Pseudo Analog Research Articles

Human-Perception-Oriented Pseudo Analog Video Transmissions With Deep Learning

Recently, pseudo analog transmission has gained increasing attentions due to its ability to alleviate the cliff effect in video multicast scenarios. The existing pseudo analog systems are sorely optimized under the minimum mean squared error criterion without taking the perceptual video quality into consideration. In this paper, we propose a human-perception-based pseudo analog video transmission system named ROIC-Cast, which aims to intelligently enhance the transmission quality of the region-of-interest (ROI) parts. Firstly, the classic deep learning based saliency detection algorithm is adopted to decompose the continuous video sequences into ROI and non-ROI blocks. Secondly, an effective compression method is used to reduce the data amount of side information generated by the ROI extraction module. Then, the power allocation scheme is formulated as a convex problem, and the optimal transmission power for both ROI and non-ROI blocks is derived in a closed form. Finally, the simulations are conducted to validate the proposed system by comparing with a few of existing systems, e.g., KMV-Cast, SoftCast, and DAC-RAN. The proposed ROIC-Cast can achieve over 4.1dB peak signal- to-noise ratio gains of ROI compared with other systems, given the channel signal-to-noise ratio as -5dB, 0dB, 5dB, and 10dB, respectively. This significant performance improvement is due to the automatic ROI extraction, high-efficiency data compression as well as adaptive power allocation.

A Hybrid Digital Analog Scheme for MIMO Multimedia Broadcasting

A new scenario for wireless broadcasting is the antenna heterogeneity. In this letter, we propose a new hybrid digital analog design to make the users attain the perceptual quality commensurate with their antenna numbers. A high resolution video is decomposed into a base layer and an enhancement layer. The base layer is transmitted by the conventional digital space time coding scheme. The enhancement layer is transmitted by the pseudo analog and spatial multiplexing that is applied to provide signal quality commensurate with antenna number of users. Compared with the conventional frameworks, the proposed system achieves a notable margin in the peak signal-to-noise ratio and much better performances for receivers with more antennas.

擬似アナログ信号を用いたスペクトラム拡散によるスイッチング電源回路のEMI低減手法の提案

In this paper, EMI reduction method for switching power supply circuit by using PLL circuit as reference signal whose spectrum is spreaded, is proposed. M-sequence pseudo random signal is employed for PLL spectrum spread. Next, we extend this low bit M-sequence pseudo random signal to spectrum spread signal called “pseudo analog signal. ” The proposed pseudo analog signal can realize that the effect of the spectrum spread is wide even if the number of bit of the pseudo random circuit is small. Simulations and measurement are performed to verify the validity of the proposed method. Simulation and measurement results indicate that the proposed method have a large effect of the spectrum spread.