Hybrid Group Decoding for Scalable Video over MIMO-OFDM Downlink Systems
The authors propose a scalable video broadcasting scheme over MIMO-OFDM systems. The scalable video source layers are channel encoded and modulated into independent signal streams, which are then transmitted from the allocated antennas in certain time-frequency blocks. Each receiver employs the successive group decoder to decode the signal streams of interest by treating other signal streams as interference. The transmitter performs adaptive coding and modulation, and transmission antenna and subcarrier allocation, based on the rate feedback from the receivers. They also propose a hybrid receiver that switches between the successive group decoder and the MMSE decoder depending on the rate.