公开(公告)号：WO2004086712A3

公开(公告)日：2004-12-02

申请号：PCT/US2004008665

申请日：2004-03-19

Applicant: QUALCOMM INC ,  WALTON JAY ROD ,  MEDVEDEV IRINA

Inventor： WALTON JAY ROD ,  MEDVEDEV IRINA

IPC: H04J99/00 ,  H04L1/00 ,  H04L1/06 ,  H04L27/26

CPC classification number: H04L1/0016 ,  H04L1/0003 ,  H04L1/0009 ,  H04L1/0021 ,  H04L1/0025 ,  H04L1/0618 ,  H04L27/2602

Abstract: Techniques to select a suitable transmission mode for a data transmission in a multi-channel communication system with multiple transmission channels having varying SNRs. In one method, an SNR estimate is initially obtained for each of multiple transmission channels used to transmit a data stream. An average SNR and an unbiased variance are then computed for the SNR estimates for the multiple transmission channels. A back-off factor is determined, for example, based on the SNR variance and a scaling factor. An operating SNR for the transmission channels is next computed based on the average SNR and the back-off factor. The transmission mode is then selected for the data stream based on the operating SNR. The selected transmission mode is associated with a highest required SNR that is less than or equal to the operating SNR. The method may be used for any system with multiple transmission channels having varying SNRs.

Abstract translation: 用于在具有变化的SNR的多个传输信道的多信道通信系统中为数据传输选择合适的传输模式的技术。 在一种方法中，最初针对用于传输数据流的多个传输信道中的每一个获得SNR估计。 然后为多个传输信道的SNR估计计算平均SNR和无偏差方差。 例如，基于SNR方差和缩放因子来确定退避因子。 然后基于平均SNR和退避因子计算传输信道的工作SNR。 然后基于操作SNR为数据流选择传输模式。 所选传输模式与小于或等于操作SNR的最高所需SNR相关联。 该方法可以用于具有不同SNR的多个传输信道的任何系统。

公开(公告)号：WO03071711A2

公开(公告)日：2003-08-28

申请号：PCT/US0305371

申请日：2003-02-19

Applicant: QUALCOMM INC

Inventor： MEDVEDEV IRINA ,  WALTON JAY R ,  KETCHUM JOHN W

IPC: H04J99/00 ,  H04B7/005 ,  H04B7/04 ,  H04B7/06 ,  H04L1/00 ,  H04L1/06

CPC classification number: H04B7/0417 ,  H04B7/0619 ,  H04L1/0001 ,  H04L1/06 ,  H04W52/42

Abstract: Techniques for controlling the transmit power for a number of data streams in a wireless multi-channel (e.g., MIMO) communication system. In one method, a number of received symbol streams are initially processed in accordance with a particular (e.g., CCMI, CCMI-SC, MMSE, or MMSE-SC) receiver processing technique to provide a number of detected data streams. The post-detection SNRs of the detected data streams are estimated, and each SNR that exceeds a setpoint is identified. This setpoint may correspond to (1) the SNR needed to achieve the maximum allowed spectral efficiency or (2) the target SNR needed to achieve a specified spectral efficiency. A new (or adjusted) transmit power for each detected data stream associated with a post-detection SNR that exceeds the setpoint is determined and used for the data stream. Different power control schemes are provided for different classes of receiver processing techniques with different characteristics.

Abstract translation: 用于在无线多信道（例如，MIMO）通信系统中控制多个数据流的发射功率的技术。 在一种方法中，根据特定（例如CCMI，CCMI-SC，MMSE或MMSE-SC）接收机处理技术来初始化处理多个接收到的符号流，以提供多个检测到的数据流。 估计检测到的数据流的检测后SNR，并且识别超过设定点的每个SNR。 该设定点可以对应于（1）实现最大允许频谱效率所需的SNR或（2）实现特定频谱效率所需的目标SNR。 确定与用于超过设定点的检测后SNR相关联的每个检测到的数据流的新（或调整的）发射功率并将其用于数据流。 为不同类型的具有不同特性的接收机处理技术提供不同的功率控制方案。