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Demodulation reference signal mode setting method for LTE-V2X system

A demodulation reference signal, 1.LTE-V2X technology, applied in transmission systems, baseband systems, multi-frequency code systems, etc., can solve problems such as poor performance, achieve fast time-varying channels, and reduce DMRS overhead. effect of overhead

Active Publication Date: 2018-02-06
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the existing DMRS mode of the LTE-V2X system has poor performance in a high-speed mobile environment, and the present invention proposes a new DMRS mode, which is suitable for the high-speed mobile scene of the LTE-V2X system

Method used

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  • Demodulation reference signal mode setting method for LTE-V2X system
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  • Demodulation reference signal mode setting method for LTE-V2X system

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Embodiment

[0040] During the simulation, the signal is the transmission mode under the V2X standard 10MHz bandwidth, where the channel bandwidth is B=10MHz, and the subcarrier spacing is Δf=15KHz. Under the condition of 1 / 3 turbo code rate, DMRS mode 1, mode 2, and mode 3 are used and mode 4, the simulation modulation mode is the BER (bit error rate) curve and the MSE (mean square error) curve of the system under 16QAM, and the mobile channel parameters are shown in Table 2. The channel interpolation algorithm used in the time direction is linear interpolation or spline interpolation, and the channel extrapolation algorithm used is the quadratic exponential smoothing algorithm; the channel estimation method MMSE (minimum mean square error) interpolation used in the frequency domain direction or Kaiser interpolation.

[0041] Table 2

[0042]

[0043] image 3 and Figure 4 Respectively represent the BER curves and MSE curves in different DMRS modes when the linear interpolation in ...

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Abstract

The invention belongs to the wireless communication Internet of vehicles technology field and particularly relates to a demodulation reference signal mode setting method for an LTE-V2X system. According to a frame structure set based on the method, the DMRS interval in the frequency domain direction is 6, and the DMRS interval in the time direction is 1; or the DMRS interval in the frequency domain direction is 6 or 3, the SC-FDM symbol position in the time direction is divided into two portions, including the front portion and the back portion, DMRS are distributed from the initial portions of the front portion and the back portion, and the DMRS interval of each portion is 2. The method is advantaged in that three types of LTE-V2X system demodulation reference signal design modes are proposed, density of demodulation reference signals in the time domain direction is enhanced, relatively high Doppler of a V2X system can be better responded, moreover, the intervals of the demodulation reference signals in the frequency domain direction are enhanced, confrontation to the relatively large time delay is further guaranteed, cost of the DMRS can be reduced to the maximum degree, and thefrequency spectrum utilization rate is improved.

Description

technical field [0001] The invention belongs to the field of wireless communication, and relates to the physical layer design of the Internet of Vehicles in wireless communication, specifically, the mode design based on the demodulation reference signal (DMRS, Demodulation Reference Signal) of the Long Term Evolution System Internet of Vehicles (LTE-V2X) system. Background technique [0002] In recent years, 4G networks have entered the stage of large-scale commercial use. In order to comply with the development trend of explosive data traffic growth, massive device access, and various new services and diverse application scenarios in the future, the fifth-generation mobile communication system (5G) for 2020 and the future ), also known as IMT-2020, has become a global research and development hotspot. Device to Device (D2D, Device to Device) technology, as one of the key wireless technologies of 5G, has also become a current hot research direction. Vehicle networking (V2X),...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02H04L27/26H04L29/08H04W4/40
CPCH04L25/0224H04L27/261H04L67/12
Inventor 刘光辉杜思剑易超韩丰
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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