10 results about "Digital radio" patented technology

A method of determining a time of arrival of a packet at a digital radio device is provided. The packet comprises a header portion and a payload portion. The method comprises the digital radio device receiving a radio signal and processing said radio signal to produce an incoming bit sequence, correlating a first section of the incoming bit sequence with a first correlation sequence corresponding to a first section of the packet to determine a first correlation result, correlating a second section of the incoming bit sequence with a second correlation sequence corresponding to a second section of the packet to determine a second correlation result, said second section including at least part of the payload portion, identifying correlation peaks in the first and second correlation results, and determining a time of arrival of the packet at the digital radio device based on said correlation peaks.

An integrated digital RF circuit system includes: a substrate, the substrate including a substrate integrated waveguide, the substrate integrated waveguide including a waveguide width, a first plurality of vias and a second plurality of vias; and a source circuit board including a waveguide channel, wherein: the waveguide channel is at least partially positioned between the first plurality of vias and the second plurality of vias; the waveguide channel defines a channel length and a channel width; the channel length is greater than the channel width; and the channel length is greater than the waveguide width.

The utility model provides a kind of railway shunting handheld device, it is related to railway shunting technical field, including external structure and internal structure, external structure includes host computer and antenna, host computer includes: screen and button;Internal structure includes: communication module and positioning module;Communication module is used to receive shunting signaling and transmit shunting group personnel and vehicle position to shunting center, including: DMR digital radio unit and 4G / 5G full-network unit, DMR digital radio unit uses 400MHz frequency band communication, 4G / 5G full-network unit uses 4G / 5G full-network communication;Positioning module uses single Beidou RTK high-precision positioning technology to position shunting group personnel and vehicle position.The utility model improves the problem of function fragmentation in prior art, improves the efficiency and safety of shunting operation.

Digital radio transmitters and data transmission methods are provided. Chirp-based spread spectrum digital radio transmitters are configured to suppress or attenuate discontinuities in the chirp frequency profile by an interpolation or smoothing procedure. The interpolation significantly reduces out-of-band emissions and does not affect demodulation and decoding. In the case of LoRa communications, the transmitter of the invention has low constellation error and can communicate with conventional unmodified receivers. The procedure does not introduce unwanted phase shifts and can be used to control the phase of the signal, also inserting arbitrary phase shifts on consecutive segments of the chirp.

A method of operating a digital radio transmitter device in accordance with a predetermined communication protocol defining a transmission timing tolerance. The method comprises: transmitting a plurality of first periodic transmissions in accordance with said predetermined communication protocol having a first period and an inherent timing uncertainty less than said transmission timing tolerance; performing a plurality of second periodic actions with a second period wherein said first and second periods are equal to each other or an integer multiple of each other; and adjusting a timing of one or more of the first periodic transmissions by an amount greater than said inherent timing uncertainty but less than or equal to a difference between said inherent timing uncertainty and said transmission timing tolerance so as to change said first period temporarily by an amount less than or equal to said transmission timing tolerance, thereby changing an offset between said first transmissions and said second actions.

A digital radio communication system for an aircraft includes a cellular base station transceiver and a data processing system for location within an aircraft. The base station transmits data to, and receives data from, mobile cellular devices located within the aircraft. The base station receives, by radio from a mobile device located within the aircraft, an identifier associated with an embedded Subscriber Identity Module (eSIM) installed on the mobile device. The system determines whether the received identifier matches an identifier of a stored set of identifiers authorised for the aircraft, each being associated with a respective eSIM associated with the aircraft. When an identifier match exists, the system transmits a radio signal indicative of a successful eSIM authentication to the mobile device. When an identifier match does not exist, the system transmits a radio signal indicative of an unsuccessful eSIM authentication to the mobile device.

A chirp-based spread spectrum digital radio transmitter configured to suppress or attenuate discontinuities in the chirp frequency profile with an interpolation or smoothing procedure. The interpolation reduces significantly out-of-band emissions and does not affect the demodulation and decoding. In the case of a LoRa communication, the inventive transmitter has low constellation error and can communicate with legacy unmodified receivers. The process does not introduce unwanted phase shifts and can be used to control the signal's phase, also on continuous segments of the chirp to insert an arbitrary phase shift.

The application discloses a kind of multi-channel digital radio frequency board, belong to digital signal processing technical field, including digital board module and radio frequency board module, digital board module includes FPGA1 controller, FPGA2 controller, external device and interface, data exchange connection is carried out between FPGA1 controller and FPGA2 controller by SERDES and is all connected with external device and interface, two pieces AD9361 integrated transceivers that FPGA2 controller is connected in radio frequency board module by FMC_HPC interface by three channel signal control.This application provides multi-channel digital radio frequency board, can realize multi-channel synchronous reception, transmission and processing, improve the performance and reliability of communication system.

A digital radio frequency (RF) transmitter and a wireless communication device including the same can be provided. The digital RF transmitter includes a processing circuit configured to generate a first pattern signal, a second pattern signal, and a third pattern signal based on a pattern of in-phase (I)-quadrature (Q) binary data pairs and a pattern of inverted I-Q binary data pairs, the first pattern signal to the third pattern signal having a same pattern and different phases; and a switched capacitor digital-to-analog converter (SC-DAC) configured to remove an n-th harmonic component in an RF analog signal by amplifying the first pattern signal to the third pattern signal to have a specific size ratio and synthesizing the amplified first pattern signal to the amplified third pattern signal into the RF analog signal, where "n" is an integer of at least 3.

The purpose of this invention is to provide a digital walkie-talkie anti-jamming communication system based on reinforcement learning channel selection, belonging to the field of wireless communication technology. The system includes: a radio frequency (RF) front-end module; a field-programmable gate array (FPGA) connected to a low-speed analog-to-digital converter (ADC); an embedded processor connected to the FPGA; an RF synthesizer connected to the embedded processor, used to switch to the center frequency of the corresponding candidate channel according to the working channel number; and a non-volatile memory connected to the embedded processor, used to store a 32-bit pseudo-random seed pre-shared between the transmitting and receiving ends. This invention combines wideband spectrum sensing capability, accurate identification of active tracking interference, and adaptive anti-jamming communication capability in adversarial environments under low sampling rate and low power consumption conditions.