OQAM/OFDM系统中改进的重叠选择性映射方法

重叠选择性映射(overlapped selected mapping,OSLM)是用于降低基于交错正交幅度调制的正交频分复用系统(offset quadrature modulation/orthogonal frequency division multiplexing,OQAM/OFDM)峰均比(peak-to-average ratio,PAPR)的技术。在对传统OSLM方法进行分析的基础上,为了进一步降低系统的PAPR,针对其在传输过程中需要耗费额外频谱来传递边带信息的问题,提出了改进的OSLM方法。该方法通过改变特定位置相位旋转因子的模值,从而在接收端确定边带信息,节省了OQAM/OFDM系统中的频谱资源,进而降低了系统的PAPR。仿真结果表明,在相同信道且子载波数量较多的条件下,该方法能够进一步降低系统的PAPR,同时又不会导致误比特率明显提升。

Improved overlapped selected mapping in OQAM/OFDM systems

Overlapped selected mapping (OSLM) is a technique used to reduce the peak-to-average ratio (PAPR) of the orthogonal frequency division multiplexing (OFDM) system based on offset quadrature modulation (OQAM). The improved OSLM method is proposed to further reduce the PAPR based on the analysis of the traditional OSLM method. By changing the mode value of the phase rotation factor at some specific positions, this method can determine the side information at the receiving end, save spectrum resources in the OQAM/OFDM system and reduce PAPR of the system. The simulation results show that under the conditions of the same channel environment and a large number of subcarriers, this method can further reduce the PAPR of the system without increasing the bit error rate obviously.