45results about How to "Maximize transfer rate" patented technology

A method and for optimizing bit rate throughput in a digital communication system is provided. The method includes establishing a relationship between signal to noise ratio and plural symbol rates for a particular constellation size. The method also includes determining noise power spectral density (N(f)), wherein N(f) is determined during a silent period of line probing; determining X_k(f), wherein X_k(f) is determined by turning on a remote station transmit signal, after N(f) has been measured and determining residual echo E_k(f), wherein E_k(f) is determined by turning on a central station echo canceller.

The invention discloses an online self-adaptive bit and power distribution and code rate selection method for LED visible light communication. Firstly, a data frame correct for CRC check is reversely coded and modulated in an online normal communication process; then, SINR information is estimated by utilizing more accurate EVM; CRC check is carried out; simultaneously, the frame error rate within a certain time period is counted; the corresponding state is judged; then, a coding rate, a sub-carrier modulation strategy and a power distribution strategy are selected through an equivalent SINR and a corresponding algorithm; therefore, self-adaptive adjustment of transmission parameters in the online communication process is realized; and the transmission efficiency and the spectral utilization efficiency are increased. The method disclosed by the invention is adopted in the online normal communication process; therefore, on the premise that the communication reliability and the total transmission power are constant, the transmission rate is maximized; self-adaptive adjustment of the transmission parameters along with channel conditions in the communication process is realized; therefore, the transmission rate is closer to the channel capacity; and the spectral utilization efficiency is increased.

The invention discloses a multi-resource joint allocation and optimization method based on user service quality requirements in a perception delay tolerant network. The method comprises the steps as follows: a perception delay tolerant network model based on OFDM (Orthogonal Frequency Division Multiplexing) modulation classifies user based on service quality requirements of different users in the network into high service quality cognition users and general service quality cognition users; for the high service quality cognition users, a subcarrier bit is adopted for joine allocation based on margin self-adapting standards, and the interference power is minimized while the user business transmission rate requirements are met; and for the general service quality cognition users, a subcarrier power is adopted for joint allocation based on rate self-adapting standards, and the user transmission rate is maximized while the user total interference power is limited. The invention adopts different multi-resource joint allocation and optimization method according to different user service quality requirements, so as to realize the resource optimized allocation of the perception delay tolerant network based on the OFDM, and realize spectrum sharing while the system resource is efficiently utilized.

The invention discloses a downlink cooperative secure transmission method for a star-ground hybrid communication network. The method comprises the following steps: firstly constructing channel gain error models of a ground base station to a satellite legal node, a satellite eavesdropping node, and a ground base station node under non-ideal channel state information; then constructing a secure transmission problem which uses the node maximum transmission rate of the minimum signal to interference and noise ratio of the ground base station as an objective function, has the minimum signal to interference and noise ratio of the satellite legal node greater than the threshold, and uses the limited transmitting power of the base station as a constraint condition; transforming the signal to interference and noise ratio optimization problem into a semi-definite programming problem, designing an optimization algorithm to solve a ground station base beamforming vector; and finally transmitting the signal multiplied by the beamforming vector by the ground base station to achieve maximum synergistic interference to the satellite eavesdropping node. The method reduces the sensitivity of the network to channel state information errors and improves the reliability and confidentiality of the network.

The invention discloses a joint optimization method based on channel allocation and power control of FD-D2D. Firstly, channel allocation is performed based on a channel gain from an FD-D2D user to a cellular user, and a non-convex problem to be solved is transformed into a convex optimization problem through a series of transformations on the basis so as to obtain the optimal transmitting power ofthe FD-D2D user. In view of the interference management problem in the direct communication of a full-duplex device, the interference management problem is modeled as a problem of maximizing the total throughput of the FD-D2D user under the condition of meeting the signal to noise ratio requirements of the cellular user. By adoption of the joint optimization method disclosed by the invention, thetransmission rate of the FD-D2D user can be effectively improved on the premise of ensuring the performance of the cellular user.

The invention discloses a power distribution method for D2D user rate maximization in a cellular heterogeneous network. The method comprises the following steps that: step (10), an initialization operation is carried out; step (20), a cellular user detects an interference to generate a pricing factor and the information is broadcasted to each D2D user; step (30), the D2D users determine transmitting powers according to the pricing factor broadcasted by the cellular user, thereby carrying out information transmission; step (40), all D2D users receive the pricing factor expressed by lambda <(t+1)> m,k and determine whether the powers are updated; if a formula that |lambda <(t+1)> m,k - lambda<(t)> m,k| is less than or equal to epsilon is realized for any m,k, the D2D user stop power updating; and if a formula that |lambda <(t+1)> m,k - lambda<(t)> m,k| is larger than epsilon is realized, the step (20) is carried out again until the formula that |lambda <(t+1)> m,k - lambda<(t)> m,k| is less than or equal to epsilon is realized, wherein the epsilon expresses a determination threshold value. With the power distribution method, an objective of user rate maximization can be achieved under the cellular user interference tolerance constraint.

The invention relates to a multiple output Zigbee launcher which comprises a data acquisition module, a first data processing module, a multipath resolver, a second data processing module, a serializer, a channel estimation module and a power distribution module, wherein the data acquisition module, the first data processing module, the multipath resolver and the second data processing module are sequentially connected; and an output end of the channel estimation module is connected into the power distribution module, and an output end of the power distribution module is connected into the second data processing module. According to the multiple output Zigbee launcher, a multiple output mode is adopted, simultaneous transmission in different channels can be carried out, an optimal power distribution mode is adopted, and thus system performance maximization comprising the maximum transmission rate or the maximum sending signal covering is achieved; and at the same time, receiving sensitivity, capacity of resisting disturbance and sending signal resource optimization of a short-haul communication equipment system can also be improved.

The method aims at the problems of relatively complicated congestion control, high congestion control expense and the like of UDP transmission in P2P application at present, combines the self characteristics of the UDP transmission and the characteristics of a P2P system and provides a congestion control strategy which is controlled by a receiving party and responded by a transmitting party in the P2P system. The method regulates the packet transmission interval STP of a request packet dynamically according to the change of the intercourse time RTT of a current network, realizes end-to-end congestion control by the dynamic regulation of the STP and maximizes the transmission rate of a P2P data packet under the condition of meeting the congestion control.

The invention discloses a simultaneous wireless information and power transfer method of a cooperative relay network based on fountain code packet segmentation. The method comprises the following five steps: a source node performs fountain coding for information and broadcasts fountain coding packets to a relay node and a destination node; the relay node monitors the own energy state or information decoding state; the relay node adaptively adjusts packet number segmentation parameters that are used for energy collection and data transmission according to the monitored own energy state value or information decoding state value; data that needs to be transmitted is forwarded to the destination node by using the energy collected by the relay node; and the destination node decodes the fountain coding packets separately from the source node and the relay node to restore signals. According to the simultaneous wireless information and power transfer method disclosed by the invention, the relay node can adaptively adjust the packet number segmentation parameters that are used for energy collection and data transmission according to the monitored own energy state value or information decoding state value, the problem of network energy limitation can be solved, and the transmission performance of the system can be improved.

The invention provides a multi-user energy collection cognitive radio system in order to solve the problems of frequency spectrum uncertainty, multi-user frequency spectrum access selection and frequency spectrum sensing, access and energy collection action selection in multi-user cognitive radio. The system comprises a spectrum access strategy combined with distributed cooperative sub-broadband spectrum sensing, a spectrum sensing, access and energy collection action selection strategy learning method and a strategy implementation method. The system scheme is suitable for a distributed energycollection secondary user system, comprises the following steps: selecting an optimal sub-band from sub-bands obtained by sensing for access, intelligently deciding whether each time slot is suitablefor energy collection or information transmission, intelligently and reasonably skipping some spectrum sensing processes and the like. Therefore, the system has the obvious advantages of low controlchannel overhead, low energy consumption, high data transmission rate and the like, and has a certain engineering reference value for the design and implementation of an actual energy collection cognitive radio system.

The invention discloses a full duplex relay beam forming optimization method taking transmitting signal distortion into consideration. The method is applied to a full duplex multi-antenna decoding forwarding relay system with transmitting signal distortion. Through adoption of an iterative optimization method, beam forming vectors of a relay transmitting end and receiving end are optimized, so a transmitting rate of the system is maximized. According to the method, the transmitting rate of the system when the transmitting signal distortion exists can be effectively improved, the computing complexity is relatively low, and the method is beneficial for engineering realization.

The invention discloses a base station association and module dormancy optimization method, which comprises the following steps that: on the basis of maximizing a transmission rate and minimizing energy consumption overhead, node initial information is dynamically constructed in an opportunistic network environment, wherein nodes comprise a centralized controller, a base station and a vehicle; thevehicle collects information inside and outside the vehicle through the sensor and uploads the information to the base station; the base station uploads the collected vehicle information to a centralized controller through a front-end link; the centralized controller executes an algorithm based on the global information to obtain a base station module dormancy decision and an association decisionof the base station and the vehicle, and then issues the decision to the base station; and the base station completes association with the vehicle and allocates transmission power to the vehicle according to the dormancy or starting operation of a decision execution module. The vehicle can unload a calculation task to an edge server for calculation through a base station uplink, and the edge server sends a calculation result to the vehicle through a base station downlink. According to the invention, the maximum transmission rate is obtained in vehicle communication and the minimum energy consumption is consumed.

The invention provides a hybrid duplex relay assisted D2D communication method. The method comprises the following five steps: a system model is established; and the transmission sub-frame is cut. Inthe time slot 1, the D2D auxiliary relay receives a cellular user signal sent by the base station and sends the D2D user signal to a D2D receiving user at the same time, and full duplex communicationmode transmission is achieved; in the time slot 2, the D2D relay stops receiving the signal from the base station, and only the transmitting antenna decodes and forwards the cellular user signal received in the time slot 1 to realize half-duplex communication mode transmission; and power control is performed on the base station and the D2D relay respectively in the time slot 1 and the time slot 2to ensure that the base station and the D2D relay perform signal transmission at the optimal transmitting power. The method has wide application value in the field of mobile cellular communication technology resource management.

The invention discloses a cognitive security transmission method based on wireless information and power joint transmission. The method comprises the following steps of transmitting private information and energy information in a time slot; enabling a cognitive user ST to assist in safely forwarding private information of an authorized user in a time slot by adopting a decoding forwarding relay protocol, meanwhile, enabling a cognitive user SJ to harvest a radio frequency spectrum signal containing the energy in the step S1 by utilizing an energy harvesting technology, and then assist in safely transmitting the private information of the authorized user by adopting a cooperative interference mechanism; enabling a cognitive user ST to uses the remaining time slot T-t1 to send cognitive information to a cognitive receiver SR.. The cognitive user can provide help for safe transmission of private information of the authorized user, and the authorized user can improve a part of spectrum resources to cognitive transmission, so that win-win of the authorized user and the cognitive user is realized and development requirement of next-generation cognitive radio network safety is met.

The invention provides a bionic autonomous robot autonomous obstacle avoidance system. The system comprises: a robot body, wherein the robot body comprises a trunk part, four legs and a motion controlmechanism, and the four legs are respectively configured at four ends of the trunk part through the motion control mechanism; an environment sensing system used for acquiring surrounding environmentinformation of the robot body; an anti-collision sensor system used for detecting whether collision possibility exists around the vehicle body or not in real time to realize an autonomous obstacle avoidance function; a central controller used for converting and transmitting data information of the environment sensing system and the anti-collision sensor system; and an upper computer used for processing the data information fed back by the central controller and carrying out environment reproduction, path planning and automatic obstacle avoidance. The motion control mechanism, the environment sensing system and the anti-collision sensor system are connected with the upper computer through the central controller.

Embodiments of the invention disclose a method and a device for controlling a relay gain in bidirectional full duplex amplifying and forwarding, which are applied to a relay node located between a first source node and a second source node. The method is used for controlling the relay gain of the relay node according to different design targets and comprises the following steps: the first source node is a master node, the second source node is a slave node, and a transmission rate of the first source node needs to be maximized; the transmission rate of the first source node is not equal to the transmission rate of the second source node, and the transmission rate of the source node with a low transmission rate needs to be maximized; and the sum of the transmission rates of the first source node and the second source node needs to be maximized. By adopting the method and the device disclosed by the embodiments of the invention, the end-to-end performance of a bidirectional full duplex system can be improved, and the power consumption of the relay can be reduced.