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High-order constant-envelope coded modulation method applied to unmanned aerial vehicle data link

A coding modulation and constant envelope technology, applied in the communication field, achieves excellent performance, high frequency band utilization, and excellent error correction performance

Inactive Publication Date: 2017-08-04
北京银河信通科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the check matrix designed in this way does not satisfy the above conditions

Method used

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  • High-order constant-envelope coded modulation method applied to unmanned aerial vehicle data link
  • High-order constant-envelope coded modulation method applied to unmanned aerial vehicle data link
  • High-order constant-envelope coded modulation method applied to unmanned aerial vehicle data link

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Step 1, the construction satisfies Q 2 Check matrix of LDPC codes with PSK modulation constant envelope constraints.

[0037] Assume that the encoded codeword is c=(c 1 ,c 2 ,... c n ) T , the code length is n and is a multiple of 4, in order to satisfy the constraint of the constant envelope, the codeword after encoding the four signals needs to satisfy

[0038] c 4k+1 +c 4k+2 +c 4k+3 +c 4k+4 =1 k=0,1,...,n / 4-1 (3)

[0039] Construct the check matrix as follows

[0040]

[0041]Wherein n is the code word length after encoding and is a multiple of 4, and the condition that H needs to satisfy is then: divide it into left and right parts, namely H=[A B], and the B matrix should satisfy the reversible condition. h random is a random sparse matrix, E n / 4×n It is a matrix with 4 consecutive 1s in each row and 1 1 in each column, which can be expressed as (column replacement is possible):

[0042]

[0043] Different from the general verification relationshi...

Embodiment 2

[0052] Step 1, the construction satisfies Q 2 Check matrix of LDPC codes with PSK modulation constant envelope constraints.

[0053] Assume that the encoded codeword is c=(c 1 ,c 2 ,... c n ) T , the code length is n and is a multiple of 4, in order to satisfy the constraint of the constant envelope, the codeword after encoding the four signals needs to satisfy

[0054] c 4k+1 +c 4k+2 +c 4k+3 +c 4k+4 =1 k=0,1,...,n / 4-1 (3)

[0055] Construct the check matrix as follows

[0056]

[0057] Wherein n is the code word length after encoding and is a multiple of 4, and the condition that H needs to satisfy is then: divide it into left and right parts, namely H=[A B], and the B matrix should satisfy the reversible condition. h random is a random sparse matrix, E n / 4×n It is a matrix with 4 consecutive 1s in each row and 1 1 in each column, which can be expressed as (column replacement is possible):

[0058]

[0059] Different from the general verification relationsh...

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Abstract

The invention relates to a high-order constant-envelope coded modulation method applied to an unmanned aerial vehicle data link, and belongs to the technical field of communication. The method comprises the following steps: constructing a check matrix H satisfying a constant envelope constraint, and performing a calculation according to a relationship between check matrixes and generated matrixes to obtain a generated matrix G; multiplying a code element u needing to be transmitted with the generated matrix G to obtain a transmission code word c; and performing serial-parallel conversion on the transmission code word c, and transmitting an encoded code word into a Q<2>PSK modulator for modulation. Compared with the prior art, the high-order constant-envelope coded modulation method has the advantages that a low-density parity check (LDPC) code with excellent error-correcting performance can be designed under the condition of satisfying the constant envelope constraint, and the performance is more excellent when a code length is larger; the transmission requirement of a large data volume in an unmanned aerial vehicle data link environment can be met, and a relatively high frequency band utilization ratio is achieved; and reliable data transmission in an environment with a relatively low signal-to-noise ratio is satisfied.

Description

technical field [0001] The invention relates to a high-order constant envelope coding modulation method applied to an unmanned aerial vehicle data link, and belongs to the technical field of communication. Background technique [0002] With the continuous improvement of remote sensing technology, UAV has become a research hotspot in recent years. Such as figure 1 As shown, the UAV data link is the key to realize the information transmission between the UAV airborne data terminal and the ground command and control station, and it is a two-way communication link. Among them, the uplink mainly transmits remote control instructions from the ground station to the UAV; the downlink mainly transmits telemetry image data, tracking and positioning data, and UAV status parameters from the UAV to the ground station, which are mostly suitable for remote real-time monitoring of the battlefield and telemetry. The amount of data transmitted by the downlink is much higher than that of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04L27/20H04L27/18
CPCH04L1/0063H04L1/0041H04L27/18H04L27/20
Inventor 胡东方李林涛杨凯
Owner 北京银河信通科技有限公司
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