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    Methods and apparatus of power control in wireless communication systems
    1.
    发明授权
    Methods and apparatus of power control in wireless communication systems 失效
    无线通信系统中功率控制的方法和装置

    公开(公告)号：US07420939B2

    公开(公告)日：2008-09-02

    申请号：US10641308

    申请日：2003-08-13

    申请人： Rajiv Laroia ,  Junyi Li ,  John L. Fan ,  Sundeep Rangan ,  Prashanth Hande

    发明人： Rajiv Laroia ,  Junyi Li ,  John L. Fan ,  Sundeep Rangan ,  Prashanth Hande

    IPC分类号： H04B7/185

    CPC分类号： H04W52/08 ,  H04L27/2608 ,  H04L27/362 ,  H04W52/56 ,  H04W52/60

    摘要： The present invention involves apparatus and methods to perform wireless terminal transmission power control. The invention uses novel and highly efficient methods to: convey power control information, specify power control level adjustments, recognize power control information, limit interference in the power control signaling, and recognize corrupted power control signaling, thus conserving wireless terminal energy and minimizing power control signaling and associated bandwidth. Base stations send analog power control command signals, with a continuous range of control levels, to wireless terminals for transmission power adjustments. Power control signals include two components which can be used to convey information, e.g., power control commands, signal quality, device identity information. For zero power adjustment, the control component signal is not transmitted. For a non-zero adjustment, power control signals are sent using control ranges and limits, known to the base station and wireless terminal, with the scaling adjusted or synchronized based upon feedback information.

    摘要翻译： 本发明涉及执行无线终端传输功率控制的装置和方法。 本发明使用新颖且高效的方法：传送功率控制信息，指定功率控制电平调整，识别功率控制信息，限制功率控制信令中的干扰，并识别损坏的功率控制信令，从而节省无线终端能量并最小化功率控制 信令和相关带宽。 基站向无线终端发送模拟功率控制命令信号，具有连续的控制级别，用于传输功率调整。 功率控制信号包括可用于传送信息的两个组件，例如功率控制命令，信号质量，设备身份信息。 对于零功率调整，控制分量信号不发送。 对于非零调整，功率控制信号使用基站和无线终端已知的控制范围和限制，基于反馈信息进行缩放调整或同步。

    Pilot signals for use in multi-sector cells
    2.
    发明授权
    Pilot signals for use in multi-sector cells 有权
    用于多扇区单元的导频信号

    公开(公告)号：US09544860B2

    公开(公告)日：2017-01-10

    申请号：US10648767

    申请日：2003-08-25

    申请人： Rajiv Laroia ,  John L. Fan ,  Junyi Li

    发明人： Rajiv Laroia ,  John L. Fan ,  Junyi Li

    IPC分类号： H04W52/04 ,  H04B15/00 ,  H04W52/32 ,  H04B7/04 ,  H04W16/24 ,  H04W52/24 ,  H04B17/24 ,  H04B17/309

    CPC分类号： H04W52/325 ,  H04B7/0491 ,  H04B17/24 ,  H04B17/309 ,  H04W16/24 ,  H04W52/24

    摘要： Pilot signal transmission sequences and methods for use in a multi-sector cell. Pilots in different sectors are transmitted at different known power levels. In adjacent sectors a pilot is transmitted while no pilot is transmitted in the adjoining sector. This represents transmission of a NULL pilot signal. A cell NULL is also supported in which NULL pilots are transmitted in each sector of a cell at the same time. Multiple pilot signal measurements are made. At least two channel quality indicator values are generated from measurements corresponding to at least two pilot signals of different power levels. The two values are transmitted back to the base station which uses both values to determine the transmit power requited to achieve a desired SNR at the wireless terminal. The wireless terminal also reports information indicating its location to a sector boundary.

    摘要翻译： 导频信号传输序列和用于多扇区小区的方法。 不同扇区的飞行员以不同的已知功率水平传输。 在相邻扇区中，在相邻扇区中没有发送导频的情况下发送导频。 这表示空导频信号的传输。 还支持单元空白，其中NULL导频在单元的每个扇区中同时被发送。 进行多个导频信号测量。 至少两个信道质量指标值是从对应于不同功率电平的至少两个导频信号的测量产生的。 这两个值被发送回基站，其使用两个值来确定在无线终端处实现期望的SNR所需的发射功率。 无线终端还向扇区边界报告指示其位置的信息。

    Method of transmitting pilot tones in a multi-sector cell, including null pilot tones, for generating channel quality indicators
    4.
    发明授权
    Method of transmitting pilot tones in a multi-sector cell, including null pilot tones, for generating channel quality indicators 有权
    在多扇区小区中发送导频音的方法，包括空导频音，用于产生信道质量指标

    公开(公告)号：US07218948B2

    公开(公告)日：2007-05-15

    申请号：US10648766

    申请日：2003-08-25

    申请人： Rajiv Laroia ,  John L. Fan ,  Junyi Li

    发明人： Rajiv Laroia ,  John L. Fan ,  Junyi Li

    IPC分类号： H04Q7/20

    CPC分类号： H04W52/24 ,  H04B7/0491 ,  H04B17/24 ,  H04B17/309 ,  H04L5/0007 ,  H04L5/0048 ,  H04L25/0226 ,  H04W16/24 ,  H04W52/325

    摘要： Pilot signal transmission sequences and methods for use in a multi-sector cell. Pilots in different sectors are transmitted at different known power levels. In adjacent sectors a pilot is transmitted while no pilot is transmitted in the adjoining sector. This represents transmission of a NULL pilot signal. A cell NULL is also supported in which NULL pilots are transmitted in each sector of a cell at the same time. Multiple pilot signal measurements are made. At least two channel quality indicator values are generated from measurements corresponding to at least two pilot signals of different power levels. The two values are transmitted back to the base station which uses both values to determine the transmit power required to achieve a desired SNR at the wireless terminal. The wireless terminal also reports information indicating its location to a sector boundary.

    摘要翻译： 导频信号传输序列和用于多扇区小区的方法。 不同扇区的飞行员以不同的已知功率水平传输。 在相邻扇区中，在相邻扇区中没有发送导频的情况下发送导频。 这表示空导频信号的传输。 还支持单元空白，其中NULL导频在单元的每个扇区中同时被发送。 进行多个导频信号测量。 至少两个信道质量指标值是从对应于不同功率电平的至少两个导频信号的测量产生的。 这两个值被发送回使用这两个值的基站，以确定在无线终端实现期望的SNR所需的发射功率。 无线终端还向扇区边界报告指示其位置的信息。

    DC control of a multilevel signal
    6.
    发明授权
    DC control of a multilevel signal 有权
    直流控制多电平信号

    公开(公告)号：US06604219B1

    公开(公告)日：2003-08-05

    申请号：US09496897

    申请日：2000-02-02

    申请人： David C. Lee ,  John L. Fan ,  Yung-Cheng Lo

    发明人： David C. Lee ,  John L. Fan ,  Yung-Cheng Lo

    IPC分类号： H03M520

    CPC分类号： H04L25/4919 ,  G11B7/0045 ,  G11B7/013 ,  G11B20/10 ,  G11B20/1496 ,  G11B20/18 ,  G11B2020/1457 ,  H03M13/09

    摘要： A system and method are disclosed for writing a multilevel data sequence to a storage medium so that a read signal generated by reading the multilevel data sequence from the storage medium will have reduced low frequency content is described. The method includes evaluating the effect of a plurality of candidate merge symbols on an RDS of the read signal. A preferred merge symbol is selected from among the plurality of candidate merge symbols based on the effect of the preferred merge symbol on an RDS of the read signal. The preferred merge symbol is added to the multilevel data sequence so that the RDS of the read signal is controlled.

    摘要翻译： 公开了一种用于将多级数据序列写入存储介质的系统和方法，以便通过从存储介质读取多级数据序列而产生的读取信号将具有降低的低频内容。 该方法包括评估多个候选合并符号对读取信号的RDS的影响。 基于优选合并符号对读取信号的RDS的影响，从多个候选合并符号中选择优选合并符号。 优选的合并符号被添加到多级数据序列，使得读取信号的RDS被控制。

    Coding system and method for partial response channels
    7.
    发明授权
    Coding system and method for partial response channels 失效
    部分响应通道的编码系统和方法

    公开(公告)号：US06385255B1

    公开(公告)日：2002-05-07

    申请号：US09369746

    申请日：1999-08-06

    申请人： Steven W. McLaughlin ,  David C. Lee ,  Jonathan A. Zingman ,  John L. Fan

    发明人： Steven W. McLaughlin ,  David C. Lee ,  Jonathan A. Zingman ,  John L. Fan

    IPC分类号： H03M516

    CPC分类号： H04L1/0059 ,  H04L25/497

    摘要： A system and method for reading data to and writing data from multi-level (M-ary) partial response channels uses a trellis coder to encode an input bit stream sequence into a stream of multi-level data symbols. The data symbols are written to the partial response channel using any of a number of techniques. Preferably, the trellis coder anticipates the modulation transfer function of the partial response channel in encoding the data. Because the partial response channel has its own transfer function, the relationship between the data read from the channel and the actual input data bits is a function not only of the data encoder but also of the partial response channel. Therefore, a decoder specification used to implement the decoder takes into account the effect of the trellis encoder as well as the effect of the partial response channel.

    摘要翻译： 用于从多级（M-ary）部分响应信道读取数据并向其写入数据的系统和方法使用网格编码器将输入比特流序列编码成多级数据符号流。 数据符号使用许多技术中的任一种被写入部分响应信道。 优选地，网格编码器在编码数据时预期部分响应信道的调制传递函数。 由于部分响应信道具有其自身的传递函数，所以从信道读取的数据与实际输入数据位之间的关系不仅是数据编码器而且部分响应信道的功能。 因此，用于实现解码器的解码器规范考虑了网格编码器的效果以及部分响应信道的影响。