Realtime transmission of full high-definition 30 frames/s videos over 8#x00D7;8 MIMO-OFDM channels using HACP-based lossless coding

摘要

Recently, video quality on TV programs and the Internet has become dramatically high. In this situation, demand for sharing high quality video sequences without wiring is increasing. Considering the bit rate of wireless channels, we should use lossy compression to transmit video sequences. However, this approach is not always ideal in terms of video quality. Therefore, our group is trying to develop a system of wireless transmission and lossless video compression. In this paper, we evaluated the system in computer simulation. As for the compression part, we confirmed that the combination of hierarchical average and copy prediction (HACP) algorithm and Huffman coding has good compression performance and suitable for hardware implementation. As for the transmission part, we adopted 8×8 MIMO-OFDM, which is employed in IEEE802.11ac, because this system can transmit data of about 1Gbps or more. Considering noise by transmission errors, we propose a packet construction method to reduce noise. In the evaluation, we explore conditions of wireless systems where noise does not appear and stable image is obtained by simulating. The experimental results show that stable transmission can be achieved in case of 18 dB CNR, 16QAM moduration, and 1/2 coding rate.