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Downlink data transmission for high-speed trains in 5G communication systems
IET Communications ( IF 1.6 ) Pub Date : 2020-11-17 , DOI: 10.1049/iet-com.2020.0123
Vahid Vahidi 1 , Ebrahim Saberinia 2
Affiliation  

In this study, a new transmitter–receiver approach for high-speed train (HST) downlink orthogonal frequency division multiplexing (OFDM) data transmission and detection in fifth generation (5G) communication systems is proposed. The proposed method uses a new Doppler shift frequency (DSF) estimation method, proposed in this study, to calculate the channel tap DSFs at the HST receiver. These estimated DSFs are used to calculate the channel taps’ angle of departure (AoD). Using the projected AoDs, the transmitter beamformer adjusts its coefficients to suppress the non-line-of-sight (NLoS) channel taps and a DSF compensation block is used to mitigate the line-of-sight channel tap DSF. Simulation results indicate the fidelity of the proposed DSF estimation method and the proposed transmitter–receiver approach. Due to the accuracy of the proposed DSF estimation method and the effectiveness of the beamformer in suppressing the NLoS channel taps, the approach of using a classic digital modulation and demodulation method instead of the OFDM scheme is appraised. Simulation results indicate that this shift from the OFDM modulation to the classic modulation results in a data detection approach which has acceptable accuracy, low computational complexity, and high spectral efficiency.

中文翻译:

5G通信系统中高速火车的下行链路数据传输

在这项研究中,提出了一种新的收发器方法,用于第五代(5G)通信系统中的高速列车(HST)下行链路正交频分复用(OFDM)数据传输和检测。该方法使用了本研究中提出的一种新的多普勒频移(DSF)估计方法来计算HST接收机处的信道抽头DSF。这些估计的DSF用于计算通道抽头的偏离角(AoD)。使用投影的AoD,发射机波束形成器调整其系数以抑制非视距(NLoS)通道抽头,并且使用DSF补偿模块来减轻视距通道的抽头DSF。仿真结果表明了所提出的DSF估计方法和所提出的发射机-接收机方法的保真度。由于所提出的DSF估计方法的准确性以及波束形成器在抑制NLoS信道抽头方面的有效性,因此提出了一种使用经典的数字调制和解调方法代替OFDM方案的方法。仿真结果表明,这种从OFDM调制到经典调制的转变导致了一种数据检测方法,该方法具有可接受的精度,较低的计算复杂度和较高的频谱效率。
更新日期:2020-11-21
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