Did You Know...
...that to encourage use of his new invention, the shopping cart, market owner Sylvan Goldman hired fake shoppers to push the carts around his store in Oklahoma City? Seems his customers were reluctant to give up their hand-carried baskets.
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| Number | Title | Issue Date |
| 6574286 | Modulation system having on-line IQ calibration A modulation system having in-phase and quadrature phase (IQ) calibration while on-line. The modulation system includes an on-line correction data state detector, an IQ correction code, and a scalar amplitude detector. The on-line correction state detecto... | 06/03/2003 |
| 6560296 | Method and apparatus for modulating digital data The modulator includes an oscillator generating signals, each having a different phase, and a selector receiving digital data. When the digital data received by the selector changes logic state, the selector supplies a first and second plurality of signal... | 05/06/2003 |
| 6560297 | Image rejection downconverter for a translation loop modulator A rejection converter is disclosed for use in a transmitter for operating in at least either of a first mode for transmitting signals within a first frequency range, and a second mode for transmitting signals within a second frequency range. The rejection... | 05/06/2003 |
| 6522637 | System and method for allocating a carrier wave frequency of one channel between two carrier wave frequencies of another channel A transmission apparatus and method for a frequency division multiple access (FDMA) system that uses FSK (frequency shift keying) or OOK (On/Of keying) modulation. The apparatus includes a plurality of FSK (or OOK) modulators, each of which allocates a ma... | 02/18/2003 |
| 6522700 | Method and system for the OFDM multicarrier transmission of digital broadcasting signals An improved DAB transmission system with which a higher net data rate can be achieved while maintaining the same system quality, or the same system quality can be achieved with a much lower signal-to-noise ratio on the receiver side at the same net data r... | 02/18/2003 |
| 6512799 | Digital communication system and method for increased bit rates A digital communication system and method is provided for increasing bit-rates while maintaining the reliability of transmitted digital information and avoiding increased power demands. The communication system includes a transmitter that modulates one or... | 01/28/2003 |
| 6498937 | Asymmetric bandwidth wireless communication techniques A wireless communication system operates a power amplifier (422) in an earth terminal (400) in a non-saturated mode of operation to transmit communication signals over a communication uplink to a communication satellite (100). The satellite operates a pow... | 12/24/2002 |
| 6498818 | Method and system for transmitting information by means of phase modulation A method and system for transmitting digital data by means of phase modulation is characterized in that the data are coded at the transmitting end with a code after the fashion of the Differential Manchester Code and are then phase-modulated, and in that ... | 12/24/2002 |
| 6496079 | Optical to microwave converter using direct modulation phase shift keying A point-to-point microwave radio link that operates in a Frequency Division Duplex (FDD) mode using direct digital modulation with a Continuous Phase Shift Keyed (PSK) scheme. The transmit signal is generated by a circuit that uses a Voltage-Control Oscil... | 12/17/2002 |
| 6496536 | System and method for estimating power A system and method for estimating the power of a signal. The signal is compared to and separated into a plurality of ranges. Each range is assigned a particular output value. The output values approximate the square of the input signal based on known cha... | 12/17/2002 |
| 6496542 | Digital communication system Disclosed is a digital communication system for mobile communication, which has: a transmitter for mixing and outputting outputs from two independent and equivalently synchronized transmitting circuits in a π/4 shift QPSK modulation system; and a receive... | 12/17/2002 |
| 6477153 | Method and apparatus for using the sidelobe of a long range antenna for a short range communication link A communication satellite system (100) is established using one or more satellite constellations (110, 120). The two or more satellite groups (110, 120) are connected via long range crosslinks (145) which provide a communication path between the long rang... | 11/05/2002 |
| 6473469 | Local communication system and apparatus for use therein A local area network is based on a ring of twisted pair cable links (UTP), each carrying at least 1.4 Mbps gross data rate. Each station on the network includes an encoder and a following station includes a decoder for PSK (phase shift keying) modulated s... | 10/29/2002 |
| 6473506 | Signaling using phase rotation techniques in a digital communications system In a telecommunications system, such as a cellular radio telecommunications system, transmission information, such as modulation scheme selection information, coding information or power level control commands, is efficiently conveyed from the transmitter... | 10/29/2002 |
| 6470055 | Spectrally efficient FQPSK, FGMSK, and FQAM for enhanced performance CDMA, TDMA, GSM, OFDN, and other systems Spectral efficient transmitters-receivers (transceivers), modulation-demodulation (Modem) methods, architectures, structures and implementation technologies for enhanced performance and increased capacity CDMA, TDMA, GSM,OFDM, CMA, FDM and other wireless ... | 10/22/2002 |
| 6470053 | Methods and arrangements for transmitting data over twisted pair wire using RF modulation techniques Methods and arrangements are provided for allowing various devices to communicate data over standard twisted pair wire within a confined region, such as a home environment. The methods and arrangements employ radio frequency (RF) communication techniques ... | 10/22/2002 |
| 6466150 | Polar analog-to-digital converter A polar analog-to-digital converter ADC that can be advantageously used to extract phase and/or frequency information from a pair of input signals. The polar ADC includes first and second scaling elements, a number of comparators, and a decoder. The first... | 10/15/2002 |
| 6463073 | Slot structure and method of power control for use in a TDMA network The invention is a novel slot structure and method of transmitting data at a controllable power level. The slot comprises a header, a DATA field adjacent the header and a ramp interval adjacent the DATA field. The method consists of transmitting the entir... | 10/08/2002 |
| 6459742 | Digital modulation process and modulator implementing the process The successive symbols of a digital stream are converted into phase increments which are accumulated. A modulating phase is obtained by filtering the accumulated phase. A complex signal is produced whose argument represents the modulating phase. Two quadr... | 10/01/2002 |
| 6449317 | Digital synthesizer The present invention is a method and system for processing communication signals in a wireless telecommunication system having at least two subscriber units. The subscriber units communicate with each other through a selected band of radio frequencies ov... | 09/10/2002 |
| 6445749 | FMOD transceivers including continuous and burst operated TDMA, FDMA, spread spectrum CDMA, WCDMA, and CSMA Binary and Quadrature Feher's (F)-Modulation/Transmitter-Receiver (Transceiver) with reduced envelope fluctuations and peak radiation, increased efficiency delivered by baseband, intermediate frequency (IF) connected RF (radio frequency), Infrared (IR) an... | 09/03/2002 |
| 6445745 | Phase encoding methods for handling multiple phase modulated signals on a single channel A method for phase encoding DPSK and N-PSK which maintains phase continuity and which does not require any reference symbols when using N-PSK. A sequence of known DPSK phases are encoded with respect to an initial phase. The N-PSK phases are then all offs... | 09/03/2002 |
| 6442129 | Enhanced channel estimation A scheme for identifying usable carriers for a particular modulation type and selecting, if possible, a modulation type for modulation of OFDM symbol block associated with data packets in a standard transmission mode based on data channel conditions. Chan... | 08/27/2002 |
| 6434135 | Adaptive RF amplifier prelimiter The invention reduces transient peaks in signals transmitted in CDMA communication systems. A plurality of spread spectrum data signals are combined into a combined signal having fluctuating power level corresponding to the combination of the data signals... | 08/13/2002 |
| 6430228 | Digital QAM modulator using post filtering carrier recombination The efficient quadrature amplitude modulator of the present invention allows from 6 to 8 independent compressed channels to occupy a 6 MHz bandwidth while reducing processing power by 33 percent for 8 levels of modulation offered by 64-QAM and by 25 perce... | 08/06/2002 |
| 6424682 | BPSK encoder circuit A BPSK encoder is provided with a first circuit which processes a carrier signal and a binary signal to be encoded, and produces an output binary signal having synchronous phase shifts representing a change in the value of the signal to be encoded. Also, ... | 07/23/2002 |
| 6421398 | Modulation system having on-line IQ calibration A modulation system having in-phase and quadrature phase (IQ) calibration while on-line. The modulation system includes digital filters for converting I and Q data bit streams into filtered multilevel I and Q digital data streams, digital-to-analog conver... | 07/16/2002 |
| 6421396 | Variable rate modulator Clock signals and digital data signals at a variable frequency are introduced to the input of a FIFO and are passed from the FIFO at a second (or intermediate) frequency controlled by a numerically controlled oscillator. To regulate the frequency of the s... | 07/16/2002 |
| 6421397 | Modulation system having on-line IQ calibration A modulation system having in-phase and quadrature phase (IQ) calibration while on-line. The modulation system includes digital filters for converting I and Q data bit streams into filtered multilevel I and Q digital data streams, digital-to-analog conver... | 07/16/2002 |
| 6400776 | Method and apparatus for high speed data transmission by spectral decomposition of the signaling space A method and apparatus of high speed multi-dimensional signaling, via a modem, has a processing method of utilizing prolate pulses to optimize transmission capacity of the transmission channel. The modem includes a process that segments the channel bandwi... | 06/04/2002 |
| 6396869 | Modulation apparatus and method using zero-crossing detection A spread spectrum apparatus for a code division multiple access communication system maintains orthogonality between transmission signals. In the spread spectrum apparatus, a spreader combines first and second input signals with corresponding pseudo noise... | 05/28/2002 |
| 6396880 | π/4 DQPSK encoder and modulator A π/4 DQPSK modulator includes a rotated and offset π/4 encoder that provides encoded I, Q constellation indices values using positive integers. The positive integer I and Q values are input to a digital filter that provides filtered I, Q constellation ... | 05/28/2002 |
| 6389080 | Random phase shift keying Communication architectures and methods that implement random phase shift keying. A transmitter and a receiver are coupled by way of a communications channel. The transmitter uses a data source and a mapper that produces an amplitude phase keyed (APK) wav... | 05/14/2002 |
| 6389081 | Signal transmission equipment The signal transmission equipment is comprised such that a signal point does not cross the origin of the constellation by selecting signals to be input to the QPSK modulator, and the positions of the signal points in the constellation.... | 05/14/2002 |
| 6385233 | Unbalanced quadrature waveform A method 1100 and apparatus 1200 utilizing unbalanced modulation for providing users in a communication system with different amounts of effective communication energy according to their individual communication environments. A user's communication energy... | 05/07/2002 |
| 6385256 | Method and arrangement for signal modulation The invention relates to a method and arrangement for modulating a signal to be transmitted, the arrangement comprising an encoder and a frequency modulator. In order to enable high rate transmission in a flexible manner in a narrow frequency band, the en... | 05/07/2002 |
| 6373903 | Apparatus and method for increasing the effective data rate in communication systems utilizing phase modulation A system is disclosed for providing communication across a wireless network. The system includes a transmitter transmitting a modulated signal across a radio channel, wherein the transmitter includes first input means for receiving a primary data signal t... | 04/16/2002 |
| 6373901 | Method and apparatus for conditioning modulated signals using window expansion A modulated signal, having a varying magnitude signal envelope, is conditioned, such as to facilitate amplification (500). Minimum values are determined values for portions of the signal envelope (520, 530), and a window expansion function applied to scal... | 04/16/2002 |
| 6369666 | Modulator circuit configuration The circuit for combined operation of a mobile radio with GMSK and 8-PSK modulation includes a transmission PLL for GMSK operation, and a direct modulator for 8-PSK operation. A transmission oscillator in the transmission PLL is also used as a synthesizer... | 04/09/2002 |
| 6366620 | VSAT system A VSAT system for generating and transmitting a modulated data signal to a satellite. The VSAT system includes an indoor unit for generating a modulated data signal having an envelope of constant amplitude, and an outdoor unit including a transmitter modu... | 04/02/2002 |
