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

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...

AI Technical Summary

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 filter out the random access preamble whose correlation peak value becomes lower due to the influence of noise, resulting in an increase in the probability of missed detection.

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