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    • 5. 发明授权
    • Mitigation of interference and crosstalk in communications systems
    • 减轻通信系统中的干扰和串扰
    • US07978591B2
    • 2011-07-12
    • US11694981
    • 2007-03-31
    • Mark Alan EricksonThorkell GudmundssonIoannis KanellakopoulosJohn Josef Hench
    • Mark Alan EricksonThorkell GudmundssonIoannis KanellakopoulosJohn Josef Hench
    • H04J1/12H04J3/10
    • H04L25/03006H04L25/0246H04L2025/03426
    • Signals in a multi-channel, impaired communication system are post-processed at the receiver. A triangular matrix Decision Feedback Demodulator (DFD) at the receiver extracts channels without requiring delivery of receiver parameters to the transmitter. Multi-Input Multi-Output (MIMO) processing matrices and DFD parameters are computed by first applying matrix transformations to diagonalize the noise covariance matrix of the multiple channels received at the receiver. QR decompositions (i.e., decompositions into orthogonal and triangular matrices) are then applied to the main channels to obtain triangular channel matrices. The noise-diagonalizing transformations and QR decompositions are then combined to form the MIMO postprocessing matrices and DFD parameters. MIMO postprocessing matrices and DFD parameters are computed from training data and then adapted during live data transmission.
    • 多通道,受损的通信系统中的信号在接收机上进行后处理。 在接收器处的三角矩阵判决反馈解调器(DFD)提取信道而不需要向发射机传送接收机参数。 通过首先应用矩阵变换来对接收机接收的多个信道的噪声协方差矩阵进行对角化来计算多输入多输出(MIMO)处理矩阵和DFD参数。 然后将QR分解(即,分解成正交和三角矩阵)施加到主信道以获得三角形信道矩阵。 然后将噪声对角化变换和QR分解组合以形成MIMO后处理矩阵和DFD参数。 从训练数据计算MIMO后处理矩阵和DFD参数,然后在实时数据传输期间进行调整。
    • 6. 发明申请
    • Approximations for simulations of systems
    • 系统仿真近似
    • US20080140379A1
    • 2008-06-12
    • US11809040
    • 2007-05-30
    • Sunil C. ShahThorkell GudmundssonKeith NaborsSharad Nandgaonkar
    • Sunil C. ShahThorkell GudmundssonKeith NaborsSharad Nandgaonkar
    • G06F17/50
    • G06F17/5036
    • Approximations for previewer-based decomposition are disclosed. In one embodiment, the previewer uses only resistors, capacitors, and controlled sources. Thus, at least some circuit elements that are not resistors or capacitors may be replaced with some combination of resistors, capacitors, or controlled sources. For example, inductors can be modeled as short circuits or as a non-zero resistance. As another example, transistors can be replaced by some combination of resistors, capacitors, and controlled sources. In one embodiment, a diagonal approximation is used to form an approximation for simulation in a previewer-based decomposition. The diagonal approximation uses resistors, capacitors, or controlled sources, in one embodiment. In one embodiment, an impedance between two partitions is split to form a new previewer node.
    • 公开了基于预览器的分解的近似。 在一个实施例中,预览器仅使用电阻器,电容器和受控源。 因此,至少一些不是电阻器或电容器的电路元件可以用电阻器,电容器或受控源的某些组合代替。 例如,电感器可以被建模为短路或非零电阻。 作为另一示例,晶体管可以由电阻器,电容器和受控源的某些组合代替。 在一个实施例中,使用对角线近似来形成用于基于预览器的分解中的模拟的近似。 在一个实施例中,对角线近似使用电阻器,电容器或受控源。 在一个实施例中,两个分区之间的阻抗被分割以形成新的预览器节点。