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Method for generating ZC sequence of frequency domain and random access method based on ZC sequence

A random access and sequence technology, applied in multi-frequency code systems, wireless communications, electrical components, etc., can solve the problems of ZC sequence discussion, failure to make full use of ZC sequences, etc., to simplify computational complexity and maximize flexible configuration. , the effect of simplifying the processing flow

Active Publication Date: 2012-02-01
POTEVIO INFORMATION TECH
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Problems solved by technology

However, this method only focuses on minimizing the interference between ZC sequences of different lengths, and does not discuss ZC sequences in correlated reception and similar scenarios.
[0008] From the above analysis, it can be seen that the existing technology fails to make full use of the properties of the ZC sequence, so that other applications based on the ZC sequence (such as: random access scheme) are not simplified

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  • Method for generating ZC sequence of frequency domain and random access method based on ZC sequence
  • Method for generating ZC sequence of frequency domain and random access method based on ZC sequence
  • Method for generating ZC sequence of frequency domain and random access method based on ZC sequence

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Embodiment Construction

[0053] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and examples.

[0054] figure 1 It is a schematic diagram of a processing flow principle of an existing random access scheme. next to figure 1 A brief description of the processing performed by each module:

[0055] The sending end includes modules 1 to 5, where:

[0056] Module 1 is used to generate N zc Point time domain ZC sequence, which is called the original time domain ZC sequence;

[0057] Module 2 is used to cyclically shift the original time-domain ZC sequence;

[0058] Module 3 is used to perform DFT transformation on the time domain ZC sequence obtained after the cyclic shift, and transform it into the frequency domain;

[0059] Module 4 is used to map the frequency domain ZC sequence obtained after DFT transformation to N seq Point frequency domain ...

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Abstract

The invention provides a random access method based on a ZadOff-Chu (ZC) sequence. According to the random access method, when a time domain ZC sequence that satisfies a target sampling rate is generated at a sending terminal, a simplified deformation form of a frequency domain ZC sequence is directly generated; and then a time ZC sequence that satisfies a target sampling rate is generated according to the simplified deformation form of the frequency domain ZC sequence, so that a processing flow and a calculating complexity of a random access sending terminal are simplified; moreover, when a receiving terminal carries out random access detection and timing estimation, a local frequency domain ZC sequence is generated with regard to a scheme in which correlated calculation is carried out by employing a frequency domain method; and meanwhile, a common factor is moved after an IDFT conversion or the public factor can be replaced by an arbitrary non-zero constant, so that a processing flow and a calculating complexity of a random access receiving terminal are simplified. In addition, the invention also provides a method for generating a frequency domain ZC sequence. According to the invention, a calculating complexity of a ZC sequence can be reduced; and a processing flow and a calculating complexity of any technical scheme employing the ZC sequence in a communication system can be reduced.

Description

technical field [0001] The invention relates to wireless communication system technology, in particular to a method for generating ZC sequences in frequency domain and a random access method based on ZC sequences. Background technique [0002] In a wireless communication system, initial access of a device is accomplished through random access. The system detects whether there is a user through a random access channel, and if there is a user, it performs timing estimation. Detection and estimation are two very important issues in the random access channel. The ZC (ZadOff-Chu) sequence has ideal autocorrelation characteristics, so the ZC sequence in the time domain can be cyclically shifted according to the application scenario, and the detection area can be defined according to the cyclic shift, which is very useful in wireless communication systems (such as LTE) widely. In the random access scheme, combining the usage scenarios and making full use of the properties of the ...

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Application Information

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IPC IPC(8): H04L27/26H04W74/08
Inventor 梁毅杨晓斌
Owner POTEVIO INFORMATION TECH
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