3 results about "Symmetric systems" patented technology

This invention discloses a monostatic symmetric nested array MIMO system and a near-field positioning method, belonging to the field of monostatic MIMO near-field positioning technology. This invention can effectively improve the positioning performance during near-field estimation. The monostatic symmetric nested array MIMO system proposed in this invention has a symmetrically distributed transmit and receive arrays. Compared to other symmetric MIMO systems, its differential array is a positionally continuous array with more degrees of freedom. With the same physical array aperture, fewer physical array elements are actually used, reducing costs. The near-field positioning method proposed in this invention calculates the fourth-order statistics of the signal and quantizes them to obtain a virtual differential array of the differential array, achieving accurate near-field positioning of sparse MIMO structure arrays. Furthermore, it can be extended to more sparse MIMO symmetric systems.

The invention, which relates to the technical field of wireless sensing, discloses a reader-integrated third-order space-time-symmetric wireless sensing system comprising a reader and a sensor which are in inductive coupling connection. The reader comprises a gain LC resonance unit and a relay LC resonance unit, and the gain LC resonance unit and the relay LC resonance unit are connected through a capacitance coupling assembly. The sensor is a loss LC resonance unit. According to the invention, the gain LC resonance unit and the relay LC resonance unit of the three-order PT symmetric system use capacitance coupling to replace the original inductance coupling mode. According to the coupling mode, the integration level of the reader can be further improved, and meanwhile the coupling coefficient of the reading end can be adjusted more conveniently and rapidly.

The application provides a PT symmetric system based on a negative impedance transformer and an energy efficiency and distance improvement method thereof, and is characterized in that: at least one negative impedance transformer is connected in series on a wireless power transmission loop, the negative impedance transformer is constructed based on a transformer and an operational amplifier, wherein: the transformer considers leakage inductance and magnetizing inductance, a primary winding of the transformer is connected in series in the transmission loop, one end of a secondary winding of the transformer is grounded, and the other end is connected to an inverting input terminal of the operational amplifier, and the operational amplifier is equivalent to a negative resistance module or a negative inductance module by configuring a resistance element or / and an inductance element on a corresponding branch. The effect is that: the flexible adjustment of the inductance ratio is realized by constructing a negative inductance on the primary side, the power extreme point is accurately approached, and the output current is optimized in combination with the primary side compensation negative resistance, so that the problem of small power is solved from the core parameter level.