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首页> 外文期刊>Journal of Electrical and Electronic Engineering >Simulation of the Radio Communication Channel with Unmanned Aerial Vehicle in Urban Conditions
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Simulation of the Radio Communication Channel with Unmanned Aerial Vehicle in Urban Conditions

机译：城市条件下无人机飞行无线通信信道的仿真

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Modern unmanned aerial vehicles (UAVs) are used in many spheres of human activity. In conditions of strong urban development, the radio communication channel with UAV is multi-path, which leads to a significant decrease in the quality of the transfer of useful information. Ensuring reliable and qualitative communication depends on the correct choice of the frequency range and the type of modulation used. Multiposition signals of M-PSK, M-QAM, M-FSK formats are considered. Due to the complexity of the mathematical description of such a radio channel, a computer simulation method was used to obtain the results. A multipath propagation model with a number of beams up to 10 is used. The dependencies of the probability of erroneous reception of information on the parameters of the communication channel are obtained: the signal-to-noise ratio, the number and intensity of the propagation paths. The energy parameters of the radio channel are calculated and the optimal frequency range is estimated from the maximum signal-to-noise ratio. It is indicated that the best in this criterion is the operating frequency range of 2-5 GHz. Calculations showed that the transmission coefficient of the radio channel is unstable and varies greatly in frequency. When using narrow-band signals M-PSK, M-QAM, this can lead to a situation where the signal can get into the "bad" frequency band and the quality of information transfer will decrease significantly. In connection with this, a radio channel with multiposition frequency modulation M-FSK was studied, when the transmission of discrete information is carried out using multiple parcels with different frequencies falling into both "bad" and "good" frequency zones. The results of the study showed that the probability of BER error in some cases improves by times compared to M-PSK and M-QAM. This allows us to talk about the prospects for the M-FSK format. Considering the good performance of this format, further studies are planned in the direction of using M-FSK format signals and their prospective version of M-CPFSK (multi-position frequency modulated signals with a continuous phase) in the considered radio channel with different modulation and positioning indices, in particular CPFSK with modulation indices of 0.5 and 0.75, together with MIMO and OFDM systems. The obtained results can be used in the design of modern and promising UAV-to-ground communication systems.
机译：现代无人飞行器（UAV）被用于人类活动的许多领域。在强大的城市发展条件下，带有无人机的无线电通信信道是多路径的，这导致有用信息的传输质量大大下降。确保可靠和定性的通信取决于正确选择频率范围和使用的调制类型。考虑了M-PSK，M-QAM，M-FSK格式的多位置信号。由于这种无线电信道的数学描述很复杂，因此使用计算机仿真方法来获得结果。使用具有最多10个光束的多径传播模型。获得错误接收信息的概率对通信信道参数的依赖性：信噪比，传播路径的数量和强度。计算无线电信道的能量参数，并根据最大信噪比估算最佳频率范围。据指出，在此标准中最好的是2-5 GHz的工作频率范围。计算表明，无线电信道的传输系数不稳定，并且频率变化很大。当使用窄带信号M-PSK，M-QAM时，可能导致信号进入“不良”频带，并且信息传输的质量将大大降低。与此相关，当使用具有落入“坏”和“好”频率区域的不同频率的多个包裹来执行离散信息的传输时，研究了具有多位置频率调制M-FSK的无线电信道。研究结果表明，与M-PSK和M-QAM相比，在某些情况下BER错误的概率会提高。这使我们可以谈论M-FSK格式的前景。考虑到该格式的良好性能，计划在考虑使用不同调制的无线电信道中使用M-FSK格式信号及其预期版本M-CPFSK（具有连续相位的多位置频率调制信号）的方向进行进一步研究定位指标，尤其是调制指数为0.5和0.75的CPFSK，以及MIMO和OFDM系统。所得结果可用于现代和有希望的无人机对地通信系统的设计。

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