Title :
On the implementation of adaptive equalizers for wireless ATM with an extended QR-decomposition-based RLS-algorithm
Author :
Drewes, Christian ; Hasholzner, Ralph ; Hammerschmidt, Joachim S.
Author_Institution :
Inst. for Integrated Circuits, Tech. Univ. of Munchen, Germany
Abstract :
An extended quadratic residue (QR)-decomposition (QRD)-based RLS-algorithm is introduced, applicable for equalization, allowing an estimate of the transmitted symbol, when it is a-priori unknown. To achieve low-cost implementations strength reduction and square-root free Givens-rotations are applied. Several QRD-based RLS-algorithms are compared in terms of the number of mathematical operations. The QR-RLS-algorithm indicates lowest complexity and is always a good candidate, when a huge training overhead has to be avoided, resulting in an equalizer of less than 15 taps. Finally, the hardware complexity of a 13 MBaud-DFE for wireless ATM is estimated
Keywords :
adaptive equalisers; asynchronous transfer mode; computational complexity; decision feedback equalisers; least squares approximations; radio networks; recursive estimation; subscriber loops; 26 Mbit/s; DFE; QR-RLS-algorithm; QRD-based RLS-algorithm; adaptive equalizers; complexity; equalization; extended QR-decomposition-based RLS-algorithm; implementation; square-root free Givens-rotations; strength reduction; transmitted symbol; wireless ATM; Adaptive equalizers; Asynchronous transfer mode; Costs; Decision feedback equalizers; Hardware; Optical feedback; Optical fiber cables; Optical fiber networks; Optical filters; Throughput;
Conference_Titel :
Acoustics, Speech and Signal Processing, 1998. Proceedings of the 1998 IEEE International Conference on
Conference_Location :
Seattle, WA
Print_ISBN :
0-7803-4428-6
DOI :
10.1109/ICASSP.1998.679606
