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1373 results about "Channel parameter" patented technology

System and Methods for Distributed Medium Access Control and QOS Scheduling in Mobile Ad-Hoc Networks

A communication device and method are provided for communicating with a receiving device over a channel within a mobile ad-hoc network. The receiving device includes a clear-to-send (CTS) packet generating portion that can generate and a CTS packet based on a parameter of the channel and that can transmit the CTS packet over the channel. The communication device includes a transmitter portion, a receiver portion and a management portion. The transmitter portion can transmit information into the channel. The receiver portion can receive information from the channel. The management portion includes a request-to-send (RTS) packet generating portion, a CTS packet receiving portion, a threshold database, a comparator and an RES packet generating portion. The management portion is in communication with the transmitter portion and the receiver portion. The RTS packet generating portion can generate a RTS packet and can provide the RTS packet to the transmitter portion. The transmitter portion can transmit the RTS packet to the receiving device by way of the channel. The receiver portion can receive the CTS packet from the receiving device by way of the channel and can provide the CTS packet to the CTS packet receiving portion. The threshold database can store a threshold value for the parameter of the channel and can provide the threshold value to the comparator. The CTS packet receiving portion can provide channel parameter information, to the comparator, based on the CTS packet. The comparator can compare the threshold value and the channel parameter information and can generate an instruction signal based on the comparison. The RES packet generating portion can generate an RES packet based on the instruction signal and can provide the RES packet to the transmitter portion.
Owner:THE JOHN HOPKINS UNIV SCHOOL OF MEDICINE

Multiple input/multiple output communication method based on distributed transmission sources

InactiveUS20070280370A1High speed downlink packet accessIncrease downlink speedSite diversitySpatial transmit diversitySignal qualityData stream
A MIMO method based on distributed transmission sources for transmitting a downlink data stream between M transmitting antennas and a mobile terminal having P receiving antennas, M and P>1, channels from at least two transmitting antennas to one of receiving antennas have different multipath distributions, said method comprises transmitting corresponding M substreams to the mobile terminal by using the same spreading code; estimating the multipath channel matrix; and processing the signal according to the multipath channel matrix to restore the downlink data stream, the estimating including measuring the total number of actual multipath received components having different delays in the transmitted signals; constructing the multipath channel matrix by taking the number as the multipath number, so that if the signal transmitted by one of the transmitting antennas to the receiving antenna has no multipath component corresponding to one of the delays, the channel parameter corresponding to the transmitting antenna, the receiving antenna and the delay is set as 0, the transmitting comprises adjusting the gain of said M sub-data streams based on the average signal quality measurement of uplink signals from the mobile terminal to said M transmitting antennas, so that average path losses of respective downlink channels are substantially equal.
Owner:UTSTARCOM TELECOM CO LTD

Synchronization and channel response estimation method suitable for OFDM system

The invention relates to a synchronization and channel response estimation method which is applicable to an OFDM system, the technical proposal is as follows: a maximum likelihood criterion ML-based cost function for the symbol timing synchronization, the carrier frequency synchronization and the channel parameter joint estimation is proposed by using an OFDM system model under a frequency selective fading channel and against the requirements on the accuracy of the transmission of high-quality information of the next generation of wireless communication system and the existing OFDM wireless communication system. A system architecture and a strategy of joint estimation symbols of timing offset Theta, carrier frequency offset Epsilon and channel impulse response h are derived from the cost function. The method comprises the following steps of carrying out the coarse synchronization and the channel response estimation and carrying out the fine synchronization and the calculation of a channel estimated value. The method can realize the balance between the calculation precision and the calculation complexity, increase or reduce the times of the iteration of the fine synchronization according to an actual system, reduce the interference during the wireless transmission, further improve the reliability of the system and improve the availability of the system.
Owner:BEIJING JIAOTONG UNIV

Multi-channel SDK (software development kit) access system and multi-channel SDK access system for mobile terminal software

The invention provides a multi-channel SDK (software development kit) access system for mobile terminal software. The system comprises a central control board, a universal SDK, a CP (computer program) interface module, a third-party SDK, a channel interface module, a channel parameter configuring and file packaging module and a file management module. The universal SDK is used for storing an SDK universal to multiple different channels. The CP interface module provides a system access interface for at least one CP and is used for file downloading or uploading or configuring of the CPs. The third-party SDK is used for storing respective SDKs provided by different channel providers. The channel interface module provides a system access interface to at least one channel providers and is used for acquiring SDKs of different channels and uploading files generated by the channel parameter configuring and file packaging module to each channel. The channel parameter configuring and file packaging module is used for receiving configuration provided by the CPs, and configuring and packaging programs, developed on the basis of the universal SDK, uploaded by the CPs according to the CP configuration and the third-party SDK so as to enable the programs to access to different channels.
Owner:BEIJING LENGJING YUNQIAO TECH

Calculation unloading and resource allocation method and device based on deep reinforcement learning

The invention provides a calculation unloading and resource allocation method and device based on deep reinforcement learning, and the method comprises the steps: calculating the total calculation resources of an MEC server based on the calculation task parameters of UE, the performance parameters of the UE, the channel parameters between the UE and an AP, and the mobile edge, and constructing anoptimization problem model; and determining the optimal solution of the optimization problem model based on deep reinforcement learning, determining the unloading decision of the UE, and respectivelyallocating the percentage of the computing resources and the percentage of the spectrum resources to the UE. According to the calculation unloading and resource allocation method and device based on deep reinforcement learning provided by the invention, the actual calculation unloading and resource allocation characteristics in the time-varying MEC system are considered, the time delay threshold of the task and the limited resource capacity constraint of the system are based on deep reinforcement learning, the DNN is used for effectively approximating a value function in reinforcement learningso as to determine a joint optimal scheme of calculation unloading and resource allocation, and the energy consumption of the UE is further reduced.
Owner:CHINA THREE GORGES UNIV
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