Modulators – Phase shift keying modulator or quadrature amplitude modulator
Patent
1995-01-09
1996-02-13
Mis, David
Modulators
Phase shift keying modulator or quadrature amplitude modulator
332100, 375302, 375305, 375308, H03C 300, H04L 2712, H04L 2720
Patent
active
054914574
ABSTRACT:
Binary and Quadrature Feher's (F)-Modulation/Amplification with significantly reduced envelope fluctuations and peak radiation, increased power efficiency and transmit power delivered by connected RF (radio frequency), Infrared (IR) and other devices. A subclass of these systems has a constant envelope. Extraordinary power advantages, robust BER performance and linearly or nonlinearly amplified narrow spectrum without the pitfalls of conventional BPSK and DBPSK is attained. The FBPSK improved efficiency transmitter 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. The Q channel data is the same as the I channel but is offset by one half bit (Tb/2). 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 mask (-30 dB point) for wireless LAN, and leads output power gain of 6.5 dB over BPSK modems. The Crosscoupled Quadrature Structure is also suitable for digital and for analog frequency modulation (Feher's Frequency Modulation). Reduced modulation index Gaussian FSK (GFSK), multilevel FM and crosscoupled Quadrature Amplitude Modulated (QAM) transmitters and combinations of these modulations and corresponding coherent demodulators are described.
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Brown, "Building up smart wireless blocks," Electronic Engineering Times, Apr. 1994, pp. 20, 21, 36.
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Just et al., "FQPSK-Siemens Components for Exirlan Infrared (IR), Wireless IEEE 802.11 Radio, Other European, American, and International Standards," IEEE 802.11 Wireless Access Method and Physical Layer Specifications, Doc. IEEE P802.11-94, Mar. 1994, pp. 1-5.
Kato et al., "Performance of OQPSK and Equivalent FQPSK-KF for the DS-SS Sysem," IEEE 802.11 Wireless Access Method and Physical Layer 3Specifications, Doc. IEEE P802.11-93/189, Nov. 1993, pp. 1-6.
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Caserza Steven F.
Mis David
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