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CP-based MIMO OFDM radar IRCI free range reconstruction using real orthogonal designs

基于循环前缀的同频MIMO OFDM雷达无自扰距离重构算法

Abstract

In this paper, we propose a range reconstruction method for a frequency-band shared multipleinput multiple-output (MIMO) orthogonal frequency-division multiplexing (OFDM) radar with sufficient cyclic prefix (CP) by using real orthogonal designs. Compared with the application of complex orthogonal designs in our previous work, the application of real orthogonal designs can significantly reduce the number of the all-zero-valued pulses in a coherent processing interval (CPI) for each transmitter and increase the efficiency of radar transmitters. Meanwhile, it still maintains the advantages of full spatial diversity without inter-range-cell interference (IRCI). We also apply the rate-1 real orthogonal designs for different numbers of transmitters and pulses for range reconstruction without any idleness of radar transmitters. Simulation results are presented to illustrate the performances of the OFDM pulse design and the CP-based MIMO OFDM radar using real orthogonal designs.

摘要

创新点

  1. 1.

    在共享频谱的情况下, 提出了基于循环前缀的MIMO OFDM 雷达回波模型。

  2. 2.

    提出了 MIMO OFDM 雷达联合脉冲压缩和脉冲相干积累算法, 当循环前缀长度充足时, 在不同发射信号共享频谱的情况下, 实现不同发射信号频域子带的正交性, 并实现无距离旁瓣脉冲压缩。

  3. 3.

    结合实正交设计, 提出了基于 Paraunitary 滤波器组和迭代 Clipping 加滤波的两种 MIMO OFDM 波形设计算法, 实现了任意长度 MIMO OFDM 发射脉冲的联合脉冲压缩和脉冲相干积累, 并保持了不同发射信号的无互扰和无距离旁瓣脉冲压缩。

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Correspondence to Tianxian Zhang.

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Zhang, T., Xia, X. & Kong, L. CP-based MIMO OFDM radar IRCI free range reconstruction using real orthogonal designs. Sci. China Inf. Sci. 60, 022301 (2017). https://doi.org/10.1007/s11432-015-0979-5

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Keywords

  • cyclic prefix (CP)
  • inter-range-cell interference (IRCI)
  • multiple-input multiple-output (MIMO) radar
  • real orthogonal designs
  • orthogonal frequency division multiplexing (OFDM) pulse

关键词

  • 循环前缀 (CP)
  • 同频多输入多输出 (MIMO) 雷达
  • 实正交设计