Design and FPGA Implementation of VDES Demodulation System Based on Decision Feedback Algorithm

Dingzhu SUN; Man FENG; Fang DI; Peng CHEN

doi:10.12382/bgxb.2022.0471

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Design and FPGA Implementation of VDES Demodulation System Based on Decision Feedback Algorithm

更新时间：2025-08-18

- Design and FPGA Implementation of VDES Demodulation System Based on Decision Feedback Algorithm
- Acta Armamentarii Vol. 45, Issue 1, Pages: 312-318(2024)
- 作者机构：
  
  1. 东南大学信息科学与工程学院, 江苏南京 211100
  2. 三江学院数理部, 江苏南京 210012
- 作者简介：
- 基金信息：
- DOI：10.12382/bgxb.2022.0471
  CLC：
- Received：31 May 2022，
  
  Published Online：06 February 2024，
  
  Published：30 January 2024
- 稿件说明：
移动端阅览
Dingzhu SUN, Man FENG, Fang DI, et al. Design and FPGA Implementation of VDES Demodulation System Based on Decision Feedback Algorithm[J]. Acta Armamentarii, 2024, 45(1): 312-318.
DOI：

Dingzhu SUN, Man FENG, Fang DI, et al. Design and FPGA Implementation of VDES Demodulation System Based on Decision Feedback Algorithm[J]. Acta Armamentarii, 2024, 45(1): 312-318. DOI： 10.12382/bgxb.2022.0471.

摘要

甚高频数据交换系统(Very high frequency Data Exchange System

VDES)作为新一代船舶通信系统

具有广阔的应用前景。由于卫星相对船舶的高速运动

VDES中上行应用特定消息(Application-specific Message

ASM)链路会产生较大的多普勒频移

在接收端仅依靠已知训练序列估计的频偏等信道参数无法满足正确解调的性能要求。为此提出一种基于判决反馈的解调方法

通过分段解调

缩短每次解调的数据长度

提高解调时对频偏的容忍度

并利用每段解调的结果作为下一段未解调数据的导频

估计出当前数据中的信道参数。仿真结果表明

所提算法相较于无反馈相干解调算法性能大大提升。在上述研究的基础上

在可编程逻辑器件上实现了对ASM无导频上行链路的正确解调。

Abstract

VHF data exchange system (VDES) has broad application prospect as a new generation of ship communication system. Due to the high-speed motion of satellite

a large Doppler frequency shift is superimposed on the ASM uplink in VDES

and the channel parameters estimated only by training sequence in receiving end cannot meet the requirements of demodulation. Therefore

a VDES demodulation system based on decision feedback algorithm is proposed. The received data is split into small segments

which reduces the influence of frequency offset. The demodulated result of each segment is used as pilot to estimate the channel parameters in current data segment. Simulated results show that the performance of the proposed algorithm is superior to that of the coherent demodulation algorithm without feedback. On the basis of the above research

the correct demodulation of ASM uplink without pilots is implemented on the filed programmable gate array(FPGA).

关键词

Keywords

references

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