机械与电子
機械與電子
궤계여전자
MACHINERY & ELECTRONICS
2014年
9期
6-9
,共4页
多输入多输出%正交频分复用%空时分组码%Matlab
多輸入多輸齣%正交頻分複用%空時分組碼%Matlab
다수입다수출%정교빈분복용%공시분조마%Matlab
multiple inputmultiple output%orthogonal frequency divisionmultiplexing%space
针对空时编码不能直接应用于非平坦衰落信道的问题。提出了将正交频分复用（OFDM ）与多输入多输出系统（MIMO）相结合的方案。建立了 OFDM STC 系统模型。OFDM 系统通过把信息分散到许多载波上，降低了各子载波的信号速率，使符号周期比多径迟延长，从而能够减弱多径传播的影响。利用 Matlab 软件对各系统的性能进行了仿真，仿真结果表明，结合后的 OFDM STBC系统较传统的 STBC 系统，可靠性获得了提升。
針對空時編碼不能直接應用于非平坦衰落信道的問題。提齣瞭將正交頻分複用（OFDM ）與多輸入多輸齣繫統（MIMO）相結閤的方案。建立瞭 OFDM STC 繫統模型。OFDM 繫統通過把信息分散到許多載波上，降低瞭各子載波的信號速率，使符號週期比多徑遲延長，從而能夠減弱多徑傳播的影響。利用 Matlab 軟件對各繫統的性能進行瞭倣真，倣真結果錶明，結閤後的 OFDM STBC繫統較傳統的 STBC 繫統，可靠性穫得瞭提升。
침대공시편마불능직접응용우비평탄쇠락신도적문제。제출료장정교빈분복용（OFDM ）여다수입다수출계통（MIMO）상결합적방안。건립료 OFDM STC 계통모형。OFDM 계통통과파신식분산도허다재파상，강저료각자재파적신호속솔，사부호주기비다경지연장，종이능구감약다경전파적영향。이용 Matlab 연건대각계통적성능진행료방진，방진결과표명，결합후적 OFDM STBC계통교전통적 STBC 계통，가고성획득료제승。
According to the problem that Space time coding can not be directly applied to a flat fa-ding channel.The scheme of combining OFDM with MIMO was put forward. The model of OFDM STBC system was established.Informa-tion was distributed to many carrierin OFDM sys-tem,the sub carrier signal rate was reduced greatly,the symbol period was later than mul-tipath extension,in order to weaken the effects of multipath propagation.And the system perfor-mancewas simulated by using Matlab software,the simulation results show that reliability promotion ofthe OFDM STBC system was improved greatly than the traditional STBC system.
