| 摘要: |
| 为了提高大气光通信信息传输的高效性和可靠性，提出一种压缩数字脉冲间隔调制（CDPIM）技术。该技术对相邻4位信息码组分别经PPM编码后，把编码脉冲之间多余的空闲时隙用分段压缩码进行替换来进行编码。描述了CDPIM的符号结构，运用Matlab对发射功率、频带利用率、信道容量占用率、传输误包率等的仿真结果表明：在相同位分辨率4时，CDPIM的发射功率比FDPIM的发射功率节约23%,CDPIM的频带利用率比DPIM的频带利用率提高72%,CDPIM的传输容量比OOK的传输容量提高67%。在相同信噪比2时，CDPIM的误包率比DPIM的误包率提高60%,而且CDPIM调制技术能对接收的错误码组进行有效的自我纠错。 |
| 关键词: 大气激光通信 压缩数字脉冲间隔调制 发射功率 频带利用率 信道容量占用率 误包率 |
| DOI： |
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| 基金项目:中国工程物理研究院-四川大学协同创新联合基金 |
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| Compressed digital pulse interval modulation technology in atmospheric laser communication |
| ZHANG Ya-zhou,LI Zhi |
| () |
| Abstract: |
| In order to improve the efficiency and reliability of information transmission in atmospheric laser communication, a method called compressed digital pulse interval modulation technology is proposed. The technology eliminates the extra free time slots in coordination with the rules of subsection compression coding after the pulse position modulation(PPM) for four adjacent information code groups is finished. In this paper, the CDPIM′s symbol structure is described,the CDPIM with the OOK, PPM, DPIM and FDPIM modulation method in aspects of transmission power, transmission package error rate, band utilization rate and channel capacity utilization is compared by Matlab. The experiment shows that, at the same bit resolution (4), the CDPIM, compared with the FDPIM, saves 23% transmission power. The band utilization rate of CDPIM increases by 72% than the DPIM′s. The transmission capacity of CDPIM increases by 67% than that of the OOK. The simulation also illustrates that，at the same signal-to-noise ratio (2)，the packet error rate of CDPIM increases by 60% than the DPIM′s. Meanwhile，the CDPIM modulation technology can achieve the function of self-repair effectively. |
| Key words: atmospheric laser communication compressed digital pulse interval modulation transmission power band efficiency channel capacity occupancy rate package error rate |
