自由空间光通信中的带符号光正交空间调制

赵辉; 刘亮; 韩利利; 秦玉林; 李俊男

doi:10.13756/j.gtxyj.2024.230075

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自由空间光通信中的带符号光正交空间调制

无线通信技术 | 更新时间：2024-05-30

- 自由空间光通信中的带符号光正交空间调制
- Signed Optical Quadrature Spatial Modulation in Free Space Optical Communication
- 光通信研究 2024年第3期页码：23007501-23007508
- 作者机构：
  
  1.重庆邮电大学　通信与信息工程学院，重庆　400065
  2.信号与信息处理重庆市重点实验室，重庆　400065
- 作者简介：
  
  赵辉，教授。E-mail：zhaohui@cqupt.edu.cn
- 基金信息：
  
  国家自然科学基金资助项目(12104078)
- DOI：10.13756/j.gtxyj.2024.230075
  中图分类号： TN929.12
- 纸质出版日期：2024-06-10，
  
  收稿日期：2023-05-18，
  
  修回日期：2023-05-29，
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赵辉，刘亮，韩利利，等.自由空间光通信中的带符号光正交空间调制[J].光通信研究，2024（3）：230075.

Zhao H, Liu L, Han L L, et al. Signed Optical Quadrature Spatial Modulation in Free Space Optical Communication[J]. Study on Optical Communications, 2024（3）：230075.
赵辉，刘亮，韩利利，等.自由空间光通信中的带符号光正交空间调制[J].光通信研究，2024（3）：230075. DOI： 10.13756/j.gtxyj.2024.230075.

Zhao H, Liu L, Han L L, et al. Signed Optical Quadrature Spatial Modulation in Free Space Optical Communication[J]. Study on Optical Communications, 2024（3）：230075. DOI： 10.13756/j.gtxyj.2024.230075.

摘要

【目的】

针对光正交空间调制（OQSM）中频谱效率较低和系统吞吐量受限的问题，文章在自由空间光通信（FSOC）中提出了一种带符号的光正交空间调制（SOQSM）方案；另外，针对OQSM性能分析时所用信道不适合所有湍流的情况，文章采取适合所有湍流强度的Málaga信道对系统的误码性能进行分析。

【方法】

首先，该方案在发送端将输入的二进制比特流划分为5个部分，第1个部分用于星座符号映射，后4个部分用于激光器映射；然后，星座符号映射用于传输星座符号及其逆符号的实部和虚部；激光器映射分为同相相位与正交相位两部分，用于激活激光器的序列映射；最后，通过信道进行传输，在接收端进行信号的接收和处理。

【结果】

相比OQSM，SOQSM在一个传输周期内空间域额外携带了2log

比特的信息，并在符号域和空间域分别计算出平均误码率上界，最终得到SOQSM方案的平均误码率上界，其中计算平均误码率上界的方法具有较好的收敛性。该方案较大程度地提高了系统的频谱效率和传输速率，拥有较好的误码性能。

【结论】

蒙特卡洛仿真结果表明：在频谱效率相同时，相比光空间调制（OSM）和OQSM，SOQSM方案的误码性能更好，能在信噪比为16 dB时就达到10

-6

；当调制阶数相同时，SOQSM的误码

性能更优，特别是在高信噪比时，仿真与理论契合度较高。在Málaga信道中弱湍流的误码性能更好；另外，不同湍流强度对SOQSM方案误码性能趋势的影响较小，但随着信噪比提高，影响会逐渐增大。因此，SOQSM相比OQSM和OSM具有更好的误码性能。

Abstract

【Objective】

Aiming at the problems of low spectral efficiency and limited system throughput in Optical Quadrature Spatial Modulation (OQSM)

a Signed Optical Quadrature Spatial Modulation (SOQSM) scheme is proposed in Free Space Optical Communication (FSOC) in this paper. In addition

in view of the fact that the channel used in the performance analysis of OQSM is not suitable for all turbulence

this paper also adopts the Málaga channel

which is suitable for all turbulence intensities to analyze the bit error performance of the system.

【Methods】

First

the scheme divides the input binary bit stream into five parts at the sending end. The first part is used for constellation symbol mapping

and the last four parts are used for laser mapping. Then

the constellation symbol mapping is used to transmit the real and imaginary parts of the constellation symbol and its inverse symbol. The laser mapping is divided into two parts

the in-phase phase and the quadrature phase

which are used to activate the laser sequence mapping. Finally

after transmitting through the channel

the signal received and processed at the receiving end.

【Results】

Compared with OQSM

SOQSM carries an additional2log

bits of information in the space domain within a transmission period. The upper bound of the average bit error rate is then calculated in the symbol domain and the space domain respectively. Finally

the upper bound of the average bit error rate of the SOQSM scheme is obtained

and the method of calculating the upper bound of the average bit error rate has good convergence. This solution greatly improves the spectral efficiency and transmission rate of the system

and has good bit error rate performance.

【Conclusion】

The Monte Carlo simulation results show that compared with Optical Spatial Modulation (OSM) and OQSM

the bit error performance of the SOQSM scheme is better when the spectral efficiency is the same. The bit error rate can reach 10

-6

when the signal-to-noise ratio is 16dB. When the modulation order is the same

the bit error performance of SOQSM is better

especially when the signal-to-noise ratio is high. It is also shown that the simulation and theory fit well. In the Málaga channel

the bit error rate performance of the weak turbulence is better. In addition

different turbulence intensities have little influence on the trend of the bit error rate performance of the SOQSM scheme. However

with the increase of the signal-to-noise ratio

the influence will gradually increase. Therefore

SOQSM has better bit error rate performance than OQSM and OSM.

关键词

自由空间光通信光空间调制频谱效率误码性能

Keywords

FSOCOSMspectral efficiencybit error performance

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