3 results about "Analog transmission" patented technology

The present disclosure provides approaches for determining retransmission criteria in a wireless communication system, with particular interest in analog transmission systems. The proposed methods and apparatuses improve the efficiency and accuracy of information transmission by using criteria such as signal quality, distortion metric, or cyclic redundancy check to determine whether to request or perform retransmission of an analog decoded signal. Thus, methods are provided that enable wireless communication to be performed at both a first wireless device (transmitter) and a second wireless device (receiver), which involves the transmitter transmitting an analog decoded signal to the receiver, and the receiver determining a retransmission criterion based on the received signal and sending feedback to the transmitter. The feedback can be a non-acknowledgement or acknowledgement determined based on the aforementioned criteria, or the feedback can be the criterion itself. In response to the feedback, the transmitter determines whether to transmit a retransmission of the analog decoded signal.

A one-way data link analog transmission device includes an intermediate frequency (IF) signal unit, a frequency synthesizer unit, a mixer unit, a radio frequency (RF) transmission unit, a local control unit, and a programmable network interface. Each unit is an independent module equipped with an electromagnetic compatibility (EMC) shielded shell, assembled into an integrated device with an aluminum alloy unibody package. The IF signal unit uses an FPGA+DAC architecture to generate IF modulation signals; the frequency synthesizer unit provides a highly stable local oscillator signal and clock reference; the mixer unit performs signal mixing to generate a pre-modulated signal; the RF transmission unit performs multi-stage processing to achieve RF signal up-conversion and high-precision amplitude control, and adopts adaptive power control. This invention features a pure one-way architecture, weighs less than 3 kg, has a deployment time of less than 5 minutes, can accurately reproduce the one-way command transmission characteristics in aviation equipment, has strong anti-interference capabilities, stable transmission, and is suitable for multiple scenarios such as airborne, field, and laboratory applications. Its cost is only 25% of the market standard target source, and it can be matched with various aviation equipment communication protocols, exhibiting excellent practicality and scalability.

The application belongs to the field of optical fiber communication, and discloses a dispersion simulation transmission link and a dispersion simulation method based on analog signal processing. The dispersion simulation transmission link comprises a coherent transmitter, an IQ modulator, lasers with different wavelengths, an interference receiving chip (ICR), a Bragg dispersion compensation grating (FBG-DCM) and a coherent receiver. Data is sent from the coherent transmitter, first passes through the ICR to convert the optical field into the electrical domain, and is modulated into a new optical field by the IQ modulator. The output end of the ICR has two optional paths. The first path is connected to the IQ modulator, uses the secondary emission of intrinsic light with different wavelengths, and converts the wavelength to the FBG-DCM compensation window. After the above steps, the original wavelength is converted by the IQ modulator after being received by the ICR for transmission, so that the superposition of negative dispersion is realized. The second path is connected to the IQ modulator, uses the secondary emission of intrinsic light with different wavelengths, realizes the phase conjugation and converts to the FBG-DCM compensation window at the same time. After the above steps, the ICR receives and realizes the superposition of positive dispersion.