2239results about How to "Improve spectral efficiency" patented technology

Techniques to transmit data on a number of transmission channels in a multi-channel communication system using multiple transmission schemes requiring less channel-state information (CSI). These schemes may include a partial-CSI transmission scheme that transmits a single data stream on each transmit antenna selected for use and a “beam-forming” transmission scheme that allocates all transmit power to a single transmission channel having the best performance. Each transmission scheme may provide good or near-optimum performance for a specific range of operating conditions (or operating SNRs). These multiple transmission schemes may then be combined in a piece-wise fashion to form a “multi-mode” transmission scheme that covers the full range of operating conditions supported by the MIMO system. The specific transmission scheme to be used for data transmission at any given moment would then be dependent on the specific operating condition experienced by the system at that moment.

Optical fiber-based distributed antenna systems that support multiple-input, multiple-output (MIMO) antenna configurations and communications. Embodiments disclosed herein include optical fiber-based distributed antenna system that can be flexibly configured to support or not support MIMO communications configurations. In one embodiment, first and second MIMO communication paths are shared on the same optical fiber using frequency conversion to avoid interference issues, wherein the second communication path is provide to a remote extension unit to remote antenna unit. In another embodiment, the optical fiber-based distributed antenna systems may be configured to allow to provide MIMO communication configurations with existing components. Existing capacity of system components are employed to create second communication paths for MIMO configurations, thereby reducing overall capacity, but allowing avoidance of frequency conversion components and remote extension units.

PCT No. PCT / FI96 / 00287 Sec. 371 Date Nov. 14, 1997 Sec. 102(e) Date Nov. 14, 1997 PCT Filed May 23, 1996 PCT Pub. No. WO96 / 37973 PCT Pub. Date Nov. 28, 1996A method for steering an antenna beam and base station equipment including at least one antenna array having a plurality of elements and at least one channel unit having a means for phasing a signal to be transmitted and received by the antenna array such that gain from the antenna array is the greatest in the desired direction. In order to improve the spectral efficiency of the system, the channel unit includes a means for searching for the incoming directions and delays of the received signal components and a means for controlling the phasing means of the opposite transmission direction based on the information.

A wireless relaying network having a number of network nodes including a designated originating node, at least one relaying node, and at least two receiving nodes. The designated originating node transmits a pilot signal, and the relaying node(s) receives and forwards the pilot signal to the receiving nodes, each of which measures channel quality based on the received pilot signal. At least part of the receiving nodes feed information on the measured channel quality all the way back to the designated originating node, and the originating node then schedules data for transmission to at least one selected node of the receiving nodes based on the received channel quality information. Subsequently, the designated originating node transmits data to the selected receiving node(s) via the same relaying node(s) that forwarded the pilot signal. In this way, multi-user diversity scheduling is introduced to relaying networks that provides significant data rate enhancements.

A method for operating a communications controller includes grouping a plurality of user equipments (UEs) in accordance with received channel condition reports, UE interference cancellation (IC) capability reports, and mobility estimates, thereby producing information about the grouping, selecting a first UE out of the plurality of UEs and a second UE out of the plurality of UEs, wherein the selecting is in accordance with the information about grouping, wherein a wide width beam is allocated to the first UE and a narrow width beam is allocated to the second UE, and wherein the wide width beam and the narrow width beam spatially overlap, co-scheduling resources of a first transmit block to the first UE and the second UE, determining first transmission parameters for the first UE and second transmission parameters for the second UE in accordance with the co-scheduled resources, and communicating with the first UE and the second UE in accordance with the first transmission parameters for the first UE and the second transmission parameters for the second UE.

The present application relates to the field of wireless communications, and in particular, to an indication method and device for a modulation coding scheme. It is used for solving the problem that in an existing LTE / LTE-A system, a higher-order modulation scheme cannot be supported, thereby limiting the further improvement of throughput in an application scenario of a high signal-to-noise ratio. The method of the embodiments of the present application includes: according to the channel quality and a first MCS table, a network side determining an MCS grade corresponding to a channel assigned to a terminal; and by means of first indication information, notifying the terminal of the determined MCS grade, so as to indicate to the terminal to determine a modulation scheme and coding rate used by the channel assigned thereto according to the MCS grade, wherein the first MCS table at least contains corresponding records of an MCS index and a TBS index corresponding to a modulation scheme with a modulation order greater than 6. The embodiments of the present application introduce a higher-order modulation scheme into an existing LTE / LTE-A system, improving the spectrum efficiency.

A method and apparatus for increasing the spectral efficiency of communications systems by employing portions of the spectrum, which portions might otherwise be reserved as all or part of guard bands and not utilized (i.e., effectively wasted), for communicating at reduced power levels between devices that are determined to experience relatively high performance (e.g., relatively little path loss, etc.). In a communication system having a first predefined maximum system transmission power level for in-band transmissions, a method is provided for determining that communication performance between a first communication device and a second communication device exceeds a performance threshold. Based on the determination, a first band-edge channel for communication between the first communication device and the second communication device (i.e., transmission from the first device to the second device and / or visa versa) is assigned. Finally, the first communication device and / or the second communication device utilize one or more band-edge channels (each may use a different band-edge channel) for transmitting a relatively reduced power level.

The invention discloses a device-to-device (D2D) sending method, a device-to-device (D2D) receiving method, a device-to-device (D2D) scheduling method and corresponding devices. The objective of the invention is to improve the transmission efficiency of device-to-device (D2D) communication. The receiving method includes the following steps that: UE1 receives a D2D data packet sent by UE2; and the UE1 checks the D2D data packet and sends feedback information indicating a check result, wherein the feedback information is an ACK or an NACK, if the feedback information is an NACK, the retransmission of the D2D data packet is received. The sending method includes the following steps that: the UE2 transmits the D2D data packet to the UE1; and when the feedback information which is sent by the UE1 and received by the UE2 is an NACK, or the UE2 receives authorization information sent by network side equipment, the UE2 re-transmits the D2D data packet to the UE1. The scheduling method includes the following steps that: the network side equipment sends first authorization information to the UE2 and schedules the UE2 to send the D2D data packet to the UE1; and if the feedback information which is sent by the UE1 and received by the network side equipment is an NACK, the network side equipment sends second authorization information to the UE2 and schedules the UE2 to re-transmit the D2D data packet.

Disclosed are a feedback information processing method, device and system, the method comprising: a first transmission node receives a signal of a data sharing channel, and determines the data transmission level indication information of a transmission block according to the signal; and the first transmission node transmits to a second transmission node the data transmission level indication information corresponding to the transmission block.

The present invention discloses an unauthorized resource use method that is applied to a base station. The method includes the steps of acquiring an unauthorized resource that is used in a cell; and broadcasting configuration information of the unauthorized resource of the cell to other base stations, so as to enable the other base stations to determine configuration of unauthorized resources of the other base stations according to the configuration information of the unauthorized resource of the cell. The present invention further discloses an unauthorized resource use method applied to user equipment (UE), a base station, UE, and an unauthorized resource use system.

Data throughput rates are increased in an optical fiber communication system without requiring replacement of the existing optical fiber in a link. Channel throughput is increased by upgrading the components and circuitry in the head and terminal of an optical fiber communication system link. Aggregate throughput in a fiber optic link is increased beyond the range of conventional Wavelength Division Multiplexed (WDM) upgrades, while precluding the necessity of replacing existing fiber plants. The increase in system throughput is achieved by using advanced modulation techniques to encode greater amounts of data into the transmitted spectrum of a channel, thereby increasing the spectral efficiency of each channel. This novel method of increasing transmission capacity by upgrading the head and terminal of the system to achieve greater spectral efficiency and hence throughput, alleviates the need to replace existing fiber plants. Spectrally efficient complex modulation techniques can be supported by interface circuits with an increased level of signal processing capability in order to both encode multiple bits into a transmitted symbol and decode the original data from the received symbols.

The invention discloses a data transmission method, a data transmission device, a base station and user equipment. The method includes the following steps that: a pre-scheduling signal is sent to the UE (user equipment) before non-authorized carriers are obtained through competition, wherein the pre-scheduling signal is used for instructing the UE to carry out data transmission on the non-authorized resources which are obtained through competition; and data transmission with the UE is carried out according to the pre-scheduling signal. With the data transmission method of the invention adopted, the problems of uncontinuous data transmission and low resource utilization rate which are caused by the limitations of resource competition and resource holding time when non-authorized carriers are adopted to carry out data transmission in the prior art can be solved; limited holding time on the non-authorized carriers can be effectively utilized, spectrum efficiency can be improved, and the time delay effect of the data transmission of the non-authorized carriers can be decreased.