiving starting point ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/7075H04L27/26
CPCH04L27/2656H04L27/2662H04W74/0866
Inventor 薛妍翟羽佳谭欢喜
Owner ZTE CORP
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