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    • 4. 发明申请
    • Mixed direct-indirect adaptation procedure applied to receiver filter
    • 混合直接间接适应程序适用于接收机滤波器
    • US20060233289A1
    • 2006-10-19
    • US10558095
    • 2004-05-21
    • Daniel MassicotteAdel-Omar Dahmane
    • Daniel MassicotteAdel-Omar Dahmane
    • H03D1/04
    • H04L25/03038H04B1/7105H04L25/0228H04L25/03331
    • An adaptive procedure that optimizes the parameters of a receiver filter such as a Multiuser Detection (MUD) applied to Direct-Sequence Code Division Multiple Access (DS-CDMA) is disclosed. This procedure takes into account the constraints imposed by the absence of training data sequences sent by the transmitter and required to adapt the filter parameters at the receiver. The adaptation consists in using two distinct data sequences transmitted through the same channel; one data sequence is transmitted as payload data and a second data sequence is transmitted as training data used to adapt the filter parameters at the receiver. Parameters of the receiver filter are adapted in presence of varying channels at the same time as the data information sequences are transmitted. The adaptation is realized following a mixed adaptation procedure based on a direct (without channel identification) and indirect (with channel identification) scheme. The invention is described for UMTS (Universal Mobile Telecommunications System) application in cellular communications system.
    • 公开了一种优化诸如应用于直接序列码分多址(DS-CDMA)的多用户检测(MUD)的接收机滤波器的参数的自适应过程。 该过程考虑了由发射机发送的训练数据序列的不存在而施加的限制,并且需要在接收机处适配滤波器参数。 适应包括使用通过相同信道传输的两个不同的数据序列; 作为有效载荷数据发送一个数据序列,作为训练数据发送第二数据序列,用于在接收机处适配滤波器参数。 在发送数据信息序列的同时,接收机滤波器的参数适应存在变化的信道。 基于直接(无信道识别)和间接(具有信道识别)方案的混合适配过程来实现适配。 针对蜂窝通信系统中的UMTS(通用移动电信系统)应用描述了本发明。
    • 6. 发明申请
    • Method and System For Multi-User Channel Estimation in Ds-Cdma Systems
    • Ds-Cdma系统中多用户信道估计的方法和系统
    • US20080130674A1
    • 2008-06-05
    • US11547895
    • 2005-04-08
    • Messaoud Ahmed-OuameurDaniel Massicotte
    • Messaoud Ahmed-OuameurDaniel Massicotte
    • H04B7/216
    • H04L25/0204H04B1/7103H04B1/7105H04B2201/70701H04L25/0212H04L25/0224
    • The method and system for multi-user channel estimation in a multi-access network comprises: providing a communication signal (ri) providing an estimated communication signal Formula (I) generated using a spreading code signal (Ci), an information sequence signal (Bi) and a predicted composite channel impulse response signal Formula (II); comparing the communication signal (ri) to the estimated communication signal Formula (I) to provide an error signal (εi); and generating an estimated composite channel impulse response signal Formula (III) using the error signal (εi), the spreading code signal (Ci) and the information sequence signal (Bi); the predicted composite channel impulse response signal Formula (II) providing the multi-user channel estimation. The proposed method, which is based on a LMS like algorithm, is an efficient and low complexity method allowing estimating and tracking even fast times varying multi-path channels. Instantaneously, the composite channel impulse response is computed and estimates of all possible path energies are computed to be used as an indicator of the significant paths (delays).
    • 用于多接入网络中的多用户信道估计的方法和系统包括:提供提供使用扩展码信号(C)产生的估计通信信号公式(I)的通信信号(r i i i) 信息序列信号(B< i>)和预测的复合信道脉冲响应信号公式(II); 将通信信号(r i i i i)与估计的通信信号公式(I)进行比较,以提供误差信号(ε-1)。 以及使用所述误差信号(epsilon),所述扩展码信号(C SUB)和所述信息序列信号(C i),生成估计的复合信道脉冲响应信号公式(III) B) 提供多用户信道估计的预测复合信道脉冲响应信号公式(II)。 所提出的基于LMS的算法的方法是一种有效且低复杂度的方法,允许估计和跟踪甚至快速变化的多径信道。 瞬时地,计算复合信道脉冲响应,并计算所有可能的路径能量的估计,以用作有效路径(延迟)的指标。