Basic Study towards a Multi-media Microcellular Personal Communication System

多媒体微蜂窝个人通信系统的基础研究

基本信息

批准号：
04452184
负责人：
YOSHIDA Susumu
金额：
$ 3.78万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1993
项目状态：
已结题

项目摘要

Basic research towards the next generation multi-media personal communications has been performed. Major research results during 1992-1993 are summarized below.1. Based on the theoretical analysis and computer simurations, optimum carrier to co-channel interference ratio (C/I) maximizing the packet transmission throughput per unit cell and also an optimum cluster size have been clarified for a broadband cellular system subjected to multiupath fading.2. A new dynamic channel allocation algorithm with transmitter power control is proposed. It tries to allocate a channel to which subsequent power control can be applied most effectively. By properly selecting the power control range, this alogorithm has been confirmed to realize very low transmitter power, without sacrificing other perfomance compared to conventional algorithms.3. A simulation system to evaluate the reconstructed picture quality of the highly compressed still image when transmitted over a multipath fading channel has been developed. An unequal error protection scheme, which assigns more parity check bits for error correction to the more important infomation, has been applied to the JPEG-like still picture transmission, and shown to be very effective to improve the picture quality when the total bit rate is fixed.4. An automatic repeat request (ARQ) error control protocol which utilizes the redundancy of the still picture itself has been proposed and shown to be very effctive to improve the picture quality when transmitted over a fading channel.5. As an optimum receiver for the mobile radio channel with large multipath delay and co-channel interference, we proposed an extended MLSE equalizer with an enhanced co-channel cancelling capability by trellis coded modulation, and confirmed its superior performance.

已经进行了下一代多媒体个人通信的基础研究。 1992-1993年的主要研究成果如下： 1．基于理论分析和计算机模拟，对于遭受多路径衰落的宽带蜂窝系统，已经阐明了最大化每个单位小区的分组传输吞吐量的最佳载波同信道干扰比 (C/I) 以及最佳簇大小。2 。提出了一种新的带有发射机功率控制的动态信道分配算法。它试图分配一个可以最有效地应用后续功率控制的信道。通过正确选择功率控制范围，该算法已被证实能够实现非常低的发射功率，并且与传统算法相比不会牺牲其他性能。 3．已经开发出一种模拟系统，用于评估在多径衰落信道上传输时高度压缩的静止图像的重建图像质量。一种不等差错保护方案，为更重要的信息分配更多的奇偶校验位以进行纠错，已应用于类似 JPEG 的静态图像传输，并且在总比特率为固定.4.已经提出了一种利用静止图像本身的冗余性的自动重复请求(ARQ)差错控制协议，并且该协议被证明对于提高在衰落信道上传输时的图像质量非常有效。 5．作为具有大多径延迟和同信道干扰的移动无线信道的最佳接收器，我们提出了一种通过网格编码调制增强同信道消除能力的扩展MLSE均衡器，并证实了其优越的性能。