A novel architecture for robust video transmission in MC-CDMA cellular networks over slow fading channels

Abstract

Reliable interactive video transmission in CDMA cellular networks is difficult since residual channel errors cannot be avoided and the available bandwidth is scarce. In order to improve quality of the decoded video, this paper introduces a novel architecture for reliable transmission in multicode DS-CDMA (MC-CDMA) systems. Unlike previous protection schemes, the new architecture not only improves video quality, but it also achieves an efficient use of the available resources in the network. As an application of this concept, we propose a robust scheme for reliable video communication from wired users to mobile users in slow fading environments. Our approach consists of two main ingredients: a novel closed-loop error control technique to reduce packet loss and interference, and a new scheme to stop error propagation in the decoded sequence originating from residual channel errors. Based both on theoretical analysis and numerical results, we show that our approach achieves important improvements in the quality of the decoded video with low additional complexity.