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Low Complexity Adaptive Blind Equalization Using the Frequency Domain Block Constant Modulus Algorithm
Yoon Gi YANG Sang Uk LEE
IEICE TRANSACTIONS on Communications
Publication Date: 1999/10/25
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Radio Communication
adaptive equalization, blind equalization, frequency domain adaptive filter,
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In this paper, fast algorithms for the CMA (constant modulus algorithm), which is one of the widely used algorithms for blind equalizationi are presented. We propose the FBCMA (frequency domain block CMA) which takes advantage of fast linear convolution in the DFT domain by using the overlap save method. For the FBCMA, a nonlinear error function in the frequency domain is derived using Parseval's relation. Also, an adaptive algorithm in the DFT domain is introduced to adjust the frequency domain filter coefficients. For a block size and filter length of N, the multiplications required for the conventional CMA and proposed FBCMA are on the order of O(N2) and O(N log N), respectively.