Error Control Method Based on Punctured Interleaved Mapping
An error control and interleaver technology, which is applied in the application of forward error control, error prevention, digital transmission system, etc., can solve the problem of increasing technical difficulty of error control, and achieve the effect of convenient implementation, good stability and convenient differentiation.
Active Publication Date: 2018-02-09
TSINGHUA UNIV +1
View PDF5 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
At the same time, affected by the speed, heading and flight attitude of the helicopter, the rotor shielding period and duty cycle are time-varying, and the corresponding deletion position and deletion length are also time-varying, which increases the technical difficulty of error control
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0019] The present invention will be further described below in conjunction with the accompanying drawings.
[0020] The downlink channel of the helicopter satellite can be regarded as a constant parameter channel approximately during the non-occlusion period. However, during the blocking period, the receiving signal of the airborne station will decline sharply, and the signal-to-noise ratio of the receiving signal will decrease sharply. At this time, the demodulation equipment may even lose lock for a short time. During the occlusion period, it can be considered that the probability of outputting codeword 0 or 1 after demodulation is the same, that is, the channel has the lowest degree of credibility at this time, and the information sent by the ground station is deleted by the channel. Since rotor occlusion is periodic, the channel confidence L c It also exhibits cyclical characteristics.
[0021] Based on the above, the confidence distribution of the channel in the i-th r...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses an error control method based on perforated interleaving mapping, and proposes a new method for error control problems when ground stations communicate with helicopters (groups). The method of the present invention includes: the ground station performs error correction coding on the transmitted information, and the puncture interleaver interleaves and maps the error correction coded sequence before transmitting; the airborne station deinterleaves the received data, and obtains the error The encoded data is equivalent to the punctured result of the error correction code sent by the ground station. Interleaving is used to perform equivalent puncture processing on the original error code of the transmitter. The present invention more fully taps the helicopter satellite downlink channel capacity and can effectively solve the error control of helicopter rotor shielding.
Description
technical field [0001] The invention relates to an error control method based on punctured interleaving mapping. Background technique [0002] In the helicopter satellite downlink, when the ground station transmits information to the helicopter (group), the circular motion of the helicopter rotor blades will block the satellite relay signal. During the period of rotor occlusion, the information transmitted by the ground station will usually be deleted. After passing through the helicopter satellite signal under the occlusion of the rotor, there will be a section of continuous data in the data frame that will be deleted. The deleted continuous data is occlusion deletion data. At the same time, affected by the speed, heading and flight attitude of the helicopter, the rotor shielding period and duty cycle are time-varying, and the corresponding deletion position and deletion length are also time-varying, which increases the technical difficulty of error control. Contents of t...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/00
CPCH04L1/0068H04L1/0071H04L1/0072H04B7/18508
Inventor 马正新王毓晗李涛宁永忠
Owner TSINGHUA UNIV