A Realization Method of Airborne Broadband Burst c-ofdm System
A technology of C-OFDM and an implementation method, which is applied in the implementation field of airborne broadband burst C-OFDM system, can solve the problems of reducing the complexity, volume and weight of radio stations, and being more sensitive to time-variation of frequency deviation channels, so as to meet the requirements of anti-multiple path fading, low transmission delay, and the effect of reducing complexity
Active Publication Date: 2018-10-19
陕西西北工业技术研究院有限责任公司
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Problems solved by technology
The advantages of C-OFDM technology include: (1) By using the cyclic prefix, it can effectively combat the intersymbol interference caused by the multipath effect; (2) By using the IFFT / FFT algorithm, it can effectively reduce the complexity, power consumption, Volume and weight; (3) By using coding technology, it can effectively resist the frequency selective fading caused by multipath effect, and the disadvantages include: (1) Since the information is transmitted in parallel on each subcarrier, it has a large Peak-to-average ratio; (2) Sensitive to frequency deviation and time-varying channel
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[0025] Such as figure 1 The realization method of a kind of airborne broadband burst C-OFDM system shown, comprises the following steps:
[0026] Step 1. Modulation: mapping the coded data into complex data symbols;
[0027] Step 2. Pre-transmission: perform IFFT transformation on the mapped data symbols, and insert a cyclic prefix, then store in the memory, and immediately modulate and transmit the radio frequency carrier after the MAC layer entity sends the instruction;
[0028] Step 3, symbol synchronization: determine the position of the FFT block;
[0029] Step 4, frequency offset estimation; estimate and correct the carrier frequency offset between the sending and receiving signals;
[0030] Step 5, channel estimation and equalization: estimate the amplitude and phase of the channel, and correct it according to the estimation result;
[0031] Step 6, demodulation: mapping complex data symbols into data before channel decoding.
[0032] The data burst used in steps 1 ...
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Disclosed in the invention is a realization method of an airborne burst coded orthogonal frequency division multiplexing (C-OFDM) system. The realization method comprises the following steps: step one, modulation; step two, emission in advance; to be specific, carrying out IFFT conversion on a modulated data symbol, inserting cyclic prefixes, storing the information in a storage unit, and carrying out modulation and emission immediately after instruction sending by an MAC layer entity; step three, symbol synchronization; to be specific, FFT block position determination; step four, frequency offset estimation; step five, channel estimation and balance; and step six, demodulation. The employed data burst includes a training sequence portion and a data transmission portion; the training sequence portion is in front of the data transmission portion and includes two continuous different training sequences and one cyclic prefix is arranged in front of each training sequence; and the data transmission portion behind the training sequence portion includes a plurality of continuous FFT blocks. According to the invention, the steps are simple, the design is reasonable, the method can be realized conveniently; the using effect is good; a high transmission rate and a low transmission delay are realized; and the complexity of the C-OFDM system is effectively reduced.
Description
technical field [0001] The invention belongs to the technical field of wireless transmission of an airborne broadband self-organizing network, and in particular relates to a method for realizing an airborne broadband burst C-OFDM system. Background technique [0002] The airborne broadband burst C-OFDM system is mainly used to realize various medium and low-altitude aircraft, such as: helicopters, attack aircraft and unmanned aircraft, as well as between these aircraft and ground vehicles, and personnel. Multimedia, networking Communication. Therefore, the airborne broadband burst C-OFDM system needs to achieve higher transmission rate and lower transmission delay in air-air and air-ground channels. [0003] At present, the transmission technologies that can achieve higher transmission rates in the air-air and air-ground channels mainly include: Time Domain Equalization (TDE), Single Carrier Frequency Domain Equalization (Single Carrier Frequency Domain Equalization, SC-FDE...
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IPC IPC(8): H04L27/26H04L5/00
CPCH04L27/20H04L27/22H04L27/2628H04L27/2657H04L27/2662
Inventor 张亦希赵玉亭赵玉龙
Owner 陕西西北工业技术研究院有限责任公司