Patent
Communication system for eliminating time delay effects when used in a multipath transmission medium
Bello Phillip A,Salwen Howard C +1 more
TLDR
In this paper, a communication system for providing effective multipath transmission without intermodulation or other distortion effects normally arising from the transmission through a dispersive medium, such as multipath troposcatter communication links, is described.Abstract:
A communication system for providing effective multipath transmission without intermodulation or other distortion effects normally arising from the transmission through a dispersive medium, such as multipath troposcatter communication links. In the invention the analog information is used to phase or amplitude modulate a transmitter signal and digital information is used to frequency and phase modulate such signal in a hybrid modulation process which is readily adapted to permit alternate analog and digital modulation, simultaneous analog and digital modulation, or sole analog or sole digital modulation over periodically occurring frame intervals of time. At the receiver the multipath signal is appropriately gated to select only those portions of the received signal which are the least affected by time delays introduced by the multipath transmission, such selected portions being demodulated to reconstruct the analog and digital information which has been transmitted.read more
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Patent
Wireless local area network (WLAN) technology and applications including techniques of universal frequency translation
David F. Sorrells,Michael J. Bultman,Robert W. Cook,Richard C. Looke,Charley D. Moses,Gregory S. Rawlins,Michael W. Rawlins +6 more
TL;DR: Frequency translation and applications of same are described in this paper, including wireless local area network (WLAN) applications such as IEEE Standard 802.11 WLANs, such as, but are not limited to, frequency down-conversion, frequency up-concversion, enhanced signal reception, unified downconversion and filtering, and combinations of same.
Patent
Method and system for down-converting an electromagnetic signal
David F. Sorrells,Michael J. Bultman,Robert W. Cook,Richard C. Looke,Charley D. Moses,Gregory S. Rawlins,Michael W. Rawlins +6 more
TL;DR: In this paper, the authors proposed a method for down converting a modulated carrier signal to a demodulated baseband signal, which requires that at least some of the energy stored in the first storage device is discharged when the first switch is off.
Patent
Method and system for down-converting and up-converting an electromagnetic signal, and transforms for same
David F. Sorrells,Michael J. Bultman,Robert W. Cook,Richard C. Looke,Charley D. Moses,Gregory S. Rawlins,Michael W. Rawlins +6 more
TL;DR: In this paper, the authors described a system for down-converting and up-concussing an EM signal by recursively operating on approximate half cycles (½, 1½, 2½, etc.) of the carrier signal.
Patent
Method and system for ensuring reception of a communications signal
TL;DR: In this article, a modulating baseband signal with desired information is accepted, and a plurality of redundant spectrums is generated, each redundant spectrum comprises the necessary amplitude, phase, and frequency information to substantially reconstruct the modulating BS signal.
Patent
Method and apparatus for reducing DC offsets in a communication system
TL;DR: In this paper, a feedback loop circuit reduces DC offset in a wireless local area network (WLAN) receiver channel and a circuit provides gain control in a WLAN receiver channel.
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