Uni Wien OFDM Patents

Patent Selling Contact
(CEO) Yorck Hernandez

Making OFDM possible at high Doppler Shift.

  • US8824602
  • US8755429
  • US8824534
  • EP2615784
  • EP2363986
  • EP2363985

A Suite of Algorithms for OFDM equalization

Three OFDM algorithms are on offer for integration in the signal processing section of the receiver for wireless applications; 

  • “OFDM Estimation” - Wireless Channel Estimation
  • “OFDM Equalization” - Equalization with BEM
  • “Multi-Taper OFDM Equalization” - Equalization using multiple filters

Applications

  • OFDM wireless backhaul
  • WAVE (IEEE 802.11p)
  • WiMax (IEEE 802.16 a/e/m)
  • DVB-T (ETSI EN 300 744)
  • 3GPP LTE (UTRAN LTE for “4G”)

Advantages

  • Mitigates Doppler shift
  • Compensates CFO
  • Synchronized with reception
  • Uses standard pilot arrangement
  • FFT based
  • Applicable in low SNRs
  • Energy efficient
  • Low BER
  • Can be used with any symbol constellation (4QAM, 16QAM, 64QAM)
  • Can be combined with any error correcting codes and any decision feedback mechanism

Algorithms Offered

“OFDM Estimation”; Fourier coefficients of the wireless channel taps are estimated. This
algorithm is also synchronised with the reception of the OFDM symbol. In the framework of
the basis expansion model (BEM), the BEM coefficients can be computed using a few
additional flops.
“OFDM Equalization”; Utilizing FFT, the channel matrix can be applied to any vector using
only BEM coefficients without creating the channel matrix. Standard iterative solvers are
used in an FFT based algorithm for equalization.
“Multi-Taper OFDM Equalization”; This algorithm is designed for utilizing more than one
filter at the receiver end, the filters are applied after the FFT block at the receiver end at a
very low computation overhead. Thanks to the special structure, the resulting equation is
solved with linear complexity. Increasing the number of filters from one to two remarkably
improves the BER.