Journal of Jilin University(Engineering and Technology Edition) ›› 2020, Vol. 50 ›› Issue (5): 1870-1875.doi: 10.13229/j.cnki.jdxbgxb20190558

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A new method of troposcatter communication based on frequency hopping and simulation analysis

Bin-song SHEN1(),Jian-cun QIN2(),Wen-cheng REN1   

  1. 1.The 54th Research Institute of CETC, Shijiazhuang 050081, China
    2.CETC Network & Communications Group Co. , Ltd. , Shijiazhuang 050081, China
  • Received:2019-06-03 Online:2020-09-01 Published:2020-09-16
  • Contact: Jian-cun QIN E-mail:93349647@qq.com;13903116377@139.com

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Abstract:

In this paper, a novel anti-fading method based on frequency hopping is proposed to solve the problem of multipath fading characteristics of troposcatter communication channels. The troposcatter communication model based on frequency hopping is established and the performance of this method is theoretically analyzed in fading channel. The algorithm flow of its received baseband signal processing is given. The frame coarse synchronization algorithm based on frequency hopping frame structure and the frame fine synchronization algorithm based on channel response search are adopted to solve frame synchronization problem in fading channel. The frequency domain equalization algorithm based on channel de-noising estimation and aliasing extraction is adopted to overcome channel multipath effectively and suppress noise amplification. Simulation results verify the validity and effectiveness of the proposed method.

Key words: troposcatter communication, frequency hopping, anti-fading, frame synchronization, channel equalization

CLC Number: 

  • TN926

Fig.1

Troposcatter communication system model based on frequency hopping"

Table 1

Comparison table of characteristics of different troposcatter communication systems"

分集方式性能设备复杂度算法复杂度缺点
空间最优复杂复杂设备复杂
跳频良好简单简单无
频率良好简单复杂峰均比高、有交调
时间良好简单复杂大时延
角分集优复杂复杂设备复杂

Fig.2

Frequency hopping troposcatter communication received signal baseband processing flow"

Table 2

Frequency hopping data frame structure"

帧内容长度帧内容长度
GAP36SERV12
RU4DATA816
PILOT32PILOT32
CTRL64RD4

Fig.3

Correlation peak alignment process"

Fig.4

Schematic diagram of time-domain impulse response before and after fine frame synchronization adjustment"

Fig.5

Channel estimation algorithm flow"

Fig.6

Frequency response before and after correction in AWGN channel"

Fig.7

Performance simulation model of anti-fading method"

Fig.8

Constellation of demodulator"

Fig.9

Error performance curve of anti-fading method"

Fig.10

Error performance curve of anti-fading method in different multipath channel"

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