Abstract: A sender (702) transmits one or more frames to a receiver (704). The receiver (704) either calculates a carrier frequency difference or a time difference using the one or more frames. A clock (722) in the receiver (704) is synchronized with a clock (714) in the sender (702) using the carrier frequency difference or the time difference.

Abstract: A receiver (100) adjusts its overall gain based on the detected power level of an incoming signal. The receiver is built with two detectors (D1, D2) which operate with different detecting ranges within the dynamic range of the incoming signal. If the actual power level of the incoming signal falls within one of the resolving ranges, an automatic gain control adjusts the gain of the receiver to a corresponding gain value. If not, the resolving range of one of the two detectors is shifted and eventually reduced to cover the portion of the dynamic range in which the power level is comprised. The gain of the receiver is then temporarily adjusted and a new measurement is carried out by the detector using the new resolving range. The AGC then re-adjusts the gain of the receiver based on the measurement given by the modified detector.

Abstract: Clear channel assessment (CCA) is a very important issue in Ultra-Wideband (UWB) systems. An effective CCA mechanism will have a large impact on the overall throughput of the communications system. It is disclosed methods and circuits to carry out CCA determinations exploiting the structure of the pulse signal either by using a moving average or by performing a cross-correlation with a locally generated signal.

Abstract: The present invention provides isolated nucleic acid and amino acid sequences of sweet taste receptors comprising two heterologous G-protein coupled receptor polypeptides from the T1R family of sensory G-protein coupled receptors, antibodies to such receptors, methods of detecting such nucleic acids and receptors, and methods of screening for modulators of sweet taste receptors.

Abstract: An incoming signal, such as a data frame, is detected in a RF stage (302) of a wireless station (300). This allows the baseband stage (304) to be in a low power or off state until an incoming signal is detected. By detecting an incoming signal in the RF stage (302), the amount of power consumed by the baseband stage (304) is advantageously reduced. When an incoming signal is detected, the RF stage (302) generates an activation signal that is sent to the baseband stage (304) to activate the baseband stage (304). Once activated, the baseband stage (304) receives the signal and performs signal processing and data recovery operations.

Abstract: A receiver (100) adjusts its overall gain based on the detected power level of an incoming signal. The receiver is built with two detectors (D1, D2) which operate with different detecting ranges within the dynamic range of the incoming signal. If the actual power level of the incoming signal falls within one of the resolving ranges, an automatic gain control adjusts the gain of the receiver to a corresponding gain value. If not, the resolving range of one of the two detectors is shifted and eventually reduced to cover the portion of the dynamic range in which the power level is comprised. The gain of the receiver is then temporarily adjusted and a new measurement is carried out by the detector using the new resolving range. The AGC then re-adjusts the gain of the receiver based on the measurement given by the modified detector.

Abstract: A quadrature transmitter (200) and receiver (100) have configurable I and Q channel paths that facilitate the application of select test signals to determine gain and phase imbalance introduced by each of the transmitter (200) and receiver (100). In a first ‘normal’ configuration, each of the I and Q channels are independently tested by applying an I-only test signal, followed by a Q-only test signal. In a second ‘switched transmitter’ configuration, the Q-only test signal is again applied. In a third ‘switched receiver’ configuration, the I-only test signal is again applied. By combining the results of the application of each of these test signals, gain and phase imbalance of each of the transmitter and the receiver can be determined. In a preferred embodiment, these configurations and test signals are applied within a single transceiver (300) that has the output of its transmitter (200) closed-loop coupled to the input of its receiver (100).

Abstract: The present invention provides isolated nucleic acid and amino acid sequences of sweet taste receptors comprising two heterologous G-protein coupled receptor polypeptides from the T1R family of sensory G-protein coupled receptors, antibodies to such receptors, methods of detecting such nucleic acids and receptors, and methods of screening for modulators of sweet taste receptors.

Abstract: The present invention provides isolated nucleic acid and amino acid sequences of magnesium and manganese-sensing G-protein coupled receptor polypeptides from the C family of G-protein coupled receptors, antibodies to such receptors, methods of detecting such nucleic acids and receptors, and methods of screening for modulators of magnesium and manganese metabolism.

Abstract: A transmitter and/or receiver includes a single crystal clock oscillator circuit and a sample rate converter (SRC) that selectively generates samples at an alternative frequency for subsequent transmission or decoding. A 40 MHz crystal provides the clock signal for the digital-to-analog and analog-to-digital converters that are used to convert the samples to and from analog form. In an IEEE 802.11-compatible embodiment, the 802.11a compatible 20 MHz OFDM samples are converted to and from analog form directly, whereas a sample rate converter converts the 802.11b compatible 22 MHz DSSS samples to and from 40 MHz samples to provide compatibility with the 40 MHz analog conversions.

Abstract: A combination of pre-distortion and post-distortion processes compensate for errors in I/Q channel orthogonality. The pre-distortion and post-distortion processes are calibrated to compensate for these errors at a variety of frequencies across a frequency span, thereby providing frequency-dependent compensation for I/Q channel mismatch. Pre-distortion calibration is effected by coupling the filtered analog I/Q modulated signals from the transmitter of a wireless transceiver directly to the analog-to-digital converters of the receiver of the wireless transceiver. Coupling the analog I/Q modulated signals from the transmitter directly to the channel filters that precede the analog-to-digital converters of the receiver effects post-distortion calibration.

Abstract: The present invention provides isolated nucleic acid and amino acid sequences of sweet or amino acid taste receptors comprising two heterologous G-protein coupled receptor polypeptides from the T1R family of sensory G-protein coupled receptors, antibodies to such receptors, methods of detecting such nucleic acids and receptors, and methods of screening for modulators of sweet and amino acid taste receptors.

Abstract: The present invention provides isolated nucleic acid and amino acid sequences of sweet taste receptors comprising two heterologous G-protein coupled receptor polypeptides from the T1R family of sensory G-protein coupled receptors, antibodies to such receptors, methods of detecting such nucleic acids and receptors, and methods of screening for modulators of sweet taste receptors.

Abstract: The invention includes nucleic acid and amino acid sequences of a taste cell-specific ion channel subunit that is specifically expressed in taste cells, antibodies to such subunits, methods of detecting such nucleic acids and proteins, and methods of screening for modulators of taste cell specific ion channel subunits.