3 ) the new types of photonic devices based on sampled grating : multiple wavelength laser , wavelength multiplexer / demultiplexer , reconfigurable optical add / drop multiplexer , optical fiber sensor , and multiple channels dispersion compensator 3 )取样光栅构成的新型光子学器件：多波长激光器、波分复用解复用器、重构型光分插复用器、光纤传感器及多信道色散补偿器在光纤通信中的应用前景。
Without the central switch a lot of channels and tracks are shared by many users , the cost of the channels is reduced and the utilization factor of them is improved . user can call others by dialing the number , and the dialing is simple and quick 本文给出了有限用户的呼损率公式和有限用户多信道共用系统的信道配置方法，并可根据实际话务量、系统用户数、呼损率配置共用绳路数和中继线对数。
The author analyzed layered coding , multi description coding , technology of recover and hiding of errors , providing the approach " a approach of a multi description coding base on space domain dividing " , and then give a experiment to testify it 作者在文中较为详细的分析介绍流媒体编码中的分层编码、多描述编码和错误恢复隐藏机制,提出“基于空域分离多信道的多描述编码方案” ,并佐以实验数据验证。
The source and the regularity of deviation when erlang b formula or the corresponding channel utilization ratio formula is used in a limited user system is dissected , and the condition available of the two groups of formulas are pointed out 由此不仅揭示了爱尔兰b公式和相应信道利用率公式用于有限用户系统时会有较大偏差的根源，剖析了偏差的规律性，而且得到了适用于有限用户多信道共用系统的修正公式。
Adopting the technique of the multi - channel share which has already been widely used in communication fields such as satellite communication and mobile communication is an effective method to increase the capacities of communication system and the utilization factor of the channels 多信道共用技术是提高通信系统容量和信道利用率从而实现信道扩容的一种有效方法，现已在卫星通信、移动通信等通信领域中得到应用。
In this thesis , the multi - channel sharing system is considered as a stochastic service system . based on the steady state solution of the birth and death process which state space is a limited set , utilized m / m / n / n / m queue model , the call congestion ratio formula and the channel utilization ratio formula fitting to the limited user system are derived . drawing support from the visual data analyzing function of the software matlab , the value divergence between the formulas and the corresponding one fitting to the infinite user system are compared 本文将多信道共用通信系统视为一个随机服务系统，根据有限状态生灭过程的稳态解，利用m m n n和m m n n m两类排队模型，分别推导出了无限用户和有限用户两类多信道共用系统的呼损率公式和信道利用率公式；借助于matlab的可视化数据分析功能，比较了这两组公式在数值上的差异；指明了两组公式的适用条件。
Telephone communication is the most widely employed ways of communication in the world . telephone communication is becoming more and more important as the national economic reform deepens . dynamic channel borrowing assignment mode is an effective method in communication channel expansion . although it has been put into practical use in satellite communication and mobile communication , no one has attempted to apply it to telephone line expansion . in this paper the author expands the telephone line via dynamic channel borrowing assignment mode , ascertains the expansion scheme , designs the circuit of hardware in telephone line expansion device , draws up software programme , analyses the call lose after using the expansion device theoretically and then experiments to verify it . eight subscribers can share one or two telephone lines with the help of the telephone line expansion device with each phone a sole number . this makes it possible for subscribers to use any free telephone line . thus increasing the number of subscriber and utilization ration of telephone line . in addition . this project makes it possible for expansion subscribers to communicate directly while not to make use of outer line . which further decreased the system call lose 多信道共用是通信通道扩容的一种有效的方法，已在卫星通信、移动通信中得到应用，但尚未应用到电话线路扩容中。本文利用多信道共用原理对电话线路进行扩容，确定了多信道共用方式电话线路扩容的设计研究方案，研究设计了电话线路扩容器的硬件电路，编制了电话线路扩容器的软件，并对使用电话线路扩容器后的呼损进行了理论分析及试验研究。本文研究设计的多信道共用方式电话线路扩容器可以使8个用户共用1 2对电话线路，每部用户话机都具有独立的电话号码，可以利用任一空闲的电话线路，故能够增加电话用户，提高电话线路的利用率。
In this article , based on the knowledge of stochastic process and combined with the software matlab , the configuration of shared lines for the limited users system is simulated and analyzed , and the relationship among the call congestion ( b ) , the shared ! ines ( n ) , the users ( m ) , the traffic ( a ) and the utilization factor of telephone lines is confirmed . according to the principle , the method of optional configuration of the shared lines is proposed 本文利用随机过程理论知识，结合matlab软件对有限用户系统中多信道共用的共用线路配置进行可视化仿真、分析和研究，确定了呼损b与共用线路数n 、扩容用户数m 、话务量a及线路利用率之间的关系，给出共用线路的最优配置方法。
For power control of listening users , forward power control method are introduced based on full , multichannel , filtered report , and collision method etc . the full report method has redundancy report information , and its real - time performance is bad , multichannel report is introduced to improve the real - time performance , and filtered report is introduced to eliminate the redundancy information , finally the collision method introduced can not only get higher real - time performance but also diminish the redundancy information ; 2 . in order to meet the requirements of making the dynamic simulation of trunking group system , the ms ’ s random move equation is brought forward , the simulation of ms ’ s distribution is done and the integrated channel model are presented ; 3 . the smart predicative model of power control is introduced to overcome the delay and track the change of the complicated network , with this model , the power control ‘ s performance is greatly improved 全汇报方法存在冗余的汇报信息,而且实时性较差,为了改善实时性提出了多信道的汇报方式,为了改善冗余汇报而提出了筛选法,最后介绍的碰撞法在减少冗余信息的同时又提高了实时性;二、为了集群功率控制动态仿真的需要,提出了移动台的随机运动方程,进行了有关移动台的分布仿真,建立了综合的信道模型;三、希望克服延时和跟踪复杂网络环境变化,提出了功率控制的智能预测模型,通过智能预测模型可以改善功率控制的性能,着重介绍了采用神经网络的方法实现智能预测的通用模型,从而跟踪复杂多变的无线环境,诸如慢衰落及快衰落(包括多径衰落、多普勒效应所引起的衰落)等网络特征,达到预测功率需求;四、采用二级正交码和智能天线(空分多址)的方法进行组内用户的识别,改进功率控制效果;五、话权用户的前向和反向功率控制方法;六、对引入gota的cdma系统提出了复合容量表示方法,并作容量分析,探讨有关gota系统的qos问题。
The technique of the multi - channels sharing and the bus topological structure are adopted in the system , which does n ' t set the central switch and which not only can realize many users share a few explosion - proof channels , but also reduce the cost of the channels , while improving the utilization factor of them . the users " extension is flexible and convenient . the system has the functions of amplifying call and telephone talk 该系统不设主机，采用多信道共用技术和总线式拓扑结构，实现多用户共用少数防爆绳路，降低了绳路成本且提高了利用率；用户扩展灵活、方便：具有扩音呼叫和电话对讲功能；工程布线简单，费用低，工期短。
