Iterative multiuser receiver for multiresolution broadcasting

An iterative multiuser receiver is proposed to decode a broadcast transmission with multiple rates. Multiple rates are used to provide a low-rate, minimum quality version to receivers with poor SNR and one or more higher definition versions to receivers with higher SNR. In the setup of this paper, different rates are encoded separately and detected by means of iterative interference cancellation and decoding. It is shown that such receiver implements a successive decoding strategy and its performance is evaluated by the code SNR gap to channel capacity, which is also used to derive the power distribution among different rates. Finally, results are verified by simulation.