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58 条记录 (耗时 0.031 秒)

    Header error detection for wireless data cells
    23.
    发明授权
    Header error detection for wireless data cells 失效
    无线数据单元的标题错误检测

    公开(公告)号：US06628641B1

    公开(公告)日：2003-09-30

    申请号：US08997982

    申请日：1997-12-24

    申请人： Leo Strawczynski ,  Bill W. A. Gage

    发明人： Leo Strawczynski ,  Bill W. A. Gage

    IPC分类号： H04L1256

    CPC分类号： H04L49/555 ,  H04L49/3009 ,  H04L2012/5607 ,  H04L2012/5627

    摘要： An improved method and transceiver for using the method for detecting header errors includes a header processor for reconfiguring an ATM cell header by extracting the 8 bit header error check (HEC) and replacing it with an enhanced 16 or 24 bit HEC (EHEC). On the receive path, the received header is compared to the EHEC and if errors are indicated, the cell is discarded. Enhancements include FEC encoding on the entire cell during transmission, and if during reception uncorrectable errors exist using said EHEC to determine whether the error is in the header or is in the payload. If a cell with an error in its payload belongs to a group of related cells, for example an AAL5 frame, the system discontinues the transmission of the remaining cells of the frame.

    摘要翻译： 一种用于检测报头错误的改进方法和收发器包括一个报头处理器，用于通过提取8位报头错误检查（HEC）来重新配置ATM信元报头，并用增强的16位或24位HEC（EHEC）代替。 在接收路径上，将接收到的报头与EHEC进行比较，如果指示错误，则丢弃该单元。 增强包括在传输期间在整个小区上的FEC编码，并且如果在接收期间，使用所述EHEC来存在不可纠正的错误，以确定该错误是在报头中还是在有效载荷中。 如果其有效载荷中具有错误的小区属于一组相关小区，例如AAL5帧，则系统中断帧的剩余小区的传输。

    Unidirectional streaming services in wireless systems
    24.
    发明授权
    Unidirectional streaming services in wireless systems 有权
    无线系统中的单向流服务

    公开(公告)号：US06373842B1

    公开(公告)日：2002-04-16

    申请号：US09195400

    申请日：1998-11-19

    申请人： Paul Coverdale ,  Leo Strawczynski

    发明人： Paul Coverdale ,  Leo Strawczynski

    IPC分类号： H04L1256

    CPC分类号： H04L1/1848 ,  H04L1/1812 ,  H04L1/1838 ,  H04W28/14 ,  H04W80/00

    摘要： A high layer protocol organizes Unidirectional Streaming Services (USS) data into frames and said data is transmitted to the wireless user's terminal. The USS data is not delivered until a criteria is satisfied, e.g., the receive buffer is filled to an appropriate value. After the USS data is received, the receiver verifies the received frames. If an error is detected a message is sent from the wireless terminal to the server (providing the unidirectional streaming service) requesting retransmission of the corrupted frame. This is a form of ARQ protocol. If the retransmitted frame arrives prior to the time that frame needs to be delivered, the corrupted frame is replaced by the retransmitted frame. Otherwise, if the retransmitted frame is not received prior to the time that frame needs to be delivered, the corrupted frame is reconstructed. Any retransmitted frame which arrives too late is discarded. An additional benefit of the present invention is that since the frames are buffered prior to delivery, interpolation, as opposed to extrapolation, can be used to improve the reconstruction quality of the corrupted frame. This optional feature of the invention uses both the preceding and succeeding frames, which are available in the buffer, to provide a better estimate of the corrupted frame.

    摘要翻译： 高层协议将单向流服务（USS）数据组织成帧，所述数据被传送到无线用户的终端。 在满足标准之前USS数据不被传送，例如，接收缓冲器被填充到适当的值。 在接收到USS数据之后，接收机验证接收到的帧。 如果检测到错误，则从无线终端向服务器（提供单向流服务）发送请求重发已损坏帧的消息。 这是一种ARQ协议的形式。 如果重传的帧在需要传送帧的时间之前到达，则被重新发送的帧被替换。 否则，如果在需要传送帧的时间之前没有接收到重传的帧，则重建损坏的帧。 任何到达太晚的重发帧被丢弃。 本发明的另外的好处在于，由于帧在传送之前被缓冲，所以与外推相反的内插可以用于改善损坏的帧的重建质量。 本发明的该可选特征使用在缓冲器中可用的前一帧和后续帧来提供对损坏帧的更好估计。

    Fast forward link power control in a code division multiple access system
    25.
    发明授权
    Fast forward link power control in a code division multiple access system 失效
    快速连接功率控制在码分多址系统中

    公开(公告)号：US6154659A

    公开(公告)日：2000-11-28

    申请号：US998340

    申请日：1997-12-24

    申请人： Ahmad Jalali ,  Leo Strawczynski

    发明人： Ahmad Jalali ,  Leo Strawczynski

    IPC分类号： H04B7/005 ,  H04Q7/00

    CPC分类号： H04W52/24 ,  H04W52/12 ,  H04W52/225

    摘要： The radiotelephone demodulates the information received from the base station. The symbol-energy-to-noise-density (E.sub.s /N.sub.o) is estimated over a specified duration. This estimate is compared to a target E.sub.s /N.sub.o value. The target is updated periodically in order to maintain the quality of service. If the measured E.sub.s /N.sub.o is greater than the target, the radiotelephone sends a power down command over a reverse power control signaling channel to the base station. If the measured E.sub.s /N.sub.o is less than the target, the radiotelephone sends a power up command to the base station over the same channel. A multi-carrier transceiver system for a code division multiple access system includes circuitry for up-converting processed user data to a plurality of frequency channels. The transceiver, in some embodiments, further includes a plurality of antennas for transmitting each channel of user data. A method of using the multi-carrier system includes processing user data, and then transmitting the data at different frequency channels, and when necessary, transmitting the data through different antennas separated in space and/or having orthogonal polarization.

    摘要翻译： 无线电话机解调从基站接收的信息。 在特定持续时间内估计符号 - 能量噪声密度（Es / No）。 将该估计与目标Es / No值进行比较。 定期更新目标，以保持服务质量。 如果测量的Es / No大于目标，则无线电话机通过反向功率控制信令信道向基站发送掉电命令。 如果测量的Es / No小于目标，则无线电话机通过相同的信道向基站发送加电命令。 用于码分多址系统的多载波收发机系统包括用于将经处理的用户数据上转换为多个频率信道的电路。 在一些实施例中，收发器还包括用于发送用户数据的每个通道的多个天线。 使用多载波系统的方法包括处理用户数据，然后在不同频率信道上发送数据，并且在必要时，通过在空间中分离的和/或具有正交极化的不同天线发送数据。

    Multi-carrier CDMA communications systems
    26.
    发明授权
    Multi-carrier CDMA communications systems 失效
    多载波CDMA通信系统

    公开(公告)号：US6097712A

    公开(公告)日：2000-08-01

    申请号：US879773

    申请日：1997-06-20

    申请人： Norman P. Secord ,  Leo Strawczynski ,  Alberto Gutierrez ,  Ahmad Jalali

    发明人： Norman P. Secord ,  Leo Strawczynski ,  Alberto Gutierrez ,  Ahmad Jalali

    IPC分类号： H04L5/02 ,  H04B7/216 ,  H04L27/30

    CPC分类号： H04L5/026

    摘要： In a receiver of a simulcast multi-carrier CDMA (code division multiple access) communications system, a combined data signal is produced by combining signals representing data received for the plurality of carriers and is multiplied by the complex conjugate of a composite reference signal, representing characteristics of the plurality of carriers, produced by combining signals representing a reference signal received for the plurality of carriers, thereby improving multi-path resolution due to frequency diversity of the reference signal over the multiple carriers of the system. The receiver can be simplified by demodulating the signals of the plurality of carriers in common to produce a demodulated signal which is common to the data and reference signals for the plurality of carriers, the data and reference signals being subsequently separated using their respective orthogonal codes. Data signals can be recovered both with and without the improved multi-path resolution over the multiple carriers, and an optimum selection between them can be made.

    摘要翻译： 在联播多载波CDMA（码分多址）通信系统的接收机中，组合数据信号通过组合表示针对多个载波接收的数据的信号产生，并且乘以复合参考信号的复共轭，代表 通过组合表示为多个载波接收的参考信号的信号而产生的多个载波的特性，从而改善由于参考信号在系统的多个载波上的频率分集而导致的多径分辨率。 可以通过共同解调多个载波的信号来简化接收机，以产生对于多个载波的数据和参考信号共同的解调信号，随后使用它们各自的正交码分离数据和参考信号。 数据信号可以在多载波上具有和不具有改进的多径分辨率的情况下被恢复，并且可以在它们之间进行最佳的选择。

    Speech detector
    27.
    发明授权
    Speech detector 失效
    语音检测器

    公开(公告)号：US4410763A

    公开(公告)日：1983-10-18

    申请号：US271971

    申请日：1981-06-09

    申请人： Leo Strawczynski ,  Hing-Fai Lee

    发明人： Leo Strawczynski ,  Hing-Fai Lee

    IPC分类号： G10L11/02 ,  G10L1/00

    CPC分类号： G10L25/78

    摘要： Samples of a transmit path voice channel signal are averaged and compared with an adaptive speech threshold to determine the presence of speech. When the average falls below a fixed threshold, a timing circuit is triggered to time a delay period followed by a noise averaging period. The timing of these periods is aborted if either the transmit path average, or a similarly produced receive path average, exceeds the fixed threshold during either period. During the averaging period the voice channel signal is averaged, and at the end of this period the average noise level is used to determine the adaptive speech threshold, a predetermined level above the average noise level, the new adaptive speech threshold being stored. The stored adaptive speech threshold is not changed unless the timing of the delay and averaging periods is completed, ensuring that only the noise is averaged to determine the adaptive speech threshold.

    摘要翻译： 平均发送路径语音信道信号的样本，并与自适应语音阈值进行比较，以确定语音的存在。 当平均值低于固定阈值时，定时电路被触发以延迟延迟时间，随后是噪声平均周期。 如果传输路径平均值或类似产生的接收路径平均值在任一时期都超过了固定阈值，则这些周期的定时中止。 在平均时段期间，语音信道信号被平均，并且在该周期结束时，使用平均噪声电平来确定自适应语音阈值，高于平均噪声电平的预定电平，存储新的自适应语音阈值。 存储的自适应语音阈值不改变，除非延迟和平均周期的定时完成，确保只有噪声被平均以确定自适应语音阈值。