42results about How to "Maximize system capacity" patented technology

Channel state information (CSI) can be used by a communications system to precondition transmissions between transmitter units and receiver units. In one aspect of the invention, disjoint sub-channel sets are assigned to transmit antennas located at a transmitter unit. Pilot symbols are generated and transmitted on a subset of the disjoint sub-channels. Upon receipt of the transmitted pilot symbols, the receiver units determine the CSI for the disjoint sub-channels that carried pilot symbols. These CSI values are reported to the transmitter unit, which will use these CSI values to generate CSI estimates for the disjoint sub-channels that did not carry pilot symbols. The amount of information necessary to report CSI on the reverse link can be further minimized through compression techniques and resource allocation techniques.

The invention is directed to a method of synchronising transmission between two nodes in a wireless network. The method comprises the steps of obtaining an expected interference profile for each node; and agreeing a synchronised transmission schedule between the nodes, where the expected interference profile of the or each node meets predetermined criteria.

An apparatus and method for scheduling a multiuser and a single user in a Multiple Input Multiple Output (MIMO) system are provided. The method for scheduling a multiuser and a single user at BS in MIMO system includes determining ratios of MultiUser-MIMO (MU-MIMO) chunks and Single User-MIMO (SU-MIMO) chunks to allocation chunks, determining the MU-MIMO chunks in the determined ratio and the remaining chunks as the SU-MIMO chunks, transmitting chunk information relating to the determined chunks to one or more Mobile Stations (MSs), and, when Channel Quality Information (CQI) feedback information relating to the determined MU-MIMO chunks and the determined SU-MIMO chunks is received from the MSs, allocating chunks and streams for MU-MIMO / SU-MIMO to users who maximize overall capacity using the CQI feedback information.

Speech signal classification and encoding systems and methods are disclosed herein. The signal classification is done in three steps each of them discriminating a specific signal class. First, a voice activity detector (VAD) discriminates between active and inactive speech frames. If an inactive speech frame is detected (background noise signal) then the classification chain ends and the frame is encoded with comfort noise generation (CNG). If an active speech frame is detected, the frame is subjected to a second classifier dedicated to discriminate unvoiced frames. If the classifier classifies the frame as unvoiced speech signal, the classification chain ends, and the frame is encoded using a coding method optimized for unvoiced signals. Otherwise, the speech frame is passed through to the “stable voiced” classification module. If the frame is classified as stable voiced frame, then the frame is encoded using a coding method optimized for stable voiced signals. Otherwise, the frame is likely to contain a non-stationary speech segment such as a voiced onset or rapidly evolving voiced speech signal. In this case a general-purpose speech coder is used at a high bit rate for sustaining good subjective quality.

A cellular communication system and method supporting both a time division duplexing (TDD) scheme and a frequency division duplexing (FDD) scheme. The apparatus includes a plurality of mobile stations, at least three first fixed stations communicate with the mobile station based on the FDD scheme, the first fixed station defining respective macro cells that are contiguous and form a virtual cell, and a cluster including at least one second fixed station communicating with the mobile stations based on the TDD scheme, the second fixed station defining a micro cell in the virtual cell.

A power control scheme for a wireless network communication system that includes a base station and multiple wireless mobile device dynamically adjusts transmission power of a mobile device in conjunction with adjusting its bit allocation in source coding and channel coding to minimize its total power consumption while maximizing the system capacity in terms of the total effective transmission rates received by the base station. The base station sets a target signal quality value for each mobile station, and the target values are determined by the base station such that the total effective data rate from all the mobile devices is maximized under constraints of the total received power and the error protection level requirements for the mobile devices. The base station periodically measures a signal quality value, such as a signal-to-interference ratio (SIR), from transmissions received by the base from each mobile device, compares it with the measured signal quality value for that mobile device, and sends a control signal instructing the mobile device to increase or decrease its transmission power based on the result of the comparison. When the mobile device receives the control signal, it determines an amount of adjustment to its transmission power by performing a minimum calculation under constraints on the total data distortion and the maximum transmission rate to adjust the parameters for source coding, channel coding, and transmission under the constraints to result in a redistribution of power between the components that provides the minimized total power consumption.

One or more satellites may generate multiple beams. The beams may facilitate communication over multiple communication frequency bands including a relatively high capacity frequency band and a relatively fade-resilient frequency band. The beams may overlap. User terminals and / or gateways in a beam intersection may select from among the multiple communication frequency bands to communication with the satellite(s). Responsive to detection of rain fade, some of the user terminals and / or gateways may be instructed to use the relatively fade-resilient frequency band. The multiple communication frequency bands may be assigned to the user terminals and / or gateways so as to maximize total system capacity.

The invention relates to a power distribution system and power distribution method applied to NOMA (Non-orthogonal Multiple Access). The system comprises a basic information obtaining module which is used for reading user channel state information, user target signal to interference plus noise ratios and a user grouping result; a user target rate calculation module which is used for calculating target rates of users in successfully grouped user groups; an intra-group minimum power calculation module which is used for calculating precoding vectors of each user group on the premise that user rates are greater than the target rates, thereby solving the minimum power required by each user group; a minimum power distribution module which is used for calculating power distribution factors of the users in each user group and distributing the minimum power required by each user group to the users according to the power distribution factors; and a power distribution result output module which is used for outputting a power distribution result in each user group. According to the technical scheme provided by the invention, a power distribution mechanism that the total power consumed by the users in the same group is the minimum can be supported.

High Speed Shared Control CHannel (HS-SCCH) communicating apparatus and method in Wideband Code Division Multiple Access (WCDMA) wireless communication system are provided. A receiver of a mobile communication terminal in the WCDMA communication system, which includes a speed estimator for determining a transmission interval of a Channel Quality Indicator (CQI) by measuring a channel change speed of a downlink from the signal fed from the communication module, shortening the CQI transmission interval when channel conditions changes quickly, and lengthening the CQI transmission interval when the channel conditions change slowly; and a decoder for interpreting the signal and providing the signal to an upper layer.

A subcarrier assignment apparatus and a subcarrier assignment method, in which each of a plurality of Base Stations (BSs) constituting an Orthogonal Frequency Division Multiple Access (OFDMA) communication system provides services in the capacity of a serving BS to Mobile Stations (MSs). Channel quality information for the respective MSs are fed-back from the respective BSs. Subcarriers are assigned to the respective MSs according to a corresponding scheduling scheme in consideration of the channel quality information for the respective MSs, which are fed-back from the respective BSs, and then BSs which manage the subcarriers assigned to the respective MSs according to the corresponding scheduling scheme are selected. These operations provide site diversity to each of the MSs, and thus system capacity is maximized.

A system for optimizing power allocation for each optical transmitter in an optical transmission system, the system comprises at least two intensity modulated optical transmitters, each of which is controlled by a modulator; an optical channel that can be spatially multiplexed by a multiplexer; and at least two optical detectors, for detecting the transmitted modulated signals. Each of the modulators are adapted to modulate the transmitters such that the electrical power consumption of the optical transmitters is minimized by a modulation scheme of the modulators, that uses energy efficient convex optimization to multiplex the transmitted optical signals, by the multiplexer in a multiple-input-multiple-output (MIMO) scheme. Each of the modulators are adapted to modulate the transmitters such that the capacity is maximized by a modulation scheme of the modulators, that uses energy efficient convex optimization to multiplex the transmitted optical signals, by the multiplexer in a multiple-input-multiple-output (MIMO) scheme.

Systems and methods for intelligently switching between communication modes. An optimum communication mode is selected based upon determining the mobility of the subscriber station, the location of the subscriber station, and orthogonality of signals received from the subscriber station with respect to a signal of another subscriber station. Each determination may be continually or incrementally performed according to the passage of a time interval or upon observation of changes in relevant conditions.

A subcarrier assignment apparatus and a subcarrier assignment method, in which each of a plurality of Base Stations (BSs) constituting an Orthogonal Frequency Division Multiple Access (OFDMA) communication system provides services in the capacity of a serving BS to Mobile Stations (MSs). Channel quality information for the respective MSs are fed-back from the respective BSs. Subcarriers are assigned to the respective MSs according to a corresponding scheduling scheme in consideration of the channel quality information for the respective MSs, which are fed-back from the respective BSs, and then BSs which manage the subcarriers assigned to the respective MSs according to the corresponding scheduling scheme are selected. These operations provide site diversity to each of the MSs, and thus system capacity is maximized.

A Tx beamforming method for multi-sector cooperative transmission in a multi-antenna system includes determining a transmission mode of sector boundary users according to a channel condition; determining a multi-sector cooperative Tx beam for supporting multiple users, based on the transmission mode of the user; determining a user combination for multi-sector cooperative beamforming by considering the determined multi-sector cooperative Tx beam; and performing sector cooperative Tx beamforming with the determined user combination. Thus, the overall system capacity can be enhanced.

Communication between a base station and remote stations is partitioned into frames, each including subframes having a number of slots that are allocated based on data rates for each remote station. For communication in a half-duplex mode, multiple subframes are used, each separated by a frame partition, such that a first user group of remote stations can receive down-link data in a first subframe while another user group of remote stations can transmit up-link data during that same subframe. For the next subframe, the converse happens. Slot allocation is achieved in such a half-duplex system based on weighted down-link and up-link data rates and without first or simultaneously determining user group allocation or frame partition, which are instead determined in response to the determined slot allocations for each remote station, e.g., using a linear programming technique.

A storage system for storing a plurality of fluids or other goods has a plurality of containers adapted to fit within a receptacle. Each of the containers has an inner sidewall, an outer sidewall, and a top sidewall having a spout sealable with a cap such that the container contains the fluid or other goods when the cap is engaged with the spout. The plurality of containers are shaped such that the containers are stackable or nestable within the receptacle such that the containers tessellate, the inner sidewalls of the containers abutting each other, and the outer sidewalls abutting the inner surface of the receptacle, filling substantially all of the receptacle.

The invention discloses a component channel-power allocation method of a multi-user orthogonal frequency division multiplexing (OFDM) system. Firstly, the OFDM system detects rate ratio of a user channel. Power of the OFDM system is evenly distributed to component channels, the component channels are distributed to users according to genetic algorithm, and the power is distributed for the second time according to the rate ratio. The method meets requirements of maximum system capacity and proportional fairness of the users, and lowers complexity of the algorithm.

The invention relates to a cognitive network downlink resource allocation method based on LTE (long term evolution). The method comprises steps as follows: equally allocating subcarriers in proportion; allocating the power of each user; allocating the power of each user on each subcarrier with a water injection method. According to the method, the subcarriers are allocated firstly, then subcarrier power is allocated through linear time complexity calculation, the equal proportionality principle is considered finally, meanwhile, total transmitted power constraint and master user interference threshold constraint of a system are satisfied, and the capacity of the system is maximized.

The invention relates to a learning-based multi-criteria user selection method of an amorphous cell, and belongs to the technical field of wireless communication. According to the method, users having access to a secondary cell are selected and transmitting power of the users is designed, so that interference between a primary cell and the secondary cell is restrained within certain threshold values; then, the multi-criteria user selection method with high flexibility is used for selecting served secondary users, so that the coverage area of the secondary cell is changed, meanwhile, the system capacity of the secondary cell is maximized, and design of the amorphous cell is achieved. Dynamic adjustment of the shape of the cell can be achieved, meanwhile, the system capacity of the secondary cell is maximized, and a compromise between user fairness and system performance is obtained.

A method for controlling admission of calls to a mobile communication network having cells associated with at least one determined threshold level of operation suitable for managing cell shrinking phenomena. The method includes the operation of detecting call requests from a cell edge affected by such cell shrinking phenomena, variably exceeding the determined threshold level in uplink. A method for admitting calls to the mobile communication network in both uplink and downlink on the basis of the evaluation of the actual system load is also proposed. Preferred application is in UMTS mobile networks.

The present invention discloses a method and device for generating precoding matrix codebook and a method for a base station designating precoding matrix in multi-antenna communication system. The method for generating a precoding matrix codebook includes the following steps: the step of obtaining a selection probability: obtaining a selection probability allowed for each Rank by the multi-antenna communication system in the case of a certain Signal Noise Ratio (SNR); the step of determining a codebook size: determining a precoding matrix codebook size for a corresponding Rank according to the selection probability for each Rank in the case of the certain SNR; and the step of determining a codebook: determining a precoding matrix codebook for each Rank from the precoding matrix complete set according to the codebook size for each Rank in the case of the certain SNR.

A storage system for storing a plurality of fluids or other goods has a plurality of containers adapted to fit within a receptacle. Each of the containers has an inner sidewall, an outer sidewall, and a top sidewall having a spout sealable with a cap such that the container contains the fluid or other goods when the cap is engaged with the spout. The plurality of containers are shaped such that the containers are stackable or nestable within the receptacle such that the containers tessellate, the inner sidewalls of the containers abutting each other, and the outer sidewalls abutting the inner surface of the receptacle, completely filling substantially all of the receptacle.