Bandyopadhyay Saurav K, Partasides George, Kondi Lisimachos P
IEEE Trans Image Process. 2008 Jun;17(6):1020-4. doi: 10.1109/TIP.2008.921312.
In this paper, we consider the problem of video transmission over wireless generalized multicarrier code division multiple access (GMC-CDMA) systems. Such systems offer deterministic elimination of multiple access interference. A scalable video source codec is used and a multirate setup is assumed, i.e., each video user is allowed to occupy more than one GMC-CDMA channels. Furthermore, each of these channels can utilize a different number of subcarriers. We propose a cross-layer optimization method to select the source coding rate, channel coding rate, number of subcarriers per GMC-CDMA channel and transmission power per GMC-CDMA channel given a maximum transmission power for each video user and an available chip rate. Universal rate distortion characteristics (URDC) are used to approximate the expected distortion at the receiver. The proposed algorithm is optimal in the operational rate distortion sense, subject to the specific setup used and the approximation caused by the use of the URDC. Experimental results are presented and conclusions are drawn.
在本文中，我们考虑无线广义多载波码分多址（GMC-CDMA）系统上的视频传输问题。此类系统可确定性地消除多址干扰。我们使用了一种可扩展视频源编解码器，并假设采用多速率设置，即每个视频用户可占用多个GMC-CDMA信道。此外，这些信道中的每一个都可以使用不同数量的子载波。我们提出一种跨层优化方法，在给定每个视频用户的最大发射功率和可用码片速率的情况下，选择源编码速率、信道编码速率、每个GMC-CDMA信道的子载波数量以及每个GMC-CDMA信道的发射功率。通用率失真特性（URDC）用于近似接收机处的预期失真。在所使用的特定设置以及URDC使用所引起的近似条件下，所提出的算法在操作率失真意义上是最优的。文中给出了实验结果并得出了结论。
