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Leader sequence detection method and device for random access channel

A technology of random access channel and preamble sequence, which is applied in the field of preamble sequence detection of random access channel, can solve the problems of excessive computation and complex processing process, and achieve the effect of reducing computation

Active Publication Date: 2012-01-11
WUHAN HONGXIN TELECOMM TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0030] In view of this, the present invention provides a method and device for detecting a preamble sequence of a random access channel, so as to overcome the problems of excessive computation and complicated processing procedures in the prior art when time-domain correlation is used for detection based on a threshold

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  • Leader sequence detection method and device for random access channel
  • Leader sequence detection method and device for random access channel
  • Leader sequence detection method and device for random access channel

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Embodiment 1

[0100] Please refer to the attached figure 2 As shown, it is a flow chart of a method for detecting a preamble sequence of a random access channel disclosed in Embodiment 1 of the present invention, which mainly includes the following steps:

[0101] Step S101, extract or select the preamble subcarrier, obtain the corresponding local root sequence mask according to the logical root sequence number in the protocol, and perform a correlation operation on the extracted preamble subcarrier and its corresponding local sequence mask in the frequency domain, Finally, the PDP spectrum is obtained.

[0102] In the process of executing step S101, it should be noted that the local root sequence mask obtained corresponding to the subcarrier of the preamble sequence. First, a root sequence mask can be calculated according to a logical root sequence number in the protocol. For example, there are 836 logical root sequence numbers in the protocol, and a maximum of 836 root sequence masks c...

Embodiment 2

[0129] As described in Embodiment 1, in order to make the entire leading sequence detection process faster and simpler, the local root sequence mask corresponding to the index of each logical root sequence number is pre-calculated and stored locally in the form of a table of. When the local root sequence mask needs to be used, the corresponding local root sequence mask can be extracted or called from the table according to the index of the logical root sequence number. It can reduce the amount of calculations to generate the local root sequence mask every time it is recalculated. For the corresponding optional 64 preamble sequences in one cell, n_root_seq local root sequence masks are required to generate the 64 preamble sequences.

[0130] When the base station detects the preamble sequence, it needs to perform correlation calculations on the received preamble sequence subcarriers and n_root_seq local root sequence masks, and then make corresponding judgments, that is, to pe...

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Abstract

The invention discloses a leader sequence detection method and a device for a random access channel. The method comprises the following steps that: sub carrier waves of a leader sequence are extracted, the related operation is carried out with the corresponding local root sequence mask in the frequency domain to obtain the time domain channel power time delay spectrum power delay profile (PDP); the noise estimation is carried out on the PDP to obtain the noise estimation value; the width and an initial position of a detection window are calculated; the peak searching is carried out on the determined current detection window; the signal-to-noise calculation is carried out according to the searched peak and the noise estimation value to obtain the corresponding signal-to-noise ratio; and the signal-to-noise ratio and the judgment threshold are compared, and the detected leader sequence is determined in the current detection window when the signal-to-noise ratio is greater than the judgment threshold. The leader sequence detection method the device have the advantages that the simplification processing is respectively carried out on the relative operation, noise estimation and signal-to-noise ratio operation processes in the detection process, so the goals of reducing the operation quantity in the leader sequence detection process and reducing the processing complexity are realized.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, and more specifically, relates to a preamble detection method and device of a random access channel. Background technique [0002] In an existing LTE (Long Term Evolution, long-term evolution) system, a Zadoff-Chu sequence (ZC sequence for short) with a constant envelope and zero autocorrelation is generally used to generate a preamble sequence for random access. In LTE, each cell has 64 preamble sequences, these 64 preamble sequences are generated by the root sequence, which can be different cyclic shift sequences from the same root sequence, or different cyclic shift sequences from different root sequences sequence. The base station side generates 64 preamble sequences of the cell according to the system broadcast parameter configuration of the cell. [0003] In the process of establishing uplink synchronization of the LTE system, RACH (Random Access Channel, random acc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W74/08H04L25/02
Inventor 许梦姜韬
Owner WUHAN HONGXIN TELECOMM TECH CO LTD
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