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Data transmission method and system actively utilizing multipath effect

A data transmission method and multipath effect technology, which can be applied to transmission systems, phase-modulated carrier systems, electrical components, etc., and can solve problems such as eliminating multipath effects

Active Publication Date: 2020-08-14
西安英诺视通科技有限公司
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  • Summary
  • 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

[0063] [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.

[0064] 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

[0071] [Embodiment 2] The system structure and parameters are basically the same as those in the embodiment, except that the method for transmitting the 4-way FDM signal at the transmitting end adopts the method based on spatial power synthesis described in claim 4. The system structure and signal processing method and steps of the relevant part of the transmitter are as follows:

[0072] (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.

[0073] (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 co...

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Abstract

The invention discloses a data transmission method and a data transmission system for actively utilizing a multipath effect, which are used for solving the problem of intersymbol interference caused by the multipath effect in broadband wireless communication. When the size, the weight, the power consumption, the antenna gain and the communication bandwidth of the communication terminal are limited, the serious multipath effect occurs, and the MIMO-OFDM technology and the Rake receiving technology based on spread spectrum cannot be used for solving the problem, the reliable transmission of high-speed data can be realized. Due to the fact that the symbol rate of each path is reduced by multiple times through FDM, a frame structure with a cyclic prefix and a cyclic suffix can absorb long bidirectional intersymbol interference, and the maximum multipath delay inequality allowed by the system can adapt to many important application occasions. Based on a mean square error minimum frequency domain equalization method of multiple rounds of partial symbol judgment, reconstruction signal offset and residual symbol detection, the bit error rate of the system under the worst channel conditionis lower than a decoding threshold, and link characteristics during transmission of 2Mbps 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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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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