摘要:
A bidirectional wireless communication system includes: a first wireless communication apparatus for bidirectional communication configured to multiplex a modulated signal obtained by modulating an input signal by a reference carrier signal having a predetermined carrier frequency, and transmit a resultant transmission signal; and a second wireless communication apparatus, having an oscillator configured to oscillate a signal having a free-running oscillation frequency, configured to inject a reception signal received from the first wireless communication apparatus into the oscillator, receive the reception signal while variably controlling the free-running oscillation frequency of the oscillator of the second wireless communication apparatus, detect whether the free-running oscillation frequency of the signal of the oscillator of the second wireless communication apparatus has entered the frequency range up to the injection locking to be frequency-locked with a carrier frequency of the injected reception signal, and generate a communication enable signal.
摘要:
A communication system including a first station having at least two first narrow beam antennas and a second station having at least two second narrow beam antennas. The first and second stations establish a first communication path for wireless communication via a pair of first and second narrow beam antennas. When communication via the first communication path is disturbed by obstacles, the first and second stations automatically establish at least one alternative communication path, which is spatially different from the first communication path, for wireless communication using the at least two first narrow beam antennas and the at least two second narrow beam antennas.
摘要:
A method providing wireless communication between a first station and a second station. The method establishes at least one communication path between at least one pair of antennas including a first antenna of the first station and a second antenna of the second station, wherein at least one of the first and second antennas is a narrow beam antenna, selects at least one part of the bandwidth available on the communication path, and transmits data between the pair of antennas over the selected part of the bandwidth.
摘要:
A method for establishing a wireless communication link between a first communication device having a beam antenna to be steered to different positions and a second communication device. The method includes transmitting a link request signal from the first communication device to the second communication device via the beam antenna. The link request signal includes information relating to a current position of the beam antenna. The method further includes obtaining, in case the link request signal is received in the second communication device, channel quality information representative of a current transmission path.
摘要:
The present invention relates to a method for transmitting signals in a wireless communication system, in which signals are transmitted from a first communication device to a second communication device, said signals being transmitted in consecutive frames, each frame having a preamble section comprising preamble information, at least one of said first and said second communication devices having a narrow beam antenna which is adapted to be steered to different positions, each of said different positions corresponding to one of a number of different transmission paths from said first to said second communication device, comprising the steps of transmitting and receiving a first preamble section comprising preamble information enabling the estimation of a channel quality of a current transmission path, while said narrow beam antenna is in a current position corresponding to said current transmission path, steering said narrow beam antenna from said current position to a different position corresponding to a candidate transmission path, and transmitting and receiving a second preamble section comprising preamble information enabling the estimation of a channel quality of said candidate transmission path while said narrow beam antenna is in said different position. The present invention further relates to a corresponding transmission device as well as a receiving device.
摘要:
Wireless communication systems are provided with an adaptive subcarrier loading function for a mobile receiver in a wireless communication system based on Orthogonal Frequency Division Multiplexing (OFDM) that can advantageously be applied to predict the channel transfer function of a multipath propagation channel being severely impaired by frequency-selective fading and an extremely time-variant behavior by detecting the position and/or movement of zero points of the transfer function, thereby reducing the probability of incorrect assignment of the modulation scheme for each subcarrier caused by mobile terminals moving at high velocity. The zero points of the estimated channel transfer function are determined by detecting the position of deep notches on the associated amplitude response of the measured channel transfer function caused by frequency-selective fading whose depths are larger than a predefined threshold.
摘要:
A demodulating apparatus that can reduce power consumption significantly compare to conventional cellular phones without the reception quality being degraded. Delay profile measuring is provided in which the delay profile (S41) of the baseband signal is measured while changing the measuring time for measuring the delay profile of the baseband signal, so that the measuring time can be held down to a minimum while avoiding the degradation of the reception power level. Therefore, power consumption can be significantly reduced compared to conventional cellular phones without reception quality being degraded.
摘要:
A ceramic heating element has been conventionally driven by direct-current voltage, but the direct-current voltage causes a problem in the heating element. Therefore, in a method of the present invention, an alternating current is supplied to the heating element by changing a direct current, so that deformation of the heating element can be prevented and reliability can be improved.
摘要:
A driving assist apparatus for an own vehicle is disclosed. The driving assist apparatus acquires light color change information and traffic light location information from at least one of the own vehicle and a different vehicle. The light color change information is information indicative of a change in light color of a traffic light. The traffic light location information is information indicative of location of the traffic light. The driving assist apparatus prediction device predicts a traffic light color change time, based on the light color change information and the traffic light location information. The driving assist apparatus assists a driver in driving the own vehicle in accordance with the light color change time.
摘要:
A communication system including a first station having at least two first narrow beam antennas and a second station having at least two second narrow beam antennas. The first and second stations establish a first communication path for wireless communication via a pair of first and second narrow beam antennas. When communication via the first communication path is disturbed by obstacles, the first and second stations automatically establish at least one alternative communication path, which is spatially different from the first communication path, for wireless communication using the at least two first narrow beam antennas and the at least two second narrow beam antennas.