Pulse or digital communications – Equalizers – Automatic
Reexamination Certificate
2002-02-19
2008-10-14
Ghayour, Mohammad (Department: 2611)
Pulse or digital communications
Equalizers
Automatic
C375S348000, C375S353000
Reexamination Certificate
active
07436881
ABSTRACT:
An Apparatus for non-linear per-bin adaptive equalization in orthogonal multi-carrier data transmission systems with the Nyquist sub-channel spectral shaping and T/2 staggering of in-phase and quadrature components is disclosed. A previously introduced linear equalization embodiments are augmented by up to three, or more decision feed-back filters, to improve performance in presence of narrow-band interference (NBI) in wire-line and wire-less data transmission systems, and to enable exploitation of implicit diversity of multi-path fading channels, both with and without transmitter-end pre-coding. Adaptation properties of per-bin DFE equalization are analyzed by computer simulation for an intermediate number of constituent sub-channels. BER performance comparison between the conventional Orthogonal Frequency Division Multiplication-(OFDM) and (Orthogonal Quadrature Amplitude Modulation (OQAM)-based multi-carrier systems of similar modulation/demodulation complexity and transmission latency is provided and the potential advantage of using spectrally well shaped orthogonal sub-channels in wireless applications is demonstrated.
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Nedic Slobodan
Popovic Nenad
Ghayour Mohammad
NEC Corporation
Panwalkar Vineeta S
Sughrue & Mion, PLLC
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