44results about How to "Improve received signal strength" patented technology

The invention discloses a multicast system radio resource optimal distribution method based on an active antenna array model. The method comprises the steps as follows: performing cluster processing to a user based on position information of the user and video request information estimated in current time period; calculating a horizontal azimuth angle and a vertical elevation angle of the central position of each user group according to the user cluster result and position information of each user group; accurately aligning the user group with a base station antenna beam; using an antenna model of an active antenna array and determining a channel gain model from the base station to the user; providing a carrier resource distribution model based on the target of maximizing throughput capacity; providing a user group clustering algorithm, and performing clustering processing to the user group according to the position information of the user group. On the basis of carrier distribution algorithm of maximizing the throughput capacity, the method of the invention improves spectrum effectiveness, resource utilization rate, system capacity and user performance.

An antenna system comprising a first antenna element, a second antenna element, and a parasitic element, wherein the parasitic element is arranged with regard to the first antenna element and the second antenna element such that a greatest difference in gain between respective antenna patterns of the first and second antenna elements occurs at a null of the pattern of the first antenna element.

The invention belongs to the technical field of navigation and positioning and discloses a low-orbit navigation constellation enhanced network RTK (real-time kinematic) technology. The low-orbit navigation constellation enhanced network RTK technology comprises the following steps: design of a global navigation and positioning constellation and multiple low-orbit constellation schemes, a low-orbitsatellite collecting orbit determination and inter-satellite link autonomous orbit determination method, design of a low-orbit satellite broadcast ephemeris and a high, medium and low-orbit satellitefusion processing unified mathematical model. The problem in the prior art that the network RTK method is low in positioning precision is solved, the baseline distance can be increased, the network density can be reduced, the cost can be reduced, the precision and the ambiguity fixing rate are increased, and the convergence time can be shortened. The sub-satellite point track coverage range of the low-orbit constellation is wide and even covers polar regions, the three-dimensional orbit errors of 60 and 192-star constellation are 46 cm and 18 cm correspondingly, the forecast precision is increased by about 30 percent compared with that of a klobuchar model, and the final positioning precision is at horizontal millimeter and height centimeter level.

A communication system is described. In one embodiment, the communication system comprises a mobile station having a transmitter to transmit packets wirelessly according to a protocol and multiple repeaters communicably coupled with the mobile station. Each of the plurality of repeaters receives one or more packets of the wirelessly transmitted packets from the mobile station. Each of the repeaters receives an indication of which of the wirelessly transmitted packets were received without errors by other repeaters and a received signal strength for those packets. The communication system also includes a switch coupled to the repeaters. Each of the repeaters forwards to the switch each packet of the wirelessly transmitted packets that each repeater had received without errors at a received signal strength higher than any other repeater.

The invention relates to a dynamic distributed antenna deployment method for enhancing the network capacity and coverage. The method comprises the following steps: deploying distributed antenna nodes on crossroads in a city network, wherein remote radio head nodes of distributed antennas can be clustered into distributed antenna cells of different forms in different ways; and when loads in the clustered cells are light, executing a radio frequency receiving-transmitting functional module of a remote radio head to transmit the same data under the configuration of a central processing server module in a center cluster head station of the clustered cells through network nodes in the same distributed antenna cell in order to enhance signal receiving intensity of users within a service range. Compared with a method for separately deploying hot-spot base stations, the dynamic distributed antenna deployment method has the advantages that the influence of interference between adjacent base stations under dense network deployment can be lowered, and the mobility problems of excessive switching times, high switching failure rate and the like due to dense deployment under the situation of a narrowed cell range are solved.

The invention discloses an IRS-assisted MISO system performance optimization method for hardware distortion, and the method comprises the steps that a multi-antenna base station wide linear precodes messages of M information users, generates a baseband transmission signal, processes the baseband transmission signal into an asymmetric Gaussian signal, and generates an output signal through a high-power amplifier; with the assistance of an intelligent reflecting surface, the multi-antenna base station transmits the output signal generated by the high-power amplifier in a broadcasting manner, and controls the phase shift of a reflecting element in real time through a controller on the intelligent reflecting surface; the rates of M information users are decoded; and by taking the rates of the M information users as performance evaluation, a base station beam forming vector and a phase shift vector at an intelligent reflecting surface are optimized under the condition of satisfying the total power constraint of the base station, and the minimum reachable rates of the information users are maximized to complete performance optimization. According to the invention, the IGS is used for transmission, so that the reachable rate of the information user is further improved.

The invention provides a method for improving received signal strength in an IRS-assisted wireless communication system. The method comprises the following steps of: respectively configuring M transceivers at proper positions of an IRS, when the positions of an AP and UE are unknown, sending signals by the transceivers, and respectively detecting the distance between the transceivers and the AP and the distance between the transceivers and the UE; and calculating to obtain estimated positions of the AP and the UE by adopting a positioning method. The method for improving the received signal strength in the IRS-assisted wireless communication system is reasonable in design, the transceiver is arranged on the IRS to determine the position of the AP or the UE, and the estimated and calculatedpositions of the AP and the UE are more accurate, so that the calculated reflection coefficient matrix is better, the received signal strength of the communication system is higher, and the spectralefficiency of the system is greatly improved.

The present invention relates to a system for taking out a mucosa calculus in a minimally invasive gallbladder surgery. The system comprises a display apparatus, a power apparatus, a negative pressure apparatus, an extraction apparatus and a washing apparatus. The power apparatus is electrically connected with the display apparatus and the extraction apparatus. The negative pressure apparatus is arranged above the power apparatus. The washing apparatus is arranged below the power apparatus. The display apparatus specifically comprises wheels, a base, a hydraulic pump, an adjusting rod, a telescopic rod, a steering ball and a display screen. The wheels are arranged below the base. The hydraulic pump is arranged above the base. The steering ball is arranged above the telescopic rod. The display screen is arranged above the steering ball. According to the system, the calculus can be taken out effectively due to arrangement of a sucker and a scratch net; the surgery process can be detected effectively due to arrangement of a camera and the display screen; and the calculus and blood block can be effectively separated due to arrangement of the washing apparatus.

The invention discloses a directional pattern reconfigurable antenna, a directional pattern reconfigurable method and a wireless terminal device. The directional pattern reconfigurable antenna includes a PCB and an array antenna arranged on the PCB. The array antenna is formed by multiple antenna subunits, and each subunit is connected to a radio frequency switching circuit via radio frequency signal sub-links. The radio frequency switching circuit is connected to a radio frequency processing unit, and the radio frequency switching circuit is used for controlling gating or closing of each antenna subunit according to switch gating control signals transmitted by the radio frequency processing unit so that the array antenna operates in a specific working mode. The invention has the followingadvantages: dynamical adjusting of a wireless coverage area can be realized, coverage distances can be increased, the received signal strength at user terminals can be enhanced, the communication quality can be improved, etc.

A terrestrial communications network for providing broadband internet access to aerial platforms is described. One set of embodiments describe assignment of cell site beams to aerial platforms to maximize signal quality in a frequency reuse of 1 network. Another set of embodiments describe time division duplexing and beam forming schemes for minimizing co-channel interference. Systems and methods for establishing links from aerial platforms to cell sites, and mobility management of aerial platforms, to maximize signal quality are described. In another set of embodiments, systems and methods are described to mitigate fading due to ground reflection.

The invention discloses a transmission method using limiting feedback information in a multi-antenna two-hop relay system. The transmission method comprises the following steps: firstly, the system confirms the feedback bit number on two feedback links according to information such as the transmitting power and the antenna numbers of a base station and a relay station, the limited performance loss thresholds, the user antenna numbers and the like, and selects a limited number of multi-antenna users which meet the requirement on the antenna number to wait for receiving the data by adopting a random schedule method; secondly the relay station and each user obtain the channel information from the base station to the relay station and from the relay station to the user through the channel estimation respectively; subsequently the relay station and the user quantize the obtained channel information respectively, and feed back the information to a prior stage through a limited number of bits determined by the system; finally, the base station and the relay station carry out precoding transmission according to the channel information obtained through the feedback respectively. With the adoption of the transmission method, the covering range of a cell of origin is widened effectively; and a system accessible transmission rate which is approximate to ideal channel information condition is obtained.

The invention provides a CoMP-based heterogeneous network resource allocation method and system. According to the method, resource co-allocation is described as the problem of nonlinear mixed integerprogramming, and the iterative algorithm of low complexity is designed to search the optimal solution of the problem. The original resource co-allocation problem is decomposed into two sub-problems ofchannel allocation and power allocation in each time of iteration so as to reduce the computing complexity. The greedy algorithm is put forward for the sub-problem of channel allocation to solve theoptimal solution. The water-filling algorithm based on iteration is designed for the decomposed sub-problem of power allocation. Channel and power allocation is performed based on the acquired result.The theoretical analysis proves that the method can obtain the optimal solution within the reasonable time at the low complexity.

The invention belongs to the technical field of wireless communications and particularly relates to a wireless transmission method and a network. The wireless transmission method is characterized in that a wireless transmission network is partitioned, different partitions are respectively arranged as a transmission partition and a standby partition, different sleep scheduling strategies are divided for each partition by adopting a sleep scheduling mechanism; in the data transmission stage, nodes in the same partition adopt a probability forwarding mechanism to select a proper node for concurrent transmission in the partition; and the data is transmitted from the partition where an initial node is located until an end node successfully receives the data. By adoption of the method, low energy consumption and low delay of data transmission can be achieved on the strip wireless sensor networks. The method is particularly suitable for application to the strip wireless sensor networks needing low delay and low energy consumption.

System enhancement(s) are disclosed that can add capabilities, such as, using Frequency Division Multiple Access (FDMA) and/or Time Division Multiple Access (TDMA) and/or Frequency Division Duplex (FDD) capabilities along with Multi-Input Multi-Output (MIMO) antennas and/or Global Positioning System (GPS) synchronization. The use of two radios in both the base-station and the subscriber-station, i.e., customer premises equipment (CPE), e.g., can allow frequency division to be utilized, exploiting higher receive gains at the CPE while not affecting transmissions occurring on the other radio's frequency.

The invention discloses a terminal communication control method, a device, a storage medium and a terminal. The method comprises the following steps: obtaining a current signal strength value of the terminal under a current data transmission mode; determining whether the current signal strength value is less than or equal to a set threshold value of the terminal under the current communication mode; if the current signal strength value is less than or equal to the set threshold value, the main antenna of the terminal is switched from the first set position to the second set position to increase the current signal strength value to be greater than the set threshold value. The scheme of the invention can solve the problem that the broadband spectrum covered by the radiated energy of the faster digital transmission rate causes serious interference to the mobile phone communication and causes the signal-to-noise ratio of the received signal of the mobile phone to become worse, and achievesthe effect of improving the signal-to-noise ratio of the received signal of the mobile phone.

The invention discloses a composite structure for data communication. The composite structure comprises an antenna support and a middle frame which are connected with each other in a spliced mode; the antenna support comprises a base plate, multiple notches used for accommodating antennas are abreast formed in the upper surface of the base plate, and the lower surface of the base plate is provided with a first splicing piece; the middle frame comprises a middle plate, and the middle plate is provided with a second splicing piece matched with the first splicing piece. In the composite structure for data communication, the connecting mode of the middle frame and the antenna support is simple, stable, low in cost and convenient to assemble and disassemble; the multi-notch arrangement of the antenna support makes multiple antennas can be arranged on a product to improve the strength of data transmission and receiving of the antennas; the separation arrangement avoids the phenomenon of antenna cross talk, and accordingly avoids instability of signal receiving of the product.

The embodiment of the invention discloses a shark fin vehicle-mounted antenna integrated with a Beidou free flow terminal, which comprises a bottom plate and a shark fin-shaped shell, wherein a circuit board consistent with the bottom surface of the shell in shape is arranged on the bottom plate, the circuit board is connected and grounded with a vehicle roof through the bottom plate, and the Beidou free flow terminal is integrated on the circuit board. The Beidou free flow terminal comprises a positioning antenna adopting a high-precision multi-point feed stacking design, and the positioning antenna is arranged at the rear end of the circuit board. The Beidou free flow terminal is integrated in the shark fin antenna on the roof, the installation position of the antenna is not easy to limit, and the performance of each antenna can be greatly improved, thereby improving the positioning precision and communication distance of the Beidou free flow terminal.