Multiplex communications – Generalized orthogonal or special mathematical techniques – Quadrature carriers
Patent
1997-04-01
1999-12-21
Pham, Chi H.
Multiplex communications
Generalized orthogonal or special mathematical techniques
Quadrature carriers
375279, H04L 2710
Patent
active
060058404
ABSTRACT:
The combined complementary encoder and modulation system for an OFDM transmitter system combines complementary coding and modulation and exploits the similarity of their mathematical structure to reduce implementation complexity. In doing so, the improved OFDM transmitter system uses complementary codes to reduce the power-to-average power (PAP) ratio of the transmitted signal. Additionally, the combined complementary encoder and modulation system can be modified to provide scaleablity, which allows a transmitter to operate in various transmission environments. More precisely, scaleability refers to the transmitter's capability to adapt the bit rate of the data, so as to satisfy varying signal bandwidth, delay spreads, tolerance and signal-to-noise ratio requirements.
REFERENCES:
patent: 5636247 (1997-06-01), Kamerman et al.
patent: 5694389 (1997-12-01), Seki et al.
patent: 5732068 (1998-03-01), Takahashi et al.
patent: 5841813 (1998-11-01), Van Nee
"Complementary Series", by Marcel J. E. Golay IRE Transactions On Information Theory. pp. 82-87.
Awater Geert Arnout
van Nee Richard D. J.
Lucent Technologies - Inc.
Nguyen Kim T.
Pham Chi H.
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