Precoding Matrix Design in Linear Video Coding

Linear video coding (LVC) is a promising alternative to classical video coding when video has to be transmitted to wireless receivers experiencing different and time-varying channel conditions. This paper addresses the LVC channel precoding and decoding matrix design when the transmission channel consists of several sub-channels, each with its own power constraint. Such constraints may be found, e.g., in multi-antenna, DSL, or powerline transmission systems. In a previous paper, it has been shown that this matrix design problem may be addressed by an adaptation to LVC of a multi-level water-filling solution proposed for MIMO channels. Here, two suboptimal low-complexity multi-level water-filling techniques are proposed, with different trade-offs between complexity and efficiency. Extensive simulations show that the suboptimal solutions perform very close to the optimal one, with a sensibly reduced complexity.