Outer loop power control for wireless communications
    51.
    发明授权
    Outer loop power control for wireless communications 有权
    用于无线通信的外环功率控制

    公开(公告)号:US07860526B2

    公开(公告)日:2010-12-28

    申请号:US12493986

    申请日:2009-06-29

    IPC分类号: H04B7/00 H04Q11/12

    摘要: An integrated circuit configured for outer loop power control uses data transmitted in temporary dedicated channel allocations. A target metric, preferably, target SIR, is adjusted with differing step up and step down increments to converge on a relatively low steady state level of step up and step down target metric adjustments. The initial target SIR and the transient step size for target SIR adjustment is determined in a dynamic way in the outer loop power control for each Temp-DCH allocation of non-real time data.

    摘要翻译: 配置用于外环功率控制的集成电路使用在临时专用信道分配中发送的数据。 目标度量,优选目标SIR,以不同的升压和降压增量进行调整,以收敛于相对低的稳态水平的升压和降压目标度量调节。 在非实时数据的每个Temp-DCH分配的外环功率控制中,以动态方式确定目标SIR调整的初始目标SIR和瞬态步长。

    Method and apparatus for deriving a combined transmit power control command during handover
    52.
    发明授权
    Method and apparatus for deriving a combined transmit power control command during handover 失效
    用于在切换期间导出组合的发射功率控制命令的方法和装置

    公开(公告)号:US07657278B2

    公开(公告)日:2010-02-02

    申请号:US11234629

    申请日:2005-09-23

    IPC分类号: H04W52/24 H04W52/40

    CPC分类号: H04W52/40 H04W52/146

    摘要: A method and apparatus for deriving a combined transmit power control (TPC) command during handover are disclosed. During handover, a combined TPC command is generated from two or more TPC commands. The combined TPC command is set to −1 for decrease of the transmit power if a soft symbol of the TPC signal from any cell indicates decrease of the transmit power and the signal-to-interference ratio for the cell is greater than a reliability threshold. Otherwise, the combined TPC command is set to −1 if the function γ is not greater than the combining threshold, and set to +1 if the function γ is greater than the combining threshold, where the function γ represents a log-likelihood ratio of a probability density function of the combined TPC command.

    摘要翻译: 公开了一种用于在切换期间导出组合发射功率控制(TPC)命令的方法和装置。 在切换期间,从两个或多个TPC命令生成组合的TPC命令。 如果来自任何小区的TPC信号的软符号表示发射功率的降低,并且小区的信号干扰比大于可靠性阈值,则组合的TPC命令被设置为-1以降低发射功率。 否则,如果函数gamma不大于组合阈值,则将组合的TPC命令设置为-1,如果函数gamma大于组合阈值,则将其设置为+1,其中函数gamma表示对数似然比 组合TPC命令的概率密度函数。

    OUTER LOOP POWER CONTROL FOR WIRELESS COMMUNICATIONS
    53.
    发明申请
    OUTER LOOP POWER CONTROL FOR WIRELESS COMMUNICATIONS 有权
    无线通信的外环功率控制

    公开(公告)号:US20090264146A1

    公开(公告)日:2009-10-22

    申请号:US12493986

    申请日:2009-06-29

    IPC分类号: H04B7/005

    摘要: An integrated circuit configured for outer loop power control uses data transmitted in temporary dedicated channel allocations. A target metric, preferably, target SIR, is adjusted with differing step up and step down increments to converge on a relatively low steady state level of step up and step down target metric adjustments. The initial target SIR and the transient step size for target SIR adjustment is determined in a dynamic way in the outer loop power control for each Temp-DCH allocation of non-real time data.

    摘要翻译: 配置用于外环功率控制的集成电路使用在临时专用信道分配中发送的数据。 目标度量,优选目标SIR,以不同的升压和降压增量进行调整,以收敛于相对低的稳态水平的升压和降压目标度量调节。 在非实时数据的每个Temp-DCH分配的外环功率控制中以动态方式确定目标SIR调整的初始目标SIR和瞬态步长。

    Method and system for optimization of channel estimation and synchronization in an OFDM-MIMO wireless communication system
    54.
    发明授权
    Method and system for optimization of channel estimation and synchronization in an OFDM-MIMO wireless communication system 失效
    OFDM-MIMO无线通信系统中信道估计和同步优化的方法和系统

    公开(公告)号:US07406130B2

    公开(公告)日:2008-07-29

    申请号:US11524225

    申请日:2006-09-20

    IPC分类号: H04B7/02 H04L1/02

    摘要: The present invention is related to a method and system for optimization of channel estimation and synchronization in an Orthogonal Frequency Division Multiplexing (OFDM) Multiple-Input Multiple-Output (MIMO) wireless communication system. In accordance with the present invention, all of the training sequences are simply constructed based on a basic code by cyclically shifting the basic code. The training sequences are transmitted from different antennas in parallel without performing inverse fast Fourier transform. As a result, there is no peak-to-average ratio problem. Channel estimation is performed in each receiver based on the samples before fast Fourier transform and the maximum-likelihood estimate of channel response in time domain is then mapped into the frequency domain. The channel estimation is not only very simple in implementation, but also very efficient in computation.

    摘要翻译: 本发明涉及一种用于在正交频分复用(OFDM)多输入多输出(MIMO)无线通信系统中优化信道估计和同步的方法和系统。 根据本发明,通过循环移位基本代码,基于基本代码简单地构建所有的训练序列。 训练序列并行地从不同的天线发射,而不进行快速傅立叶逆变换。 因此,没有峰均比例问题。 基于快速傅立叶变换之前的样本在每个接收机中执行信道估计,然后将时域中的信道响应的最大似然估计值映射到频域。 信道估计不仅在实现上非常简单,而且在计算上也非常有效。

    MIMO TRANSMITTER AND RECEIVER FOR SUPPORTING DOWNLINK COMMUNICATION OF SINGLE CHANNEL CODEWORDS
    55.
    发明申请
    MIMO TRANSMITTER AND RECEIVER FOR SUPPORTING DOWNLINK COMMUNICATION OF SINGLE CHANNEL CODEWORDS 有权
    用于支持单通道编码器的下行链路通信的MIMO发射机和接收机

    公开(公告)号:US20080144733A1

    公开(公告)日:2008-06-19

    申请号:US11842252

    申请日:2007-08-21

    IPC分类号: H04B7/02 H04L27/28

    摘要: The downlink (DL) communication of single channel codewords is supported by providing a multiple-input multiple-output (MIMO) transmitter and receiver. The transmitter includes NT transmit antennas for transmitting spatial streams to a receiver having NR receive antennas, a precoder and a space-time or space-frequency matrix construction unit in communication with the precoder and the transmit antennas. The space-time or space-frequency matrix construction unit constructs a matrix that defines a threaded algebraic space-time (TAST) codeword based on a number of virtual antennas, NV, and the number of transmit antennas, NT. The transmitter operates in an open loop mode when no feedback information from the receiver is available, a semi-open loop mode when channel rank information is available, and a closed loop mode when channel state information (CSI) is available. The receiver is configured to provide feedback to the transmitter on a per received spatial stream basis

    摘要翻译: 通过提供多输入多输出(MIMO)发射机和接收机来支持单信道码字的下行链路(DL)通信。 发射机包括用于将空间流发送到具有N个N个接收天线的接收机的N T个发射天线,通信中的预编码器和时空或空时矩阵构造单元 与预编码器和发射天线。 空时或空频矩阵构造单元构造一个矩阵,该矩阵基于多个虚拟天线N N V N定义线性代数空时(TAST)码字,并且发射天线的数量 ,N T T。 当没有来自接收机的反馈信息可用时,发射机以开环模式工作,当信道秩信息可用时为半开环模式,当信道状态信息(CSI)可用时为闭环模式)。 接收器被配置为在每个接收到的空间流的基础上向发射机提供反馈

    Quality control scheme for Multiple-Input Multiple-Output (MIMO) Orthogonal Frequency Division Multiplexing (OFDM) systems
    58.
    发明申请
    Quality control scheme for Multiple-Input Multiple-Output (MIMO) Orthogonal Frequency Division Multiplexing (OFDM) systems 有权
    多输入多输出(MIMO)正交频分复用(OFDM)系统的质量控制方案

    公开(公告)号:US20060023745A1

    公开(公告)日:2006-02-02

    申请号:US11118867

    申请日:2005-04-29

    摘要: A method and apparatus for optimizing the system capacity of an Orthogonal Frequency Division Multiplexing (OFDM) system that uses with Multiple-Input Multiple-Output (MIMO) antennas. In a receiver, a target quality of service (QoS) metric and reference data rate are set. The target QoS metric may be set to a predetermined value and/or may be adjusted dynamically with respect to packet error rate (PER) by a slow outer-loop control processor. The QoS of received signals are measured and compared to the target QoS. Depending on the comparison, the receiver generates a channel quality indicator (CQI) which is sent back to the transmitting transmitter. The CQI is a one or two bit indicator which indicates to the transmitter to disable, adjust or maintain data transmission rates of particular sub-carriers, groups of sub-carriers per transmit antenna, or groups of sub-carriers across all transmit antennas. At the transmitter, the transmitted data rate is disabled, adjusted or maintained. At the receiver, the target QoS metric and reference data rate are adjusted accordingly. This process is repeated for each data frame of each sub-carrier group.

    摘要翻译: 一种用于优化与多输入多输出(MIMO)天线一起使用的正交频分复用(OFDM)系统的系统容量的方法和装置。 在接收机中,设置目标服务质量(QoS)度量和参考数据速率。 可以将目标QoS度量设置为预定值和/或可以通过慢速外部环路控制处理器相对于分组错误率(PER)动态地调整。 测量接收信号的QoS并将其与目标QoS进行比较。 根据比较,接收机产生信道质量指示符(CQI),其被发送回发送发射机。 CQI是一个或两个比特指示符,其向发射机指示禁用,调整或维持特定子载波,每个发射天线的子载波组或跨所有发射天线的子载波组的数据传输速率。 在发射机处,传输的数据速率被禁用,调整或维护。 在接收机处,相应地调整目标QoS度量和参考数据速率。 对于每个子载波组的每个数据帧重复该处理。

    Quality control scheme for multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems
    59.
    发明授权
    Quality control scheme for multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems 有权
    用于多输入多输出(MIMO)正交频分复用(OFDM)系统的质量控制方案

    公开(公告)号:US08705389B2

    公开(公告)日:2014-04-22

    申请号:US12983491

    申请日:2011-01-03

    IPC分类号: H04J1/16 H04L1/00

    摘要: A method and apparatus for optimizing the system capacity of an Orthogonal Frequency Division Multiplexing (OFDM) system that uses with Multiple-Input Multiple-Output (MIMO) antennas. In a receiver, a target quality of service (QoS) metric and reference data rate are set. The target QoS metric may be set to a predetermined value and/or may be adjusted dynamically with respect to packet error rate (PER) by a slow outer-loop control processor. The QoS of received signals are compared to the target QoS. Depending on the comparison, the receiver generates a channel quality indicator (CQI) which is sent to the transmitter. The CQI is a one or two bit indicator which indicates to the transmitter to disable, adjust or maintain data transmission rates of particular sub-carriers, groups of sub-carriers per transmit antenna, or groups of sub-carriers across all transmit antennas. At the transmitter, the transmitted data rate is disabled, adjusted or maintained.

    摘要翻译: 一种用于优化与多输入多输出(MIMO)天线一起使用的正交频分复用(OFDM)系统的系统容量的方法和装置。 在接收机中,设置目标服务质量(QoS)度量和参考数据速率。 可以将目标QoS度量设置为预定值和/或可以通过慢速外部环路控制处理器相对于分组错误率(PER)动态地调整。 将接收到的信号的QoS与目标QoS进行比较。 根据比较,接收机产生发送到发射机的信道质量指示符(CQI)。 CQI是一个或两个比特指示符,其向发射机指示禁用,调整或维持特定子载波,每个发射天线的子载波组或跨所有发射天线的子载波组的数据传输速率。 在发射机处,传输的数据速率被禁用,调整或维护。