Decoder Synchronous Trigger Signal Modulation Technology for High Definition Image Transmission
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.
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