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COFDM uplink enhancement method applied to aerial photography and monitoring

An aerial photography and solution technology, applied in the field of aerial photography, can solve the problems of noise, uplink interference, and consume a lot of manpower and material resources, and achieve the effect of enhancing error correction capability, high throughput requirements, and improving stability

Inactive Publication Date: 2019-07-09
无锡远传融创科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] However, the introduction of multi-stage PAs and LNAs has led to a significant increase in the complexity of the RF module, and at the same time, it is easy to introduce noise, which increases the instability of the system. In addition, the RF transmission power of wireless devices has strict specifications; Large manpower and material resources, the COFDM system may be in a mobile state, and the system will not work in a fixed area, so the frequency scanning scheme cannot solve the interference problem of the uplink; the uplink and downlink use the same channel bandwidth and coding modulation method , the stability of the uplink cannot be guaranteed

Method used

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  • COFDM uplink enhancement method applied to aerial photography and monitoring
  • COFDM uplink enhancement method applied to aerial photography and monitoring
  • COFDM uplink enhancement method applied to aerial photography and monitoring

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Embodiment Construction

[0026] The present invention will be further described below in conjunction with the accompanying drawings.

[0027] as attached Figures 1 to 4 The COFDM uplink enhancement method applied to aerial photography and monitoring includes adopting asymmetric channel working bandwidth for uplink and downlink, wherein the downlink channel adopts wide working bandwidth, and the uplink channel adopts narrow working bandwidth. The COFDM system used in the field of unmanned aerial photography and intelligent robots mainly realizes downlink high-definition digital wireless video transmission, which has high requirements for downlink bandwidth; the uplink is usually a control and data transmission channel, and has low requirements for uplink bandwidth. After flexible configuration according to the application scenario, the sensitivity and noise detection capability of the uplink can be effectively improved, and the SNR of the uplink can be improved. Sensitivity calculation formula: Sen(d...

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Abstract

The invention discloses a COFDM (Coded Orthogonal Frequency Division Multiplexing) uplink enhancement method applied to aerial photography and monitoring. The COFDM uplink enhancement method comprisesthe following steps that: an uplink and a downlink adopt asymmetric modulation and coding, and are matched with an LDPC coding system; the purpose of interference diversity is achieved by using a frequency hopping technology; and carrying out uplink space diversity by adopting an uplink double-antenna switching technology. According to the COFDM uplink enhancement method applied to aerial photography and monitoring, uplink interference can be restrained, and an uplink is stabilized.

Description

technical field [0001] The invention relates to the field of aerial photography, in particular to a COFDM uplink enhancement method applied to aerial photography and monitoring. Background technique [0002] With the rapid development of international communication technology, COFDM modulation technology has also emerged, which has made great progress in realizing high-quality real-time image and data transmission in "high-speed motion" and "under non-line-of-sight conditions". The wireless digital image transmission system adopts advanced OFDM modulation and demodulation technology, channel coding technology, combined with multimedia network transmission technologies such as digital image compression H.264 / H.265, and can realize video, voice, data, etc. Real-time and synchronous transmission of broadband multimedia services. It has significant advantages such as wide coverage, high sensitivity, good mobility, strong anti-interference and anti-fading capabilities, high tran...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/18H04N21/2383H04N21/2385H04B7/185H04B1/715H04L1/00H04L27/32H04B7/08
CPCH04B1/715H04B7/0814H04B7/18506H04B2001/7152H04L1/004H04L1/0061H04L27/32H04N7/18H04N21/2383H04N21/2385
Inventor 李焱陈健
Owner 无锡远传融创科技有限公司
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