Abstract: A wireless transceiver system for compensating a transport loss includes a transceiver (100), a tower mounted amplifier (TMA) (200), and a transport loss detector (400). The transceiver transmits a first signal at a transmit power. The first signal is changed into a second signal after cable attenuation from the transceiver. The TMA is connected to the transceiver via a cable, receives a second signal, and amplifies the second signal. The transport loss detector is connected to the TMA, and calculates a transport loss between the transceiver and the TMA. The TMA further compensates the transport loss between the transceiver and the TMA according to the calculated result of the controller.

Abstract: A wireless transceiver system, for compensating a transport loss, includes an antenna (300), a transceiver (100), a tower mounted amplifier (TMA) (200), and a transport loss detector (400). The transceiver transmits a first signal at a transmit power. The first signal is changed into a second signal after the cable attenuation from the transceiver. The TMA, connected to the transceiver via a cable, receives the second signal and amplifies the second signal. The transport loss detector, connected between the TMA and the transceiver, detects a transmission state of the transceiver, and calculates a transport loss between the transceiver and the TMA. The TMA transmits signals to the antenna or receives signals from the antenna according to the detected result of the transport loss detector, and compensates the transport loss according to the calculated result of the transport loss detector.

Abstract: An exemplary intermediate frequency (IF) signal loss compensation circuit for an outdoor unit of a communication system includes a sending circuit, a detection circuit, a receiving circuit, and a control circuit. The detection circuit detects in substantially real-time the loss of signal transmitted via a cable from the indoor to the outdoor unit, and transmits loss signal to the control circuit. The control circuit compares the loss signal with a pre-stored signal to determine the loss and then, the control circuit gives loss signals of the sending circuit a variable gain compensation according to the loss. The control circuit also gives loss signals of the receiving circuit a variable gain compensation in advance. The IF signal loss compensation circuit can detect the IF signal loss in substantially real-time, giving the IF signal a variable gain compensation for the loss.

Abstract: A radio frequency (RF) signal communication system provided with amplifier predistortion comprises an antenna for wireless communication. Through the antenna and a receiving path of the system, RF signals are received and transmitted to a baseband module. The transmission path of the system comprises a predistorter and an amplifier, in which the predistorter performs predistortion to compensate signal distortion under the amplification by the amplifier. A coupler is utilized to sample a portion of RF signals output by the amplifier as the feedbacks for the predistortion.

Abstract: A system for correcting a DC offset includes a digital-to-analog (D/A) converter module (30), a summing circuit (40), an inphase-to-quadrature (I/Q) modulator (50), a spectrum analyzer module (60) and a DC offset correction module (70). The D/A converter module converts digital control signals to analog control signals, and outputs DC offset regulating signals. The summing circuit respectively sums up the DC offset regulating signals and corresponding vectors of a base band signal. The I/Q modulator receives the summed base band signal, and converts the summed base band signal to a radio frequency (RF) signal. The spectrum analyzer module analyzes an energy variation according to a DC offset contained in the RF signal. The DC offset correction module outputs the digital control signals to adjust the DC offset regulating signals, thereby obtaining the lowest energy variation.

Abstract: A circuit for canceling a direct current (DC) offset in a communication system includes a digital-to-analog (D/A) converter assembly (30), a summing circuit (40), an inphase-to-quadrature (I/Q) modulator (50), a detecting module (70), and a microcontroller (80). The D/A converter assembly converts digital DC offset regulation signals to analog DC offset regulation signals. The summing circuit sums up the DC offset regulation signals and corresponding vectors of a received base band signal. The I/Q modulator converts the summed base band signal to a radio frequency (RF) signal. The detecting module detects an energy variation due to DC offset contained in the radio frequency (RF) signal. The microcontroller regulates the DC offset regulation signals output from the D/A converter assembly to minimize the energy variation detected by the detecting module. In the invention, the circuit saves energy and enhances qualities of communication signals.

Abstract: A system for correcting a DC offset includes a digital-to-analog (D/A) converter module (30), a summing circuit (40), an inphase-to-quadrature (I/Q) modulator (50), a spectrum analyzer module (60) and a DC offset correction module (70). The D/A converter module converts digital control signals to analog control signals, and outputs DC offset regulating signals. The summing circuit respectively sums up the DC offset regulating signals and corresponding vectors of a base band signal. The I/Q modulator receives the summed base band signal, and converts the summed base band signal to a radio frequency (RF) signal. The spectrum analyzer module analyzes an energy variation according to a DC offset contained in the RF signal. The DC offset correction module outputs the digital control signals to adjust the DC offset regulating signals, thereby obtaining the lowest energy variation.

Abstract: A wireless transceiver system, for compensating a transport loss, includes an antenna (300), a transceiver (100), a tower mounted amplifier (TMA) (200), and a transport loss detector (400). The transceiver transmits a first signal at a transmit power. The first signal is changed into a second signal after the cable attenuation from the transceiver. The TMA, connected to the transceiver via a cable, receives the second signal and amplifies the second signal. The transport loss detector, connected between the TMA and the transceiver, detects a transmission state of the transceiver, and calculates a transport loss between the transceiver and the TMA. The TMA transmits signals to the antenna or receives signals from the antenna according to the detected result of the transport loss detector, and compensates the transport loss according to the calculated result of the transport loss detector.

Abstract: A wireless transceiver system for compensating a transport loss includes a transceiver (100), a tower mounted amplifier (TMA) (200), and a transport loss detector (400). The transceiver transmits a first signal at a transmit power. The first signal is changed into a second signal after cable attenuation from the transceiver. The TMA is connected to the transceiver via a cable, receives a second signal, and amplifies the second signal. The transport loss detector is connected to the TMA, and calculates a transport loss between the transceiver and the TMA. The TMA further compensates the transport loss between the transceiver and the TMA according to the calculated result of the controller.

Abstract: An aerial vehicle speed correlation method for two-dimensional visual reproduction of laser radar images of the present invention is capable of altering and controlling the output timing of the invention's laser radar system rated output lines based on the moving distance and the speed of an aerial vehicle. The speed error correlation method of the present invention is not limited to outputting one output line for every scanned line (N) for reducing the accumulation of geometric distortion error along the in-track direction of the scan frame. The speed correlation method of the present invention uses a set of generated fire table of equation to correct tangential error along the cross-track direction and to improve the reproduction quality of the laser radar images.

Abstract: An aerial vehicle speed correlation method for two-dimensional visual reproduction of laser radar images of the present invention is capable of altering and controlling the output timing of the system's rated output lines based on the moving distance and the speed of [[the]] an aerial vehicle. The speed error correlation method of the present invention is not limited to outputting one output line for every scanned line (N) to reduce the accumulation of geometric distortion error along the in-track direction of the scan frame. The speed correlation method of the present invention uses a set of generated fire table of equations to correct tangential error along the cross-track direction and to improve the reproduction quality of the laser radar images.

Abstract: Half-plane predictive cancellation method for laser radar distance image noise employed in the present invention can perform real-time adjustment while conducting simultaneous pixel generation and noise cancellation during the scanning process. The same method can also be used in performing line-by-line operation after completion of each line scan. The latter half-plane of the line-by-line scanning operation can shift from left-to-right or right-to-left or reverse scanning direction after the completion of each line scan to decrease the possibilities of error accumulation.