SPS: Multiple Description Coding with Correlating Transforms for Multiple Antenna Wireless Systems

在通信系统中为多媒体传输提供容错能力的一种有效方法是多描述编码（MDC），它假设在发送端和接收端之间存在多个独立的信道，每个信道可以暂时关闭或经历突发错误。使用MDC可以生成多个编码流（称为描述），并通过不同的通道传输。在目的地，如果接收到的所有流都没有错误，那么信号就可以以最高的保真度重建。然而，如果仅以可用的形式接收到一个或几个描述，接收器仍然可以重构可接受的信号。迄今为止的所有多个描述编码方法都假定发射器和接收器之间的开关信道模式；每个链路要么中断，在这种情况下，传输的符号或数据包完全丢失，要么正常工作，在这种情况下，数据包被毫无错误地接收。这种模式适用于Internet传输，但不适用于无线信道。本研究用一种无线信道模型，如瑞利衰落模型，取代了独立开关信道模型中的并行模型。在信道上使用多个发射和接收天线进行通信。在这些模型中，任何接收天线的信号都是来自每个发射天线的发射信号的叠加。因此，即使接收端的描述是完全独立的，每个天线接收到的信号也会包含来自每个描述的一些信息。本研究包括寻找这些信道的最佳多重描述编码策略，该方案的理论限制，以及效率

Proposal #131855Altunbasak, YucelGA Tech Res. Corp - GITAn effective way of providing error resilience for multimedia transmission in a communication system with a relatively small reduction in efficiency is multiple description coding (MDC), which assumes the existence of multiple independent channels between the transmitter and receiver, each of which can be temporarily down or can experience burst errors. With MDC several coded streams, called descriptions, are generated and transmitted over different channels. At the destination, if all of the streams are received error free, then the signal can be reconstructed at its highest level of fidelity. However, if only one or a few descriptions are received in a usable form, the receiver can still reconstruct an acceptable signal. All multiple description coding methods to date assume an on-off channel mode between the transmitter and the receiver; each link is either broken, in which case the transmitted symbols, or packets, are lost completely, or it functions properly, in which case the packets are received free of errors. This model is appropriate for Internet transmission, but it is not appropriate for wireless channels.This study replaces the parallel in independent on-off channel model with a wireless channel model, such a Rayleigh fading model. Communication is performed using multiple transmit and received antennas over the channel. With these models the signal at any of the receive antennas is the superposition of the transmitted signals from each transmit antenna independently faded. Therefore, even if the descriptions at the receiver side are completely independent, the received signal at each antenna will include some information from each description. This research involves finding the best multiple description coding strategy for these channels, the theoretical limits of such a scheme, and the efficiency