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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。
So far, techniques to reduce the large PAPR generated in a MIMO-OFDM system can be broadly classified into three categories. The first category is clipping technology, which includes clipping, peak windowing, or peak elimination. The second Classes are coding techniques, mainly using compensation codes, but at the expense of a certain overhead. The third technique is probabilistic techniques, which use different scrambling sequences to weight the OFDM symbols and thus select the smaller PAPR OFDM symbol to transmit. Because of the direct application of these methods to solve PAPR problems, it will bring great inconvenience. In view of this, the paper presents a new theory - signal generation theory, which is integrated into the traditional coding class. From the simulation results, this method not only better preserves the original advantages of the coding class method, but also greatly improves the coding efficiency and spectrum utilization.