6 results about "Complex gain" patented technology

The application provides a near-field channel parameter estimation method considering spatial non-stationary characteristics, which comprises the following steps: obtaining a multipath parameter initial value by using a far-field SAGE algorithm; calculating propagation distances of array elements at a transmitting end and a receiving end to scattering points, constructing a near-field channel response, and performing refined estimation on angle and distance parameters, time delay parameters and complex gain parameters of the multipath. Correlation operation is performed on a current residual signal and the near-field channel response in a frequency domain to obtain an array element level correlation metric. Continuous spatial non-stationary coefficients with a value of 0 to 1 are updated based on the correlation metric, and weighting iteration is performed on residual construction and parameter updating until a stop criterion is met, and near-field geometric parameters, time delay parameters, complex gain parameters of each multipath and spatial non-stationary coefficients of both transmitting and receiving ends are output. The method solves the problem of inconsistent multipath visible domains under XL-MIMO arrays, can suppress the influence of invisible array elements on parameter estimation, and improves the estimation accuracy and stability of the SAGE algorithm under the condition of near-field spatial non-stationary channels.

This invention provides a SIW TE20 and TM11 hybrid mode equalizer based on a three-dimensional multilayer substrate. The equalizer includes a multilayer dielectric substrate, an input / output transition structure, a substrate-integrated waveguide, a circular resonant cavity, and a dual-mode perturbation device. The physical structure of the equalizer consists of two dielectric substrates defined as an upper and lower dielectric layer, and three metal layers. This invention utilizes a stacked structure to vertically integrate the transmission layer and the resonant layer, reducing the device's planar area. Combined with the fully enclosed characteristics of SIW, it exhibits advantages such as low loss and high Q value at high frequencies. Furthermore, by utilizing the degeneracy of the TM11 mode and symmetrical via perturbation within the circular resonant cavity, two electrically independent resonant peaks are achieved within a single physical cavity, with adjustable frequency spacing. This allows for flexible fitting of complex gain curves. The antisymmetry of the TE20 mode excites the TM11 mode, naturally suppressing unwanted fundamental modes and improving the equalizer's response accuracy.

The application provides an AGV communication channel modeling method and system based on an ellipsoid geometry random model, and belongs to the technical field of wireless communication channel modeling; the method comprises the following steps: a three-dimensional digital scene covering multiple frequency bands, AGV speeds and container densities is constructed, and a multi-dimensional channel data set is constructed based on ray tracing; a dynamic ellipsoid geometry model with a fixed base station and an AGV as the focus is constructed, and a time-varying characteristic is introduced by updating the AGV position in real time; the communication channel is divided into three parts, namely, a line-of-sight part, a ground reflection part and a non-line-of-sight part, the channel complex gains of the three parts are respectively modeled, and are superimposed to synthesize the channel impulse response under the FR3 frequency band. Through the introduction of the speed-dependent Doppler effect and the density-dependent metal scattering mechanism, the time-varying non-stationary characteristics of the AGV channel in the metal dense scene of the port can be accurately described, and efficient and accurate theoretical model support is provided for the intelligent port AGV communication design.

This invention belongs to the field of integrated sensing technology for millimeter-wave communication, specifically relating to a sensing-assisted adaptive tracking method for millimeter-wave channels. The method includes: constructing a time-division duplex frame structure, divided into sensing time slots and communication time slots; in the downlink phase of each sensing time slot: updating the environmental scatterer set information through a multi-target tracking algorithm to construct the channel geometry, including determining multiple non-line-of-sight propagation paths and the path parameters of each path; constructing the geometry of each path based on its path parameters; in the uplink phase: acquiring the prior geometry of each path and the statistical prior of the complex gain of the current sensing time slot to obtain the updated complex gain of that path; in the uplink phase of each communication time slot: acquiring the prior geometry of each valid existing path and the statistical prior of the complex gain of the current communication time slot to obtain the updated complex gain of that path. This invention achieves adaptive channel tracking for dynamic scenarios with path creation and disappearance.

This invention relates to the field of physical layer secure communication technology, and provides a method and apparatus for synchronously generating group keys and paired keys. The method includes: a central node acquiring the azimuth angles and corresponding channel complex gains of each edge node, designing the switching array parameters of a time modulation array based on the azimuth angles of each edge node, calculating the average radiation pattern coefficients of all edge nodes, and transmitting them collectively; the central node generating a group key and modulating it into a modulated signal using the time modulation array and transmitting it; the central node generating corresponding paired keys for each edge node and encrypting them to obtain paired key ciphertext, which is then sent to the corresponding edge node; each edge node receiving the modulated signal performs coherent demodulation to obtain demodulated symbols, performs hard decision on the demodulated symbols, and obtains the group key; each edge node decrypts the paired key ciphertext using the average radiation pattern coefficients and the demodulated symbols to obtain the paired key.

The application provides a three-dimensional multilayer substrate-based SIW TE20 and TM11 mixed mode equalizer, which comprises a multilayer dielectric substrate, an input / output transition structure, a substrate integrated waveguide, a circular resonant cavity and a bimodal perturbation device, and the physical structure of the equalizer is composed of two layers of dielectric substrates defined as an upper layer of dielectric and a lower layer of dielectric and three layers of metal layers. The application scheme vertically integrates the transmission layer and the resonant layer by using the laminated structure, reduces the planar area of the device, combines the fully enclosed characteristics of the SIW, has the advantages of low loss and high Q value at high frequencies, simultaneously, the degenerate characteristics of the TM11 mode and the symmetric via perturbation are utilized in the circular resonant cavity, two electrically independent resonant peaks are realized in one physical cavity, the frequency interval is adjustable, the complex gain curve can be flexibly fitted, the TM11 mode is excited by using the antisymmetry of the TE20 mode, the unwanted base mode is naturally suppressed, and the response accuracy of the equalizer is improved.