34results about How to "Improve wireless transmission efficiency" patented technology

Disclosed are a method and an apparatus for transmitting data in a wireless LAN system. The method for transmitting data comprises the steps of: generating a master-beacon frame including identifier information of an end-point terminal connected to a relay device; and transmitting the master-beacon frame. As a result, the occurrence of a buffer overflow in the relay device can be prevented.

A method of controlling a receiver and a transmitter to handle a transmission window size change procedure is disclosed. The method includes driving the receiver to deliver a control message having a window size parameter to the transmitter for adjusting a transmission window size of the transmitter, and driving the transmitter to output an acknowledgement message to the receiver and adjust the transmission window size according to the window size parameter when the transmitter receives the control message.

The invention provides a single transmitter to double receiver vacant resource allocation method which comprises a control channel allocation process and a data channel allocation process. The control channel allocation process comprises the steps that a control channel is divided into a reserved time slot and a competition time slot in time domain; at some point, if a node needs to use a control channel and if the reserved time slot available for the node is found, the reserved time slot is directly used; and if the reserved time slot available for the node is not found, the node competes for the competition time slot with other nodes. According to the data channel allocation process, the control channel is used to negotiate a data channel which can be used. According to the invention, the multi-channel way is used to realize parallel transmission of node data, which effectively improves the network capacity; a multi-channel frequency division multiplexing technology is used, which effectively reduces mutual interference of neighbor nodes and improves the wireless transmission efficiency; and a TDMA hybrid channel access method is used, which effectively reduces the collision probability of data packets and realizes efficient packet transmission.

The invention discloses an electric automobile wireless charging system based on the Internet of Things. The electric automobile wireless charging system based on the Internet of Things comprises a power supply end, a power supply controller and a power receiving end, wherein the power supply end comprises a network source, a distributor, a microwave power source, a waveguide tube and a microwave transmitting array antenna, the network source, the distributor, the microwave power source, the waveguide tube and the microwave transmitting array antenna are connected in sequence, the distributor and the microwave power source are arranged in a lamp pole of a street lamp, the distributor is connected with the underground network source through a coaxial cable, an antenna support is arranged on the side, facing a road surface, of the lamp pole of the street lamp, the transmitting array antenna is arranged at the outer end of the antenna support, the waveguide tube is arranged in the antenna support, the power supply controller is connected with the distributor and the microwave power source, the power receiving end comprises a wireless microwave receiving antenna and a rectification electric energy receiver connected with the wireless receiving antenna, power is supplied to a rechargeable battery by the output end of the rectification electric energy receiver, the control end of the rectification electric energy receiver is connected with a vehicle-mounted controller, and power is supplied to the rechargeable battery under the control of the vehicle-mounted controller. According to the electric automobile wireless charging system based on the Internet of Things, a wireless charging pole is combined with the street lamp, and the electric automobile wireless charging system capable of achieving roadside charging conveniently and rapidly is provided.

The embodiment of the invention provides a Bluetooth multi-channel receiving method, and relates to the field of Bluetooth communication. The method comprises the following steps: receiving cyclic redundancy check information and load data of each Bluetooth receiving branch in multiple Bluetooth receiving branches; in one mode, when the cyclic redundancy check information in at least one Bluetoothreceiving branch is correct, determining that retransmission is not carried out. The invention further provides a Bluetooth multi-channel receiving system and electronic equipment. The number of times of retransmission of the Bluetooth system is effectively reduced, so the communication efficiency is improved, and high-quality and reliable Bluetooth information transmission is completed.

The invention discloses a tumor thermotherapy device based on an implanted coil and a parameter optimization method thereof. In traditional tumor magnetic-mediated thermotherapy, it is necessary to inject heat-producing magnetic particles into the human body; and as the particles diffuse, the effect of hyperthermia decreases. The invention relates to a magnetically mediated hyperthermia device for tumors based on implanted coils, which includes internal coils and external coils. The extracorporeal coil is an open-loop single-turn circular coil. The internal body coil is a closed-loop single-turn circular coil. The radii of the external coil and the internal coil are r 1 and r 2 , the line radius is r w1 and r w2 . Among them, d is the wireless transmission distance. The invention can achieve the effect of sustainable hyperthermia on tumors.

The invention discloses an ultrasonic main shaft, which comprises a main shaft housing, a rotating shaft, a front end cover, a transmitting frame and an ultrasonic wireless transmitting device; the rotating shaft is rotatably installed in the main shaft housing, and a mounting hole; the front end cover is arranged on the front end of the main shaft housing and is arranged around the rotating shaft; the launcher is directly installed on the front end face of the front end cover and is arranged around the rotating shaft; The frame and the front end cover are connected by bolts for easy disassembly; the ultrasonic wireless transmitting device is arranged in the first accommodation groove, which includes a transmitting coil arranged around the rotating shaft and a transmitting ferrite for accommodating the transmitting coil. Compared with the prior art, the ultrasonic spindle has excellent performance, good processing effect, wide application range, many processable materials and long service life. In addition, the present invention also discloses an ultrasonic processing equipment using the above-mentioned ultrasonic spindle.