A low-complexity PAR-reduction method for DMT-VDSL

Godkänd; 1999; 20080506 (ysko)
DMT-VDSL signals have a high peak-to-average power ratio (PAR). In the transmitters, the PAR governs the necessary resolution of the digital-to-analog converter (DAC) and is an important factor for the power consumption of the line-driver. Aiming at implementation in a specific system, we propose a low complexity PAR-reduction method based on the iterative algorithm derived in [5, 20, 24, 25]. We maintain good performance while stressing a straigthforward and low-complex implementation. Key elements of the method are: low latency; no loss in data rate; precalculated and stored peak-cancellation waveform; and bit-shifts (multiplication with powers of two) replacing the scaling of the waveform. Computer simulations show that, for a DMT frame length of 4096 samples and a frame clip rate of 10-4, the PAR can be reduced about 1.5 to 2.0 dB, depending on the number of peaks cancelled. When multiplication is replaced by bit-shifts, the reduction is still 1.5-1.7 dB.

Feichtinger, Hans GNUHAG (Numerical Harmonic Analysis Group), Dept. of Mathematics, University of Vienna (författare)
Grip, Niklas (författare)
Isaksson, MikaelTelia Research AB (författare)
Kaiblinger, NorbertNUHAG (Numerical Harmonic Analysis Group), Dept. of Mathematics, University of Vienna (författare)
Ödling, Per (författare)
Persson, Lars-ErikLuleå tekniska universitet,Matematiska vetenskaper(Swepub:ltu)larserik (författare)
NUHAG (Numerical Harmonic Analysis Group), Dept. of Mathematics, University of ViennaTelia Research AB (creator_code:org_t)

Ingår i:Proceedings of the 5th International Symposium on Digital Signal Processing for Communication Systems, s. 164-169

Av författaren/redakt...: Börjesson, Per O ...; Feichtinger, Han ...; Grip, Niklas; Isaksson, Mikael; Kaiblinger, Norb ...; Ödling, Per; visa fler...; Persson, Lars-Er ...; visa färre...

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