4 results about "Spatial multiplexing gain" patented technology

The invention provides a satellite downlink hidden transmission method based on an MIMO (Multiple Input Multiple Output) technology. According to the method, satellite hidden transmission in a mobile scene is supported, the processing complexity of a multi-layer weighted fractional order Fourier transform modulation signal method is reduced, and the real-time performance of synchronous distribution is improved; according to the scheme of the invention, a satellite counts state information by using a slowly varying channel between the satellite and a ground station, dynamically calculates a hidden processing matrix according to a minimum mean square error criterion, and pre-processes to-be-transmitted data in real time, so that the anti-interception and anti-cracking capability of downlink transmission data is improved; a hidden processing matrix is introduced into a satellite transmitting end, mass data are mapped to multiple antennas in parallel to be transmitted out at the same time after space-time hidden processing, and the transmission rate of a system and the anti-interception capability of the data are improved by utilizing spatial multiplexing gain provided by an MIMO technology under the condition that the frequency is the same and the transmitting power is not increased.

Various devices, systems, and / or methods perform wireless chip to chip high speed data transmission. Strategies for such transmission include use of improved microbump antennas, wireless chip to chip interconnects, precoding and decoding strategies, channel design to achieve spatial multiplexing gain in line of sight transmissions, open cavity chip design for improved transmission, and / or mixed signal channel equalization.

The application discloses a wireless optical downlink multiple access communication method based on an optical intelligent reflecting surface, and the method comprises the following steps: optimizing at least one user group by using a preset optimization constraint, and determining a multiple access mode between multiple users according to the optimized at least one user group; obtaining optimal optical intelligent reflecting surface parameters and optimal transmission end transmission power distribution coefficients reflected by the intelligent surface; combining the optimal optical intelligent reflecting surface parameters, the optimal transmission end transmission power distribution coefficients and the multiple access mode to generate a corresponding multiple user signal transmission strategy, so as to perform signal transmission by using the multiple user signal transmission strategy. Thus, the technical problem that the wireless optical communication system communication is prone to interruption is solved, the system performance deterioration caused by the non-ideality of the serial interference cancellation is reduced, the spatial multiplexing gain of the wireless optical communication is improved, the channel capacity of the wireless optical communication system is increased, and the multi-user access capability of the wireless optical communication system is improved.

The invention relates to the field of millimeter wave dual-polarized multi-beam antenna arrays, and particularly discloses a compact dual-polarized millimeter wave multi-beam antenna array, which comprises a transition structure, a dual-mode Butler matrix and a dual-polarized antenna, the input end of the transition structure is connected with the radio frequency interface, and the output end is connected with the input end of the dual-mode Butler matrix; the output end of the dual-mode Butler matrix is connected with the input end of the dual-polarized antenna; compared with the traditional discrete design, the high integration level and miniaturization significantly reduce the physical size of the antenna array, the coverage range of the antenna array is expanded, a single array can replace multiple sets of narrow beam antennas, and the number of devices is reduced; spatial multiplexing gain is achieved, multi-user parallel communication or multi-path transmission is supported, and the system capacity and the spectrum efficiency are improved; the dual polarization performance is improved, the polarization multiplexing gain is increased, independent data streams are transmitted through two orthogonal polarization channels under the same time-frequency resource, and the spectrum efficiency can be theoretically improved by two times.