Patent ID: 9215457
Filing Date: 2015-12-15
Classification: H03M,H04N

Abstract:
1. A method communicating multimedia data from a transmitter to a receiver, comprising the steps: encoding, in the transmitter, the multimedia data by a rateless encoder to produce encoded data using a degree distribution; transmitting the encoded data to the receiver via a channel, wherein the channel is subject to noise; decoding, in the receiver, an output of the channel by a decoder, wherein the decoder is a rateless decoder, and wherein the decoder is a random belief propagation decoder; transmitting, from the receiver to the transmitter, feedback of an in-process decoding status of the decoder at the receiver at an optimal feedback timing while receiving the encoded data; updating, in the transmitter, the degree distribution based on the feedback, such that the degree distribution varies over time; determining belief messages based on the decoder given the degree distribution; analyzing an entropy of the belief messages to determine an equivalent ripple size; optimizing the degree distribution having the equivalent ripple size using a regularized least-squares optimization; and iterating the steps of the determining the belief messages, analyzing the entropy and the optimizing until the degree distribution convergences to an optimal degree distribution.