Multi-user detection method based on ZC sequence

A multi-user detection and detection method technology, which is applied in the field of uplink random access, can solve problems such as energy leakage and false alarm probability increase

Inactive Publication Date: 2014-07-16
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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AI Technical Summary

Problems solved by technology

When the Doppler frequency shift continues to increase, the energy will leak out of the detection window, resulting in an increase in the probability of false alarms

Method used

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  • Multi-user detection method based on ZC sequence
  • Multi-user detection method based on ZC sequence
  • Multi-user detection method based on ZC sequence

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specific Embodiment approach

[0063] Step 1: Generate the basic ZC sequence.

[0064] In high-speed scenes, use the ZC sequence of format 0-3 and length Nzc=839, through ud u = m·N ZC +1, m≥1 and Get the root serial number u that satisfies the condition, according to 0≤n≤N ZC -1 for a ZC sequence of 839 points.

[0065] Step 2: Generate a cyclically shifted ZC sequence.

[0066] The new cyclic shift formula is: Cv=(2n-1)*dmax+(n-1)*N cs n=1,2,...N, the new cyclic shift formula can ensure that the offset position of the correlation peak will not fall into the adjacent detection window. The resulting cyclic shift Cv value according to x u，v (n)=x u ((n+C v ) mod N ZC ) to get x u，v (n) As a ZC sequence that can support a maximum number of users of N.

[0067] Step 3: Send the preamble and receive the preamble.

[0068] After receiving and demapping the carrier to obtain the frequency domain signal Y(k), then IDFT to the time domain to obtain y(n), and then with the ZC local root sequence x in ...

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Abstract

The invention provides a multi-user detection method based on a ZC (Zadoff-Chu) sequence. The multi-user detection method based on the ZC sequence is applicable to the situation of a high speed. The multi-user detection method is an improvement of a ZC sequence multi-user detection method using three joint detection windows in an LTE high-speed scene. The multi-user detection method comprises the steps that a specific ZC sequence root serial number is selected to generate the ZC sequence, related peak values in a Doppler environment can shift to centralize within the detection range of a single detection window through the specific ZC sequence root serial number, and therefore multi-user detection can be carried out through the single detection window at the detection end. According to the multi-user detection method based on the ZC sequence, the disadvantage that energy of a main window is dispersed by frequency offset can be effectively avoided, and high performance still can be achieved under the conditions of high speed and high frequency offset.

Description

technical field [0001] The invention belongs to the uplink random access technology in SC-FDMA (Single-carrier Frequency-Division Multiple Access) system, and in particular relates to a multi-user detection method under high speed and high Doppler frequency deviation. Background technique [0002] 3GPP LTE is an SC-FDMA multiple access technology based on OFDM technology for uplink data transmission. Through the random access process, the base station can detect the user who initiates the access and estimate its transmission delay and signal power. The physical layer random access preamble is used to distinguish different user equipments to establish communication links. The random access preamble is generated by one or more Zadoff-Chu (ZC) sequences and their cyclic shifts. [0003] In LTE multi-user detection, an unrestricted set and a restricted set are used to generate cyclic shifts in normal scenarios and high-speed scenarios respectively, and then preamble sequences ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W74/08
Inventor 胡苏袁航郭伟李少谦
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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