Method and device of anti-frequency-offset detection of random access preamble

A random access preamble and frequency offset detection technology, applied in digital transmission systems, electrical components, transmission systems, etc., can solve the problems of large software and hardware resources, increased probability of missed detection, and long time consumption, and achieve accurate correlation values ​​and easy operation Ease, resource and time saving effects

Inactive Publication Date: 2014-11-05
COMBA TELECOM SYST CHINA LTD
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

This method not only takes a long time, but also consumes a lot of software and hardware resources. When estimating the frequency offset for the first time, it is also easy to

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  • Method and device of anti-frequency-offset detection of random access preamble
  • Method and device of anti-frequency-offset detection of random access preamble

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Embodiment Construction

[0023] The embodiment of the present invention realizes the accurate detection of the leading signal without any frequency offset estimation and compensation, and ensures that the false alarm probability and the missed detection probability meet the performance requirements at the same time. The present invention is explained in detail below in conjunction with the accompanying drawings.

[0024] The anti-frequency offset detection method of the random access preamble in the embodiment of the present invention, such as figure 1 shown, including steps:

[0025] Step S101 , segmenting the local sequence to obtain subsequences of the local sequence. The local sequence here can be generated in advance based on 16 signature sequences and in accordance with the 3GPP protocol, and the generated 16 local sequences use S i,j (i=1, 2, ..., N, j = 1, 2, ..., L) represents, where N = 16, that is, the number of signature sequences used when generating the random access preamble. The pro...

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Abstract

An embodiment of the invention discloses a method and a device of anti-frequency-offset detection of a random access preamble. The method comprises the following steps of: dividing a local sequence into a plurality of subsequences according to coherence time of a channel, segmentally taking each section of data of a receiving sequence to carry out correlation calculation with the subsequences of the local sequence, accumulating relevant results of the segments, and judging whether the receiving sequence has a preamble signal according to a final accumulative result. Owing to adopting a method of segmentally carrying out correlation calculation, the obtained correlation value is more precise, leak detection and false alarm probabilities are reduced, and influence of Doppler frequency offset is effectively restrained; the method and the device are suitable for all kinds of channels, operation can be easily implemented, frequency offset estimation and compensation are not needed, and a large amount of resources and time required for calculation and storage are saved.

Description

technical field [0001] The present invention relates to the technical field of mobile communication, in particular to a random access preamble anti-frequency offset detection method and device. Background technique [0002] WCDMA is a wireless transmission technology solution proposed by the third generation mobile communication system standardization organization 3GPP. Users access the WCDMA system through the public uplink physical channel PRACH (Physical Random Access Channel). The information transmitted by the PRACH channel consists of one or more random access preambles with a length of 4096chips and a message with a length of 10ms or 20ms. The length of the random access preamble is 4096chips, which is 256 repetitions of a signature sequence with a length of 16chips, and there are 16 signature sequences in total. A 10ms random access message includes 1 frame data, and a 20ms random access message includes 2 consecutive frame data. The length of the random access mes...

Claims

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Application Information

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IPC IPC(8): H04W74/08H04L5/00
Inventor 崔玲付磊施英
Owner COMBA TELECOM SYST CHINA LTD
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