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

Multicast and broadcast data transmission method

A multicast and broadcast data transmission method is provided. The multicast and broadcast data transmission method includes transmitting, at at least one synchronized macrocell base station, Multicast and Broadcast Service (MBS) data to user equipment (UE) using radio resources allocated for MBS data transmission. Here, a relay or a small cell base station in the cell of the at least one synchronized macrocell base station keeps silent for the radio resources used for the macrocell base station to transmit MBS traffic data without performing any transmitting operation. Accordingly, it is possible to increase transmission efficiency while minimizing interference in a UE, and improve the quality of a multicast broadcast service while reducing required radio resources.
Owner:ELECTRONICS & TELECOMM RES INST

Radio relay system, radio relay apparatus, and radio relay method

A radio relay system is disclosed that is capable of preventing communication degradation in a case where radio signals are relayed using the same frequency band in a mobile communication environment. The radio relay system includes a first radio station, a second radio station, and a radio relay apparatus for relaying a radio signal that is exchanged between the first radio station and the second radio station. The radio relay apparatus includes a phase correction determining unit that determines a phase correction amount of the relayed signal based on channel information pertaining to channels established between the first radio station, the second radio station, and the radio relay apparatus, and a phase correction unit that corrects the relayed signal based on the phase correction amount determined by the phase correction determining unit.
Owner:NTT DOCOMO INC

Phase pulse system and method for bandwidth and energy efficient continuous phase modulation

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.
Owner:HUGHES NETWORK SYST

Pilot signal power control apparatus and operation method of pilot signal power control apparatus

A pilot signal power control apparatus to determine a power level of a pilot signal of a primary network to indicate an availability of a wireless resource of thereof to a secondary user of a secondary network according to a cognitive radio technology, the pilot signal power control apparatus and an operation method thereof, the pilot signal power control apparatus including: a prediction unit to predict a noise increase and / or a sensing probability, the noise increase occurring in a primary user of the primary network due to a channel estimation error, and the sensing probability being a probability that a secondary user senses the pilot signal of; a channel capacity calculation unit to calculate a channel capacity of the primary user based on the predicted noise increase and / or sensing probability; and a power level determination unit to determine the power level of the pilot signal using the calculated channel capacity.
Owner:SAMSUNG ELECTRONICS CO LTD +1

Method Of And A Device For Precoding Transmit Data Signals In A Wireless MIMO Communication System

A method of and a precoding device and a communication device for precoding transmit data signals in a wireless Multiple-Input Multiple-Output, MIMO, channel transmission scheme for maximizing channel capacity of the MIMO system given available amounts of transmit power. The precoding is expressed in a complex precoding matrix (W), which is calculated involving individual transmit power constraints of the multiple outputs (71, . . . , 7t) of the MIMO channel. The individual transmit power constraints are comprised of predetermined individual output transmit power amplifier (PA1, . . . , PAt) limitations.
Owner:TELEFON AB LM ERICSSON (PUBL)

Communication devices and methods for rf-based communication and position determination

Communication devices and corresponding methods for RF-based communication and position determination are disclosed. An initiator communication device (1) comprises an antenna unit (10) configured to transmit and receive RF signals, a beamforming unit (11) configured to perform beamforming and to control the antenna unit to transmit and / or receive RF signals using one or more selected beams, a control unit (12) configured to control the beamforming unit (11) in a training phase to perform beamforming for determining an initiator line of sight (LOS), beam to a responder communication device (2), and a processing unit (13) configured to determine the initiator LOS beam and / or initiator angular information of the initiator LOS beam and to determine the position of said communication device using the determined initiator LOS beam and / or initiator angular information in a measurement phase.
Owner:SONY CORP

Time domain equalizer for DMT modulation

A method for deriving coefficients for a time domain equalizer function (24) as implemented by a digital signal processor (35) in a DSL modem (20) is disclosed. A transmitting modem (10), such as at a central office, issues a pseudo-random training sequence that is received by the receiving modem (20). Correlation matrices are derived by the digital signal processor (35), from which sets of eigenvalues and eigenvectors are derived. A flatness constraint on the frequency response of the time domain equalizer is established, and included with a flatness scaling factor (λ) into a minimization cost function. One or more values of the flatness scaling factor (λ), preferably between minimum and maximum eigenvalues, are evaluated in the cost function, to derive the optimum filter for the time-domain equalizer. The flatness constraint ensures that the time-domain equalizer is not subject to near null conditions and large variations in its frequency response.
Owner:TEXAS INSTR INX

Resource allocation method and apparatus of heterogeneous cellular communication system

A resource allocation method and an apparatus for mitigating inter-cell interference in the heterogeneous cellular communication system are provided. The method for a first type base station to allocate resource in a wireless communication system including the first and second types base stations according to the present invention includes estimating an available Frequency Assignment (FA) not used by a neighbor second type terminal among FAs used by the first type base station, and allocating sub-channels associated with one of the available FAs not used by the neighbor second type terminal to a first type terminal, wherein the second type base station allocates the sub-channels for uplink and downlink transmissions of the second type terminal over a predetermined time period such that an FA in which sub-channels for the uplink transmissions are allocated and the FA in which sub-channels for the downlink transmissions are allocated are the same.
Owner:SAMSUNG ELECTRONICS CO LTD +1

Large-scale MIMO capacity improving method based on unmanned aerial vehicle cluster deployment

The invention discloses a large-scale MIMO capacity improving method based on unmanned aerial vehicle cluster deployment, and the method comprises the steps: firstly enabling each single-antenna unmanned aerial vehicle to be randomly deployed in an area above a multi-antenna ground base station, and enabling each unmanned aerial vehicle to assist in estimating channel state information through a geographic position system; randomly selecting one unmanned aerial vehicle to communicate with the neighbor unmanned aerial vehicle, constructing local information, and calculating the current income; learning deployment behaviors according to earnings, and keeping the positions of other unmanned aerial vehicles unchanged; and finally, determining the optimal deployment position of each unmanned aerial vehicle after a plurality of rounds of interaction. According to the invention, the channel capacity is improved by adjusting the deployment position of each unmanned aerial vehicle; and deployment is completed only by using local information without an optimization control center, so that the communication energy consumption is reduced, the communication control time delay is shortened, and the endurance and real-time control capability of the unmanned aerial vehicle cluster are improved. Applicable wireless communication scenarios include, but are not limited to, high density venue communications, battlefield communications, disaster relief and rescue communications.
Owner:SOUTHEAST UNIV

Radio communication apparatus having more channel capacity and less feedback information, and method therefor

A radio communication apparatus having maximized channel capacity, and a method thereof, preferably includes a transmitter having a plurality of transmitting antennae, wherein each transmitting antenna transmits on a channel using a transmission power that is allocated and a base-band signal that is modulated according to a feedback signal from a receiver. The feedback signal is preferably derived in the receiver using an algorithm that analyzes and processes a previously received signal from the plurality of transmitting antennae. Only information on the amount of transmission power to be allocated to a first transmitting antenna from the plurality of transmitting antennae is fed back. Therefore, the channel capacity may be maximized while minimizing the amount of information in a feedback signal. Further, decoupling conversion is not required, thereby reducing the size and cost of manufacturing hardware.
Owner:SAMSUNG ELECTRONICS CO LTD +1

Approach for processing data received from a communications channel in finite precision arithmetic applications

An approach for processing data received from a communications channel in finite precision arithmetic applications generally involves equalizing received data in the time domain prior to demodulation using finite impulse response (FIR) filtering. FIR coefficients used in FIR filtering are selected to minimize SNR degradation attributable to ISI and roundoff errors due to finite precision arithmetic, thereby maximizing channel capacity. The approach considers the communications channel noise attributable to crosstalk, white noise and analog to digital converter quantization noise, ISI attributable to failure of the equalizer coefficients to completely eliminate ISI, round off noise due to the use of finite precision arithmetic in the equalizer and roundoff noise due to the use of finite precision arithmetic in the FFT algorithm.
Owner:CALLAHAN CELLULAR L L C

Method for determining transmission power

There is a provided a method for deciding transmission power in order to transmit at least one of secret data and non-secret data. The method may comprise: determining whether data to be transmitted by a transmitting device is sensitive to a delay; determining whether both the secret data and the non-secret data are required to be simultaneously transmitted when the data to be transmitted is sensitive to the delay; and applying different weights to the secret data and the non-secret data and deciding transmission power to maximize a total channel capacity according to the application, when it is determined that both the secret data and the non-secret data are required to be transmitted.
Owner:LG ELECTRONICS INC

Decode-and-forward relaying resource allocation method for orthogonal frequency division multiplexing (OFDM) system

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.
Owner:NAT UNIV OF DEFENSE TECH

System for airborne communications

The invention achieves high Multiple Input, Multiple Output (MIMO) data rates over long wireless links by employing large ground relay MIMO antenna arrays and conformal airborne MIMO antenna arrays. Antenna transceiving element layouts and polarizations are optimized for enhanced channel capacity.
Owner:THE UNITED STATES OF AMERICA AS REPRESETNED BY THE SEC OF THE AIR FORCE

Multi-user two-way relay communication method based on interleave-division multiple-access (IDMA) technology

InactiveCN102130710AMaximize channel capacityEliminate Multiple Access InterferenceRadio transmissionNODALMulti user interference
The invention relates to a multi-user two-way relay communication method based on an interleave-division multiple-access (IDMA) technology, belonging to the technical field of wireless communications. The method comprises two stages: at the first stage: using different interleavers to distinguish different user pairs; sending information sequences of the interleaved user pairs to relay nodes; carrying out iterative multi-user detection decoding on the received information sequences by the relay nodes; and carrying out an XOR operation on the information sequences obtained by decoding the user pairs to obtain an intermediate value; and at the second stage: broadcasting the intermediate value obtained by the XOR operation to the user pairs; and after two users receive the intermediate value, utilizing the own information sequences of the two users and the intermediate value to carry out an XOR operation so as to obtain user information sequences of the other user which is communicated with one user, thus finishing the whole communication process. The method has maximum coding gains and channel capacity, is used to eliminate multi-access interference and multi-user interference by an iterative multi-user detection algorithm, and is used to acquire remarkable performance gains and the like.
Owner:TSINGHUA UNIV

Method and system for providing a maximum channel capacity in a wavelength division multiplexing transmission system

A method for providing a maximum channel capacity per optical channel in an optical wavelength division multiplexing, WDM, transmission system is described. The WDM transmission system includes transceivers using multiple optical channels in a WDM channel grid to transport optical signals modulated with a modulation format with a signal symbol rate, SR, via an optical transmission link, OTL, along an optical path from a transmitting transceiver to a receiving transceiver. A channel capacity of the optical channel is maximized while a calculated channel margin, CM, is maintained above a preset minimal channel margin value.
Owner:ADVA OPTICAL NETWORKING SE

A Beam Tracking Coverage and Enhancement Method Based on Smart Reflective Surface

An embodiment of the present invention provides a beam tracking coverage and enhancement method based on an intelligent reflective surface, including the following steps: S1, the gNB determines a target coverage area according to the historical position and speed information of the user before the link is interrupted; S2, according to the target coverage The area divides the IRS unit into several sub-arrays, and the phase shift of the IRS unit is designed to make the sub-array point to the adjacent area of ​​the target coverage area; S3 and gNB transmit to different sub-arrays of IRS by allocating the gNB under the condition of limited total power The beam power on the target area can be enhanced to achieve signal enhancement. Embodiments of the present invention provide a beam tracking coverage and enhancement method based on an intelligent reflective surface, so as to effectively reduce the impact of link interruption caused by occlusion of millimeter wave signals, thereby ensuring the continuity of communication.
Owner:BEIJING JIAOTONG UNIV

Underwater data transmission method and device

ActiveCN110581739AWork around bandwidth limitationsGuaranteed transmission efficiencyRadio transmissionForward error control useData signalUnderwater channel
The invention discloses an underwater data transmission method and device. In a time period when the data receiving node receives the data signal, calculating is performed according to a channel capacity maximization formula to obtain a ai combination when the final value of the formula is maximum, and the ai combination is fed backto the k data sending nodes, the ai=1 indicating that the data sending nodes send the data signal and the ai=0 indicating that the data sending nodes do not send the data signal; and the k data sending nodes send data signals to the data receiving node according tothe combination. According to the invention, the limitation of underwater channel bandwidth is solved through the MIMO channel model, so that the underwater sending / receiving node can send / receive data in multiple paths at the same time, the sending scheduling of the data sending node is optimized through a formula, the channel capacity is maximized, and the underwater data transmission efficiencyis ensured.
Owner:JILIN UNIV

New User Differential Selection Access Method Applicable to Non-orthogonal Multiple Access System

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.
Owner:HARBIN INST OF TECH
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