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Alternative signal processor arithmetic for modified implementation of a normalised adaptive channel equaliser

: Hahn, H.; Hosticka, B.J.; Timmermann, D.

IEE proceedings. Part F 139 (1992), Nr.1, S.36-42
ISSN: 0143-7070
ISSN: 0956-375X
Fraunhofer IMS ()
Algorithmen; algorithms; arithmetic; Arithmetik; CORDIC; signal processing; Signalverarbeitung

In adaptive digital signal processing, fast multiplication is one of the most important operations and is implemented as an array multiplier in a standard signal processor. For the realisation of more complex algorithms the CORDIC method has also been proposed but rarely used. A signal processor arithmetic based on a CORDIC- and an array multiplier/accumulator unit is proposed in the paper and an efficient implementation of an adaptive equaliser is given as an example. The concept combines the normalised lattice gradient ant the well known LMS algorithm. The advantage of this approach is that the gradient lattice algorithm is less complex than the normalised least-squares lattice algorithm and only slightly slower, yet is still much faster than the gradient transversal LMS algorithm. It is shown that the modified CORDIC algorithm with the proposed arithmetic can reduce the computational complexity.