摘要
到目前为止,降低MIMO-OFDM系统中所产生的较大PAPR的技术大致可以被分为三类:第一类是限幅类技术,包括限幅、峰值加窗或者峰值消除等操作;第二类是编码类技术,主要是使用补偿码,但是,以一定的开销为代价;第三类技术就是概率类技术,它利用不同的加扰序列对OFDM符号进行加权处理,从而选择PAPR较小的OFDM符号来传输。由于直接应用这些方法解决PAPR问题时,会带来很大的不便。鉴于此,文中提出一种新的理论——信号生成理论,融合在传统的编码类当中。从仿真结果来看,该方法不仅更好地保持了编码类方法原来的优势,而且极大地提高了编码效率和频谱利用率。
Up to now, methods of PAPR reduction techniques for MIMO-OFDM system can be divided into three classes： the first is clipping technique, including cutting, peak windowing or peak eliminating and so on; the 2^nd is coding technique, which mainly utilizes the advantage of compensating codes, however, with the extra expenditure; the 3^rd is probability technique, which employs different additional sequences to weight the initial OFDM signals, and thus select a favorable signal from these different signals for transmission. Because the direct use of these methods for reducing the PAPR causes much inconvenience, a new theory is proposed, that is, copy theory fused in the traditional coding method. Simulation results indicate that this new technique preserves the original advantages of the coding method, and also greatly improves the coding efficiency and spectrum efficiency.
出处
《通信技术》
2009年第7期62-65,共4页
Communications Technology
