面向图像高清传输的解码器同步触发信号调制技术
Decoder Synchronous Trigger Signal Modulation Technology for High Definition Image Transmission
郭斌1
作者信息
- 1. 中国人民解放军92493部队,辽宁 葫芦岛 125000
- 折叠
摘要
当前解码器同步触发信号在调制过程中容易受到噪声影响造成信号失真,导致解码后的图像细节模糊;为了增强图像清晰度,提出面向图像高清传输的解码器同步触发信号调制技术;在设计的FPGA平台中,采用并发控制机制确保SRAM存储模块多任务访问时避免数据冲突与不一致;并结合电力载波模块和PLC网络传输器保证系统的同步性与一致性;基于16×16并行累加器输出对SRAM进行寻址,并通过同相与正交频率运算获取基带信号;同时结合DDS数字合成理论实现符号速率自由控制,在此基础上,使用5通道解码器同步触发信号调制将传输信息位映射成同步传输序列,并通过施加振荡电流,并利用数据拟合辨识方法构建传递函数,调整调制信号以改善传输中的畸变与衰减,由此完成信号调制;实验结果表明,该技术对BPSK、QPSK、FSK信号的调制误差分别为1dB、1 dB、2 dB,对图像解码效果的影响较低,能够获得细节清晰的高清图像.
Abstract
The synchronization trigger signal of the current decoder is easily affected by noise during the modulation process,cau-sing signal distortion and blurred image details after demodulation.To enhance image clarity,a decoder synchronous trigger signal modulation technology for high-definition image transmission is proposed.In the designed FPGA platform,a concurrency control mechanism is adopted to ensure that SRAM storage modules avoid data conflicts and inconsistencies during multitasking access.Com-bined the power carrier module and PLC network transmitter,it ensures the synchronization and consistency of the system.The SRAM based on 16 X 16 parallel accumulator output are addressed,and baseband signals are obtained through in-phase and orthogo-nal frequency operations.At the same time,digital synthesis theory(DDS)digital synthesis theory is combined to achieve the symbol rate free control,on this basis,a 5-channel decoder is used to synchronously trigger signal modulation to map the transmitted infor-mation bits into synchronous transmission sequence.The oscillation current and data fitting identification methods are adopted to con-struct the transfer function,the modulation signal is adjusted to improve distortion and attenuation during the transmission,thus com-pleting the signal modulation.The experimental results show that by using this technology,the modulation errors of binary phase shift keying(BPSK),quadrature phase shift keying(QPSK),and frequency shift keying(FSK)signals are 1 dB,1 dB,and 2 dB,respectively.It has relatively low influence on image decoding,and can obtains high-definition images with clear details.
关键词
图像高清传输/解码器/同步触发/信号调制/FPGA平台/DDS数字合成理论Key words
high-definition image transmission/decoder/synchronous triggering/signal modulation/FPGA platform/DDS引用本文复制引用
出版年
2024
NETL
NSTL
万方数据