逻辑信道

基于模糊多目标决策的UWB逻辑信道选择

Selection of UWB Logical Channel Based on Fuzzy Multi-Objective Decision Making

远程过程调用RPC是构成分布式系统的有力工具，同时也是分布式系统中一种流行的进程迁移通信机制，它试图在进行会话的应用程序间建立一条逻辑信道，实现信息交换。

Remote procedure call ( RPC ) is a powerful tool for developing distributed system and a popular process communicating mechanism as well . With RPC , a logical channel can be built between the applied programmes which try to communicate with each other in order to fulfill information exchange .

UE对优先级相同的逻辑信道应该平等处理。

Logical channels configured with the same priority shall be served equally by the UE .

逻辑信道到传输信道的映射关系取决于RRC层配置的复用关系。

The mapping of logical channels on transport channels depends on the multiplexing that is configured by RRC .

该系统基于多机协同数据流模型，采用分层耦合设计结构、对象化抽象和XML格式的交互描述，支持对高速多链路逻辑信道测量与新测量功能的可扩展性。

This platform 's design uses data flow model of multi-processor system , layered coupling framework , object-oriented abstraction and XML formatted intercommunication to make it much easier to support high speed multi-link logic channel measurement , and to add new measuring function when needed .

为了使脉冲均匀的分布在时域上，IR-UWB系统一般采用跳时序列控制脉冲发送的时刻，不同的跳时序列确定了不同的跳时逻辑信道，数据传输可以在不同的跳时信道上同时进行。

In order to transmit pulse signal uniformly on the time domain , IR-UWB system uses the time-hopping sequence to control the transmission of pulse .

在MAC子层中将完成逻辑信道和传输信道之间的相互映射，并根据逻辑信道的资源速率为传输信道选择合适的传输格式等功能，所以研究MAC层是很有必要的。

MAC layer will complete function mapping between logical channels and transport channels and selection of appropriate Transport Format for each Transport Channel depending on instantaneous source rate and so on . It is necessary to study MAC layer .

文中主要介绍PHS空中接口的帧结构、逻辑信道、协议结构和呼叫流程，对其中的重点和难点进行简要分析和总结。

This paper mainly discusses the PHS air interface including its frame architecture , logic channel , protocol architecture and call procedures . The key points and difficulties of the air interface are analyzed and summarized .

245作为媒体控制协议，呼叫建立过程和媒体逻辑信道建立过程相分离，建立RTP会话之前需要交换大量的信令消息，会话建立时间长；

The Process of establishment of call and media logical channel are separate . The exchange of a large number of signaling messages is required before RTP session is established . So , it takes long time to establish the session .

通过传输两个逻辑信道，分别实现快速同步捕获和高速信息传输。

Data and synchronization information are transmitted in data and assistant channel respectively .

每次传输新数据时，都会进行逻辑信道优先级划分。

The Logical Channel Prioritization procedure is applied when a new transmission is performed .

本协议通过使用分割与重新装配并通过在单一信息包中组合来自不同逻辑信道的信息来提供低延迟和低开销。

This protocol provides low delay and low overhead by using segmentation and reassembly and by combining information from different logical channels in a single packet .

终端信息消息不仅包括来自接收端的通信方式优先级、逻辑信道信令、控制与指示，而且也包括接收和传输能力。

The messages cover receiving and transmitting capabilities as well as mode preference from the receiving end , logical channel signalling , and Control and Indication .

245媒体控制信道，或者通过快速连接和隧道机制，建立一条或多条逻辑信道。H。

The other is to realize call signalling protocol , that is to establish H.245 media control channel , or by fast connect procedure and Tunnelling mechanism to establish one or more logical channels .

仿真结果表明，基于非单点模糊逻辑系统的信道均衡器能够有效地遏制信道的时变性和随机噪声干扰，可有效地解决数字信道的非线性畸变问题；

An adaptive non-singleton fuzzy filter is investigated and analyzed for nonlinear communications channel ( equalization ) to solve its stability of digital transmission . Simulation results show that the proposed method can resist time-varied factors and stochastic noise , and solve nonlinear aberration effectively .

非单点模糊逻辑系统在非线性信道均衡中的应用

Nonlinear communications channel equalization based on non-singleton fuzzy logic system