12 results about "Coherence bandwidth" patented technology

The invention provides a satellite communication robust access method based on frequency hopping, and the method comprises the steps: a terminal recognizes interfered frequency points through an outlier detection algorithm, distributes an abandoning probability for the interfered frequency points, and screens a frequency hopping frequency set; calculating a frequency hopping interval according to the number of the users, the interference intensity and channel coherent bandwidth optimization; encoding data to be transmitted by adopting an LT code to generate an LT encoded data packet; the terminal sends an uplink access request to the satellite, if the access fails, the load threshold and the backoff time are optimized according to the priority, and the uplink access request is sent again after waiting for the backoff time; transmitting an LT coded data packet based on the optimized frequency hopping frequency set and the optimized frequency hopping interval; and the satellite receives and analyzes the LT coded data packet. Therefore, reliability and spectrum efficiency can be taken into consideration, meanwhile, self-adaption can be carried out according to the external environment, and the service requirements of different users can be met.

The present invention improves the efficiency of reporting information on the propagation characteristics of a received signal by a receiving-side device. In the present invention, a computer executes: acquiring the coherent bandwidth of a first signal received by the receiving-side device; and acquiring, on the basis of the coherent bandwidth of the first signal, the number of sub-bands when the receiving-side device acquires information on the propagation characteristics in each of a plurality of sub-bands of the first signal.

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 embodiment of the present application discloses a resource mapping method, which can determine the density of reference signals in frequency domain and time domain according to information such as subcarrier spacing configuration parameters, so that the density of the reference signals can still match the coherent bandwidth and coherent time of the corresponding channel after considering that the system works at different frequencies with different subcarrier spacings, and meets the requirements of the communication system. The method comprises the following steps: a sending end acquires at least one of subcarrier spacing configuration parameter information, current working frequency information, current supported mobile speed and scheduled bandwidth information; the sending end determines the time-frequency resource position of mapping the reference signal according to at least one of the subcarrier spacing configuration parameter information, the current working frequency information, the current supported mobile speed and the scheduled bandwidth information; and the sending end maps the reference signal at the time-frequency resource position.

To improve the efficiency of reporting information regarding the propagation characteristics of received signals by the receiving device. [Solution] The computer performs the following actions: obtains the coherent bandwidth of the first signal received by the receiving device, and obtains the number of subbands in the information regarding the propagation characteristics of each of the multiple subbands of the first signal obtained by the receiving device, based on the coherent bandwidth of the first signal.

Methods, systems, and devices for wireless communication are described. A user equipment (UE) may transmit a capability message indicating a capability of the UE to estimate a frequency domain imbalance between an in-phase portion of a transmit chain of a network entity and a quadrature-phase portion of the transmit chain of the network entity. The UE may receive an indication of a coherence bandwidth associated with the frequency domain imbalance based on the capability message. The coherence bandwidth may indicate a number of subcarriers (SC) over which a characteristic of the frequency domain imbalance (e.g., a variation in the amplitude of the frequency domain imbalance) satisfies a threshold. The UE may perform an estimation of the frequency domain imbalance based on the coherence bandwidth. In some examples, the UE may receive a downlink signal from the network entity, and may perform a correction of the downlink signal based on the estimate.

UE capability for support of machine-learning (ML) based channel environment classification may be reported by a user equipment to a base station, where the channel environment classification classifies a channel environment of a channel between the UE and a base station based on one or more of UE speed or Doppler spread, UE trajectory, frequency selectivity or delay spread, coherence bandwidth, coherence time, radio resource management (RRM) metrics, block error rate, throughput, or UE acceleration. The user equipment may receive configuration for ML based channel environment classification, including at least enabling / disabling of ML based channel environment classification. When ML based channel environment classification is enabled, UE assistance information for ML based channel environment classification, and / or an indication of the channel environment (which may be a pre-defined channel environment associated with a lookup table), may be transmitted by the user equipment to the base station.

This invention relates to an underwater acoustic communication method with adaptive adjustment of communication parameters, belonging to the field of underwater communication technology. Addressing the complex and variable marine environment, this invention collects marine environmental parameters including temperature, depth, salinity, and sea state levels. These parameters are used to directly calculate channel characteristic parameters, accurately obtaining the root mean square delay spread, coherence bandwidth, Doppler spread, and predicted signal-to-noise ratio. Based on these obtained channel characteristic parameters, communication parameters are determined, and the communication process is controlled according to these determined parameters. This invention can obtain the most suitable communication parameters under different marine conditions, thereby ensuring high reliability, high bandwidth, and low latency in acoustic communication, greatly improving the accuracy of information transmission, and effectively solving the problem of communication interruption or bit errors caused by marine channel interference.

A method and system are disclosed for dynamically scheduling sounding reference signals (SRS) in a wireless communication system based on physical-layer insights derived from channel estimation data. A machine-learned model processes the channel estimation data to extract metrics such as Doppler, delay spread, and signal-to-noise ratio (SNR), which are used by a base station scheduler to determine SRS transmission configurations for user equipment (UE). The scheduler adjusts parameters such as transmission periodicity and resource allocation based on coherence time, coherence bandwidth, and confidence levels of the extracted metrics. A control message conveying the updated configuration is transmitted to the UE. The system supports channel prediction to bridge SRS intervals and optimizes scheduling across multiple UEs based on correlated insight data.

Methods, systems, and devices for wireless communications are described. A user equipment (UE) may transmit a capability message indicating a capability of the UE to estimate a frequency domain imbalance between an in-phase portion of a transmission chain of a network entity and a quadrature-phase portion of the transmission chain of the network entity. The UE may receive, based on the capability message, an indication of a coherence bandwidth associated with the frequency domain imbalance. The coherence bandwidth may indicate a quantity of subcarriers (SCs) over which a characteristic of the frequency domain imbalance (e.g., a change in amplitude of the frequency domain imbalance) satisfies a threshold. The UE may perform an estimation of the frequency domain imbalance based on the coherence bandwidth. In some examples, the UE may receive downlink signals from a network entity and may perform a correction of the downlink signals based on the estimation.

Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive a configuration signal identifying reference signal resources for a channel measurement procedure performed on a multi-band channel, the configuration signal further identifying parameters of a feedback message associated with the channel measurement procedure, the parameters comprising a set of coherence bandwidth metrics for the multi-band channel that are to be indicated in the feedback message. The UE may perform the channel measurement procedure using the reference signal resources to identify the set of coherence bandwidth metrics for the multi-band channel. The UE may transmit the feedback message indicating the set of coherence bandwidth metrics.

This invention relates to the field of spectral composition measurement technology and discloses a remote sensing quantization method for the frequency domain characteristics of atmospheric scattered radiation. The method includes: inputting a modulated optical signal into a frequency domain demodulation channel and a coaxial reference channel; calculating transient fluctuations by sampling the DC component through the reference channel and dynamically calibrating the sampling window boundary; demodulating the optical signal within the sampling window based on a zero-point reference and extracting the center frequency offset and coherence bandwidth broadening; rigidly compressing the sampling window time when the input light intensity jump rate exceeds a sudden change threshold; and reconstructing discrete quantization indices using dimensionless operators. This invention breaks through the limitations of intensity spatial correction and utilizes the frequency domain phase evolution characteristics of scattered photons to achieve physical decoupling of heterogeneous spectral components, improving resolution and stability under complex operating conditions.