CAJ | 학술논문

为了满足未来无人机数据链高速数据的高质量传输需求,综合OFDM技术可提高频谱利用率、抗多径干扰的特点和LDPC码高效高性能的优点,本文将LDPC-COFDM作为解决方案应用于无人机通信中.考虑无人机信道的时变多径衰落和强多普勒频移特性,给出了COFDM无人机数据链系统模型,进一步针对无人机飞行状态典型信道参数值,仿真了LDPC-COFDM系统的误码率性能,并与基于卷积码的COFDM系统进行比较,结果表明COFDM可以明显的提高无人机数据链系统的可靠性,此外,LDPC-COFDM系统在较低的信噪比条件下就可以达到很低的误码率,从而有效地节省了无人机发射功率.
위료만족미래무인궤수거련고속수거적고질량전수수구,종합OFDM기술가제고빈보이용솔、항다경간우적특점화LDPC마고효고성능적우점,본문장LDPC-COFDM작위해결방안응용우무인궤통신중.고필무인궤신도적시변다경쇠락화강다보륵빈이특성,급출료COFDM무인궤수거련계통모형,진일보침대무인궤비행상태전형신도삼수치,방진료LDPC-COFDM계통적오마솔성능,병여기우권적마적COFDM계통진행비교,결과표명COFDM가이명현적제고무인궤수거련계통적가고성,차외,LDPC-COFDM계통재교저적신조비조건하취가이체도흔저적오마솔,종이유효지절성료무인궤발사공솔.
In order to meet the requirements of higher data rate and reliability for future UAV (Unmanned Aircraft Vehicle) data link, COFDM (coded OFDM) scheme using LDPC is investigated in this paper, which combined the advantages of OFDM (Orthogonal Fre-quency Division Multiplexing), such as improving spectrum efficiency and resisting multi-path interference, with the high performance of LDPC (Low Density Parity Check Code). Considering a time-varying multi-path fading and strong Doppler shift channel, the sys-tem model of COFDM-based UAV data link is described. Simulations are conducted over a practical UAV channel model to evaluate the performance of LDPC-COFDM. Numerical results indicate that COFDM can obviously promote the reliability of UAV communica-tion system. Besides, the data link using LDPC code can further reduce the BER (Bit Error Rate) so that the transmitting power can be inefficiently saved which is significant for power limited practical high-speed UAV data link.