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.

A radio communication device with maximum channel capacity. The apparatus includes: a transmitter for allocating the transmit power of each baseband signal of each transmit antenna using feedback information recovered from the feedback signal, modulating the baseband signal with the allocated transmit power, and converting the baseband signal into an RF signal The RF signal is then transmitted; a receiver for estimating the channel response during which the received RF signal was transmitted, for recovering the information signal from the RF signal using the estimated channel response, and wirelessly converting the The information is sent to the transmitter as a feedback signal, and the transmit power is calculated and assigned based on the estimated channel response. In this channel capacity maximizing radio communication device, only information about the amount of transmission power to be allocated to the first transmission antenna is fed back. Therefore, although the amount of information in the feedback signal is minimized the channel capacity can still be maximized. In addition, decoupling transitions are not required, reducing hardware manufacturing size and cost.

A new pulse shape for CPM is introduced which is obtained by a linear combination of well-known RC and REC pulse shapes. The new pulse shape addresses the tradeoff between the width of the PSD main lobe and the rate of decay of the side lobe to improve the coded performance of multi-carrier systems affected by ACI. Also, a methodology is proposed to design and evaluate the performance of the new pulse shape for multi-carrier, coded systems based on the modulation constrained capacity. Furthermore, a binary convolutional code and the CPM modulator are concatenated using an S-random bit interleaver to lower the error floor. Finally, Laurent representation of the new pulse shape is suggested such that by retaining only the principal pulses at the receiver, complexity of the receiver can be reduced.

A method for uplink transmission based on a time division duplex (TDD) system is provided. In the method, a terminal measures downlink channel state information, estimates the state information of the uplink spatial channel using the channel reciprocity of the TDD system, and selects an uplink spatial pre-coding matrix using the state information of the uplink spatial channel based on a certain criterion, the terminal executes spatial pre-coding using the selected pre-coding matrix, and transmits the data stream to a base station via terminal transmit antennae. A terminal, a base station and a system which are based on the method are also provided. The invention uses the reciprocity of the TDD system channel fully to achieve the maximal channel capacity, thereby optimizes the uplink spatial-transmission.

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.

The invention discloses a low-complexity power control method based on a discontinuous carrier OFDM system, which adopts the second-degree parabola to replace the linear function to simulate the amplitude attenuation proportion of the power spectrum side lobe of each order of the discontinuous carrier OFDM system for power control according to the square proportion. The method comprises the following steps: (1), an order is determined; (2), the position of an available subcarrier in a spectrum pool is determined; (3), the out-of-band radiation interference information of a secondary user is fitted according to the order, and the total power is taken as the extreme water injection and distribution transmitting power; and (4), the channel capacity and the consumed power of an NC-OFDM systemare counted by statistics. The invention self-adaptively loads the transmitting power of all the subcarriers on the premise that the interference power of the secondary user to the major user is limited, meets the requirement of the highest communication speed and enables the channel capacity of the discontinuous carrier OFDM system to be maximized.

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.