Abstract
A multi-stage blind clustering algorithm is proposed for equalisation of multi-level quadrature amplitute modulation (M-QAM) channels. A hierarchical decomposition divides the task of equalising a high-order QAM channel into much simpler sub-tasks. Each sub-task can be accomplished fast and reliably using a blind clustering algorithm derived originally for 4-QAM signals. The constant modulus algorithm (CMA) is used as a benchmark to assess this multi-stage blind equaliser. It is demonstrated that the new blind algorithm achieves much faster convergence and is very robust when input symbols are not sufficiently white. This multi-stage clustering equaliser only requires slightly more computations than the CMA and, like the latter, its computational complexity does not increase as the levels of digital symbols increase.
Original language | English |
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Pages (from-to) | 701-705 |
Number of pages | 5 |
Journal | IEEE Transactions on Communications |
Volume | 43 |
Issue number | 2-4 |
DOIs | |
Publication status | Published - 1995 |