4 results about "Transmit diversity" patented technology

The invention relates to the technical field of mobile communication, and discloses a 4T4R railway 5G vehicle-mounted repeater system based on an MIMO technology and a control method thereof, and the system comprises a roof 4T4R donor array antenna, a distributed carriage coverage 4T4R antenna, a near-end host unit, a cascade expansion unit, a far-end slave unit and a Beidou and inertial navigation positioning module. The units form a digital transmission link through optical fibers; according to the control method, a line electronic map and a scene-mode mapping table are loaded, train position information and adjacent cell measurement parameters are obtained, switching among spatial multiplexing, transmit diversity and beam forming is carried out under the scenes of stability, high quality, shielding, multipath, deep fading, multi-bend hills and the like, 4T4R and 2T2R self-adaption is achieved under the transmit diversity, and the method has the advantages of being simple in structure, low in cost and high in reliability. And when entering a strong interference area, forming null suppression interference based on synchronous signal block decoding and spatial domain and frequency domain filtering, and triggering soft / hard switching according to a measurement condition to improve continuous coverage and stability.

The application discloses a time synchronization method, device and equipment of a dual-antenna transmission diversity, and relates to the field of dual-antenna transmission diversity. The method comprises the following steps: at a sending end, performing frequency domain CDD processing on one of two space-time streams, and adding a synchronization header to the two space-time streams, wherein the synchronization header comprises a long preamble formed by a 512-point M sequence, and the number of delay samples of the long preamble CDD processing is 256; at a receiving end, using a sliding search window with a value of 768 to obtain the time of three correlation peaks generated by the long preamble as a time synchronization point for time synchronization. The application can ensure that the second expected correct peak value is the highest in any complex multipath scenario, thereby avoiding synchronization errors in the complex multipath scenario and avoiding demodulation failure.

Certain aspects of the present disclosure provide techniques and apparatus for power leakage mitigation in transmit diversity. A method of controlling transmit diversity includes detecting that a first compensator among a plurality of compensators is 2024 / 138489 in transmit mode; outputting a first control signal to the first compensator to enable the first compensator for transmit mode in response to detecting that the first compensator is in transmit mode; and outputting a second control signal to a second compensator among the plurality of compensators to disable the second compensator from operating in transmit mode in response to detecting that the first compensator is in transmit mode.

This disclosure relates to "Multi-Device Synchronization and Data Transmission." A first user equipment (UE) exchanges, over a side channel, at least a portion of data to be transmitted to a communication network with a second UE. The UEs then transmit the data to the network with increased transmit power by using transmit antennas of both the first UE and the second UE, rather than just those of the first UE. In some cases, the second UE can transmit a change to the data sent by the first UE to perform transmit diversity and improve signal-to-noise ratio. To avoid unintended beamforming of the transmissions, the network can mix signals received at the same time period but at different subcarriers (e.g., with the same symbol), or mix signals received at different time periods but at the same subcarrier. The network can inform the UEs of phase correction values based on the signals, and the UEs can use the phase correction values to adjust.