Method, device and equipment for detecting lead code of random access channel

Abstract

The invention discloses a method, a device and equipment for detecting lead code of random access channel, which are used for reducing the complexity of lead code detection. The method for detecting lead code of random access channel comprises: carrying out multiplication operation equivalent to time domain correlation operation on a lead code to be detected which is acquired from the received signals and any sequence selected as the lead code in the frequency domain to obtain a group of correlation values; confirming the module value of each correlation value and arranging all the module values in a descending order, and extracting the module values with the identical number which are arranged forward according to the numbers of all the sequences which can be selected as the lead code; confirming the judgment variable corresponding to each extracted module value according to all the module values, and detecting that the sequence corresponding to the extracted module value is selected as the lead code when the judgment variable corresponding to the extracted module value is larger than or equal to the confirmed judgment threshold.

Description

technical field [0001] The invention relates to the technical field of mobile communication, in particular to a preamble detection technology of a random access channel. Background technique [0002] The B3G (Beyond Third Generation Mobile Communication) systems widely studied at present are based on OFDMA (Orthogonal Frequency Division Multiple Access) technology or SC-FDMA (Single Carrier-Frequency Division Multiple Access) technology. , single carrier frequency division multiple access) cellular system. In the B3G system, a user who is not fully synchronized with the base station must obtain a unique ID (Identifier, identification), timing adjustment and be allocated a certain time-frequency resource before transmitting uplink data. This process is generally called "asynchronous User random access process", referred to as "random access". [0003] In the B3G system, RACH (Random Access Channel, Random Access Channel) is a group of time-frequency resources, which are ort...

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Problems solved by technology

[0019] It can be seen that in the prior art, method 1 needs to perform a correlation operation on each sequence that can be used as a preamble and the preamble to be detected, and perform preamble detection according to the correlation operation result; and in the detection process, it is necessary to adjust the first sequence according to the SNR Threshold a, implement complex

[0020] Method 2 also needs to correlate each sequence that can be used as a preamble with the preamble to be detected, and perform preamble detection according to the correlation operation results; and in the detection process, it is necessary to estimate the noise variance, which increases the complexity of the processing at the receiving end At the same time, the analysis and simulation in the detection process are all based on the unbiased estimation of the noise variance. If the estimated noise variance is wrong, it will directly affect the accuracy of the second threshold b, resulting in a decrease in the accuracy of preamble detection.

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