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287 条记录 (耗时 0.02 秒)

    CDMA TRANSMITTING APPARATUS AND CDMA RECEIVING APPARATUS
    45.
    发明公开
    CDMA TRANSMITTING APPARATUS AND CDMA RECEIVING APPARATUS 有权
    CDMA传输装置及CDMA接收设备

    公开(公告)号：EP1551124A4

    公开(公告)日：2008-03-12

    申请号：EP03772765

    申请日：2003-11-14

    申请人： MATSUSHITA ELECTRIC IND CO LTD

    发明人： SUDO HIROAKI

    IPC分类号： H04J99/00 ,  H04B7/04 ,  H04B7/06 ,  H04B7/08 ,  H04J11/00 ,  H04J13/00 ,  H04J13/16 ,  H04L1/00 ,  H04L1/18

    CPC分类号： H04L1/0003 ,  H04B2201/70703 ,  H04L1/18

    摘要： An S/P converting part (101) converts input signals (A1,A2,B1,B2,...K1,K2) to be transmitted into parallel data that have been separated for transmitting systems. Spreading parts (102,103) spread, under the control of a spreading control part (107), the respective data. Adding parts (104-1,104-2) multiplex the spread data. Transmitting parts (105-1,105-2) subject the multiplexed signals to radio transmission processings, and radio-transmit these data via antennas (106-1,106-2). The spreading control part (107) controls, based on a line quality, the spreading manners in the spreading parts (102,103). In this way, when different data are transmitted from the respective antennas, the frequency utilization efficiency can be maintained, while the received-data error rate characteristic can be improved.

    OFDM transmission/reception system and transmitting/receiving apparatus
    48.
    发明公开
    OFDM transmission/reception system and transmitting/receiving apparatus 失效
    OFDM发送和接收系统，和发送和接收装置

    公开(公告)号：EP0729250A3

    公开(公告)日：1998-12-09

    申请号：EP96102753

    申请日：1996-02-23

    申请人： TOSHIBA KK

    发明人： SEKI TAKASHI ,  TAGA NOBORU ,  OKITA SHIGERU

    IPC分类号： H04L27/18 ,  H04J11/00 ,  H04J13/00 ,  H04J13/16 ,  H04L27/26 ,  H04L5/06

    CPC分类号： H04L27/2657 ,  H04L27/2613 ,  H04L27/2675 ,  H04L27/2688

    摘要： This invention improves the frequency acquisition range and the resistance to multipath interference. In a digital signal transmission system using OFDM, on the transmission side, some or all of a plurality of equidistant carrier positions are treated as reference carrier positions. The actual transmitted carriers are arranged in a predetermined pattern non-equidistant to the frequency carrier positions to form an OFDM symbol. This OFDM symbol is periodically transmitted as frequency reference symbols. On the reception side, the carrier arrangement pattern of the frequency reference symbols is detected, a carrier frequency offset is detected from the detected pattern offset, and the carrier frequency is compensated based on the frequency offset.

    SPREAD-SPECTRUM SYSTEM AND METHOD
    49.
    发明公开
    SPREAD-SPECTRUM SYSTEM AND METHOD 失效
    EINRICHUNG UND VERFAHREN ZUR SPEKTRUMSPREIZUNG

    公开(公告)号：EP0801856A4

    公开(公告)日：1998-10-21

    申请号：EP95943981

    申请日：1995-12-22

    申请人： INTERDIGITAL TECH CORP

    发明人： LOMP GARY R

    IPC分类号： G06F17/10 ,  H03G3/30 ,  H04B20060101 ,  H04B1/04 ,  H04B1/707 ,  H04B1/709 ,  H04B1/7093 ,  H04B1/7115 ,  H04B1/712 ,  H04B7/005 ,  H04B7/26 ,  H04J13/00 ,  H04J13/10 ,  H04J13/16 ,  H04W52/22 ,  H04W52/36 ,  H04W52/52 ,  H04W84/00 ,  H04K1/00 ,  H04B15/00 ,  H04L27/30

    CPC分类号： H04W52/04 ,  H03G3/3042 ,  H03G3/3047 ,  H04B1/69 ,  H04B1/707 ,  H04B1/709 ,  H04B1/7093 ,  H04B1/7115 ,  H04B1/712 ,  H04B2201/70707 ,  H04J13/00 ,  H04J13/0003 ,  H04J13/10 ,  H04J13/16 ,  H04W52/22 ,  H04W52/221 ,  H04W52/225 ,  H04W52/228 ,  H04W52/36 ,  H04W52/362 ,  H04W52/367 ,  H04W52/52 ,  H04W52/54

    摘要： A spread-spectrum system and method for providing high-capacity communications through multipath compensation, for automatically and adaptively controlling a mobile user's spread-spectrum transmitter power level when operating in a cellular communications network, and for providing variable or adjustable signal bandwidth capabilities in a spread-spectrum transmitter. Multipath compensation is accomplished using a plurality of filters (121-126), a plurality of multipliers (111-116), and a plurality of weighting devices (131-136), coupled through a first adder (120) and a second adder (130) to a decision device (150). The adaptive power control device of the present invention includes a base station having an AGC amplifier (228), despreader (231), comparator (239), power amplifier (237), delta modulator (235), multiplexer (234), combiner (236) and power measurement device (233). The adaptive power control device also includes a mobile station having a despreader (334), demultiplexer (339), demodulator (340), decision device (345), accumulator (346), step size algorithm device (344), variable gain device (341) and transmitter (342). The variable bandwidth device includes a chipping sequence generator (161), impulse generator (165), product device (164) and filter (166).

    摘要翻译： 一种用于通过多路径补偿提供高容量通信的扩频系统和方法，用于在蜂窝通信网络中工作时自动和自适应地控制移动用户的扩频发射机功率电平，并且用于在一个蜂窝通信网络中提供可变或可调节的信号带宽能力 扩频发射机。 使用通过第一加法器（120）和第二加法器（120）耦合的多个滤波器（121-126），多个乘法器（111-116）和多个加权装置（131-136） 130）到决策装置（150）。 （228），解扩器（231），比较器 236）和功率测量装置（233）。 自适应功率控制设备还包括具有解扩器（334），解复用器（339），解调器（340），判定设备（345），累加器（346），步长算法设备（344），可变增益设备 341）和发射器（342）。 可变带宽设备包括码片序列生成器（161），脉冲生成器（165），产品设备（164）和滤波器（166）。

    METHOD AND DEVICE FOR RECEIVING CODE-DIVISION MULTIPLEX SIGNAL
    50.
    发明公开
    METHOD AND DEVICE FOR RECEIVING CODE-DIVISION MULTIPLEX SIGNAL 失效
    方法和设备，用于接收码分复用信号

    公开(公告)号：EP0721264A4

    公开(公告)日：1997-11-05

    申请号：EP95921994

    申请日：1995-06-20

    申请人： NIPPON TELEGRAPH & TELEPHONE

    发明人： MIKI YOSHINORI ,  SAWAHASHI MAMORU

    IPC分类号： H04B1/707 ,  H04J13/10 ,  H04J13/16 ,  H04J13/02

    CPC分类号： H04B1/7105 ,  H04J13/10 ,  H04J13/16

    摘要： A compression-back section (32) compresses back spread-spectrum signals received from K users through L transmission lines based on the spread-spectrum codes assigned to the users and a reverse correlation filter (33) eliminates interference components between signal components of compressed-back signal vectors z. A pilot detecting section (34) detects pilot signals from the signal vectors, from which the interference components have been eliminated, over a plurality of frames and a transfer function interpolating section (35) finds transfer functions by dividing the detected pilot signals by the known symbols of the pilot signals and determines transfer functions between adjacent pilot signals from the transfer functions of the adjacent pilot signals. The compressed-back signal vectors (z) are supplied to another reverse correlation filter (36) and the interference between signal components are eliminated from the vectors z and, at the same time, transmission distortion is eliminated by using the determined transfer functions, thus generating KL signal components. A phase-correcting and synthesizing section (37) generates K synthesized signals by combining L signal components for each user and a discriminating section (38) discriminates the levels of the synthesized signals and reproduces K symbols from K users.