48results about How to "Guaranteed estimated performance" patented technology

A method is described for transmitting, by a user equipment (UE), a demodulation reference signal (DMRS) for a physical uplink shared channel (PUSCH) in a wireless communication system. A cyclic shift field is received through a physical downlink control channel (PDCCH) from a base station. The cyclic shift field indicates first, second, third and fourth cyclic shifts, first orthogonal cover code (OCC) and a second OCC. A first DMRS sequences is generated by using the first cyclic shift and the first OCC. A second DMRS sequence is generated by using the second cyclic shift and the first OCC. A third DMRS sequence is generated by using the third cyclic shift and the second OCC. A fourth DMRS sequence is generated by using the fourth cyclic shift and the second OCC. The first, second, third and fourth DMRS sequences are transmitted to the base station.

Provided are a method and apparatus for transmitting a reference signal in a multi-antenna system. A terminal generates a plurality of reference signal sequences in which cyclic shift values that are different from each other are allocated to the respective plurality of layers, and generates an orthogonal frequency division multiplexing (SC-FDMA) symbol to which the plurality of reference signal sequences are mapped. The SC-FDMA symbol is transmitted to a base station via a plurality of antennas. Each of the reference signal sequences is multiplied by either +1 or −1 in accordance with an orthogonal covering code (OCC) index corresponding to the cyclic shift field in a DCI format transmitted via a physical downlink control channel (PDCCH) for each layer.

The invention discloses a method and device of particle filtering and target tracking. The method of particle filtering comprises the following steps that a probability density function of multiple integral points at the observation time of the last target is built by the adoption of the Gauss-Hermite integral point, an approximate particle set of the integral points is acquired according to the probability density function of the integral points, a predicted particle set is acquired by amending the approximate particle set according to relative features of the target, a predicted probability density function of a target state at the observation time of the current target is acquired according to the predicted particle set, and a posterior probability density function of the target state at the observation time of the current target is acquired according to the predicted probability density function of the target state at the observation time of the current target. According to the method, diversity and accuracy of particles are enhanced, and filtering accuracy and target state estimation performance are improved greatly.

The present invention provides a transmission signal estimation method, system, equipment and storage medium, which are used in a MIMO system. The estimation method includes: receiving external received signals; establishing a quantum population; extracting the optimal probability from the initial probability range of the quantum chromosome Update the initial probability amplitude: get the mutation probability amplitude, mixing probability amplitude and rotation probability amplitude according to the initial probability amplitude; update the initial probability amplitude according to the mixing probability amplitude and rotation probability amplitude, and extract the latest optimal probability amplitude, and increase the number of iterations by one ; Determine whether the number of iterations reaches the iteration threshold: if yes, obtain the estimated signal of the transmitted signal according to the latest optimal probability amplitude; if not, continue to update the initial probability amplitude. The invention adopts the maximum likelihood detection function algorithm to update the probability range of the quantum chromosome so that it approaches the transmission signal and converges; it solves the problem of high signal estimation complexity, reduces the number of searches and reduces the Signal estimation complexity.

An Arnoldi-based eigenvector phase compensation method, the invention relates to an Arnoldi-based eigenvector phase compensation method. The purpose of the present invention is to solve the problem of large amount of calculation in the existing eigenvector-based phase compensation method. 1. Take M target echoes, take the modulus of the complex range image to obtain the one-dimensional range image of the target echo, and use the cumulative cross-correlation method to perform envelope alignment to obtain the range-dimension compressed data after envelope alignment; 2. Calculate Obtain the sampling covariance matrix; 3. Use Arnoldi to iteratively solve the eigenvector corresponding to the maximum eigenvalue of the sampling covariance matrix, extract the phase information of each element in the eigenvector corresponding to the maximum eigenvalue, and align the distance of the envelope in one Phase compensation is performed on the three-dimensional compressed data to obtain the phase-compensated data; Fourth, the range-Doppler method is used to perform ISAR imaging on the phase-compensated data. The invention is used in the field of inverse synthetic aperture radar.

The present invention provides a large-scale MIMO wireless communication method based on pilot multiplexing. A large-scale antenna array is configured on a base station side, and a base station wirelessly communicates with multiple users on a same time-frequency resource. Pilot signals used by the different users that communicate with the base station on the same time-frequency resource are not required to be completely orthogonal, same pilot can be multiplexed between the different users, and the length of the pilot signals and the number of pilots can be smaller than the number of the users that communicate on the same time-frequency resource. The users send mutually-orthogonal detection signals, and the base station acquires statistic channel information of the users according to the received detection signals, and distributes pilot signals to dispatched users. The dispatched users send the respective distributed pilot signals, and the base station side performs uplink robust reception and downlink robust precoding transmission according to the statistic characteristics of channel estimated values and channel estimated errors. The present invention can reduce the pilot cost of a system, and improve the spectrum efficiency and the power efficiency of a wireless communications system.