34results about How to "Maximize channel capacity" patented technology

A multi-input multi-output (MIMO) radio communication apparatus and method are provided. The MIMO apparatus includes a plurality of reception antennas each having a plurality of antenna patterns; a channel matrix estimation unit for estimating a channel matrix between a plurality of transmission antennas and the plurality of reception antennas; a channel capacity calculation unit for calculating a channel capacity corresponding to a combination of antenna patterns of the plurality of reception antennas by using the estimated channel matrix; and an antenna pattern control unit for changing the antenna patterns of the plurality of reception antennas to maximize the channel capacity. According to the MIMO radio communication apparatus and method, direction can be controlled adaptively to a propagation environment.

The invention discloses an underwater data transmission method and device. During the period of time when a data receiving node receives a data signal, the combination of the maximum final value of the formula is calculated according to the channel capacity maximization formula, and the combination is fed back to k k data sending nodes, wherein, means that the data sending nodes send data signals, means that the data sending nodes do not send data signals; k data sending nodes send data signals to data receiving nodes according to the combination of . The invention solves the limitation of the underwater channel bandwidth through the MIMO channel model, so that the underwater sending / receiving nodes can simultaneously send / receive data in multiple channels, and optimize the sending scheduling of the data sending nodes through the formula, so as to maximize the channel capacity and ensure Efficiency of underwater data transmission.

Methods and apparatus for processing an OFDM MIMO signal in a system having at least two transmitters arranged to transmit an output signal pair that includes operating a series of transformations on a pair of input signals so that each stream of the output signal pair contains decodable information from both streams of the input signal pair.

The invention provides a resource allocation method for a relay node adopting decode-and-forward transmission mode in a collaborative orthogonal frequency division multiplexing system. A first technical scheme is applied to total system power restraint conditions, and specifically comprises the following steps of: 1, sub-carrier matching and relay node selection; 2, the power allocation of sub-carrier pairs; and 3, the power allocation between the sub-carriers in each sub-carrier pair. By the first technical scheme, the execution of the power allocation is simplified. A second technical scheme is applied to node power independently-restrained conditions, and specifically comprises the following steps of: 1, the sub-carrier matching; 2, initial power allocation; 3, the power regulation of each sub-carrier of the relay node; and 4, the recovery of surplus power of a source node. By the second technical scheme, the total power consumption of a system is minimized on the basis of ensuring the maximum of system capacity so as to fulfill the aim of prolonging the time to live of the node.

The invention provides a differential new user selection access method applicable to a non-orthogonal multi-access system, and relates to differential new user selection access technology applicable to non-orthogonal multi-access systems. The differential new user selection access method is used for enabling new users in the non-orthogonal multi-access system to better access the network. The method comprises the following steps: a first step, establishing an information resource pool of a full-band candidate user set; a second step, selecting sub-bands which satisfy bandwidth requirements; a third step, sequentially calculating differences of signal to interference plus noise power ratios; a fourth step, calculating a ratio A<l> of the number of users, satisfying preset standards, of each sub-band to the total number of candidate users of the sub-band, and sorting the ratios A<l> from small to large; a fifth step, carrying out selection according to the expression described in the specification; and a sixth step, carrying out non-orthogonal coding on the new access user information and other candidate user information through superposition coding, and conducting signal transmission. The differential new user selection access method provided by the invention is applicable to the differential new user selection access of the non-orthogonal multi-access system, and can satisfy the demand of a 5G new user access solution in the future.