The invention relates to a system and method for calibrating a radiation channel matrix in MIMO (multiple input multiple output) via an OTA (over-the-air) radiation testing system. The invention provides an OTA radiation calibration and test operation mode for executing non-cable transmission. A DUT (device under test) is located in a noise elimination chamber which is internally provided with a plurality of probe antennas. During the period of a calibration mode, a tester is promoted to send a predetermined signal via a transmission channel, and receives measurement values of the received power and the relative phase, wherein the transmission channel comprises an OTA interface for non-cable transmission between the probe antennas of the chamber and an antenna port of the DUT. The tester builds a radiation channel matrix associated with the transmission channel by using the measurement values, and acquires an inverse matrix of the radiation channel matrix. During the period of a test mode, the test system executes an OTA radiation test for non-cable transmission. During the period of the test, the tester applies the inverse matrix to the DUT performance measurement values acquiredby the tester so as to calibrate the radiation channel matrix from the DUT performance measurement values.

System and method for calibrating radiation channel matrix in MIMO (multiple input multiple output) via OTA (over-the-air) radiation testing system

The invention relates to a channel prediction method based on an HF MIMO precoding system. A short wave time-varying channel is molded into an ARMA filter, time domain characteristics of the short wave channel are extracted for parameter estimation, and precoding is carried out according to SVD of predicated values of the channel. Compared with the prior art, feedback delay in the short wave channel and channel estimation error are taken into consideration, the predicated values of a channel matrix are utilized for design of the precoding matrix and a reception merging matrix, and influence of the feedback delay on the system performance can be reduced.

Channel prediction method based on HF MIMO precoding system

The embodiment of the invention provides a signal processing method and system, an access point and a mobile station. The method comprises the following steps: acquiring measurement information corresponding to each sending branch in multiple sending branches deployed in wide area; selecting a target sending branch from multiple sending branches based on the measurement information, wherein the amount of the target sending branch is in the first interval range; respectively sending a configuration message frame to the mobile station by adopting the target sending branch; receiving a configuration response message frame returned by the mobile station and corresponding to the configuration message frame; and sending a data frame to the mobile station by adopting the target sending branch based on the configuration response message frame. Through the signal processing method provided by the embodiment of the invention, a deep attenuation problem of a short-wave channel is solved by transmitting a space attenuation unrelated signal by using multiple sending branches deployed in wide area, the channel adaption capacity of the short-wave system is improved, and then the passability is improved.

Signal processing method and system, access point and mobile station

The invention discloses a limited feedback quantization method based on codebook rotation in the technical field of wireless communication, and aims to solve the problem that in the prior art, the feedback overhead is too high due to the fact that the feedback bit number in a large-scale MIMO system is large. The method comprises the following steps: obtaining an optimal code word selected by a client at a previous moment; selecting d code words on each of the left side and the right side of the optimal code word at the previous moment to form a virtual codebook at the current moment; and enabling the user side to select the optimal code word in the virtual codebook at the current moment and feed back the optimal code word to the base station side.

Limited feedback quantization method based on codebook rotation

The invention relates to a limited feedback precoding method based on a short wave multi-antenna system. The limited feedback precoding method specifically comprises the following steps that (1) a codebook is designed; (2) a rotating Grassmann codebook under a short wave multi-antenna system channel is obtained, (3) a sending end inputs a code stream, modulates the code stream, and multiplies the modulated code stream by a precoding vector w to generate a sending signal vector; (4) a receiving end conducts channel estimation to obtain an instant channel matrix H; (5) according to the rotating Grassmann codebook obtained in the step (2), the optimum codon w is selected, a serial number corresponding to the w is returned to the sending end through a feedback channel, and the sending end updates the precoding vector w according to the serial number; (6) the receiving end adopts the maximum likelihood method for conducting signal detection and generates an output code stream after demodulation. Compared with the prior art, the correlation of the short wave channel is considered, the bit error rate of short wave multi-antenna system communication is lowered, and the signal transmission reliability is improved.

Limited feedback precoding method based on short wave multi-antenna system

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Limited feedback precoding method based on short wave multi-antenna system

Channel prediction method based on HF MIMO precoding system