CAJ | 학술논문

正交频分复用技术将多径衰落信道划分为多个相对平坦的子信道,使得接收机在信道估计等恢复技术上复杂度大大降低.OFDM系统采用子信道联合预编码技术能有效解决由于成片子载波衰落引起的数据丢失问题.由于独立信道的线性预编码技术在发送端不需要信道反馈信息,因此降低了发送设备复杂度,减少了系统延时,该编码方案适用于从用户端到基站的数据传输.通过理论分析推导了当系统采用独立信道的线性预编码技术时,接收端不能采用迫零均衡(ZF)的线性检测算法,实验仿真表明,当采用迫零均衡检测算法时,当且仅当预编码矩阵为酉矩阵时系统能达到未经预编码系统的性能.
정교빈분복용기술장다경쇠락신도화분위다개상대평탄적자신도,사득접수궤재신도고계등회복기술상복잡도대대강저.OFDM계통채용자신도연합예편마기술능유효해결유우성편자재파쇠락인기적수거주실문제.유우독립신도적선성예편마기술재발송단불수요신도반궤신식,인차강저료발송설비복잡도,감소료계통연시,해편마방안괄용우종용호단도기참적수거전수.통과이론분석추도료당계통채용독립신도적선성예편마기술시,접수단불능채용박령균형(ZF)적선성검측산법,실험방진표명,당채용박령균형검측산법시,당차부당예편마구진위유구진시계통능체도미경예편마계통적성능.
The multipath fading channel is divided into multiple relatively flat sub-channels by OFDM,which makes the re-ceiver′s complexity in channel estimation reduced greatly. OFDM system with sub-channel joint precoding technology can effec-tively solve the problem of data loss caused by numerous carrier wave fading. Since the linear precoding technology of indepen-dent channel doesn′t need feedback information of the channel in sending end,which can reduce the complexity of the transmit-ting device and system delay,this precoding scheme is suitable for data transmission from the client to the base station. In this paper,a conclusion that the linear detection algorithm of zero forcing equilibrium can′t be adopted for receiving end when the linear precoding technology of independent channel is applied by the system is derived according to the theoretical analysis. The experimental simulation results show that the system can achieve the performance without precoding when the precoding matrix is unitary matrix and zero forcing equilibrium detection algorithm is adopted.