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Reliable transmission method and device for broadband private network in high-speed mobile channel

A high-speed mobile and high-speed technology, which is applied in transmission systems, digital transmission systems, and multiple uses of transmission paths, can solve problems such as receiver performance degradation, achieve phase ambiguity problems, ensure reliable transmission, and improve demodulation performance. Effect

Active Publication Date: 2018-09-21
HYTERA COMM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the time-domain interval of the pilot resources stipulated in the protocol is already fixed. As the UE’s moving speed increases, such pilot resources are often insufficient to support the receiver to obtain accurate channel state information. Ultimately, due to the limited time-domain pilot resources , the performance of the receiver is severely degraded

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  • Reliable transmission method and device for broadband private network in high-speed mobile channel
  • Reliable transmission method and device for broadband private network in high-speed mobile channel
  • Reliable transmission method and device for broadband private network in high-speed mobile channel

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Embodiment 1

[0072] see figure 1 , this embodiment discloses a transmission method of a broadband private network under a high-speed mobile channel, which is applied to a wireless base station and includes the following steps:

[0073] S101: Receive a radio frequency signal from a user terminal, and analyze the radio frequency signal to obtain a conventional pilot symbol and a high-speed auxiliary pilot symbol;

[0074] Specifically, the user terminal is a transmitter of a broadband terminal or a transmitter of a broadband repeater.

[0075] Preferably, the execution process of S101 is as follows:

[0076] receiving a radio frequency signal from a user terminal, analyzing the radio frequency signal according to the position of a regular pilot symbol specified in the broadband protocol, and extracting a regular pilot symbol;

[0077] Analyzing the radio frequency signal according to the high-speed auxiliary pilot interpolation interval agreed with the user terminal to obtain the puncture ...

Embodiment 2

[0098] see figure 2 , on the basis of Embodiment 1, after S103, it also includes:

[0099] S108: Calculate the coherent cumulative sum of the channel estimation values ​​of the regular pilot symbols and the high-speed auxiliary pilot symbols at each of the subcarrier positions, calculate the frequency deviation estimation value of the high-speed scene, and calculate the frequency deviation according to the frequency of the high-speed scene The bias estimate compensates the radio frequency signal.

[0100] Specifically, the calculation formula of the frequency deviation estimated value of the high-speed scene is:

[0101]

[0102] Among them, f Offset is the estimated value of the frequency deviation of the high-speed scene, in Hz, H is the channel estimation matrix of the pilot symbols, H HS is the channel estimate of the subcarrier position, Indicates the coherent cumulative sum of the channel estimation values ​​of each subcarrier position of the regular pilot symbo...

Embodiment 3

[0105] see image 3 , on the basis of Embodiment 1, after S105, it also includes:

[0106] S109: According to the maximum Doppler frequency shift of the user terminal, the coherence coefficient matrix between the pilot symbols, and the channel estimation value of the pilot symbols, perform multi-order Wiener filter interpolation to obtain the non-pilot symbols channel estimation value, and demodulate the radio frequency signal according to the channel estimation value of the non-pilot symbol.

[0107] Specifically, the execution process of S109 is as follows:

[0108] calculating a coherence matrix between the non-pilot symbols and the pilot symbols according to the maximum Doppler frequency shift of the user terminal and the time interval between the non-pilot symbols and the pilot symbols;

[0109] calculating a Wiener filter coefficient according to the coherence coefficient matrix between the non-pilot symbols and the pilot symbols, the coherence coefficient matrix betwe...

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Abstract

The invention provides a reliable transmission method for broadband private network in a high-speed mobile channel, wherein a user terminal performs puncturing on a subcarrier of a symbol for transmitting data specified by a broadband protocol at a certain pilot interpolation interval, inserts a preset high-speed auxiliary pilot reference sequence, and converts a punctured frequency domain data signal into a radio frequency signal and sends the signal to a radio base station; the radio base station analyzes the radio frequency signal, extracts a conventional pilot symbol and a high-speed auxiliary pilot symbol, and performs accurate channel estimation and frequency offset estimation of the high-speed scene respectively according to the local known conventional pilot reference information and the high-speed auxiliary pilot reference information, which solves the phase blur problem of the frequency offset estimation under the high-speed mobile channel caused by the limitation of the pilot resources in the prior art as well as the problem of the time domain interpolation accuracy of the channel estimation, improves the demodulation performance of the high-speed channel and ensures thereliable transmission of data.

Description

technical field [0001] The present invention relates to the technical field of digital signal processing at the physical layer of wireless communication, and more specifically, to a reliable transmission method and device for a broadband private network under a high-speed mobile channel. Background technique [0002] Broadband LTE is more and more widely used in private network applications due to its advantages such as high spectrum efficiency, low network delay, and support for real-time image transmission. However, private network application scenarios include high-speed train dispatching systems, rail transit dispatching systems, etc. Faced with the harsh wireless communication environment caused by Doppler frequency shift in such a high-speed scenario, the transmission performance of the physical layer uplink shared channel PUSCH is greatly challenged, and it is prone to failure to demodulate data, short-term call drop or even disconnection, which seriously affects Com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L5/00H04L25/02H04L27/00
CPCH04L5/0048H04L25/0224H04L27/0014H04L2027/0026
Inventor 梁尧李鹏辛小枫
Owner HYTERA COMM CORP
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