A cofdm modulation and demodulation method for aircraft
A modulation method and aircraft technology, which are applied in the field of COFDM modulation and demodulation for aircraft, can solve the problems of not being able to support real-time requirements well, weak anti-Doppler frequency shift and frequency spreading capabilities, and large transmission delay, etc. Achieve the effect of reducing algorithm complexity, reducing peak-to-average ratio, and reducing transmission delay
Active Publication Date: 2019-05-21
西安烽火电子科技有限责任公司
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Problems solved by technology
IEEE802.16 communication system and DVB-T communication system adopt a longer symbol length, so their ability to resist multipath delay extension exceeds 10μs, but their ability to resist Doppler frequency shift and frequency extension is less than 10μs. Weak, so it is only suitable for use on the ground, and the DVB-T communication system has a large transmission delay caused by codec, interleaving / deinterleaving, synchronization, channel estimation and equalization, and cannot well support high real-time requirements Business
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[0031] The present invention will be further described below in conjunction with accompanying drawing:
[0032] refer to figure 1 , is a schematic diagram of the principle of a COFDM modulation and demodulation method for aircraft of the present invention. The COFDM modulation and demodulation method for aircraft includes a COFDM modulation method for aircraft and a COFDM demodulation method for aircraft.
[0033] Above-mentioned aircraft COFDM modulation method comprises the following steps:
[0034] Obtain the digital baseband signal; divide the digital baseband signal into multiple signals; perform scrambling processing, RS coding processing, convolutional coding processing, and interleaving processing on each signal in sequence to obtain corresponding interleaved data.
[0035] Specifically, the hardware basis of the embodiment of the present invention includes data terminal equipment (DTE, Data Terminal Equipment) and data circuit-terminating equipment (DCE, Data Circui...
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The invention belongs to the technical field of airborne broadband modulation and demodulation, in particular to a COFDM modulation and demodulation method for aircraft. The aircraft COFDM modulation method comprises the following steps: obtaining a digital baseband signal; dividing the digital baseband signal into multiple signals; performing scrambling processing, RS coding processing, convolutional coding processing, and interleaving processing on each signal in sequence, and obtaining The corresponding interleaved data; each interleaved data is subjected to OFDM time-domain differential modulation to obtain the corresponding OFDM symbol; each OFDM symbol is subjected to Fourier inverse transform to obtain the corresponding time-domain OFDM symbol data; at each time The front end of domain OFDM symbol data is inserted into the cyclic prefix and preamble training sequence to obtain the transmitted data; the pulse waveform to be transmitted is obtained, and the pulse waveform to be transmitted is stored; when the signal transmission instruction from the MAC layer is received, the stored pulse waveform is used to The carrier is modulated for transmission.
Description
technical field [0001] The invention belongs to the technical field of airborne broadband modulation and demodulation, and particularly relates to a COFDM (codedorthogonal frequency division multiplexing, coded orthogonal frequency division multiplexing) modulation and demodulation method for aircraft. 1. Air-ground channel, that is, a modulation and demodulation method that achieves higher transmission rate and lower transmission delay in a high-speed fading multipath channel, especially suitable for a large number of air and ground nodes that need self-organization Applications for networking and supporting multimedia services such as voice, data, image and video. Background technique [0002] A typical air-air channel is approximately a Doppler Rice channel, and the maximum moving speed of a node can reach 2.6 times the speed of sound, while a typical air-ground channel is approximately a Doppler multipath fading channel, and the maximum moving speed of a node is The spe...
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IPC IPC(8): H04L27/26
CPCH04L27/2627H04L5/0044
Inventor 张亦希王陈春陈晨马纲王业芳王蕴仇妙月
Owner 西安烽火电子科技有限责任公司