Media motion-based resource distribution for mobile video networking

Wireless video communication is challenging due to vulnerability of media bitstreams to channel distortions. Investigation has been carried out on wireless video channel under tight networking resource budget. One of the challenges is the impact of channel errors on the quality of media streams with high motion activity. Motion activity in this context defines the magnitude of activity displacement in video sequence. Based on the analysis, Media Motion-based Resource Distribution (MRD) is proposed to maximize the average received video quality over wireless system, by regulating the resource distribution of the media streams based on their motion activity characteristics. Experimental results demonstrate that the proposed scheme can improve the average received video quality performance under tight resource constraints budget. Keywords: Wireless video communication, resource constraints, received video performance, media motio

Optimal power allocation for multirate CDMA systems with interference cancellation

In this paper, we will derive the optimal (minimal) power allocation and capacity, for a multirate DS/CDMA system with various QoS requirements. Most of the previous work on power allocation only dealt with the conventional matched filter (MF) receiver and no multiuser detection (MUD) was considered. It is well known that MUD and in particular interference cancellation (IC) can be used to improve the system performance significantly. Hence, after proposing a novel graph-aided method to do optimal power allocation with the conventional W receiver, Parallel IC (PIC) will be considered in multirate systems. We will propose an iterative approach to do optimal power allocation with PIC in multirate systems. It is shown that the proposed power allocation algorithm can converge to the optimal solution quickly. Furthermore, it is demonstrated that when PIC is combined with optimal power allocation, the power dissipation will decrease and the system capacity will increase significantly