Pulse or digital communications – Spread spectrum
Reexamination Certificate
2005-08-09
2005-08-09
Le, Amanda T. (Department: 2634)
Pulse or digital communications
Spread spectrum
C375S261000, C375S298000
Reexamination Certificate
active
06928101
ABSTRACT:
Binary and Quadrature Feher's Modulation (F-Modulation, or FMOD) Transmitter-Receiver systems and circuits exhibit reduced envelope fluctuation and peak radiation, and increased efficiency. A subclass of these systems has a constant envelope. They advantageously provide lower power operation with improved performance including robust BER performance, and compatibility with both linearly and nonlinearly amplified narrow spectrum, and without disadvantages of conventional BPSK, DBPSK QPSK and pi/4-QPSK. Feher's BPSK (FBPSK) is an improved efficiency transmitter which is compatible with conventional BPSK receivers. FBPSK modems are based on using quadrature structure where Q-channel data is inserted in quadrature with I-channel data for certain applications. The Q-channel data may be “offset” from the I-channel data by an amount selectable between zero and a specified time. Further improvement in the spectrum is attained using correlation between I and Q channels. FBPSK modem is shown to meet the IEEE 802.11 specified spectral direct sequence spread spectrum mask (−30 dB point) for wireless LAN, and leads to an output power gain of 6.5 dB over conventional BPSK modems. The cross-coupled quadrature FMOD structure is also suitable for continuous mode and for burst operated TDMA, FDMA, CDMA, WCDMA and CSMA Frequency Modulation Quadrature AM (QAM), QPSK and offset QPSK, as well as pi/4-shifted QPSK modems/processors. Reduced modulation index Gaussian FSK (GFSK), multilevel FM and cross-coupled Quadrature Amplitude Modulated (QAM) transmitters and combinations of these modulations and corresponding coherent demodulators are disclosed. Controlled rise and fall time descriptions of burst operated systems are included.
REFERENCES:
patent: 3944926 (1976-03-01), Feher
patent: 4339724 (1982-07-01), Feher
patent: 4567602 (1986-01-01), Kato et al.
patent: 4644565 (1987-02-01), Seo et al.
patent: 4680777 (1987-07-01), Saha et al.
patent: 4849990 (1989-07-01), Ikegami et al.
patent: 5544167 (1996-08-01), Lucas et al.
Blakely , Sokoloff, Taylor & Zafman LLP
Intel Corporation
Le Amanda T.
LandOfFree
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