Demodulating encoded data

Pulse or digital communications – Receivers – Particular pulse demodulator or detector

Reexamination Certificate

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Reexamination Certificate

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06999533

ABSTRACT:
The invention provides the ability to exploit redundancy characteristics of an equation set used to generate waveforms for wireless communication. In doing so, the invention can reduce the number of correlation values that need to be calculated in order to determine the most likely transmitted code word. In particular, the invention can exploit the redundancy characteristics of the equation set in a novel and unique fashion by separating the vector and calculating partial correlations for each separated portion of the vector. The techniques can drastically reduce the number of correlation values that need to be computed for demodulation, and can also reduce the total number of computations. In this manner, the demodulator of a wireless communication device can be simplified without negatively impacting performance.

REFERENCES:
patent: 5579338 (1996-11-01), Kojima
patent: 6515980 (2003-02-01), Bottomley
patent: 6819707 (2004-11-01), Abraham et al.
Webster, et al., “Additional Covercode and Fast Transform Detail”, Sep. 1998, IEEE 802.11-98/331, pps 1-20.
Tae-Ho Kim, et al.,A New Architecture of CCK Modem Based on Iterative Differential-Modulation and Phase-Detection; ICECS 0221 8thIEEE International Conference on Electronics.
VanNee, et al.,OFDM Codes for Peak-to-Average Power Reduction and Error Correction; IEEE Globecom 1996.
Halford, et al.,Complementary Code Keying for Rake-Based Indoor Wireless Communication; ISCAS 1999 IEEE.

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