34results about How to "Improve channel conditions" patented technology

This invention relates to a method for distributing services in a hierarchical network including: distributing low speed service to a macro-area in large cover sphere and small volume by the kind of the area and the kind of the service applied by the user so as to eliminate the interference to the users in the micro-areas by the low speed service, distributing the high speed data service to the micro-areas in small cover conditions and better channel conditions to provide high quality data transmission for the high speed data service.

A method and an apparatus for uplink power control in a wireless communication system are provided. More specially, a method is provided in which a first base station in a wireless communication system periodically measures interference for a cell of a second base station neighboring the first base station, determines an average of the periodically measured interference, broadcasts the determined average of the periodically measured interference to mobile terminals located in a cell of the first base station, determines a weight for the determined average of the periodically measured interference, based on one of resource allocation information for the cell of the second base station and whether a specific message for interference regulation is received from the second base station, and transmits the determined weight to the mobile terminals.

The invention discloses a method, a piece of equipment and a system for selecting a service cell and belongs to the field of communication. The method comprises the following steps: strong-interference terminals of one or more corresponding micro base stations among terminals served by a macro base station are determined, wherein the one or more micro base stations are arranged in a macro cell served by the macro base station; and uplink communication of the determined strong-interference terminals is switched to micro cells served by the corresponding micro base stations so as to take the micro cells served by the corresponding micro base stations as uplink service cells of the strong-interference terminals. The strong-interference terminals of the corresponding micro base stations are determined among the terminals served by the macro base station, and the micro cells served by the micro base stations are taken as the uplink service cells of the terminals, which can reduce the transmission power and power consumption of the terminals; and meanwhile, the interference to the micro base station is reduced, and the service performance of the micro base station is improved. In addition, after the terminals are switched to the micro cells, the macro cell can allocate more time-frequency resources to other terminals in the service range, thus improving the service performance of the macro cell.

In the field of distributed wireless sensor network long-distance communication, the communication distance and the energy of a single node are limited, a multi-hop mode is used, bit error rate is high, and time delay is large. Accordingly, the invention discloses a cooperative communication mode of wireless sensor network beam forming transmission and a node selecting method. First, the smallest node number needed for forming a virtual antenna array is determined; then an ideal antenna direction picture of the array is determined, according to the ideal direction picture, the conditions such as array shapes and node space distance are determined, and nodes which accord with the conditions are selected to form the antenna array; and finally the nodes are managed, array nodes are coordinated, time sequence is unified, and data are sent in a combination mode in a beam forming manner. According to the method, the problem that time delay is too high, and energy loss is too large due to traditional wireless sensor network long-distance multi-hop communication can be effectively avoided, communication success probability is improved, and network lifetime is prolonged.

The invention discloses a power carrier communication system of a cable shielding layer, which comprises a plurality of power supply cable connectors, power supply cables, a plurality of cable shielding layer grounding wires, a plurality of inductive couplers, a plurality of power line carrier machines, and a plurality of data terminal equipment, wherein each power supply cable connector is in circuit connection with a cable inside a corresponding distribution substation; the power supply cables are in circuit connection between the power supply cable connectors, and the cable shielding layer is formed by the power supply cables and the a plurality of power supply cable connectors; the cable shielding layer grounding wires are in circuit connection with the corresponding power supply cable connectors; each inductive coupler comprises a primary side winding and a secondary side winding, one end of the primary side winding is earthed, and the other end of the primary side winding is in circuit connection with the corresponding cable shielding layer grounding wire; the power-line carrier machines are in circuit connection with the secondary side windings of the corresponding inductive couplers; and the data terminal equipment is in circuit connection with the power line carrier machines. According to the invention, by adopting the cable shielding layer to perform long-distance information transmission of medium-voltage carrier signals, the passage state is good, the attenuation is low and the impedance change is low.

The invention discloses a cross-layer cooperative transmission protocol in a multi-hop wireless Ad Hoc network and an application thereof. In the protocol, an information receiver and a cooperative relay in one hop are determined at the same time, the receiver is closer to a target node, and the cooperative relay has a better channel condition. Furthermore, as an inter-flow signal reference problem caused by transmission of multiple information flows existing in the network is considered, an interference factor is introduced while the cooperative relay is selected in the protocol. As a result, the selected cooperative relay while transmitting information has relatively low interference to other information flows. The basic principle and method of the invention can be applied to a multi-hop multi-flow wireless Ad Hoc network in a Rayleigh fading environment.

The invention relates to a large-scale MIMO signal detection method based on LLL-SD, which belongs to the technical field of communication testing. The method comprises steps of multiplying an initialchannel matrix by a transformation matrix to obtain a plurality of initial bases, performing LLL reduction on the plurality of initial bases at the same time to generate a plurality of reduction bases with performance differences, and selecting a reduction base with the optimal performance to obtain a channel matrix and a transformation matrix T with good orthogonality and fewer condition numbers, and performing QR decomposition on the channel matrix to obtain an upper triangular matrix and a unitary matrix, multiplying conjugate transpose of the unitary matrix by the received signal vector yto obtain an equalized signal of the received signal, performing serial interference elimination by using characteristics of the upper triangular matrix, and performing decoding by using an SD algorithm of an adaptive sphere radius. According to the method, a plurality of initial bases are used for improving channel conditions, the limitation that a traditional lattice reduction algorithm only starts searching from a single group of bases can be broken through, the algorithm complexity is low, convergence is fast, the error rate of the system is reduced, and reliability is improved.

The embodiment of the invention provides a communication resource allocation method and device and electronic equipment. The method is applied to a control device in a multi-cell NOMA network. The method comprises the following steps: when entering each preset downlink time slot, acquiring a first channel response from each base station to each terminal device on each sub-channel, a second channel response from each intelligent reflecting surface to each terminal device on each sub-channel, and a third channel response from each base station to each intelligent reflecting surface on each sub-channel in the current downlink time slot; determining a target communication resource allocation scheme in the current downlink time slot based on each acquired channel response and each preset constraint; and controlling the plurality of terminal devices, at least one intelligent reflecting surface and the plurality of base stations to allocate corresponding communication resources for themselves according to the target communication resource allocation scheme. Compared with the prior art, by applying the scheme provided by the embodiment of the invention, the information transmission performance in the multi-cell NOMA network can be improved.

The invention relates to network side equipment, a micro signal amplifier and a communication signal processing method and system thereof; the network side equipment communication signal processing method comprises the following steps: building a MSA pool for a target user device launching a service request; using a corresponding base station to send MSA pool building decision information to MSAs in the MSA pool, allowing all MSAs in the MSA pool to amplify and emit received communication signals, thus enabling the target user device to select the optimal residence community and reside; selecting MSAs satisfying preset conditions from the MSA pool, and creating a service MSA list; using the corresponding base station to send resource distribution decision information to MSAs in the MSA list, thus allowing the MSAs in the MSA list to use an adaptive amplification function to amplify and emit the received communication signals. The method and system can select the micro signal amplifier for the target user device, thus improving the user device communication quality.

The invention provides a three-dimensional RIS-assisted coal mine communication and inductance integrated network optimization method and device, and relates to the field of communication technologies and coal mine safety detection. Comprising the steps that a coal mine communication network model with a three-dimensional intelligent surface is established, and the model comprises the three-dimensional intelligent surface, a user needing communication, a sensing area, a small portable sensing integrated base station and a ground data center; the method comprises two optimization algorithms: 1, optimizing a perception communication time distribution strategy in a coal mine communication network model; secondly, the reflection coefficient matrix of the three-dimensional intelligent surface is optimized; on the premise of ensuring basic communication requirements of a coal mine, coal mine safety information is sensed and detected more effectively; on the premise of real-time monitoring at the corresponding security level, more information can be sensed as much as possible; and the RIS phase shift matrix is optimized to improve the channel condition, so that the communication efficiency is maximized. When a dangerous accident such as a collapse event occurs in a coal mine, the RIS can obtain accident information according to the change of the sensing information so as to reduce the casualty probability.