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Method for acquiring pilot detection threshold of random access channel at physical layer

A random access channel and detection threshold technology, which is applied in the field of random access preamble detection threshold acquisition in code division multiple access systems, can solve the problems of inaccurate noise energy estimation and no real-time noise estimation module, etc.

Inactive Publication Date: 2008-06-04
ZTE CORP
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Problems solved by technology

[0009] The technical problem to be solved by the present invention is to provide a method for obtaining the random access preamble detection threshold by approximately estimating the noise when the real-time noise energy estimation value is not accurate enough or there is no real-time noise estimation module

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  • Method for acquiring pilot detection threshold of random access channel at physical layer
  • Method for acquiring pilot detection threshold of random access channel at physical layer
  • Method for acquiring pilot detection threshold of random access channel at physical layer

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Embodiment Construction

[0025] The present invention mainly proposes a method for calculating the preamble detection threshold of the physical layer random access channel in a WCDMA system. When accurate real-time noise estimation values ​​cannot be obtained, the dynamic noise estimation method in the present invention can be used to obtain more accurate The preamble detection amplitude or energy threshold of .

[0026] In the random access preamble detection, the input signal is descrambled, frequency offset descrambled, signature designature and correlation integral etc. are firstly processed to obtain the correlation amplitude values ​​of different time delay positions of each of the 16 signatures, where each The n lowest correlation amplitude values ​​of the signature are already close to the average level of the noise, so the noise I can be dynamically estimated by taking the average of the lowest n amplitude values ​​of each signature 0 At the same time, according to the random access multipath...

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Abstract

The invention relates to a method for obtaining a front detection threshold of physical layer random accessing channel, comprising the following steps: (a) in a stage of setting a system, an actual measurement is carried out in the system to obtain different coherent integral length CA, incoherent integral length N< CA > and noise estimation coefficient C which corresponds to an antenna amount N< ANT > and a look-up table is established; (b) when the system is operated, the coherent integral length CA, the incoherent integral length N< CA > and the antenna amount are set according to different cells; a Node B in a base station descrambles, relieves frequency offset, relieves signature and carries out relevant integration processing for inputted signals; the N biggest related amplitude values in related amplitude values of different time delay positions for each signature in the 16 signatures are recorded; (c) the least n amplitude values of the N related amplitude values for each signature are taken, the mean value of the total n is multiplied by 16 amplitude value is figured out. The look-up table is queried to obtain the noise estimation coefficient C, then the noise estimation value I< 0 > is figured out; (d) the front detection threshold is obtained by the noise estimation value I< 0 > and a front detection threshold of signal-to-noise ratio meaning.

Description

technical field [0001] The present invention relates to a code division multiple access (CDMA: Code-Division Multiple-Access) communication system, in particular to a code division multiple access system random access preamble detection threshold acquisition method. Background technique [0002] In the Wideband Code Division Multiple Access (WCDMA) mobile communication system, the Physical Layer Random Access Channel (PRACH) is a very important part of the system. UE (User Equipment, user equipment, terminal equipment in the WCDMA system) needs to initiate a random access process through the PRACH when registering in a cell and calling after registration. [0003] In the random access process, the UE randomly selects subchannels and signatures from the available signature set and available subchannel set obtained through broadcasting, and sends a random access preamble consisting of the selected signature sequence at the time corresponding to the selected subchannel. On the...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04Q7/38H04J13/00H04B1/707H04W74/08
CPCY02D30/70
Inventor 沈伟丁杰伟王艳清
Owner ZTE CORP
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