METHOD AND APPARATUS FOR TIMING RECOVERY IN DIGITAL DATA COMMUNICATIONS SYSTEMS
    131.
    发明授权
    METHOD AND APPARATUS FOR TIMING RECOVERY IN DIGITAL DATA COMMUNICATIONS SYSTEMS 失效
    方法及系统的数据传输系统卒中恢复。

    公开(公告)号:EP0532696B1

    公开(公告)日:1995-04-12

    申请号:EP91913779.4

    申请日:1991-05-23

    IPC分类号: H04L7/033

    摘要: In apparatus for receiving digital data signals in a digital communication system, especially an Integrated Services Digital Network, timing recovery problems associated with erratic zero crossing when multiple terminals transmit to a common receiver are mitigated by detecting the rate of change of the digital data signal between two predetermined positions (C1, C2) and controlling sampling of the digital data signal in dependence upon the difference between such rate of change and a reference. The rate of change conveniently corresponds to the trailing ''corner'' of a framing pulse (F), i.e. the point at which the signal commences the transition from one polarity to the other. The ''corner'' is much more stable, i.e. less susceptible to variation due to multiple terminal effects, than the zero-crossing which follows it, since the zero crossing may vary relative to the ''corner''. The transition may be determined by sampling the digital data signal at two discrete positions and determining when the two resulting samples differ in amplitude by a predetermined amount. One of the two pulses (C1, C2), namely the one with the larger amplitude (1), may then be used for data recovery.

    Low-power wireless system for telephone services
    135.
    发明公开
    Low-power wireless system for telephone services 失效
    用于电话服务的低功率无线系统

    公开(公告)号:EP0641135A2

    公开(公告)日:1995-03-01

    申请号:EP94117236.3

    申请日:1993-10-14

    IPC分类号: H04Q7/04 H04B7/26

    摘要: A small telephone system provides telecommunications services for personal wireless telephone sets over an area which is divided into service cells. Each of the cells is defined by reception characteristics of a plurality of radio base stations within the cell. During a call progress, if the wireless telephone set is mobile, a radio link with the set is handed off from one cell to another as the wireless telephone set moves along. The telephone system includes a service controller and a port being wireline connected between each radio base station and the service controller. The service controller selects radio base stations for setting up radio links with wireless sets of a calling or called persons, and responds to received signal strengths for handing a radio link from radio base station to radio base station, to maintain the quality of the radio link with an active mobile wireless telephone set.

    摘要翻译: 小型电话系统为划分为服务小区的区域上的个人无线电话机提供电信服务。 每个小区由小区内的多个无线电基站的接收特性定义。 在通话过程中,如果无线电话机是移动的,则随着无线电话机一起移动,具有该组的无线电链路从一个小区切换到另一个小区。 电话系统包括服务控制器和在每个无线电基站和服务控制器之间有线连接的端口。 服务控制器选择无线电基站以与主叫或被叫人的无线组建立无线电链路,并且响应于接收到的信号强度以将无线电链路从无线电基站交给无线电基站,以维持无线电链路的质量 与一个活跃的移动无线电话机。

    Wavelength division multiplex optical transmission system using optical amplification
    136.
    发明公开
    Wavelength division multiplex optical transmission system using optical amplification 失效
    OptischesÜbertragungssystemmitWellenlängenmultiplexierungund optischerVerstärkung。

    公开(公告)号:EP0637148A1

    公开(公告)日:1995-02-01

    申请号:EP94305617.6

    申请日:1994-07-28

    IPC分类号: H04B10/17

    摘要: In a wavelength division optical transmission system incorporating optical amplifiers, an identifying pilot tone is modulated on to each multiplexed wavelength. Each system amplifier determines from the pilot tones the total number of wavelengths being transmitted and thereby provides a corresponding adjustment of the amplifier gain. This prevents overamplification when one or more wavelengths is missing from the multiplexed signal e.g. as the result of a transmitter fault.

    摘要翻译: 在包含光放大器的波分光传输系统中,识别导频音被调制到每个复用波长。 每个系统放大器从导频音调确定正在发送的波长的总数,从而提供放大器增益的相应调整。 这防止了当从多路复用信号中丢失一个或多个波长时的过度放大。 作为发射机故障的结果。

    Handover method in a cellular mobile communication system
    137.
    发明公开
    Handover method in a cellular mobile communication system 失效
    在einem mobilen zellularen Kommunikationssystem的Verfahren zum Weiterreichen。

    公开(公告)号:EP0635990A2

    公开(公告)日:1995-01-25

    申请号:EP94305353.8

    申请日:1994-07-20

    IPC分类号: H04Q7/38

    CPC分类号: H04W36/30 H04W36/06

    摘要: A method of performing handover of a call associated with a mobile station (P2) in one cell (3) but moving towards another cell (2), which includes making a first attempt, using for example a MUX1 SNIFF procedure, on the channel allocated to the mobile station for that call, and if that attempt fails allocating the mobile station a different channel in the one cell (3) and making a second attempt. This different channel allocation (intracell handover) is performed even if there are no better signal characteristics achieved as a result. This procedure makes it more likely to be possible to achieve handover when a second mobile station (P1) associated with an adjacent cell (1) and operating on the same channel as the first mobile station (P2) is also within range of the basestation (5) of the other cell (2).

    摘要翻译: 一种在一个小区(3)中执行与移动站(P2)相关联但是朝向另一个小区(2)移动的呼叫的方法,其包括使用例如MUX1 SNIFF过程首先尝试在分配的信道上 并且如果该尝试未能在一个小区(3)中为移动台分配不同的信道,并进行第二次尝试。 即使没有获得更好的信号特性,也执行这种不同的信道分配(小区内切换)。 当与相邻小区(1)相关联并在与第一移动站(P2)相同的信道上操作的第二移动站(P1)也在基站的范围内时,该过程使得更可能实现切换) 5)的另一个单元(2)。

    METHOD AND APPARATUS FOR DECODING MANCHESTER ENCODED DATA
    139.
    发明公开
    METHOD AND APPARATUS FOR DECODING MANCHESTER ENCODED DATA 失效
    方法和装置对编码数据曼彻斯特。

    公开(公告)号:EP0613602A1

    公开(公告)日:1994-09-07

    申请号:EP92920413.0

    申请日:1992-09-30

    IPC分类号: H04L25 H04L7

    摘要: Un récepteur pour les données codées en code Manchester comporte une boucle de retour d'auto-étalonnage qui génère une impulsion d'horloge pour récupérer les signaux d'horloge et de données. La boucle de retour d'auto-étalonnage comprend une première ligne à retard numérique (12) échantillonnée par plusieurs bascules de type D (52) en fonction du signal d'horloge récupéré (RCLK) de manière à fournir un mot de contrôle CNT(O:N) indiquant le nombre d'éléments à retard numériques (50) nécessaires pour évaluer par approximations la moitié de la période d'horloge récupérée. Une seconde ligne à retard numérique (14), mise en correspondance par connexion (58) avec la première, fournit les trois-huitièmes d'un retard de période d'horloge. Le signal d'horloge retardé (DCLK) est dérivé de la suite de bits par échantillonnage en fonction des impulsions d'horloge (TPLS). Le signal de données décodées (RDATA) est dérivé de la suite de bits par multiplexage de l'entrée d'échantillonnage en fonction de l'impulsion d'horloge et du signal de données décodées.

    A non-interfering frequency plan for cellular communication systems
    140.
    发明公开
    A non-interfering frequency plan for cellular communication systems 失效
    用于细胞通信系统的非干扰频率计划

    公开(公告)号:EP0592207A3

    公开(公告)日:1994-09-07

    申请号:EP93307942.8

    申请日:1993-10-06

    发明人: Faruque, Saleh M.

    IPC分类号: H04Q7/04

    摘要: An improved method of assigning frequencies in an N=9 frequency plan so as to eliminate adjacent channels. The frequency plan disclosed reduces the effects of adjacent channel and co-channel interference and further enhances channel capacity.

    摘要翻译: 一种在N = 9频率计划中分配频率以便消除相邻信道的改进方法。 所公开的频率计划减少了相邻信道和同频道干扰的影响,并进一步增强了信道容量。