6 results about "Baseband receiver" patented technology

A receiver path circuit includes a first stage, a down-sampler and a second stage. The first stage is configured to filter a mixer-output-signal received from a mixer and provide a first-stage-output-signal. The down-sampler is configured to down-sample the first-stage-output-signal to provide a transition-signal having a transition-frequency. The transition-frequency is lower than the frequency of the first-stage-output-signal. The second stage includes a switched-capacitor circuit that is configured to filter and reduce the frequency of the transition-signal in order to provide a second-stage-output-signal to an ADC.

The invention discloses a sampling timing synchronization method, device and equipment and a readable storage medium. The method comprises the following steps: receiving a signal; parallelization error detection is carried out on the signal based on an improved Gardner algorithm to obtain an improved error, and the improved Gardner algorithm is a Gardner algorithm after a half-symbol point pulse shape compensation item is introduced into a Gardner error formula; inputting the improved error into a proportional-integral second-order loop to obtain an updated interpolation factor; and sending the updated interpolation factor to an interpolator, wherein the updated interpolation factor is used for the interpolator to carry out interpolation processing on the signal based on the updated interpolation factor in the next period. On the premise that the blind symbol synchronization characteristic is kept, the hardware complexity and power consumption are remarkably reduced, the synchronization precision, the anti-interference capability and the recapture speed are improved, and the method is suitable for a high-speed baseband receiver, an optical communication receiving end and other high-speed digital communication systems.

The invention relates to the technical field of millimeter-wave radar signal processing, and provides a millimeter-wave radar physiological information echo signal detection method and system, which are based on a radar receiver adopting a complex baseband receiver structure, and the method comprises the following steps: receiving an echo signal by a receiving antenna, dividing the echo signal into two paths, and mixing to obtain an intermediate frequency signal; a circle fitting technology based on a nonlinear least square method is combined with a Levenberg-Marquardt algorithm to calibrate the direct current bias of the intermediate frequency signal; extracting phase signals in a target distance unit by using an improved differential cross multiplication algorithm to form a physiological signal sequence of the target; separating the physiological signal by using a mode decomposition method based on symplectic geometry to obtain a respiration signal and a heartbeat signal; mUSIC spectrum estimation is carried out on the respiration signals and the heartbeat signals, and respiration and heartbeat frequencies are obtained. By means of the method, the anti-interference performance and the detection precision of millimeter wave radar physiological information echo signal detection are improved in the face of various complex environmental factors.

This invention provides a communication system and method based on integrated photonics for optical fiber communication and wireless communication. The system includes: a baseband transmitter, a first optical fiber link, a radio frequency (RF) repeater, a second optical fiber link, and a baseband receiver. The baseband transmitter converts the original electrical signal into an optical baseband signal. The baseband transmitter and the RF repeater are connected via the first optical fiber link. The RF repeater converts the received optical baseband signal into a target electrical signal in the target terahertz frequency band. The target electrical signal is transmitted through a wireless transmission module, and a wireless receiving module receives the target electrical signal. A second integrated electro-optic modulator converts the target electrical signal into an optical intermediate frequency (IF) signal. The RF repeater and the baseband receiver are connected via the second optical fiber link. The baseband receiver converts the optical IF signal into an output electrical signal. This invention's system can balance the high speed of optical fiber communication and the flexibility of wireless communication, achieving ultra-high-speed, low-latency communication transmission across the entire link.

The present invention discloses a Bluetooth broadcast system with an isochronous link time diversity function. The present invention includes a Bluetooth baseband transmitter and a Bluetooth baseband receiver. Among them, the Bluetooth baseband transmitter has a Bluetooth baseband top-level controller, a transmission link controller, a transmission data buffer, a transmission state machine, a transmission pointer memory, and a modulator; the Bluetooth baseband receiver has a Bluetooth baseband top-level controller, a reception link controller, a reception data buffer, a reception state machine, a reception pointer memory, and a demodulator. The transmission state machine, the transmission pointer memory, the reception state machine, and the reception pointer memory constitute a time diversity controller. The present invention schedules the transmission order of event frames according to Bluetooth broadcast isochronous event parameters, realizes a pre-transmission mechanism for time diversity, and increases the reliability of transmission; and performs diversity reception at the receiving end to output the event frames in sequence. The present invention is beneficial to saving chip area and power consumption, and is easy to be applied in circuit systems such as digital chips and FPGAs.

A user equipment (UE), baseband processor, and network device are described. The UE and / or baseband processor can perform receiving, via a serving cell in a first radio frequency (RE) spectrum band, a configuration message that indicates a set of candidate transmission configuration indication (TCI) states corresponding to respective cells of a set of candidate cells for a layer 1 / layer 2 triggered mobility (LTM) procedure. The candidate cells may be in different radio frequency (RE) spectrum band. The UE or baseband receiver may receive a control message indicating a TCI state for the candidate cell and to switch to the candidate cell. The UE may then perform time and frequency tracking during a next measurement opportunity before completion of the TCI activation. The next measurement opportunity may be specific to a network controlled small gap configuration, need for gaps configuration, or autonomous gap configuration.