A novel nonlinear adaptive filter using a pipelined second-order Volterra recurrent neural network

Authors:
Haiquan Zhao;Jiashu Zhang
Affiliations:
Si-Chuan Province, Key Lab of Signal and Information Processing, Southwest Jiaotong University, Chengdu, 610031, China;Si-Chuan Province, Key Lab of Signal and Information Processing, Southwest Jiaotong University, Chengdu, 610031, China
Venue:
Neural Networks
Year:
2009

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Abstract

To enhance the performance and overcome the heavy computational complexity of recurrent neural networks (RNN), a novel nonlinear adaptive filter based on a pipelined second-order Volterra recurrent neural network (PSOVRNN) is proposed in this paper. A modified real-time recurrent learning (RTRL) algorithm of the proposed filter is derived in much more detail. The PSOVRNN comprises of a number of simple small-scale second-order Volterra recurrent neural network (SOVRNN) modules. In contrast to the standard RNN, these modules of a PSOVRNN can be performed simultaneously in a pipelined parallelism fashion, which can lead to a significant improvement in its total computational efficiency. Moreover, since each module of the PSOVRNN is a SOVRNN in which nonlinearity is introduced by the recursive second-order Volterra (RSOV) expansion, its performance can be further improved. Computer simulations have demonstrated that the PSOVRNN performs better than the pipelined recurrent neural network (PRNN) and RNN for nonlinear colored signals prediction and nonlinear channel equalization. However, the superiority of the PSOVRNN over the PRNN is at the cost of increasing computational complexity due to the introduced nonlinear expansion of each module.