5G SCMA无线网络中视频跨层传输

Cross-layer Video Transmission over 5G SCMA Network

稀疏码多址接入是一种新的非正交多址接入技术,它能有效地提高未来5G网络的频谱利用率。但是随着新型视频业务不断涌现,视频业务对带宽的需求也不断增长,如何在无线环境下高效地传输视频仍然是很大的挑战。为了提高视频业务在未来5G无线通信系统的传输质量,对SCMA上行链路的视频传输优化进行了研究。基站获取了用户将发送视频业务的率失真特性,并根据无线信道情况和特定的编码本向每个用户分配无线子载波,使得系统的传输性能最优。本优化问题可以归纳为二进制整数规划问题并用L-W贪婪算法解决此问题。通过在MATLAB上的仿真验证该方法能有效提高视频的传输质量。

Sparse code multiple access is a new non-orthogonal multiple-access technique which can improve spectral utility of 5 G wireless network. However,the bandwidth requirement for the new type of video service is growing,improving the video transmission over the future wireless environment is still a challenge. In order to improve the video transmission performance in the future 5 G wireless system,the video transmission optimization method over the uplink SCMA system is proposed in this work. The base station obtains the requested video distortion-rate relationship from the video client,according to the wireless channel condition and a specific codebook,it will allocate wireless subcarriers to maximize the video transmission performance. The optimizing problem is a summarized as a mixed binary integer programming problem and solved using a L-W greedy method. Simulation results show that the proposed algorithm greatly improves the video transmission performance.