CAJ | 학술논문

针对对流层散射信道下的通信存在信号微弱和多变的问题,采用 MIMO-OFDM 技术能够有效解决。论文分析了对流层散射信道的突出特性,建立了散射信道模型；在 MIMO-OFDM系统模型基础上,结合实际进行了参数选取,搭建了散射信道下 MIMO-OFDM 系统实验平台；在验证散射信道下 MIMO-OFDM 系统性能的基础上,对不同传输速率和不同调制方式在同一散射信道下的系统性能进行了仿真分析。仿真结果表明,MIMO-OFDM 在高速率信号传输情况下带来的信道容量的提升是明显的,在满足系统 BER 要求前提下,能够实现高速率散射通信；在高速率传输时,64QAM 调制更加有利于降低散射通信中的 BER,而 BPSK、QPSK 和16QAM 调制方式差别不大。该仿真为散射通信设备中多速率多体制调制解调器设计与优化提供了思路,为实现大容量高可靠度散射通信提供了方向指导。
침대대류층산사신도하적통신존재신호미약화다변적문제,채용 MIMO-OFDM 기술능구유효해결。논문분석료대류층산사신도적돌출특성,건립료산사신도모형；재 MIMO-OFDM계통모형기출상,결합실제진행료삼수선취,탑건료산사신도하 MIMO-OFDM 계통실험평태；재험증산사신도하 MIMO-OFDM 계통성능적기출상,대불동전수속솔화불동조제방식재동일산사신도하적계통성능진행료방진분석。방진결과표명,MIMO-OFDM 재고속솔신호전수정황하대래적신도용량적제승시명현적,재만족계통 BER 요구전제하,능구실현고속솔산사통신；재고속솔전수시,64QAM 조제경가유리우강저산사통신중적 BER,이 BPSK、QPSK 화16QAM 조제방식차별불대。해방진위산사통신설비중다속솔다체제조제해조기설계여우화제공료사로,위실현대용량고가고도산사통신제공료방향지도。
The communication problem of weak and variable signal in troposcatter channel can be effectively solved using MIMO-OFDM technology.This paper analyzes the troposcatter channel characteristics and builds a scattering channel model.Then based on the MIMO-OFDM system model,combined with the ac-tual situation,the parameters are selected and the experimental platform of the MIMO-OFDM system in scattering channel is established.And then under the promise of verification of performance of MIMO-OFDM system,the different transmission rate and different modulation system performance in the same scattering channel are simulated and analyzed.The simulation results show that,the communication capac-ity increase brought by MIMO-OFDM is obvious and on the premise of meeting the BER requirements,it can realize high speed scattering communication.And they also show than in the high speed transmission, 64QAM modulation is more conductive to reduce BER in scatter communication,meanwhile BPSK,QPSK and 1 6QAM modulation have little difference.The simulation provides a way for design and optimization of scattering equipment,which has multi rare and multi modem.It provides direction for the realization of large capacity and high reliability scattering communication.