摘要
基于正交频分复用(Orthogonal Frequency Division Multiplexing,OFDM)技术的多载波雷达是近年来兴起的一种新体制雷达,因其具良好的抗干扰性能、较高的频谱利用率和易于数字化处理等诸多优点而备受关注。然而,OFDM雷达信号有较高的峰值平均功率比(Peak to Average Power Ratio,PAPR),会导致信号在传输过程中引入互调噪声,严重影响系统的误码率(Bit Error Radio,BER)指标性能,部分传输序列(Partial Transmit Sequence,PTS)是一种有效降低OFDM雷达系统PAPR的方法。本文在研究了传统PTS算法的基础上,提出了一种将联合分割子序列与迭代移位搜索加权因子相结合的改进PTS算法。仿真结果表明:改进后的算法在改善PAPR性能和计算的复杂度之间取得了较好的折衷。
The radar which is based on OFDM （orthogonal frequency division multiplexing） technology is a new radar system and is concerned by researchers since it has many advantages, such as good anti-jam, high spectrum efficiency, simple digital processing and so on. However, the high PAPR （Peak to Average Power Ratio） of OFDM Radar signal causes intermodulation noise during transmission, it degrades the BER （Bit Error Radio） performance of the system heavily, PTS （Partial Transmit Sequence） is an effective method to reduce the PAPR of OFDM Radar system. In this paper an improved PTS method combined iterative shifting linear-searching with random and interleaving sub-block division based on ordinary PTS method is presented. The result of simulation shows that this improved PTS method achieves a good compromise between PAPR performance and computation complexity.
出处
《自动化技术与应用》
2015年第10期48-51,共4页
Techniques of Automation and Applications
基金
海军大连舰艇学院2014年科研发展基金资助项目(编号2014032)
