Properties of a general quaternion-valued gradient operator and its applications to signal processing
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  • 作者:Meng-di Jiang ; Yi Li ; Wei Liu
  • 关键词:Quaternion ; Gradient operator ; Signal processing ; Least mean square (LMS) algorithm ; Nonlinear adaptive filtering ; Adaptive beamforming ; TN911.7 ; O29
  • 刊名:Frontiers of Information Technology & Electronic Engineering
  • 出版年:2016
  • 出版时间:February 2016
  • 年:2016
  • 卷:17
  • 期:2
  • 页码:83-95
  • 全文大小:464 KB
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  • 作者单位:Meng-di Jiang (1)
    Yi Li (2)
    Wei Liu (1)

    1. Department of Electronic and Electrical Engineering, University of Sheffield, Sheffield, S1 3JD, UK
    2. School of Mathematics and Statistics, University of Sheffield, Sheffield, S3 7RH, UK
  • 刊物类别:Computer Science, general; Electrical Engineering; Computer Hardware; Computer Systems Organization
  • 刊物主题:Computer Science, general; Electrical Engineering; Computer Hardware; Computer Systems Organization and Communication Networks; Electronics and Microelectronics, Instrumentation; Communications Engine
  • 出版者:Zhejiang University Press
  • ISSN:2095-9230
文摘
The gradients of a quaternion-valued function are often required for quaternionic signal processing algorithms. The HR gradient operator provides a viable framework and has found a number of applications. However, the applications so far have been limited to mainly real-valued quaternion functions and linear quaternionvalued functions. To generalize the operator to nonlinear quaternion functions, we define a restricted version of the HR operator, which comes in two versions, the left and the right ones. We then present a detailed analysis of the properties of the operators, including several different product rules and chain rules. Using the new rules, we derive explicit expressions for the derivatives of a class of regular nonlinear quaternion-valued functions, and prove that the restricted HR gradients are consistent with the gradients in the real domain. As an application, the derivation of the least mean square algorithm and a nonlinear adaptive algorithm is provided. Simulation results based on vector sensor arrays are presented as an example to demonstrate the effectiveness of the quaternion-valued signal model and the derived signal processing algorithm. Keywords Quaternion Gradient operator Signal processing Least mean square (LMS) algorithm Nonlinear adaptive filtering Adaptive beamforming

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