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Data transmission method and system actively utilizing multipath effect

A technology of data transmission system and multipath effect, which is applied in the direction of transmission system, phase modulation carrier system, electrical components, etc., can solve the problem of eliminating multipath effect, achieve the elimination of multi-carrier intermodulation interference phenomenon, and accurately estimate channel parameters and robustness, overall volumetric weight reduction effect

Active Publication Date: 2022-02-22
西安英诺视通科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with the Link16 terminal that needs to transmit 200W, it produces a power loss of 133.3 times, that is, a link loss of 21.25dB
This shows that Link16 did not take good measures to eliminate multipath effects

Method used

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  • Data transmission method and system actively utilizing multipath effect
  • Data transmission method and system actively utilizing multipath effect
  • Data transmission method and system actively utilizing multipath effect

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] [Example 1] For an application scenario where the maximum multipath delay is 6 μs, a data transmission system with a net transmission rate of 2.08 Mbps is designed. Let the number of FDM channels M=4; the symbol rate of each signal is 1.024Msps, the sampling rate is 3 samples / symbol, that is, each channel is 3.072M samples / second, and the total sampling frequency of the FDM signal is 12.288MHz. Modulation method QPSK. The synchronization code adopts the length L c =127 m sequence, each chip is represented as 1 QPSK symbol vector value, obtains s (1: L c ), where s(n)=1+j or -1-j. information symbol sequence x 1 (1:N) and x 2 (1:N) length N=256; the length of the cyclic prefix is ​​L d =25, the packet error correction code adopts (512, 384) RS code.

[0065] Convert the input information of 2.08Mbps rate into 4 channels, each channel rate is 520Kbps, each channel takes 384 bits each time as a frame, after RS ​​(512, 384) coding, it is mapped to 256 QPSK symbols ge...

Embodiment 2

[0072] [Embodiment 2] The system structure and parameters are basically the same as those in the embodiment, except that the transmitting end adopts a method based on spatial power combination for the transmission mode of the 4-way FDM signal. The system structure and signal processing method and steps of the relevant part of the transmitter are as follows:

[0073] (1) Each of the M FDM channels at the transmitting end corresponds to a baseband signal processing module, a quadrature modulator, and a set of radio frequency signal amplifiers including a power amplifier; a power combiner is used to perform M channel radio frequency signals of different frequency bands Spatial power combining, coupled to the same antenna for transmission.

[0074] (2) If the central frequency of the radio frequency signal is 5.8GHz, then the power combiner adopts waveguide design and realizes, and adopts a two-stage bifurcated structure, the first level is two two-in-one combiners, and the second...

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Abstract

The invention discloses a data transmission method and system which actively utilizes the multipath effect, and is used for solving the problem of intersymbol interference caused by the multipath effect in broadband wireless communication. When the volume, weight, power consumption, antenna gain, and communication bandwidth of the communication terminal are limited, serious multipath effects occur, and the MIMO-OFDM technology and spread-spectrum-based Rake receiving technology cannot be used to solve the problem. The present invention can realize high-speed data reliable transmission. Because FDM reduces the symbol rate of each channel several times, the frame structure with cyclic prefix and cyclic suffix can absorb long two-way intersymbol interference, so the maximum multipath delay difference allowed by the system can adapt to many important applications. Based on multiple rounds of partial symbol judgment, reconstructed signal cancellation, and minimum mean square error frequency-domain equalization method for re-detection of remaining symbols, the system can achieve a bit error rate lower than the decoding threshold under the worst channel conditions, and a chain link when transmitting 2Mbps. The path characteristics can be close to free space propagation.

Description

technical field [0001] The invention belongs to the technical field of communication and relates to data transmission, in particular to a data transmission method actively utilizing multipath effects and a wireless communication system formed therefrom, which are applied to broadband wireless communication, scattering communication and ground-air communication. Background technique [0002] The biggest obstacle to the development of broadband wireless communication is the multipath effect. In addition to line-of-sight (LOS) transmission, electromagnetic waves have many reflection and refraction paths, and their strength may be very strong; the maximum distance difference between these transmission paths may reach several Hundreds of meters or even thousands of meters, the corresponding transmission delay difference is thousands of times of the radio frequency carrier period; therefore, when they are transmitted to the receiving end and added, the signal at each moment is rand...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/04H04B1/16H04L27/20H04L27/22
CPCH04B1/04H04B1/16H04L27/20H04L27/22
Inventor 易鸿锋杨宝林张方
Owner 西安英诺视通科技有限公司
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