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18 条记录 (耗时 0.022 秒)

    Multichannel decoder
    4.
    发明授权
    Multichannel decoder 有权
    多声道解码器

    公开(公告)号：US06404828B2

    公开(公告)日：2002-06-11

    申请号：US09840775

    申请日：2001-04-24

    申请人： John D. Kaewell, Jr.

    发明人： John D. Kaewell, Jr.

    IPC分类号： H04L2706

    CPC分类号： H04L1/006 ,  H03M13/256 ,  H03M13/41 ,  H03M13/4107 ,  H03M13/4169 ,  H03M13/6502 ,  H03M13/6505 ,  H04B1/707 ,  H04B2201/70703 ,  H04B2201/70705 ,  H04L1/0009 ,  H04L1/0046 ,  H04L1/0052 ,  H04L1/0054 ,  H04L1/08

    摘要： A decoder decodes a plurality of received convolutionally encoded date signals simultaneously. At least two of the encoded data signals have a different data rate. The decoder receives undecoded I and Q symbols from the plurality of encoded data signals and outputs Euclidian distances corresponding to each encoded signal. Each data signal's distances are mapped on to a trellis. To output decoded symbols of each data signal, decisions are traced back in each data signal's trellis.

    摘要翻译： 解码器同时解码多个接收的卷积编码的日期信号。 至少两个编码数据信号具有不同的数据速率。 解码器从多个编码数据信号中接收未解码的I和Q符号，并输出对应于每个编码信号的欧几里德距离。 每个数据信号的距离映射到网格。 为了输出每个数据信号的解码符号，在每个数据信号的网格中追溯决策。

    Supervisory audio tone based carrier-to-interference measurement in a mobile cellular communication system
    5.
    发明授权
    Supervisory audio tone based carrier-to-interference measurement in a mobile cellular communication system 失效
    在移动蜂窝通信系统中基于监听音频的载波对干扰测量

    公开(公告)号：US5752190A

    公开(公告)日：1998-05-12

    申请号：US99503

    申请日：1993-07-30

    申请人： John D. Kaewell, Jr. ,  David M. Cooley

    发明人： John D. Kaewell, Jr. ,  David M. Cooley

    IPC分类号： H04W16/14 ,  H04W24/00 ,  H04W36/30 ,  H04W84/04 ,  H04W88/08 ,  H04Q7/22

    CPC分类号： H04W24/00 ,  H04W16/14 ,  H04W36/30 ,  H04W84/042 ,  H04W88/08

    摘要： A Supervisory Audio Tone (SAT) based Carrier-to-Interference (C/I) ratio measurement system uses the SAT tone to determine the desired signal to undesired interferers so that an intelligent hand-off decision can be made in a digital cellular communication system. The measurement is implemented by digital signal processors which allows additional signal processing and subsequently noise rejection over analog techniques. The received level of the desired SAT as well as the received levels of the SATs for the co-channel interferers is detected. The ratio of the desired SAT level to the sum of the undesired SAT levels provides the C/I measurement. By monitoring this C/I measurement, the base station can determine when to make a hand-off. This SAT based C/I measurement system also aids in the selection of a candidate cell to which the subscriber is handed-off. Surveillance receivers in the candidate cells make SAT based C/I measurements as well as Received Signal Strength Indication (RSSI) measurements. The cell with the most favorable channel conditions would be the cell to which the hand-off is made.

    摘要翻译： 基于监控音频（SAT）的载波干扰（C / I）比率测量系统使用SAT音调来确定期望的信号到不想要的干扰源，从而可以在数字蜂窝通信系统中进行智能切换决策 。 该测量由数字信号处理器实现，其允许额外的信号处理和随后的噪声抑制超过模拟技术。 检测所期望的SAT的接收电平以及同信道干扰源的SAT的接收电平。 所需SAT电平与不需要的SAT电平之和的比率提供C / I测量值。 通过监视该C / I测量，基站可以确定何时进行切换。 这种基于SAT的C / I测量系统还有助于选择用户被切换的候选小区。 候选单元中的监视接收器使基于SAT的C / I测量以及接收信号强度指示（RSSI）测量。 具有最有利的信道条件的小区将是进行切换的小区。

    Modulator having fractional sample/symbol time
    6.
    发明授权
    Modulator having fractional sample/symbol time 失效
    调制器具有分数采样/符号时间

    公开(公告)号：US5361046A

    公开(公告)日：1994-11-01

    申请号：US995486

    申请日：1992-12-22

    申请人： John D. Kaewell, Jr. ,  David M. Cooley

    发明人： John D. Kaewell, Jr. ,  David M. Cooley

    IPC分类号： G06F1/03 ,  H04L27/12 ,  H03C3/00 ,  H04L27/00 ,  H04L27/18

    CPC分类号： G06F1/0328 ,  H04L27/122

    摘要： A modulator capable of providing a fractional sample or symbol 995486 time employs a decimation counter (23) responsive to a clock having a frequency equal to M/N.times.(data symbol clock), where M is an interpolation factor and N is a decimation factor, for generating a data symbol clock to select FSK symbols from a sampled data array (21). A multiplier (26) receives the FSK symbols and multiplies the symbols by a weighting factor determined by the decimation counter. When the decimation counter wraps around due to a modulo M operation, a fractional weight is calculated for the current FSK symbol, then a new FSK symbol is selected, and then a fractional weight is calculated for the new FSK symbol. When the decimation counter has not wrapped, the full weighting, N, is output for the current FSK symbol.

    摘要翻译： 能够提供分数样本或符号995486时间的调制器响应于具有等于M / Nx（数据符号时钟）的频率的时钟来采用抽取计数器（23），其中M是内插因子，N是抽取因子， 用于产生数据符号时钟以从采样数据阵列（21）中选择FSK符号。 乘法器（26）接收FSK符号并将符号乘以由抽取计数器确定的加权因子。 当抽取计数器由于模M运算而包围时，计算当前FSK符号的分数权重，则选择新的FSK符号，然后计算新的FSK符号的分数权重。 当抽取计数器未包装时，输出当前FSK符号的全加权值N。

    Combination spatial diversity system
    7.
    发明授权
    Combination spatial diversity system 失效
    组合空间分集系统

    公开(公告)号：US4953197A

    公开(公告)日：1990-08-28

    申请号：US281186

    申请日：1988-12-08

    申请人： John D. Kaewell, Jr. ,  Nicholas C. Schreier ,  James J. Roller

    发明人： John D. Kaewell, Jr. ,  Nicholas C. Schreier ,  James J. Roller

    IPC分类号： H04B7/24 ,  H04B7/08 ,  H04B7/26 ,  H04Q7/00 ,  H04Q7/20

    CPC分类号： H04B7/082

    摘要： A spatial diversity system for digital mobile telephone networks which comprises at least two antennas, one antenna being part of a primary (or master) unit and the other being part of a diversity (or slave) unit, each unit having processing means to detect the "quality" of digital audio signals received by their respective antennas, the "quality" comprising link quality, AGC level and parity errors; the primary unit being capable of comparing the "quality" of the audio signals received by each antenna, selecting the higher "quality" signal and transmitting the higher "quality" signal to the telephone network.

    摘要翻译： 一种用于数字移动电话网络的空间分集系统，其包括至少两个天线，一个天线是主（或主）单元的一部分，另一个天线是分集（或从）单元的一部分），每个单元具有检测 由其各自天线接收的数字音频信号的“质量”，包括链路质量，AGC电平和奇偶校验错误的“质量” 主单元能够比较由每个天线接收的音频信号的“质量”，选择较高的“质量”信号并将较高的“质量”信号发送到电话网络。