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

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.

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.

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 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.

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.

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.

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.

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.

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 system are 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.

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.

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.

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.

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.