52results about How to "Sync frequency" patented technology

The invention relates to a wireless signal transmit-receive apparatus, comprising an antenna, a low noise amplifier, a mixer, a frequency generator, an amplitude limit amplifier, a modulator and a photoelectric converter. The antenna is used for receiving a pulse signal. The low noise amplifier is used for conducting low noise amplification on the pulse signal received by the antenna, and generating processing pulse signal and sending to the mixer. The frequency generator is used for generating a frequency signal and sending it to the mixer. The mixer processes the frequency signal into communication electric signal based on the processing pulse signal. The amplitude limit amplifier is used for conducting amplitude limit amplification on the communication electric signal, and generating amplification electric signal. The modulator is used for conducting protocol transition on the amplification electric signal and generating electric signal. The photoelectric converter is used for converting the electric signal to the optical signal, and sending the optical signal to an optical receiver. The invention is advantageous in that millimeter wave communication technology and optical communication technology are combined, and the special-purpose communication protocol is adopted to achieve vehicle-earth large-capacity and high-reliability data communication of trains under condition of high-speed movement.

The invention discloses a noise-resistance framing modulation method for mobile multi-media broadcast signals of a single frequency network, which is a time domain, frequency domain and space domain hybrid framing modulation scheme. The method has the advantages of low peak-to-average power ratio, short synchronous time, robustness, controllability in multiple services and the like.

The embodiments of the present invention relate to a wireless communication system, comprising a wireless communication array and a wireless signal transceiving chain. The wireless communication array comprises a first array optical fibre, an optical divider and a plurality of wireless communication nodes, wherein the first array optical fibre transmits a first signal optical signal; the optical divider performs division processing on the first signal optical signal to obtain a divided optical signal; and the wireless communication nodes simultaneously and synchronously send first pulse signals. The wireless signal transceiving chain comprises a synchronous controller, a first signal optical fibre, a plurality of first passive optical splitters, a plurality of wireless signal transceiving nodes, a plurality of second passive optical splitters and a second signal optical fibre, wherein the synchronous controller generates a receiving control instruction and sends same to a current wireless signal transceiving node; and the current wireless signal transceiving node generates a first communication optical signal according to a first pulse signal.

The embodiment of the invention relates to a wireless communication method. The method includes the following steps: a first array of optical fibers transmit a first signal optical signal; an opticalsplitter splits the first signal optical signal to obtain multiple paths of identical first branching optical signals; multiple wireless communication nodes synchronously generate the same first pulsesignal, and thus each wireless communication node in a wireless communication array simultaneously and synchronously sends the first pulse signals; a synchronization controller generates a receivingcontrol instruction, and sends the receiving control instruction to a current wireless signal transceiver node through a first signal optical fiber and a first passive optical branching device; the current wireless signal transceiver node receives the first pulse signals simultaneously sent by the multiple wireless communication nodes in the wireless communication array to generate a first communication optical signal; and a second passive optical branching device receives the first communication optical signal sent by the corresponding wireless signal transceiver node and sends the first communication optical signal to a second signal optical fiber.