降低OFDM系统峰均比的SI-PTS算法
发布时间：2019-06-21 08:42
【摘要】：针对正交频分复用系统的高峰均功率比问题,在传统子块交织和部分传输序列(partial transmit sequence,PTS)算法的改进基础上提出了联合SI-PTS算法。算法中提出了1个新的子块交织方案,其中的每个子块相互交织。另外,还提出了1个新的相位因子优化方案,方案中的相位因子只有两相序列,迭代次数等于子数据块的数目,极大地降低了计算复杂度。所提算法基于传统PTS算法,利用新的优化方案优化部分传输序列,并结合新的子块交织技术,打乱原正交频分复用(orthogonal frequency division multiplexing,OFDM)信号序列,以降低其相关性,并进而降低OFDM系统的PAPR值。仿真结果表明,SI-PTS算法与传统PTS、SLM算法相比,能有效地改善OFDM系统的PAPR性能,并在保持系统误码率性能的前提下,有效地降低计算复杂度;SI-PTS算法对PAPR的抑制能力随着子载波数目的增加而下降,随着分组数的增加而提高。
[Abstract]:In order to solve the problem of peak-to-average power ratio (PAPR) in orthogonal frequency division multiplexing (ODM) systems, a joint SI-PTS algorithm is proposed based on the improvement of the traditional subblock interleaving and partial transmission sequence (partial transmit sequence,PTS) algorithm. In the algorithm, a new subblock interleaving scheme is proposed, in which each subblock interweaves with each other. In addition, a new phase factor optimization scheme is proposed, in which the phase factor is only two-phase sequence, and the number of iterations is equal to the number of sub-data blocks, which greatly reduces the computational complexity. Based on the traditional PTS algorithm, the proposed algorithm uses a new optimization scheme to optimize the partial transmission sequence, and combines the new subblock interleaving technology to disrupt the original orthogonal frequency division multiplex (orthogonal frequency division multiplexing,OFDM) signal sequence in order to reduce its correlation and then reduce the PAPR value of OFDM system. The simulation results show that compared with the traditional PTS,SLM algorithm, SI-PTS algorithm can effectively improve the PAPR performance of OFDM system and effectively reduce the computational complexity while maintaining the BER performance of the system, and the suppression ability of SI-PTS algorithm to PAPR decreases with the increase of the number of subcarriers and increases with the increase of block number.
【作者单位】： 太原理工大学信息工程学院;
【基金】：国家自然科学基金资助项目(61271249)
【分类号】：TN929.53
本文编号：2503942
[Abstract]:In order to solve the problem of peak-to-average power ratio (PAPR) in orthogonal frequency division multiplexing (ODM) systems, a joint SI-PTS algorithm is proposed based on the improvement of the traditional subblock interleaving and partial transmission sequence (partial transmit sequence,PTS) algorithm. In the algorithm, a new subblock interleaving scheme is proposed, in which each subblock interweaves with each other. In addition, a new phase factor optimization scheme is proposed, in which the phase factor is only two-phase sequence, and the number of iterations is equal to the number of sub-data blocks, which greatly reduces the computational complexity. Based on the traditional PTS algorithm, the proposed algorithm uses a new optimization scheme to optimize the partial transmission sequence, and combines the new subblock interleaving technology to disrupt the original orthogonal frequency division multiplex (orthogonal frequency division multiplexing,OFDM) signal sequence in order to reduce its correlation and then reduce the PAPR value of OFDM system. The simulation results show that compared with the traditional PTS,SLM algorithm, SI-PTS algorithm can effectively improve the PAPR performance of OFDM system and effectively reduce the computational complexity while maintaining the BER performance of the system, and the suppression ability of SI-PTS algorithm to PAPR decreases with the increase of the number of subcarriers and increases with the increase of block number.
【作者单位】： 太原理工大学信息工程学院;
【基金】：国家自然科学基金资助项目(61271249)
【分类号】：TN929.53
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