Abstract
Compared with conventional digital video transmission, the recently proposed pseudo-analog video transmission addresses the problem of the cliff effect and leveling-off effect. However, the researches on pseudo-analog transmission are mostly done by software, which can’t be applied in the practice transmission tasks directly. In this paper, we propose a hardware-optimized pseudo-analog wireless video transmission system. The transmitted video signals are divided into the analog part and the digital part, respectively. The analog part includes the discrete cosine transformation (DCT) coefficients after power allocation (PA). The digital part consists of the variance of L-shaped chunks and some significant fix-point DCT coefficients. Turbo code and cyclic redundancy check (CRC) are utilized to protect the digital bits. We propose two optimization methods for the pseudo-analog system. One of them is to optimize the division of the source, with which our system performs at most 2dB better than SoftCast. The other is compression based on frequency domain data, which achieves a maximum 49% compression rate with less than 1dB performance loss. We implement the whole system on FPGA and evaluate the system with extensive simulations.
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