Research on The Spread Spectrum Communication Systems.

从1988年4月至1990年3月，共举行了8次研究会议，研究的主要结果总结如下：提高信息传输容量是当前扩频系统面临的重要问题之一。在这一领域进行了各种研究工作，长冈工业大学的g.m arubayashi和S.Tachikawa表明，采用Mary SS系统可以提高传输能力。M.Hatori （university of Tokyo）和N.Suehiro （Tokyo Engineering university）利用多相正交序列提出了一种高效的SSMA（扩频多址）系统。Y.Tanada（鹿儿岛大学）提出了一种利用实数正交序列的高效SSMA系统。T.Hasegawa（埼玉大学）提出了一种采用芯片移位方法的同步SSMA系统。为SS系统寻找新的应用领域也是当前的一个重要问题。在这个领域已经进行了一些研究工作，g.m arubayashi和S.Tachikawa研究了电力线数据传输的应用。M.Nakagawa（庆应义塾大学）展示了应用于数据载体系统的可能性。Y.Miyazaki（丰桥工业大学）研究了光通信系统的应用。一些研究人员正在研究使用弱无线电波的消费者通信系统的应用。人们提出了各种新颖的电路和系统设计技术。H.Imai和R.Kohno（横滨国立大学）展示了使用广义Geffe序列实现高速同步采集系统的可能性。长谷川用曼彻斯特代码提出了一个改进的DLL电路。mori（庆应义塾大学）提出了一种高效的高速频率合成器。通过这些研究工作，扩频系统的未来可能性似乎大大增加。

From April 1988 to March 1990 , study meetings have been held for eight times major results of the studies are summarized as follows.To increase the information transmission capacity is one of most important problems in the present day Spread Spectrum (abbr. SS in the following) systems. Various study works have been conducted in this field.G.Marubayashi & S.Tachikawa ( Nagaoka Univ. of Technology ) showed a possibility of improving transmission capacity by adopting Mary SS system. M.Hatori ( Univ.of Tokyo ) & N.Suehiro (Tokyo Engineering Univ.) proposed an efficient SSMA ( Spread Spectrum Multiple Access ) system using polyphase orthogonal sequence. Y.Tanada (Kagoshima Univ.) proposed an efficient SSMA system using real number orthogonal sequence. T.Hasegawa (Saitama Univ.) proposed a synchronous SSMA system using chip shift method.To find new application fields for the SS systems is also an important problem in the present state. Several research works have been conducted in this field.G.Marubayashi & S.Tachikawa studied applications for the electrical power line data transmission. M.Nakagawa (Keio Univ.) showed a possibility of application to the data carrier system. Y.Miyazaki (Toyohashi Univ.of Technology) investigated an application to the optical communication system.Applications to the consumer communication systems using weak radio wave are investigated by several research workers.Various novel circuit and system design techniques have been proposed. H.Imai & R.Kohno ( Yokohama National Univ.) showed a possibility of high speed synchronous acquisition system using generalized Geffe sequence. T.Hasegawa proposed an improved DLL circuit using the manchester code. S.Mori ( Keio Univ.) proposed an efficient high speed frequency synthesizer.Through these research works , future possibilities of the Spread Spectrum Systems seems to have enhanced greatly.