一种超宽带零中频的微波光子信道化接收机

陈博,王明军,高永胜. 一种超宽带零中频的微波光子信道化接收机[J]. 光电工程,2020,47(3):190650. doi: 10.12086/oee.2020.190650
引用本文: 陈博,王明军,高永胜. 一种超宽带零中频的微波光子信道化接收机[J]. 光电工程,2020,47(3):190650. doi: 10.12086/oee.2020.190650
Chen B, Wang M J, Gao Y S. An ultra-wideband microwave photonic channelized receiver with zero-IF architecture[J]. Opto-Electron Eng, 2020, 47(3): 190650. doi: 10.12086/oee.2020.190650
Citation: Chen B, Wang M J, Gao Y S. An ultra-wideband microwave photonic channelized receiver with zero-IF architecture[J]. Opto-Electron Eng, 2020, 47(3): 190650. doi: 10.12086/oee.2020.190650

一种超宽带零中频的微波光子信道化接收机

  • 基金项目:
    陕西省重点研发计划项目(2018NY-158);咸阳师范学院“青年骨干教师”培养项目(XSYGG201716)
详细信息
    作者简介:
    通讯作者: 高永胜(1989-),男,博士,副教授,主要从事微波光子方面的研究。E-mail:ysgao@nwpu.edu.cn
  • 中图分类号: TN29;TN929.1

An ultra-wideband microwave photonic channelized receiver with zero-IF architecture

  • Fund Project: Supported by Shaanxi Provincial Key Research and Development Program (2018NY-158) and Xianyang Normal College Youth Key Program (XSYGG201716)
More Information
  • 信道化接收技术是现代电子战和雷达系统的重要组成部分,是满足其高频段、大带宽、多通道同时接收等需求的核心使能技术。本文提出了一种基于微波光子的零中频接收机,可通过调整光频梳中心频率的方法使之与宽带RF信号组的中心频率相对应,从而实现3 GHz的宽带射频信号的信道化接收,每个子信道带宽为600 MHz且直接解调为I/Q基带信号。

  • Overview: In modern electronic warfare and radar systems, because the microwave signal received by the receiver has the characteristics of large instantaneous bandwidth, multiple signal types, wide frequency coverage and diversified forms, it is required that the receiver must also have large instantaneous receiving bandwidth, be able to process the multi-frequency and multi-form signals arriving at the same time in real time, and the receiver also needs to have high sensitivity and high resolution. The channelized receiver can divide the received wideband signal into sub-bands of different frequencies, and convert all sub-bands into the same intermediate frequency signal or baseband signal by using down-conversion, which not only greatly reduces the requirements of the system for the ADC but also realizes simultaneous reception of multi-frequency signals. The digital channelized receiver has the advantages of flexible tuning and high precision. However, due to the severe limitation of ADC sampling rate and working bandwidth, it cannot meet the processing requirements of highly intensive ultra wideband signals. Compared with coaxial cable, optical fiber has the advantages of low loss, strong anti electromagnetic interference ability, small volume, light weight and so on. It has become an important transmission medium in the field of communication. The fusion of microwave technology and optical fiber technology has produced a new interdisciplinary subject--microwave photonics. It can flexibly realize the mutual conversion of optical wave and microwave signal, and has a series of advantages such as large instantaneous bandwidth of photonics, wide working frequency band, high isolation, anti electromagnetic interference, etc., which provides a new solution for the research of new channelized receiver.

    In this paper, a zero-IF channelized receiver based on microwave photon series is proposed. A scheme for realizing zero-intermediate frequency (IF) channelized receiver using a dual-polarization quadrature phase-shift keying (DP-QPSK) modulator and a narrow-band optical filter is proposed. The channelized system only requires one optical frequency combs to achieve zero-IF multi-channel reception of wideband signals, and the spacing of the optical frequency comb only needs to be equal to the sub-channel width, which is very easy to implement. It is found that using photonic IQ demodulation and balanced detection and reception technology can not only eliminate many disadvantages of the traditional zero-IF receiver, including local oscillator (LO) leakage, DC offset, even-order distortion, and in-phase/quadrature (I/Q) imbalance, but also reduce the bandwidth and sample rate of the analog-to-digital converter (ADC). It is theoretically proved that the RF signal with a bandwidth of 3 GHz can be divided into five sub-channels with a bandwidth of 600 MHz and finally demodulated to I/Q basebands, which is also verified with simulation.

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  • 图 1  零中频结构的微波光子信道化接收机示意图

    Figure 1.  Schematic diagram of proposed microwave photonic channelization receiver with Zero-IF architecture

    图 2  五线光梳示意图

    Figure 2.  Schematic diagram of 5 comb lines

    图 3  经宽带射频信号调制的频谱

    Figure 3.  Spectrum modulated by the wideband RF signals

    图 4  双音信号测试结果。(a)未加平衡探测;(b)平衡探测

    Figure 4.  Test result of two-tone signal. (a) Without balanced detection; (b) With balanced detection

    图 5  RF功率从-20 dBm增加至20 dBm时的EVM和星座图

    Figure 5.  Measured EVM and constellation diagram when the power of the RF signal is tuned from -20 dBm to 20 dBm

    表 1  各信道之间的串扰测量结果

    Table 1.  Measured channel crosstalk between all sub-channels  dB

    Sub-channel 1 2 3 4 5
    1 0 25.5 26.5 27.5 28.5
    2 25.5 0 25.5 26.5 27.5
    3 26.5 25.5 0 25.5 26.5
    4 27.5 26.5 25.5 0 25.5
    5 28.5 27.5 26.5 25.5 0
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出版历程
收稿日期:  2019-11-02
修回日期:  2019-12-02
刊出日期:  2020-03-01

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