1142 results about "Modulation coding" patented technology

A rate-adaptive method of communicating over a multipath wireless communication system uses multiple links such that each end of a link uses multiple transmit and receive antennas. A number of independent streams that are to be transmitted for each link is determined based on an overall system performance measure. In addition, the system may also jointly determine the best modulation, coding, power control, and frequency assignment for each link, based on an overall system performance measure. In OFDM systems, the number of independent streams, as well as the modulation, coding, and power control, may be determined on a tone-by-tone basis based on an overall system performance measure.

The invention relates to a DCI (Downlink Control Information) sending method, system and device as well as an transmission uplink method, system and device, relating to the technical field of wireless communication and aiming at solving the problem that a network side is difficult to dispatch a user terminal to carry out uplink transmission because the traditional DCI does not support an LTE-A (Long Term Evolution-Advanced) system in the prior art. The DCI sending method disclosed by the embodiment of the invention comprises the following steps that: the network side generates the DCI used for dispatching the uplink transmission; the network side sends the generated DCI, wherein the DCI comprises the following information: resource indication information, modulation indication information, data indication information, mapping indication information and precoding indication information, wherein the resource indication information is used for indicating the positions of allocated resources; the modulation indication information is used for indicating a modulation coding order of a transmission block; the data indication information is used for indicating whether the transmission block transmits new data or not; the mapping indication information is used for indicating the corresponding relationship of the transmission block and a code word; and the precoding indication information is used for indicating the size of an uplink transmission order and an index of a used precoding code word. The DCI sending method can be used for enhancing the efficiency of the uplink transmission.

An apparatus and method for determining a modulation order of packet data to be transmitted through a subcarrier in a transmission apparatus. In the apparatus and method, transmitter physical channels encode and modulate data to transmit the user data with OFDM symbols. A controller outputs packet data to the transmitter physical channels, and determines the number of transmission slots, the number of OFDM symbols, the number of subchannels, and a size of an encoder packet. A modulation order and code rate decider receives, from the controller, the number of transmission slots, the number of OFDM symbols, the number of subchannels, and a size of an encoder packet, calculates a Modulation order Product code Rate (MPR), determines a modulation order according to the MPR, and outputs the determined modulation order to a corresponding physical channel.

The embodiment of the invention discloses a method and equipment for determining multi-cell channel information. Multi-cell channel quality information fed back by a terminal, channel state information between each cell and the terminal and interference information of each cell to the resource information distributed by the terminal are utilized in a base station, and then user scheduling, interference coordination and modulation and coding mode selection are performed so as to improve the throughput and processing efficiency of multi-cell combined processing.

The invention discloses an interference measurement signaling notification method which comprises the following steps: a network side notifies M subframes information contained in a subframe set of interference measurement or a channel quality measurement subframe set to a terminal. The invention discloses an interference measurement method which comprises the following steps: the terminal receives an notification of subframe set of interference measurement or channel quality measurement subframe set information sent by the network side, carries out interference measurement on each subframe in the subframe set of interference measurement or channel quality measurement subframe set, and calculates an average interference value; the terminal determines CQI (channels quality indication) information according to the average interference value, and sends the interference value back to a base station. The invention discloses a channel quality information feedback method which comprises the following steps: the terminal appoints a subframe to carry out interference measurement at the base station, determines CQI according to a measurement result, and sends the CQI back to the base station. The invention discloses apparatuses for realizing the above methods. In the invention, the base station can accurately determines a modulation coding mode of the terminal according to the interference measurement result, and data transmission efficiency is raised.

Coordination and synchronization is performed between two or more wireless network managers (e.g., access points (APs)). A first wireless network manager supports first communications with first other wireless communication devices, and a second wireless network manager supports second communications with those first and/or second other wirelessly case devices. The first and second wireless network managers also support communications with one another to coordinate the first and second communications supported with the first and/or second other wireless communication devices. Examples of coordination include selection of which other wireless communication devices are serviced or in communication with which of the first and second wireless network managers, selection of operational parameters (e.g., modulation coding set (MCS), beamforming, frequency band assignment, channel assignment, scheduling information, transmit power, etc.) for the first and second wireless communication devices, synchronization to a common clock (e.g., using timing synchronization function (TSF)).

The application discloses a mobile communication system and a terminal direct unicast transmission control method. The method includes the following steps: a first terminal sends a first type of sub-link control signaling, including a first terminal identifier, a second terminal identifier, a resource allocation identifier and a modulation and coding identifier; a second terminal receives a sub-link data signal, and generates a channel quality indicator and re-transmission request information; the second terminal sends a second type of sub-link control signaling to the first terminal, including the second terminal identifier, the first terminal identifier, the channel quality indicator and the re-transmission request information; the first terminal receives the second type of sub-link control signaling, and identifies the second terminal identifier, the first terminal identifier, the channel quality indicator and the re-transmission request information; and the modulation and coding identifier is determined according to the channel quality indicator, and the sub-link data signal is re-transmitted. The mobile communication system includes a base station and at least two terminals. Compared with the prior art, by adopting the scheme of the invention, the transmission reliability can be ensured, the data rate can be increased, and the communication efficiency and security can be improved.

The invention discloses a multi-input multi-output system, a data transmission method and a data transmission device thereof, which are used for improving the throughput of uplink data transmission inthe multi-input multi-output system. The method comprises that: a user terminal side performs corresponding modulation and coding on a data stream to be transmitted according to received modulation and coding scheme MCS information determined by a base station side, and inserts a user dedicated demodulation reference signal into each data stream to be transmitted respectively; downlink channel estimation is performed, and according to downlink channel information obtained by the estimation, eigenvalue decomposition is performed to obtain a corresponding pre-coding matrix which is used as an uplink pre-coding matrix; and the uplink pre-coding matrix is adopted to pre-code the data stream inserted with the user dedicated demodulation reference signal, and then the pre-coded data stream is transmitted to the base station side. The method and the device fully utilize uplink channel state information to obtain the spatial diversity gain of a plurality of antennae and improve the throughputof the uplink data transmission.

The present invention relates to a method of determining a Modulation and Coding Scheme (MCS) feedback in a Wireless Local Area Network (WLAN) system, including an MCS FeedBack (MFB) responder receiving a first frame, including a request message requesting to send the MFB, from an MFB requester and the MFB responder sending the MFB, including a recommended MCS value, to the MFB requester. The recommended MCS value is derived with reference to at least one of unsolicit type information indicative of a type of the MFB, transmit type information indicative of a transmission type of data, coding type information indicative of a coding scheme applied to the data, a group ID indicative of a group of target stations (STAs) to which the data will be transmitted, and MFB bandwidth information indicative of a bandwidth of a channel.

The embodiment of the invention discloses selection method and device of a modulation encoding mode, wherein the method comprises the following steps: selecting object primary transmission block errorrate (IBLER) from a layer-two system level according to the combined gain of a hybrid automatic retransmission request (HARQ); obtaining an SINR adjusted quantity by a signal-to-interference and noise ratio (SINR) correction algorithm according to the object IBLER; utilizing the SINR adjusted quantity to adjust the original SINR to obtain a modified SINR; and selecting a modulation code combination MCS corresponding to an SINR operation interval into which the modified SINR falls. The spectrum effectiveness for receiving a signal can be improved according to the embodiment of the invention.

A power controllable wireless mobile communications system using an adaptive modulation and coding scheme includes a signal-to-noise ratio (SNR) extracting unit which extracts a SNR from a received signal that is processed using a predetermined first modulation and coding scheme; a modulation and coding scheme determining unit which compares the extracted SNR with a first requested SNR for the received signal and determines a second modulation and coding scheme; a power control value determining unit which compares the extracted SNR with a second requested SNR for a signal of the second modulation and coding scheme and determines a power control value; and a signal generating unit which inserts a field indicating the second modulation and coding scheme and a power control command field for the power control value, into data to be transmitted, processes a resulting signal according to the second modulation and coding scheme, and generates a transmission signal.

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 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 level corresponding to a channel scheduled for a UE; and by means of first indication information, notifying the UE of the determined MCS level, so as to indicate to the UE to determine a modulation scheme and code rate for the channel scheduled therefor according to the MCS grade, wherein there are at least corresponding entries of MCS indexes and TBS indexes corresponding to modulation schemes at higher modulation orders than 6 in the first MCS table. The embodiments of the present application introduce a higher-order modulation scheme into an existing LTE/LTE-A system, improving the spectrum efficiency.

The embodiment of the invention discloses a method of reporting feedback information, which comprises the following steps: user equipment UE reports channel quality indicator CQI feedback value to a base station, the CQI feedback value is carried by enhanced specialized transmission channel media access control protocol data unit MAC-i PDU or high speed downlink shared channel specialized physical control channel HS-DPCCH. By the embodiment of the invention and the CQI feedback value carried by MAC-i PDU or HS-DPCCH and reported to the base station by UE, the CQI feedback value can be rapidly and directly reach the base station, thereby saving the processing resources of RNC and transmission resources of IUB port and the base station can timely and accurately determine downlink modulation coding mode and transmitting power according to the CQI feedback value.

The invention discloses an uplink power control method and a system of an LTE (Long Term Evolution) system, wherein the method comprises the following steps: the average interference lower limit M of user equipment on a neighbor area is determined by a base station, the average interference upper limit M' of the user equipment on the neighbor area is allocated by the base station, and then a link loss compensation coefficient beta of the base station is determined according to the average interference upper limit and the average interference lower limit of the user equipment on the neighbor area and the link loss of the user equipment; power authorized delta'TF(i) on a unit resource block when the neighbor area is interfered is computed and considered by the base station according to the link loss compensation coefficient beta, and then resource block number MPUSCH(i) occupied by a physical uplink shared channel (PUSCH) and a modulation coding mode are obtained according to the power authorized delta'TF(i); the difference f(i) of the resource block number, the modulation coding mode, the actual signal to interference and noise ratio and the target signal to interference and noise ratio is issued to the user equipment through uplink authorization, the deltaTF(i) is obtained through computation and lookup by the user equipment according to the resource block number and the modulation coding mode, and then the transmission power is adjusted by the user equipment according to the deltaTF(i), the f(i) and the MPUSCH(i).

Disclosed is a method to operate an orthogonal frequency duplex multiplexing (OFDM) communications system, and an OFDM system that operates in accordance with the method. The method includes, when transmitting data over a plurality of OFDM sub-channels from an OFDM transmitter (12A) to an OFDM receiver (12B) through a channel (24), operating an adaptive learning automaton (50) to adjust values of modulation coding scheme (MCS) switching thresholds so as to maximize at least one selected performance criterion; based on the values of the switching thresholds, selecting a MCS and modulating data with the selected MCS and transmitting the modulated data over at least some of the sub-channels. The method further includes receiving the data at the OFDM receiver and demodulating the received data using a demodulator that corresponds to the selected MCS.

Apparatus, and an associated method, for facilitating transmission of block-formatted data by an EDGE-capable mobile station. When the mobile station is instructed to use an MCS-8 modulation coding scheme, in initial transmission of the data, the mobile station determines the amount of data that is to be transmitted. If only a single RLC block is to be transmitted at MCS-8, MCS-6 is instead utilized. And, padding bytes are added to the MCS-6 data blocks.

An adapting method of channel includes carrying out estimation on state of current channel by user terminal for obtaining CQI data, adjusting CQI data according to preset revision parameter and sending adjusted CQI data to base station, selecting modulation coding mode by base station according to adjusted CQI data and send data to user end. The device used for realizing said method and another adapting method of channel are also disclosed.

A mobile communications system can easily set the optimum threshold for use in selecting a modulation-coding mode depending on a link condition. A selection control unit compares the reception quality of a common pilot signal detected by a mobile station with a plurality of thresholds stored in a threshold table, determines a modulation-coding mode to be selected, and outputs the determination result as a switch instruction. A threshold variable control unit variably controls the threshold level indicating the range of the link quality corresponding to the currently used modulation-coding mode based on the contents of the reception error notification from the mobile station.

The invention discloses a data processing method, a base station and a terminal. The data processing method comprises the steps that: the base station determines to use an unauthorized carrier to carry out data transmission and notifies scheduling information to UE; further, the UE judges that the base station pre-schedules the UE, the UE carries out modulation coding according to the scheduling, and meanwhile, the base station preempts an unauthorized carrier resource; and the UE sends data with modulation coding finished on the preempted unauthorized carrier resource. By adopting the data processing method provided by the technical scheme of the invention, when the base station determines to carry out the data transmission on the unauthorized carrier, and if the unauthorized carrier is not preempted temporarily, when preempting the unauthorized carrier, the UE carries out the modulation coding according to the scheduling, in this way, after the unauthorized carrier resource is preempted, a data transmission process on the unauthorized carrier resource can be carried out immediately or soon, so that the limited occupation time of an unauthorized frequency spectrum is fully used, and the utilization rate of the preempted unauthorized carrier resource is improved.

The invention provides a downlink self-adaptive method; wherein, a resource block group (RBG) corresponding to a sub-band channel quality indicator (CQI) of good quality is used for sending data scheduled to UE. When the RBG corresponding to the sub-band CQI does not meet the requirement of data amount, the RBGs corresponding to the sub-band CQI and a part of broad band CQI are jointly used for sending the data scheduled to the UE; however, when both the RBG corresponding to the sub-bond CQI and the RBG corresponding to the broad band CQI do not meet the requirement of the data amount, the sub-band CQI and all RBGs corresponding to the broad band CQI are used for sending a part of the data scheduled to the UE. Furthermore, when the TBz can be sent by the RBG corresponding to the sub-bond CQI is less than the TBz can be sent by the RBG corresponding to the broad band CQI, the RBG corresponding to the sub-bond CQI is used for sending the data scheduled to the UE. Under the feedback of UE selective sub-band CQI, the method of the invention not only adopts a single code modulation mode for each data stream, but also obtains comparatively high downlink throughput rate.

The invention relates to a selection method of the modulation encoding way for a TD-HSPA+multi-user MIMO system, the selection method comprises the steps of using a base station for comprehensively considering the interferences among multiple users and the influences of signal channel changes between two times of scheduling according to signal channel quality information of a downlink of the previous scheduling fed back by a mobile station, and selecting the modulation encoding way of the current scheduling, thereby increasing the average throughput of the system and improving the first transmission accuracy rate. The base station can significantly upgrade the transmission performance of the system and improve the first transmission accuracy rate and the average throughput of the system by only carrying out pretreatment on SINR before the selection of the modulation encoding way on the basis of not amending the existing communication protocol system and not obviously increasing the complexity of the system and the signaling cost, and the system gains are more obvious in particular to the scenarios of serious interferences among the users and obvious time delay of two times of scheduling.

The invention relates to a building intelligent fitness system, which comprises a radio frequency label, terminal equipment and a network platform; the radio frequency label comprises an antenna and a chip, wherein the antenna is used for receiving electromagnetic waves of a radio frequency identification card reader and returning energy of the chip to the radio frequency identification card reader in an electromagnetic wave way; the chip is used for demodulating and decoding a signal received by the label and modulating and coding the signal needing to be returned by the label; the terminal equipment comprises terminals and a host; the terminals are arranged on the wall surface of a space in a building, and the total amount of the terminals in one building is more than or equal to 2; mutual communication can be carried out between the terminals as well as between the terminals and the host; the host is arranged in the building and is connected with Internet; the network platform comprises an equipment server, a network server and a user client side; and the terminal equipment arranged in all buildings can be connected with the network platform through the Internet.