STUDY ON MULTIMEDIA MOBILE INFORMATION NETWORK

通过移动无线电信道实现高速率和高可靠性多媒体通信的现实化，基本密钥技术已经被研究过。主要的研究结果已被总结为后续。干扰消除器，不仅取消了协同通道干扰，但也导致了严重的多路径传播导致的符号干扰，已经进行了研究。在特定的、trellis编码的干扰消除器（TCC）和简单的、强大的单用户类型干扰消除器已被提议并研究了TDMA和CDMA的细节，对此。一个动态信道分配算法，可用于综合通信量一致性的语音和数据，用于实例，已经提出。它的高级性能已被核实，以确定单时隙语音和三时隙数据流量。一个动态信道分配算法适用于不对称信道的上行链路和下行链路流量并不平衡，已经研究了TDMA/TDD系统。通过分配更多的频道到重型交通方面，在上下链接之间，更好的性能得到了确认。在高度压缩的图像传输中，可变长度编码经常被使用。这就是为什么，很可能会失去帧同步和突发错误的发生。我们建议合并错误弹性入口编码（EREC）和不相等的错误保护编码，并确认其优越性能。在移动图像传输中，帧预测编码经常被使用。错误倾向于通过成功的框架传播。因此，为了防止错误传播，一个基于ARQ的错误控制方案，该ARQ采用了估计源编码的优势进入帐户已被提议，其高级性能已被确认。

Towards the realization of high rate and highly reliable multi-media communication over mobile radio channel, basic key techniques have been studied. Major research results are summarized as follows.・ Interference canceler, not only canceling co-channel interference but also overcoming severe intersymbol interference caused by multipath propagation, has been studied. In particular, trellis coded interference canceler (TCC) and simple yet poweful single-user type interference canceler have been proposed and studied in detail for TDMA and CDMA,respectively.・ A dynamic channel allocation algorithm suitable for integrated traffic consisting of voice and data, for instance, has been proposed. Its superior performance has been verified assuming single slot voice and three slot data traffic.・ A dynamic channel allocation algorithm suitable for an asymmetric channel where up-link and down-link traffic are not balanced has been studied assuming TDMA/TDD system. By allocating more channels to the heavier traffic side between up and down links, better performance has been confirmed.・ In highly data compressed image transmission, variable lenght coding is frequently used. It is, therefore, likely to lose frame synchronization and bursty errors occur. We have proposed to combine error resiliant entropy coding (EREC) and unequal error protection coding, and confirmed its superior performance.・ In moving image transmission, interframe predictive coding is often used. Errors tend to propagate through the succeeding frames. Thus, to prevent error propagation, an error control scheme based on ARQ which takes the advantage of the assumed source coding into account has been proposed, and its superior performance has been confirmed.