PPM Channel Parameter Estimation based on Photon Detection

XIANG Jin-song; GOU Lin; XU Ning-jie; Lü Xin-hao

doi:10.13756/j.gtxyj.2022.04.005

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PPM Channel Parameter Estimation based on Photon Detection

更新时间：2022-08-01

- PPM Channel Parameter Estimation based on Photon Detection
- Study on Optical Communications Issue 4, Pages: 23-26,78(2022)
- 作者机构：
  
  重庆邮电大学　通信与信息工程学院，重庆　400065
- 作者简介：
- 基金信息：
- DOI：10.13756/j.gtxyj.2022.04.005
  CLC： TN929.12
- Published：10 August 2022，
  
  Received：16 November 2021，
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XIANG Jin-song, GOU Lin, XU Ning-jie, et al. PPM Channel Parameter Estimation based on Photon Detection. [J]. Study on Optical Communications (4):23-26,78(2022)
DOI：

XIANG Jin-song, GOU Lin, XU Ning-jie, et al. PPM Channel Parameter Estimation based on Photon Detection. [J]. Study on Optical Communications (4):23-26,78(2022) DOI： 10.13756/j.gtxyj.2022.04.005.

摘要

基于光子探测的脉冲位置调制（PPM）空间光通信信道估计中，针对信号光子平均数以及背景光子平均数等参数估计问题，文章提出了两种估计信号光子平均数以及背景光子平均数方案。方案一，依据

阶PPM，

个时隙中只有一个有信号光时隙的特性，通过比较光子探测器计数到的每个符号中各时隙光子数以及统计纠错帧中各时隙光子总数，粗略估计信号光子平均数与背景光子平均数；方案二则是在方案一的基础上，在串行级联脉冲位置调制（SCPPM）系统中采用判决反馈方式重新确定信号光时隙位置。由于SCPPM累加器的存在导致错误传播，因此将译码输出的软信息先交织，再经硬判决以及累加后进行比特到PPM符号的映射重新确定信号光时隙位置，以此获得更加精确的信号光子平均数与背景光子平均数。

Abstract

In the Pulse Position Modulation (PPM) space optical communication channel estimation based on photon detection

two schemes for the estimation of signal photon average and background photon average are proposed. Scheme 1 is based on the characteristic of

-order PPM

where only one of the

slots has a signal optical slot. The signal photon average and the background photon average are roughly estimated by comparing the number of photons in each slot in each symbol counted by the photon detector and by counting the total number of photons in each slot in the error correction frame. The proposed method in scheme 2 is based on that in scheme 1. The signal optical slot position is re-determined by decision feedback in the Serially Concatenated Pulse Position Modulation (SCPPM) system. Since the existence of SCPPM accumulator leads to error propagation

the soft information output by decoding is first interleaved

and then mapped from bit to PPM symbols after hard decision and accumulation. Finally

the position of signal optical slot is re-determined to obtain more accurate signal photon average and background photon average.

关键词

空间光通信脉冲位置调制信道估计信号光子平均数背景光子平均数判决反馈

Keywords

space optical communicationPPMchannel estimationsignal photon averagebackground photon averagedecision feedback

references

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