6 results about "Time diversity" patented technology

This invention discloses a multi-domain joint error correction system for a dual-frequency swarm array, belonging to the field of radar signal processing technology. It obtains correction signals from multiple correction sources through time diversity, with each source transmitting correction signals to the swarm array with a position error exceeding half a wavelength via two carrier frequencies. A simplified SMSSWF method is used to estimate the actual steering vectors of the two carrier frequencies. Based on these steering vectors, the equivalent frequency method is used to calculate the position error, obtaining estimated values ​​for the array element position error parameters. After updating the array element position information using these estimated values, the received signals from the two carrier frequencies are used to estimate the position error, phase error, and communication delay error, respectively, completing the joint error correction for the swarm array with a position error exceeding half a wavelength. The dual-frequency position error estimation based on the equivalent frequency method fully utilizes the large error estimation range of the dual-frequency method while retaining the high accuracy of traditional methods, successfully correcting errors even when the position error exceeds half a wavelength.

The invention relates to the technical field of communication, in particular to a self-adaptive multi-joint diversity method, system and equipment based on an evaporation waveguide channel and a medium. Meteorological parameters are collected, system diversity parameters are defined, a corrected refractive index profile is constructed, and the height of an evaporation waveguide is determined; based on the corrected refractive index profile, an initial field is calculated through a primary algorithm, the generated initial field is placed in a constructed refractive index profile environment, propagation and output field intensity distribution of an electromagnetic field in a non-uniform medium are solved step by step, RMS time delay spread is calculated through a secondary algorithm, coherent bandwidth is estimated, and the minimum frequency interval is determined based on the coherent bandwidth. Adjusting the minimum frequency interval; the method comprises the following steps: comparing a frequency interval with a minimum frequency interval, adaptively adjusting the frequency interval, respectively simulating space diversity, time diversity and frequency diversity, superposing different diversity, calculating outage probability and fading depth under different diversity, reducing depth fading caused by severe fluctuation of signal amplitude, and improving system availability.

The application discloses a kind of ultraviolet communication signal processing method and device, it is related to ultraviolet light wireless communication field.The existing kilometer-level communication, error rate is high, communication algorithm is complex.Spread spectrum processing is carried out to the bit sequence to be transmitted, the spread spectrum code obtained by each bit is evenly divided into multiple chip clusters according to the number of time diversity, and the chip clusters corresponding to all bits are interleaved in each time diversity;Pulse shaping is carried out on the interleaved chip clusters under each time diversity, intensity modulation symbols are obtained, and an ultraviolet emitter is driven to emit an ultraviolet light signal;The ultraviolet receiver collects the ultraviolet light signal sequentially adopts threshold sampling strategy, deinterleaving method and despreading processing, and restores the complete bit sequence.It is used to solve the problem of communication error rate and transmission rate.

The invention discloses an adaptive joint channel estimation method and device based on a time diversity technology, and the method comprises the steps: carrying out the down-sampling and OFDM demodulation of receiving data, obtaining the frequency domain data of a TB block of a binding time slot, and extracting a first receiving demodulation reference signal of each OFDM symbol in each time slot in the TB block of the binding time slot from the frequency domain data; generating a known sending demodulation reference signal of each OFDM symbol in each time slot in the TB blocks bound with the time slots; according to the frequency domain data, the first receiving demodulation reference signal and a known sending demodulation reference signal, carrying out adaptive joint channel estimation on each partial time slot block in the TB blocks bound with the time slots to obtain estimated sending data of each time slot in the partial time slot blocks; and splicing and decoding the estimated sending data of each time slot in all the partial time slot blocks to obtain sending information of the TB blocks bound with the time slots. The method is adaptive to a flexible time slot system, and joint channel estimation among part of time slots improves the channel estimation precision.

The application discloses a millimeter wave radar human vital sign monitoring method and system based on a diversity mechanism, which comprises a millimeter wave radar having a plurality of transmitting antennas for transmitting millimeter wave signals to the environment and a plurality of receiving antennas for receiving signals reflected by the human body and objects; and a signal processing module for mixing the reflected signals received by the receiving antennas, implementing spatial diversity at the position of the human body to obtain the reflected components of the human body position, estimating echo static components to extract dynamic signals, obtaining dynamic components, implementing time diversity on the echo dynamic components at multiple time points to improve the signal-to-noise ratio, extracting phases and unwrapping the signals after time diversity, performing band-pass filtering and cycle estimation in the time domain to obtain the respiration rate and heart rate of the target. The application utilizes the diversity method to improve the human vital sign monitoring accuracy in a complex environment and at a long distance by comprehensively using the data of multiple antennas and multiple pulses.

The invention discloses an ultraviolet communication signal processing method and device, and relates to the field of ultraviolet wireless communication. Existing kilometer-level communication is high in error rate and complex in communication algorithm. Performing spread spectrum processing on a bit sequence to be transmitted, averagely dividing a spread spectrum code obtained by each bit into a plurality of chip clusters according to the number of time diversity, and interleaving the chip clusters corresponding to all bits in each time diversity; performing pulse shaping on the chip clusters interleaved under each time diversity to obtain an intensity modulation symbol, and driving an ultraviolet emitter to emit an ultraviolet light signal; and an ultraviolet receiver collects the ultraviolet light signal and sequentially adopts a threshold sampling strategy, a de-interleaving method and de-spreading processing to recover a complete bit sequence. The method is used for solving the problems of communication error rate and sending rate.