摘要
针对多输入多输出变换域通信系统(MIMO-TDCS)存在频谱利用率低的问题,基于OFDM系统所使用的FFT/IFFT数据调制解调思想,提出了一种在频域上对TDCS符号进行多数据符号加载的系统。理论上系统能够在一个TDCS符号上传输多个数据符号,能有效地提高频带利用率,并且解调过程运用FFT变换可简化解调结构的复杂度。通过仿真分析,验证了在符号传输功率一定并保证一定误码率性能的条件下,基于OFDM的MIMO-TDCS能够有效提高频谱利用率。
Aiming at the lower spectrum usage at conventional MIMO-TDCS, the paper presents a modulation method of MI- MO-TDCS based on OFDM which utilize FFT/IFFF technology to modulate data in spectrum domain. It transmit multiple data sym- bols by one TDCS symbol and improve spectral efficiency. Because of using demodulation method based on FFT, it make demodu- lation more briefly. The simulative results show that in fixed transmit symbol power and under proper BER performance limit MI- MO-TDCS based on OFDM is a way that can enhance spectral efficiency availably.
出处
《电子技术应用》
北大核心
2012年第11期122-125,共4页
Application of Electronic Technique
基金
国家自然科学基金资助项目(60972042)
